diesel heater for sailboat

Diesal Heaters for Boats: The Ultimate Guide to Choosing and Installing

Diesel heaters for boats are essential for those looking to extend their sailing seasons into the colder months or simply wanting to maintain a comfortable temperature on board. These heating systems not only serve to keep the interior warm and cozy but also aid in reducing dampness and mold, improving the overall living conditions. With numerous options available, it's crucial to understand the basics and select the most suitable heater for one's specific boat and needs.

In this ultimate guide , we will explore the various types and specifications of diesel heaters, taking into consideration factors such as boat size, heating requirements, layout, and energy efficiency. From compact models like the Eberspacher Espar Airtronic S2 D2 L for boats up to 38 feet  (source)  to more powerful alternatives for larger vessels, there's a heater for every sailor out there.

Apart from discussing the best diesel heaters on the market, this guide will also offer insights into the installation process and share tips on how to maintain and troubleshoot these systems, ensuring a safe and comfortable experience for all boaters. With this knowledge, one will be better equipped to make informed decisions about diesel heaters, gearing up for more enjoyable stays on board in any weather conditions.

Understanding Diesel Heaters for Boats

Components and functioning.

Diesel heaters are designed to provide warmth on a boat, utilizing diesel fuel from the boat's fuel tank. They typically consist of several main components: a combustion chamber, fuel pump, control unit, heat exchanger, air intake, and exhaust pipe. Diesel fuel is mixed with air in the combustion chamber, where it is ignited and generates heat. The heat produced is then transferred to the boat's interior via the heat exchanger.

One key aspect of diesel heaters is their forced air system. This means that a fan pushes air over the heat exchanger, which warms and distributes it throughout the boat. This forced air system allows for efficient and quick heating of the boat's interior, ensuring comfort during cold weather.

Since diesel heaters require fuel, it is important to ensure that the fuel system is functioning properly. This includes having a reliable fuel pump and clean fuel lines. Additionally, the exhaust pipe should be properly insulated and vented to the outside to prevent any dangerous gas buildup within the boat.

Types of Diesel Heaters

There are several major brands of diesel heaters available, such as  Webasto , Eberspacher (also known as Espar), and Chinese diesel heaters. Each of these brands offers a variety of models catering to different boat sizes and requirements.

• Webasto:  A popular choice among boaters, Webasto offers a range of diesel heaters, such as the Air Top EVO 40, which is compact, quiet, and economical. This heater requires 0.18 to 0.43 liters of diesel per hour and is suitable for marine installations in various areas of the boat, including passenger areas and proximity to dangerous substances.
• Eberspacher (Espar):  Eberspacher heaters are well-known for their reliability and performance. They often come with advanced control units, allowing for precise temperature settings and fuel consumption management.
• Chinese Diesel Heaters:  These are more affordable alternatives to the major brands. While they may offer more limited features and may not have the same level of quality control, they can still provide adequate heating for smaller boats or those on a tight budget.

When choosing a diesel heater, it is important to consider the size of your boat and your heating requirements. For example, boats 20 feet or smaller may require a 3-4 kW heater, while those between 21-30 feet may need a 7-9 kW heater. Larger boats (31-42 feet) may require two 9-12 kW heaters, depending on the layout and the number of cabins.

In summary, selecting the appropriate diesel heater for your boat will depend on various factors, such as boat size, heating needs, and brand preference. Regardless of the choice, proper installation and maintenance are crucial to ensure the longevity and efficient functioning of the diesel heater.

Choosing the Right Diesel Heater

Heating capacity.

When selecting a diesel heater for your boat, it's essential to consider the heating capacity needed to maintain a comfortable temperature onboard. The size of your boat and the number of cabins play a significant role in determining the required heating capacity. For boats 20 feet or smaller, a  3-4kw diesel heater  should be sufficient. Boats between 21-30 feet may require a 7-9kw diesel heater, while boats between 31-42 feet could need two 9-12kw diesel heaters.

Fuel Efficiency

Fuel efficiency is a crucial factor in choosing a diesel heater, as it directly impacts the operating costs and overall energy consumption. A fuel-efficient diesel heater should offer high performance and low fuel consumption under various conditions. Comparing the fuel consumption of different heaters based on their specifications can help you make an informed decision.

Size and Weight

Another aspect to consider when selecting a diesel heater is the size and weight of the unit. A compact and lightweight heater is beneficial, especially for smaller boats with limited space. Moreover, a smaller unit is generally easier to install and maintain. Make sure to review the dimensions and weight of different diesel heaters to ensure they would fit well in your boat's allocated space.

Additional Factors

Apart from heating capacity, fuel efficiency, and size, some additional factors to consider include:

• Ease of installation : Look for a diesel heater that can be easily integrated into your boat's existing fuel system, making the installation process more straightforward.
• Reliability : Opt for a heater from a reputable brand known for its build quality, performance, and reliability, such as  Webasto .
• Functionality : Consider a diesel heater with a digital timer that offers instant access to functions and allows for stepless modulation of heating.

By carefully considering these factors, you can find the best diesel heater for your boat.

Installation Process

Tools and equipment.

Before starting the installation process, gather all the necessary tools and equipment. These may include screwdrivers, wrenches, drill bits, a fuel line, insulation, ducting, a mounting plate, a wiring harness, and other relevant items. Ensure everything is ready and close at hand to make the process smooth and efficient.

Location and Mounting

Selecting the right location for your diesel heater is crucial, as it will impact its performance and safety. Choose a well-ventilated area, preferably in the sleeping quarters, as these will be the primary beneficiaries of the heat. Once the location is decided, place the heater on a mounting plate as close to horizontal as possible. This will ensure stability and accessibility.

Fuel and Exhaust System

The fuel system involves connecting the fuel line, fuel filter, and fuel pump. Choose a quality fuel line that's compatible with diesel, and install a fuel filter to prevent any impurities from entering the heater. Install the fuel pump in such a manner that it's as low as possible, allowing gravity to feed fuel to your heater.

Additionally, proper exhaust system setup is essential for heaters' smooth operation. The exhaust pipe must be lagged with insulation and sheathed in protective  ducting . Ensure that the exhaust pipe has a suitable path to the outside of the boat, and always follow the manufacturer's guidelines for proper installation.

Electrical Connections

Connecting the electrical components of the diesel heater is a critical part of the installation process. This includes the wiring harness, control panel, and power connections. Ensure the wiring is run cleanly and securely fastened, avoiding high heat or chafe-prone areas. The air inlet for combustion should pass through a  silencer  to reduce noise during operation.

Once all connections are made, double-check everything for security and proper installation. Following the guidelines mentioned above will ensure a successful and efficient installation of your diesel heater.

Operation and Control

Control system and thermostat.

Modern diesel boat heaters include advanced control systems to help maintain a comfortable cabin temperature. The control system often features a thermostat that continuously monitors the interior temperature, adjusting the heat output according to the pre-set temperature  requirements . A few popular diesel air heaters, like the Eberspacher Espar Airtronic S2 D2 L, come with an EasyStart PRO 7 Day Timer for improved control and convenience.

