RV Diesel Heater: A Great Option For Staying Warm in Your RV This Winter!

For RVers who enjoy camping in cold weather, having the means to stay warm and comfortable in your RV is essential. For many years now, we’ve discussed various methods for heating your RV in winter or at high altitudes (which can be chilly in all seasons). For instance, our post on RV heating pros and cons covered various methods of staying warm in your RV and even offered an RVgeeks video in which we discussed electric space heaters, propane heaters, heat pumps, and more. But this is the first time we’ve presented a post exclusively on the option of diesel heaters. And as it turns out, it’s a pretty hot great option.

So, let’s take a look at what a diesel heater is, the pros and cons of having one, and what to look for if you’re considering installing a diesel heater.

What Is a Diesel Heater For an RV?

A diesel air heater burns diesel fuel to heat the air, which then moves through a heat exchanger to distribute the warm air throughout your RV. Unlike a propane heater, which requires a spark to ignite the fuel, a diesel heater uses compression, thus eliminating the need for a spark. This is significant for a couple of reasons:

• First, it’s more fuel efficient, making it suitable for longer operating times. This is why many commercial trucks and buses have diesel parking heaters, for example.
• Second, it’s power efficient, since the compression is able to be driven solely by 12V DC power.

How Does a Diesel Heater Work?

A diesel heater has a combustion chamber, like all diesel engines do. Air compresses until the temperature reaches around 550 degrees. Here, the diesel fuel is injected into the combustion chamber, where the high heat causes the fuel to ignite.

What Are the Benefits of a Diesel Heater for an RV?

As with anything else, there are pros and cons to using a diesel heater in an RV. Let’s take a look at the advantages of diesel heaters.

Safer than Propane Heaters

Because diesel heaters don’t require a spark for ignition, they’re safer overall than propane heaters. In the event of a diesel leak, it would be unlikely to ignite a fire outside the compression chamber.

Additional Safety Features

These heaters are quite safe to operate and usually have some safety features including auto shut-off. This shuts down the system if the temperature gets too high or if the heater should fall over.

Produces Less Carbon Monoxide

Diesel heaters release less carbon monoxide than propane heaters do (though the exhaust from diesel heaters should still be vented to the outside). Remember that compression is what ignites the diesel fuel. The compression chamber is sealed, and exhaust is vented to the outside, so carbon monoxide isn’