The thermostat helps maintain a constant temperature inside the boat. Most diesel heaters have an LCD display on their thermostats, making it simple to monitor and adjust the settings as needed. Some models offer a separate, remote thermostat, allowing for more precise temperature control in different sections of the boat.

Timers and Remote Options

Timers and remote control options for diesel boat heaters increase the convenience and efficiency of heating systems. A timer allows users to program the desired heating schedule for the week, activating the heater before occupancy, ensuring the boat is warm when required. The  EasyStart PRO 7 Day Timer  is an example of an advanced timer that offers full control over when the heating system will be active.

Remote control options for diesel air heaters are available in various versions, including wireless and smartphone app-based control. These options allow boat owners to remotely monitor and adjust the heater's settings without being physically present by the control system. As a result, remote control options provide added comfort and control, allowing boat owners to preheat their boats even when they are onshore or away.

In summary, diesel boat heaters with advanced control systems, including thermostats, timers, and remote control options, enhance the user's comfort and make operating the heating system more efficient. By incorporating these features, boat owners can ensure a comfortable cabin temperature while optimizing fuel consumption and reducing emissions.

Safety Precautions

Carbon monoxide monitoring.

It is crucial to install a  carbon monoxide alarm  in any space where a diesel heater is in use. Carbon monoxide is a colorless, odorless gas that can be lethal in high concentrations. Regularly check and maintain the alarm, ensuring it is in proper working condition.

Proper Ventilation and Insulation

Proper ventilation is essential when using a diesel heater on a boat. Ensure adequate  venting and outlets  for fresh air intake and exhaust. Follow the manufacturer's guidelines for safe installation and operation. Insulate the heater and its components to prevent heat loss and improve efficiency, taking care not to obstruct any airflow or ventilation points.

When installing a diesel heater, be sure to place it in a separate locker, away from any cabin space, to reduce the risk of accidents or exposure to dangerous substances. Install your heater as close to horizontal in both planes as possible, as most heaters are designed to work best in this orientation, and place it in a location where it is accessible for regular inspection and maintenance.

Overheating Prevention

Preventing overheating is another essential safety precaution when using a diesel heater on a boat. Ensure that the heater's thermostat is functioning correctly and that its temperature settings are within safe limits. Regularly inspect the heater's components, such as the combustion chamber and exhaust system, for signs of wear or damage that could lead to overheating. Keep any flammable materials or substances away from the heater and avoid overloading the heater with too much fuel or running it continuously for long periods.

Familiarize yourself with the signs of an overheating heater, such as unusually high temperatures or excessive noise, and address any potential issues immediately. By adhering to these safety guidelines and the manufacturer's recommendations, you can ensure the safe and efficient operation of your diesel heater on your boat during cold weather.

Maintenance and Troubleshooting

Routine service and cleaning.

Regular maintenance of diesel heaters for boats is essential to ensure their optimal performance and longevity. It is recommended to check and clean the heater's components every season, especially before winter when you are more likely to rely on it for warmth.

Some important routine service tasks include:

• Inspecting and cleaning the air intake and exhaust systems to remove any debris or buildup that could obstruct air flow
• Checking and replacing fuel filters, as a clogged filter can cause poor combustion and reduce efficiency
• Examining and cleaning the combustion chamber, ensuring there are no signs of wear or damage
• Testing the entire system for leaks, making sure all seals are tight and secure

Remember to follow the manufacturer's specific recommendations for maintaining your diesel heater, as different models and sizes may have unique requirements.

Detecting and Solving Common Problems

Even with regular maintenance, some problems may still occur with your boat's diesel heater. Being able to detect and address these issues can save you time, money, and potentially avoid more significant repairs in the future.

Some common diesel heater problems and their respective solutions include:

• Incomplete or poor combustion : This issue can be caused by a clogged fuel filter, blocked air intake, or insufficient fuel supply. Check and clean the filter, clear any obstructions, and adjust the fuel flow as necessary. A  balanced fuel-to-air mixture  is essential for a clean and efficient burn.
• Lack of heat output : If your heater is not producing the desired heat, it might be due to an issue with the thermostat. To test your thermostat, follow  these steps : Run thread through the valve, and boil it in water until it opens. Replace the thermostat if it is not opening correctly.
• Heater not starting : Problems with the electrical system, such as a dead battery or a malfunctioning ignition, might prevent your heater from starting. Ensure that your boat's battery is charged, and inspect the ignition system for any defects.

Always consult your heater's manual for specific troubleshooting guidance and seek professional assistance if you are unsure of how to proceed with any repairs. Proper maintenance and addressing potential problems promptly will help you enjoy the benefits of your diesel heater for many seasons to come.

Diesel Heater Brands and Providers

There are numerous diesel heater brands available for boats that offer different levels of performance, reliability, and price points. In this section, we'll explore some of the top brands and providers of diesel heaters for boats .

One of the most popular diesel heater brands is  Eberspacher Espar , which offers a range of heaters such as the Airtronic S2 D2 L 12V 2.2kW (7500 BTU) with EasyStart PRO 7 Day Timer. Known for their reliability and efficiency, Eberspacher heaters are ideal for boats up to 38 feet in length.

Another notable brand is  Webasto , which provides a more affordable lineup called the Air Top series. These diesel heaters come with a 3-year warranty and are compatible with diesel, kerosene, and gasoline. They offer various heating power levels suitable for different boat sizes.

In addition to well-known brands, there are reputable providers that offer a wide range of diesel heaters for boats.  Fisheries Supply  is a premier supplier of marine diesel heaters and stoves from top brands, along with necessary dampers and installation parts. They cater to various budgets and boat sizes, making it accessible for boat owners.

Another provider is  Go2marine , which offers a selection of diesel heaters for sale, including products from Dickinson Marine and Lofoten. These heaters come in different sizes and styles, such as floor-mounted and fireplace-style models.

For online shoppers,  Amazon  provides a platform for buying diesel boat heaters from various brands and suppliers, allowing customers to compare prices, read reviews, and choose the best option for their boats.

Here's a summary of diesel heater providers and the heater options they offer:

• Eberspacher Espar: Airtronic series, ideal for boats up to 38 feet
• Webasto: Air Top series, compatible with diesel, kerosene, and gasoline
• Fisheries Supply: Diesel heaters, stoves, dampers, and parts from top brands
• Go2marine: Dickinson Marine, Lofoten floor-mounted and fireplace heaters
• Amazon: A platform for comparison and purchase of various diesel heaters

By exploring these diesel heater brands and providers, boat owners can find the most suitable heating solution for their vessels while considering factors such as reliability, efficiency, compatibility, and price.

The research team at Sea Magazine is constantly doing in-depth research regarding marine technology, products & information we know you will find helpfull!

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A Diesel Heater On Your Boat

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Extend your boating season by installing a diesel heater. Here’s how

Difficulty:

• Drill & assorted bits
• Assorted hole saws
• Assorted wrenches
• Screwdrivers
• Flue piping
• Fuel filter
• Hose clamps

It took me two full days once I gathered everything, but that may vary

Around $1,400

After purchasing my last sailboat, a 1978 Union 36, I was faced with a five-day midwinter trip to relocate her from New Bern, North Carolina, to my slip in Norfolk, Virginia. The day of our departure was an amazingly warm January day, with temperatures reaching almost 70 degrees. I began to believe Old Man Winter was going to give me a pass on this trip. But the following day, temps plummeted into the teens, with howling winds and daytime highs in the mid 30s for the remaining four days.

After battling freezing temps, ice, sleet, and snow along the way, the day I moored up in Norfolk I promised myself I’d install a diesel heater. Here’s a look at how I fulfilled my promise to keep a warm boat while underway and at anchor.

The search heats up

While there are several heater choices available to boat owners, diesel was really the only viable option for my boat. I didn’t have a generator, so electric heat while away from the dock was out of the question. An LPG (liquid petroleum gas) heater was also not an option, as my new boat used CNG (compressed natural gas) for cooking.

During a fit of childhood nostalgia prompted by memories of the old wood stove at my grandpa’s house, I briefly considered a solid fuel heater – i.e., one that could burn kindling, charcoal, peat, or wood pellets. Memories of cleaning ash and the mess it made quickly snapped me out of it.

Diesel remained the best choice, particularly as I could pull from my existing engine fuel tank, eliminating the need to carry solid fuel or install a second fuel system.

After looking at available diesel heater options, I settled on a Dickinson Newport diesel heater ­( dickinsonmarine.com ). It’s a salty, good-looking heater (photo 1), and the window showing a dancing flame seemed just the ticket to stave off those cold winter nights. Well-built and robust, I viewed it as a value-added installation for the boat, both in comfort and resale value.

Is it drafty in here?

Diesel heaters are natural draft appliances, so they require plenty of fresh air. While in operation, the chimney stack creates draft pressure, just like the chimney in a wood stove. The hot air in the chimney pulls fresh air into the heater as it rises up the chimney and exits the flue or exhaust cap.

For the heater to operate properly, there must be sufficient ventilation to replace the air inside your boat at the same rate that the heater is removing it. Doing so allows greater draft pressure (the rate of heated air exiting the chimney). The greater the draft pressure, the better the heater will be able to resist downdrafts (due to strong winds) and overcome venting resistance (such as caused by flue elbows) while providing better, more efficient heating.

Part of any diesel heater installation must also include the installation of marine-grade smoke and carbon monoxide detectors located to monitor the atmosphere in both the main cabin and each sleeping area.

The heater installation instructions called for a permanently open fresh-air inlet into the cabin of at least 3 inches in diameter. As I had four 5-inch dorade vents that would remain open during heater operation, we were good to go from a draft/ventilation standpoint.

Location, location, location

The next step was choosing a place to mount the heater. It had to be a spot that was functional (with regard to heat radiation about the cabin) but also didn’t block the flow of traffic or present a contact safety hazard during operation for those moving about the cabin. Another major consideration was placement of the chimney exhaust cap, as even the best cabin location would be a no-go if these issues couldn’t be addressed. This had to be away from the boom, not interfere with any deck equipment operation (such as mainsail or jib sheet routing) and enough out of the way that it didn’t become an impromptu grab point or handhold to someone working on deck. Installation of the fuel lines was another consideration, but one that was easily solved with proper routing and a few holes.

I finally chose a spot on the forward main cabin bulkhead at the foot of the pilot berth (photo 2). It was an unused spot that worked well for both heat radiation and safety as well as placement of the chimney. Another benefit was that it didn’t reduce any functionality or get in the way of main cabin activities.

Installation instructions called for orienting the heater so that it faced either the bow or stern (particularly on a sailboat), and my location met that requirement.

A final advantage (although certainly not a crucial one) was the ability to view the flame (i.e., viewing the combustion chamber) from most of the main cabin – particularly the aft corner seat of the dinette, which serves as my floating office/writing nook.

The main disadvantage from an installation standpoint was the flue pipe. I’d be unable to meet the minimum recommended 4 feet of flue pipe between heater and chimney (we missed that by about 6 inches). The second was the necessity to use angled elbows to make the heater-to-chimney connection rather than the preferred straight flue-pipe installation. All things considered, however, this location checked the most installation requirement boxes, and I believed any disadvantages could be overcome (or at least mitigated to a tolerable level).

Getting warmer

Now came mounting the heater. Installation instructions require that combustible material closer to the heater than the specified safety clearances be lined with insulation or millboard and a metal liner with a ½-inch standoff for air movement behind. My solution was a thick, trimmed-to-fit piece of stainless-steel (photo 3). To soften the harsh, shiny reflection of the plate, I used a palm sander and 120 grit paper to rough up the outward-facing surface, giving it a nice satin finish.

I found some small ¾-inch aluminum tube sections of the correct diameter to fit the mounting bolts and used them as standoffs. I placed them between the stainless-steel heat shield and bulkhead when bolting the plate into place (photo 4). I also installed stainless-steel washers on the bulkhead end of the standoff to help spread the load and protect the wood when tightening the bolts. This worked so well, I later used the same method to install additional heat shields to a small section of the coach roof outboard of the heater, as well as the side of a nearby support knee facing it (photo 10).

Once the stainless-steel plate was mounted, I drilled holes for the heater mounting feet through both the stainless-steel plate and bulkhead, added standoffs, and securely bolted everything together (photo 5).

Building the chimney

Now that I had the heater mounted, it was time to tackle the chimney stack. As mentioned earlier, a long, straight chimney stack is preferred but, alas, in my installation, it was not to be. I was unable to mount the thru-deck fitting directly above the heater (due to a handrailing), so I had to shift its location about 6 inches inboard. I then had to “Frankenstein” a connection between heater and thru-deck fitting using two 45-degree fittings and three sections of stainless modified chimney pipe.

Snug as a bug

After marking the location, it was time to cut the hole for the deck fitting. Installing the deck fitting requires 1 inch of clearance all around the chimney pipe. As the exhaust pipe for the Newport is 3 inches, this means the deck hole had to be 5 inches to provide the required 1 inch air gap. The simplest way to cut this was using a hole saw. After cutting the hole, I sealed the exposed coring with thickened epoxy to prevent water intrusion into the deck (photo 6). Although probably not necessary, I also installed a ring of tin around the hole to further protect the epoxy sealed coring against heat. The instructions don’t say anything about the need for the extra shielding because as long as you have the recommended air gap and the stack is of the required length, the stack shouldn’t get hot enough to require it. But I added some because I had the leftover tin. And I was a bit concerned as the stack was 6 inches too short, but, again, it probably wasn’t crucial or necessary.

Another issue that needed addressing was the contour, or camber, of the coach roof where I’d be mounting the deck fitting. It wasn’t level, so I fashioned an angled base for the deck fitting out of wood (photo 7). After drilling and dry-fitting the base, I found the angle was a tad off, so I used thickened epoxy to level it up and mount it to the deck (photos 8 & 9).

Once the epoxy hardened, I was able to fit the chimney pipe into place (photo 10). Everything looked like it would work, but I still didn’t like using so many elbows in such a short run. I was at a loss for a better solution, however, so I moved on to plumbing the fuel supply.

Adding fuel

This was the most straightforward part of the heater installation. After my initial reading of the installation instructions, I decided to use my existing diesel tank to provide fuel to the heater. The only “extra” fitting I had in my fuel tank had been used a few years earlier to install a fuel polishing system. (See page 84 to learn more about that.) I decided to “T” into this fitting to simplify things.

I had outfitted this fitting with a pick-up tube that reached within an inch of the tank bottom, so I knew it would be able to provide fuel until the tank was pretty much empty. I believed the diameter of the tube was sufficient to provide fuel to both systems, however, if not, I wouldn’t be polishing fuel while operating the heater anyway. The fuel consumption (per the manufacturer) every 24 hours is 1.3 gallons (low setting) and 3.2 gallons (high setting).

After choosing the best route to run the fuel hose to the heater, I selected a good place to install the in-line filter and heater fuel pump (photo 11), and continued the hose run to the heater.

I then wired the fuel pump to a dedicated on/off switch via an extra breaker at the main DC panel (photo 12). I used a Walbro #20-000 low-pressure pump recommended by Dickinson. The pump will slow almost to a stop when the stove or heater is in use and the pump outflow pressure limit of about 3 psi is reached.

Once this was completed, the only thing left was plumbing the fuel overflow fitting. The Newport heater has an overflow safety feature designed to allow the controlled escape of fuel from the heater in case of overpressurization or minor leaking at the valve due to dirt or debris. If the main tank is used as a fuel supply, the instructions call for installing a fuel line to return the overflow back to the main tank. If a day tank is used, however, the overflow line can be plumbed to a small container located away from the heater.

I didn’t have an extra fitting at the primary tank, so opted to install a small container instead. I repurposed an empty metal paint thinner can for the job, mounting it on the opposite side of the bulkhead and below the heater so any escaping fuel would gravity feed into it (photo 13). The overflow is an emergency system only, and while I never saw any fuel enter the tank, the installation looked professional, and I was confident it would work great should the need ever arise.

Firing it up

Now that I had everything installed, it was time to fire up the heater and give it a test (photo 14). Once the heater was lit, I monitored the temperature of the surrounding wood (and any nearby combustible materials) as it reached operating temperature to verify that nothing got excessively hot.

Everything worked as planned, and I used the heater over the next few months with good results. I still didn’t like the chimney pipe configuration, so I was stoked when I found a neat solution to rectify it. I discovered semi-flexible stainless-steel tubing at a fireplace store that is used inside older chimneys when installing heaters. It was robust-looking and of the proper diameter, so I bought a section and installed it (photos 15 & 16). It fit perfectly, looked great, and has worked flawlessly ever since.

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Frank Lanier

Contributing Editor, BoatUS Magazine

Capt. Frank Lanier is a SAMS-accredited marine surveyor with over 40 years of experience in the marine and diving industries. He’s an author, public speaker, and multiple award-winning journalist whose articles on boat maintenance, repair, and seamanship appear regularly in numerous marine publications worldwide. Contact him via his YouTube channel “Everything Boats with Capt. Frank Lanier” or at captfklanier.com.

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Yachting Monthly

• Digital edition

How to install a diesel heater on your boat

• Theo Stocker
• July 15, 2021

Installed properly, your diesel heater will last for years, but done badly, it could prove fatal. Theo Stocker discovers the difference

Picking the right diesel heater for the size of your boat is the first step. Credit: Theo Stocker

A properly installed diesel forced air heater will keep your boat warm for a long time, with little more than a service every couple of years.

Problems with diesel heaters are most often attributable to how it was installed.

Getting the installation right in the first place is key, therefore.

The exhaust (top) is lagged with insulation and then sheathed in protective ducting. The heater sits on a mounting plate that should be placed as close to horizontal as possible. The air intake (bottom) for combustion passes through a silencer

If you’ve already got heating on board, it’s worth giving it a once over to check that it was put in correctly to start with and that no parts of the system are damaged.

While a crushed vent might reduce the efficiency of your heating, a damaged exhaust could produce fatal carbon monoxide or pose a fire risk.

For those who don’t have heating, carefully planning how you would fit it is the first step.

Choosing the right diesel heater

Getting the right unit will be crucial for the long-term performance of your heating.

A unit that isn’t big enough for your boat will constantly be running at full capacity and will drain power, while a unit that is too big will be in idle much of the time and risks sooting up as a diesel engine would.

Continues below…

Best diesel heaters for boats – An expert buyer’s guide

Planning on extending your sailing season? Duncan Kent investigates diesel forced air heaters and finds out what is available on…

Eberspacher S2 D2L diesel heater: tested

Theo Stocker turns up the heat with a test of one of the new generation diesel heaters - the Eberspacher…

A 2kW heater is sufficient for up to four outlets on boats up to 34ft, while a 4kW heater will be suitable for boats of up to 40ft or more, depending on how many areas you want to heat.

You also have the option of installing more than one smaller heater, so you can have separate heating for different areas of the boat, which may be a more efficient solution.

For this installation on a Sadler 29 , an Eberspacher 2kW unit with two vents was plenty.

Locating the heater

The heater cannot be in any cabin space and must be in a separate locker, and depending on the make, should be fitted as close to horizontal in both planes as possible.

These requirements mean that the majority of heaters, as on this boat, are fitted in a cockpit locker, tucked up out of the way.

If you store lines and fenders in here, make sure they don’t rest on the system, though the exhaust should be lagged for its whole length.

Routing the ducting

The ducting leads the hot air around the boat and will lose some heat as it does so.

This isn’t significant where the ducting runs straight, and some residual warmth can help to keep lockers warm and dry, but on long runs or sharp corners, heat lost will be greater, making the heater work harder.

Fitting the ducting: Clip the ducting up out of the way. If it is at the bottom of a locked it is liable to be crushed. Credit: Theo Stocker

Ducting runs should therefore be as simple and as short as possible, and where sharp corners are unavoidable they should be properly insulated with lagging.

The fixed vent (which avoids the system overheating) on this boat was placed in the saloon by the base of the chart table, and the closing vent forward in the heads where the heat could be directed through to the forward cabin, or to the wet locker.

The correct vent: At least one vent must be fixed open to prevent the diesel heater from overheating. Credit: Theo Stocker

With the heater in the cockpit locker port aft, the ducting was routed along the engine bay, under the starboard quarter berth and then forward under the chart table into the locker below the starboard saloon berth, where the ducting was split with a Y connector.

Connecting it up

Power and fuel supply should be fairly straightforward on most boats as the batteries and fuel tank are usually close to the engine bay.

The exhaust outlet must be at least 300mm above the waterline; the higher the better, as long as there is still space for a swan neck in the exhaust to stop water backflow in rough conditions.

Fuel shut-off valve: The fuel line should have a shut-off valve at the top of the lift pipe. Credit: Theo Stocker

You then also need to think about where fuel, power and air ducting will be routed. the fuel pump needs to be within 2m of the fuel tank and within 4m of the heater, and it also needs to be fitted at between 15° and 30°, which helps prevent air locks.

Adding the fuel lift pipe to the tank, including a shut-off valve, required carefully drilling a hole into the metal tank.

This was done with a vacuum cleaner next to the drill bit to prevent debris entering the tank. the pump has its own small filter, and shouldn’t have an additional in-line filter as this can provide too much resistance to the pump.

Control system

The control unit can be located wherever it is most convenient, limited only by the length of the cable, though some wireless control units are available.

Connecting the controller: If the temperature reading is a little bit out, you can set an offset if necessary. Credit: Theo Stocker

Either way, the diesel heater should be within the area that is being heated, but not next to an outlet as this will affect the thermostat. if there is no other option, an external thermostat can be added.

Cutting the holes

Having the right tools for the job will make installation much easier and neater.

If you are having a professional installation, their experience will pay dividends here, but it’s worth asking if they have done a fitting on your type of boat before.

Exhaust safety: The double-walled skin fitting must be at least 30cm above the waterline and should vent well away from the air intake. Credit: Theo Stocker

Most ducting is a standard size, but check requirements for your system. this ducting required a 67mm (2 5/8ths in) hole saw, and the exhaust skin fitting needed a 38mm (1 1⁄2 in) hole saw, which was cut angled upwards, using the stainless skin fitting as a guide, before being fitting with plenty of sealant.

The only issue encountered was discovering some hidden cable ducting glassed into the forward bulkhead, so having a wiring diagram of your boat before you start is a good idea.

Insulation and running up

Thanks to David Cousins at Krueger Ltd, which are Eberspacher main dealers. www.krueger.co.uk

The only sharp corners that were unavoidable were under the quarter berth and again as it went through the forward bulkhead into the hanging locker, so both of these were insulated with lagging.

One area of ducting was also unavoidably exposed below the chart table, so a hardwood box was built to protect it.

Covers were screwed over the ducting apertures and the system was ready to use.

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I PLANAR DISTRIBUTION LTD.

Planar Distribution Ltd. is the exclusive North American distributor of the diesel-fired autonomous heating systems AUTOTERM designed and assembled by the company Autoterm (Latvia).

Planar Distribution Ltd. has been in business since 2013, serving our dealers and customers in Canada and the United States. We offer several models of forced air diesel heaters ranging from 6,800 to 27,000 BTU and pre-start engine heaters of 17,000 – 50,000 BTU. Besides the AUTOTERM product line, we offer various heating system components and parts for marine and vehicle applications, spare parts, installation equipment, technical support and training. As an official AUTOTERM distributor, we have constant direct contact with the manufacturer. That allows us to provide up-to-date technical information and support to all our partners and to address their feedback to the Autoterm engineering team.

Dear partners and customers, we announce the beginning of the product rebranding process. The decision for such a big change was made by the manufacturer in order to protect the products from counterfeit and unauthorized sales. The new brand name AUTOTERM will replace the existing product lines PLANAR and BINAR without actual technical changes to the products. During a transition time, the heaters will be sold under both brand names to avoid confusion and to maintain PLANAR product recognition in the North American marketplace.

The heaters AUTOTERM will be sold through the authorized dealer network and will be provided with technical support from local authorized dealers. For more information, please visit our website or contact us with any questions or concerns:

Ph: 1 (604) 372-3222 E: [email protected]

Practical Boat Owner

• Digital edition

Best boat heaters – diesel, solid fuel or warm air central heating?

• Rupert Holmes
• January 20, 2021

Choosing the best boat heater depends on a number of factors, explains Rupert Holmes, and you should also have a marine-compliant carbon monoxide detector

Diesel fuelled heating systems

Having a warm boat can significantly lengthen the sailing season, but the best boat heater for you depends on budget, the size of your boat, and whether or not you wish to install it yourself. In many cases fitting a commercially produced heating system can now be less expensive than it has been for decades. Part of the reason for this are the Autoterm diesel fuelled heating systems that sell for a fraction of the price of more established brands. And there are even cheaper unbranded heaters available online, though these rarely have type approval that’s valid in the UK or the EU, which makes installing one a risk that may not be covered by insurance. At the top end of the market the very best units have become even more efficient and quiet.

Solid fuel heaters

In my view, however, the first step in fitting heating is to consider whether a basic solid fuel unit might be all that’s required. I have a very simple charcoal heater on Ammos , my 30ft Discovery 3000 in Greece. It’s certainly not as convenient as a more sophisticated warm air type system, but took only two hours to fit, needs next to no maintenance and a €5 bag of lumpwood charcoal lasts the best part of a week in the depths of winter. On the downside it takes around half an hour to warm up, so a cold morning necessitates lighting the heater, then going back to bed to read the news. And enough fuel for extended periods is bulky and difficult to stow. The UK-built type I have is no longer produced, but the Newport Dickinson range offers good alternatives at reasonable prices.

A simple charcoal heater is quick to fit and can transform life on board

Multifuel stoves can also be good in larger boats, but the advantage of a charcoal heater is the compact flue – with a diameter of around 11∕2in (4cm) this is easier to fit and far more compact than the 4in (10cm) flue needed for burning wood.

Paraffin heaters

Paraffin heaters and drip-fed diesel stoves are less common these days, but are more convenient than solid fuel stoves as the fuel has a much higher energy density, making it easier to stow. It has to be remembered that every appliance that burns fuel is potentially lethal. By opting for a properly installed, type-approved product you minimise the chances of death through carbon monoxide poisoning.

Carbon monoxide alarm

Any heater that burns fuel, whether diesel, gas, timber or charcoal, has the potential to emit carbon monoxide, a clear and odourless gas that can kill. It’s therefore important to fit carbon monoxide alarms. Domestic models are not recommended – look for units that conform to the EN 50291-2:2010 safety standard and are specified as suitable for marine use (the standard also covers caravans and motorhomes). My preference is an alarm that also has a digital read-out, as levels can be monitored before the alarm is triggered.

Buy a Kidde boat-compliant carbon monoxide alarm on Amazon (UK)

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Warm air central heating.

A key advantage of warm air central heating type systems is they’re quick to warm up and can also be fitted with a timer, or remote control, for automated operation. The price gap for these systems compared to solid fuel has reduced, but disadvantages include the time needed for installation and their consumption of electricity. If doing the installation yourself, plan exactly where every element of the system needs to be located, then allow a full weekend with a helper for fitting. Newer models are much more efficient in their use of electricity, especially the latest units from Eberspächer, than those of two or three decades ago and are also quieter in operation. We also have more forms of generating power than 30 years ago and my experience on the south coast of the UK consistently says a 100W solar panel will usually cover the electrical requirements of a 4kW unit for two or three days a week, even in the depths of winter.

Buy a 100W solar panel on Amazon (UK)

Reliability has also been a long-running worry for many, but this shouldn’t be a concern for carefully installed systems maintained according to manufacturers’ schedules. It’s worth noting that many problems are associated with a build-up of carbon at the business end of the unit. As this is accelerated when the device is running at low power it’s often worth resisting the temptation to fit an over-sized device – a smaller one that’s run hard may be a better long-term option.

Reliability problems can also stem from wiring. A couple of years after installation the heater on Zest, my partner’s 36ft-footer, became difficult to start up. When trouble-shooting we measured the voltage at the unit – despite the 4m wiring run being within specification, there was a 1.5V drop over the length of the wires. Replacing this with oversized wiring two sizes larger solved the issue at a stroke.

Spending time on board out of season means condensation can be as big a problem as keeping warm. If only the saloon is heated, warm, moist air that escapes into cold cabins, heads compartments and lockers will create large amounts of condensation in these areas.

Ensuring heat can reach as many parts of the interior of the boat as possible is therefore important and confers a clear advantage to systems that duct heat to every area on board. Beyond that, either good ventilation or a dehumidifier is important to keep condensation at bay.

• How to check your rig while the mast is down over winter
• Winter lay-up check list
• Lay-up or sail away? Ideas for enjoying winter afloat

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• Cooking, Cooling, Heating
• Diesel Heaters

Diesel Heaters for Boats

Top offers, limited quantities in diesel heaters show.

Best ratings

„We purchased this heater to replace our Eberspacher D3L after we found that we could no longer get support or spares. The Autoterm has fantastic reviews, warranty and competitive price. We are extremely satisfied with this product.“

„When cruising the Irish coast in damp and cold weather the heater is a great comfort.“

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Diesel heaters for the boat

- Heat up properly on board -

How does a diesel hot air heating system work?

A warm air heating system for boats heats air from outside or from the interior of the boat via a heat exchanger and uses a powerful electric fan to circulate that hot air around the boat through ducting (diameter 60 - 100 mm). Anyone who frequently uses the hot air heating on board or lives on the boat should think about insulating hot air ducting to prevent energy loss and reduce fuel consumption. The desired temperature can be set via a control unit, e.g. in the saloon, and is regulated by a thermostat.

For which boats is a diesel warm air heater suitable?

In heated cabins, the hot air flow is regulated via flaps on the hot air outlets. Since individual outlets can have an effect on each other and the air flow in other cabins will automatically change as soon as an outlet is closed in one cabin, diesel warm-air heaters should only be used for boats where up to three rooms are heated.

Is it better to heat fresh air from outside or recirculate interior air when using a diesel heater on the boat?

With many warm-air heaters for boats, you can choose to use circulating air or outside air, just as you can with a car. In recirculation mode, indoor air is drawn in and heated. This uses less energy to maintain the room temperature. Outside air, on the other hand, contains less moisture than the air inside the boat. Outdoor air mode thus also serves to dehumidify.

Diesel heating for yachts - Advantages

Diesel warm air heaters are installed on many boats, as the fuel needed to operate them is already on board and in sufficient quantity. Diesel is pumped out of the tank for use. Diesel hot air heaters with 2,000-3,000 watts of heating power are particularly popular and are used on 6 to 10 metre long boats. A diesel heater warms the inside of the boat very quickly to the desired temperature, keeping the interior of your boat hale and hearty. The fan is powered by the boat batteries. Fuel consumption is 0.12-0.24 litres/hour, depending on the diesel heater, and electricity consumption is 15-40 watts.

Autoterm air diesel heaters for boats

Autoterm's diesel heaters come from Russia. They are simple systems that are very easy to install. Cable harnesses are included to make installation child's play. These heaters do not often malfunction, are inexpensive and compact.

An Autoterm heater is technically similar to an Air Top heater from Webasto. Both diesel heaters have the same type of construction. The mounting flange on the underside of both heaters, where the fresh air and exhaust air ducts are connected and the diesel line is also connected, is identical. They also operate in a similar way: a fan draws in the air to be heated. Behind this there is a control board and an air-heat exchanger made of cast aluminium with an integrated combustion chamber. Inside the combustion chamber is a glow plug. The surrounding fins give off as much heat as possible to the passing air.

The differences between the two heaters are in the details. For example, the electronics of the Autoterm Air are not protected. Therefore, installation in a place with a lot of salty, humid air should be avoided. The control panel of the Autoterm Air only supports English or Russian language.

On the other hand, the cost of an Autoterm Air heater is much lower and they come with a good accessories package, which includes an extraction nozzle. This allows a canister to be converted into a diesel storage tank. The only additional item that has to be purchased is the exhaust outlet for the boat's heating system.

Wallas Viking Air Diesel Heater

The Wallas Viking Air heater comes from Finland. It sets the standard in terms of quality of workmanship and possible usage options, which also includes connecting to a water pump for hot water. The control panel features a colour display and it is also possible to control your boat heating via your smartphone. The Viking features a 9 kg heating unit, to which all connections are made. The diesel pump and exhaust silencer are integrated into the aluminium housing and are completely silent. A brushless fan motor also ensures quiet operation. The smaller the boat, the more important this feature is.

The Wallas heater has two outlets for hot air. Exhaust gases escape through a wall or ceiling vent. The marine diesel heater can be controlled via an app. The control unit is wired. Power and diesel consumption is relatively high.

Purchase price is a reflection of the care taken in the workmanship, as Wallas is guided in its production by automotive standards. The Viking Air is virtually indestructible, with all components made of stainless steel and aluminium, and all plug connections made with industrial connectors.

Webasto Airtop 2000 STC

The Webasto Air Top Heater 2000 STC comes with a cable harness for easy installation. Detailed instructions also make the Webasto warm air heater ideal for do-it-yourself installation. Stainless steel through hull flue gaskets are also included. All electronics and plug-in connections of the Webasto diesel heater are splash-proof. Purchase price is justified by good temperature control and heat output, making the heater very economical.

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Scan marine equipment is the exclusive usa authorized importer for wallas heating & cooking systems , scan marine equipment, maximum power. minimum energy. optimal comfort..

Includes: Nordic Dt diesel stove/heater, mounting hardware and bracket, 13′ fused power harness, 13′ fuel line and filter, and PI control panel with 9′ harness

Wallas Nordic Dt Diesel Stove/Heater with Control Panel

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MARINE HEATERS

Wallas marine heaters provide quiet, variable power for precise comfort control and unmatched adaptability.

Diesel heaters are some of the safest, most convenient heating options for cold, off-grid environments. Diesel is available virtually everywhere, and the ability to draw fuel from the main fuel tank of the vessel or vehicle is a big advantage. Diesel is also more resilient in cold temperatures than for example propane.

The Combustion System Simplified

Wallas diesel heaters produce heat by a laminar combustion process, which requires air, fuel, and a glow plug for the ignition. Combustion air is drawn in via inlet hose with a combustion fan. The highly precise dosing fuel pump delivers fuel to the burner from a diesel tank, glow plug switches on, air-diesel mixture ignites and creates combustion. This whole process takes place inside a closed chamber, meaning no exposed flame. In the chamber, the fuel vaporizes before ignition, resulting in nearly 100% combustion, making this technology one of the most environmentally friendly options for off-grid heating. The process produces quiet, clean, dry heat, that is blown into the indoor space via warm air ducting.

Materials for Challenging Weather Conditions

The rugged outer case design protects the internal components from damage. Wallas heaters are made of stainless steel, high-grade aluminum, and other corrosion-resistant materials to endure challenging weather and marine conditions. The outer case does not get excessively hot, but is comfortable to touch. This provides the option to install the heater in the cabin, where competitors’ heaters are not welcome due to too high surface temperatures.

Wallas-Marin develops products that run best with current road and boat diesel, as well as renewable fossil-free diesel types (HVO), which are some of the cleanest fuels available.

Multiple   inlets take fresh air from outside and heated return air from the cabin. This improves efficiency and ensures oxygen rich air in the cabin.

Multiple outlets reduce air drag and keep the sound level low. They also reduce power consumption and facilitate smooth distribution of heated air throughout the cabin.

Multiple Inlets and Outlets Improve Airflow, Flexibility, and Efficiency

Diesel heaters’ inlet air can be taken from inside the cabin or outside. If air is taken from the inside, it takes less time to heat the air as this return air is already warmer than outside air, but the heater basically circulates the same stale and possibly damp air in the cabin. If air is taken from outside, it may take a bit longer to warm up, but outside air is always fresher.

Wallas marine heaters do both – take inlet air from outside the boat and recirculated heated air from the cabin. This mix improves efficiency and ensures oxygen rich air in the cabin. Wallas heaters also have unmatched adaptability with multiple outlets for the warm air, reducing air drag and keeping sound levels low.

Multiple ducts reduce power consumption and facilitate smooth distribution of heated air throughout the cabin. The bigger the cross-sectional area of the ducts are, the less it reduces airflow and makes the best use of the ventilation fan.

Wallas heaters take the combustion air through the outer coaxial pipe and force exhaust out through the inner coaxial pipe. This reduces the temperature on the surface of the pipe keeping other surrounding materials safer.

This process also improves efficiency, wind resistance, and lowers the power level.

The Greenboost Burner Burns Fuel Slowly Resulting in a Clean Burning Process and More Efficient Power

The Wallas combustion chamber is the most efficient in its class. The aerosols of diesel are burnt in a safe enclosed chamber with a burn process that is virtually silent. The fully enclosed burn process doesn’t leak fumes or combustion odors and all of the exhaust gas is vented outside, keeping the indoor air always fresh.

Wallas Greenboost burner is unique as it has been calibrated to burn fuel as slowly as possible, which results in very low fuel consumption and emissions without reducing heating power. The fuel pump rate is matched perfectly to the combustion air, providing a very clean and efficient burn of diesel. The recently updated burner software also minimizes 12VDC electricity consumption allowing boaters to use the heater for long periods of time without concerns about depleting the battery.

Open and closable air vents can be installed in the indoor space or on the deck for maximum comfort.

Brushless blower motors have a very long life-cycle, supporting reliably long service intervals

Wallas heaters are built with brushless blower motors with variable speed. Picture a single-speed system which runs at full capacity, then stops when the temperature reaches the set level in the thermostat, only until the temperature drops and the motor cycles back on at full speed. This kind of constant starts and stops waste a tremendous amount of energy. Variable speed system in Wallas heaters, on the other hand, can operate at high speeds or low speeds and adjusts the speed gradually to the required level to maintain a stable temperature. Even though the variable-speed motor is basically always running, it is more energy efficient, because it runs mostly at lower speeds maintaining the temperature rather than frequently starting at full power.

Distinctive to Wallas, there are two independent, brushless, ball-bearing, highly durable and long-lasting fan motors. The combustion fan, controlled by the electronics, optimizes a precise burning process, while the main blower transfers the heat to the cabin. Competitive products have only one motor with the combustion fan and the main blower on the same shaft. In these devices, the heat output cannot be adjusted without compromising the fuel-air mixture and their ventilation fan does not always follow the power variations of the device. This feature makes Wallas heaters more versatile for different sizes of boats. The big advantage is there is no need to be extremely precise about the size of the heater, because the power output can be adjusted; especially in the newer Viking and Spartan models.

Brushless motors are considerably more durable, yet quieter than brushed motors. They have a longer life-cycle, thus requiring less frequent servicing.

12 V Battery as a Power Source

Wallas heaters need a 12 V battery to operate, but they use a very low amount of power. Starting current will typically drop to 7-9 amps and then settle to 8-10 amps, which can drop the available voltage momentarily. Once the device is running, it will continue to run on a battery, but with a voltage well below 12 V, amps typically ranging between 0.5-4.5. Low voltage technology ensures that the heater will start even with compromised charging and lower battery levels.

Wireless Temperature Sensor Maintains a Smooth Ambient Temperature

Wallas heaters have either a wired or wired+wireless temperature sensors, which maintain a smooth ambient temperature in the space. The wireless sensor in the newer Wallas models is a convenient tool to accurately measure room temperature. As it is detachable, it can be moved to different areas of the boat.

Thermo Control Panels Give More Options to the Boater

Wallas currently has two control panels; the PI Thermo Control Panel and the Advanced Control Panel depending on the heater model. They both give the option to heat air in the Thermo Control Mode (set a desired target temperature) or in the Manual Mode (control heating power manually). Additionally, the ventilation volume in Air Boost Mode provides extremely fast defrosting and drying. Ventilation Mode can be used to blow fresh air, when heating is not needed. Both control panels can be accessed remotely, which allows the boaters to start the heater from distance and enjoy a warm boat upon arriving at the marina. The control panel is installed in an area, where it is easy to reach and read. However, Wallas Remote app paired with the Advanced Control Panel is a convenient alternative heater control as it allows the boaters to adjust the heat from their phone without having to reach to the control panel at all.

The Advanced Control Panel enables intelligent temperature control and system diagnostics.

WALLAS IS DIFFERENT

• Multiple inlets and outlets improve airflow and efficiency.
• Variable output eliminates system cycling and reduces noise.
• Two independent highly durable and long-lasting fan motors for improved performance.
• Low temperature on unit and exhaust pipe improves everyone’s safety.
• Wallas Viking and Spartan Series heaters and all stoves and ovens are also E mark approved for vehicles.
• Wallas thermo control maintains an accurate temperature level to keep the whole crew comfortable.
• Wallas marine heaters are remotely controllable from your home sofa, so you can arrive at a warm boat.
• Low voltage technology ensures that the heater will start even with compromised charging and lower battery levels.

Wallas-Marin Oy Kärrykatu 4 20780 Kaarina Finland [email protected]

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SILVEL 5KW-8KW Diesel Air Heater,Diesel Heater All in One 12V with LCD Display, Wheels, Remote Control,Silencer, Fast Heating,for RV Truck, Boat, Camper, Car Trailer, Motorhomes, Caravans

Purchase options and add-ons

• 【Rapid & Efficient Heating】Constructed with a unified body of aluminum components including the combustion chamber, base, and heat dissipation area, our diesel heater offers swift heating and efficient heat distribution, promising longevity in performance.
• 【Constant temperature】Our air diesel heater is fitted with an intelligent sensor that prevents it from running dry and maintains a steady temperature, ensuring smooth, automatic room temperature control with temperature pre-setting features.
• 【Low Noise】Equipped with a silent fan and an oil pump featuring an improved low-frequency pulse for reduced vibration, our diesel heater operates with minimum noise, ensuring a peaceful environment.
• 【Widely used】Portable and compact, our diesel air heater is versatile enough to be used in various settings including cars, trucks, caravans, boats and other cab heating needs. An excellent heating solution for caravans and camper.
• 【Easy installation】The diesel parking heater's oil tank, heater, and fuel pump come as all-in-one, making installation incredibly convenient. The heater can be flexibly mounted on the bottom of a cabin, trunk, or container.

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Product Description

Product information

Technical details.

Manufacturer	‎SILVEL
Brand	‎SILVEL
Model	‎KF370055-01
Item Weight	‎25.4 pounds
Package Dimensions	‎18.8 x 14.8 x 12.2 inches
Country of Origin	‎China
Item model number	‎KF370055-01
Exterior	‎Heating
Manufacturer Part Number	‎KF370055-01
Heated	‎Radiant
Special Features	‎Fast Heating

Additional Information

ASIN	B0CLG8R7LN
Customer Reviews	4.0 out of 5 stars
Best Sellers Rank	#8,995 in Automotive ( ) #2 in
Date First Available	October 20, 2023

Warranty & Support

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What's in the box

• Diesel Heater

Compare with similar items

Price	-20% $71.92$71.92 Typical: $89.90	$119.90$119.90	-21% $109.90$109.90 List: $139.90	$119.99$119.99	$129.99$129.99	-10% $71.92$71.92 Typical: $79.90
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Customer Ratings	1,016	1,016	1,016	1,112	122	1,016
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Customer reviews.

• 5 star 4 star 3 star 2 star 1 star 5 star 59% 16% 6% 4% 15% 59%
• 5 star 4 star 3 star 2 star 1 star 4 star 59% 16% 6% 4% 15% 16%
• 5 star 4 star 3 star 2 star 1 star 3 star 59% 16% 6% 4% 15% 6%
• 5 star 4 star 3 star 2 star 1 star 2 star 59% 16% 6% 4% 15% 4%
• 5 star 4 star 3 star 2 star 1 star 1 star 59% 16% 6% 4% 15% 15%

Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.

To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.

Customers say

Customers like the portability and efficiency of the heater. For example, they mention it's very compact and doesn't waste space. They appreciate the quality, saying it'll keep the hard chill off the cabin. However, some complain about the shut off issues. Opinions are mixed on noise and ease of installation.

AI-generated from the text of customer reviews

Customers like the performance of the auto part. For example, they mention it works reliably, is efficient, and effective. Some say the remote control works great and is extremely useful.

"...power.. comes with a super handy remote which I use constantly; extremely useful and convenient. I Originally purchased it for heat near the pool...." Read more

"...The remote is pretty handy! And it works very well . With the doors closed it still works from about 25' away from the trailer...." Read more

"...receiving the heater I found the instruction's SUCK and did not use them at all ...." Read more

"...(Yes I have the same model (8kW). So far this heater is working great ...." Read more

Customers like the quality of the auto part. For example, they mention the heat that this unit puts off is amazing, it keeps the hard chill off the cabin, and it has freed up all the power they need. Some appreciate the quiet operation and the cool down cycle. Overall, most are happy with the product's performance and recommend it to others.

"...it was more then ample to putz around the garage and very comfortable at the work bench which is next to the heater area...." Read more

"...The heat that this unit puts off is amazing and being only 12v, it has freed up all the power we were using with the electric heaters that was..." Read more

"...I'd say the heat output is good , closer to the vent or end of tubing, the better. I wouldn't say it's 5 stars, but close...." Read more

"...It has actual automotive style fuel hose, not the cheap rubber hoses . I got mine set up in about 15 minutes and the unit started right away...." Read more

Customers are satisfied with the efficiency of the auto part. They mention that it is very fuel efficient, and works perfectly out of the box. It also slows down on fuel consumption, and is the most efficient heater. Some say that it frees up all the power they were using.

"...that this unit puts off is amazing and being only 12v, it has freed up all the power we were using with the electric heaters that was consuming most..." Read more

"...It started making heat way before that. Sips the fuel . I can run it all day and I can’t see where it’s used much...." Read more

"...Pros: Great on fuel usage . I have run it for about 4 hours on the highest setting and used about 1/2 gallon of diesel...." Read more

"...It sips fuel on low but gets thirsty on high. Unit is made well enough especially for the price. I'd rate higher but haven't had it long enough yet...." Read more

Customers like the portability of the auto part. For example, they say it's very compact, doesn't waste space, and is great for a small space. Some mention it'd be great for small shops and that it'll be lightweight.

"This heater is a nice compact heater with a decent heat output. The instruction manual is what you would expect from a Chinese vendor...." Read more

"...I grabbed this heater cuz it was inexpensive, portable and had decent reviews. Well, it works well!!!..." Read more

"...Cons: It's a little heavy , so you'll need a sled with all your gear. Also it requires a 12v battery...." Read more

"...Not only was it lighter and ready to go but it was actually hotter and quieter. It is extremely quiet and really puts out the heat!..." Read more

Customers are mixed about the ease of installation. Some mention it's very easy to setup and operate, and the start up is dead simple with the remote. However, others say the instructions are difficult to understand and the manual does not even show installation instructions in an easy to understand method.

"...a super handy remote which I use constantly; extremely useful and convenient . I Originally purchased it for heat near the pool...." Read more

"...well after receiving the heater I found the instruction's SUCK and did not use them at all ...." Read more

"... Set up was pretty self explanatory . Needed to prime the fuel line a little when firing it up for the first time...." Read more

"... Assembly was totally easy , YouTube guys say directions aren’t much help...." Read more

Customers have mixed opinions about the noise level of the auto part. Some mention that it's the quietest of them all, while others say that it makes a clicking sound when running.

"...it's not loud in my book and it puts out some heat. it would work better in a insulated space...." Read more

"...It's definitely not as quiet as I hoped , fan on High at least! Overall I'm happy with it after the first time using it.*Update*...." Read more

"... Sound is acceptably quiet now. Exhaust mufflers are available, but I don't think they will help with the ticking sound of the fuel pump...." Read more

"...It's a little louder than other heaters , but it didn't bother me, it sounded like warmth!..." Read more

Customers are dissatisfied with the smell of the auto part. They mention that it has a smoke burn smell for the first few hours, has the smell like burning rubber or plastic, and starts puking black smoke when on mid to high heat.

"...I think I’ll be toasty warm this winter camping. Stinks like burnt rubber for a good while when you first start it up...." Read more

"...said - "Dear customer， regarding the issue of smell, the burning smell will be emitted during the combustion of diesel fuel...." Read more

"...I adjusted the levels, the black smoke diminished so did the rumble for a while the heat diminished a little. I'll figure it out." Read more

"...second firing of the unit was much better, no smell , and I let it run for about 1 hour on its own while I went in the main house...." Read more

Customers are dissatisfied with the shut off of the auto part. They mention that it starts to shut down, blow white smoke, and give Error code 8 and 10. Some say that the heater randomly shuts off after a couple months of use and starts bellowing white smoke.

"...Update: well after 2 burn cycles, the unit shut down and now just blowing white smoke. No matter what I do it will not ignite again...." Read more

"...and cleaned it and it started to work good again but now it likes to shut off now and then" Read more

"...I had a fuel code. Smokes like crazy and stops running every 5 minutes . And the remote didn't even work. They had to refund my money" Read more

"...After running it for a couple hours, it shut down and gave me an error code. After looking at it, I assumed it was in need of a new part...." Read more

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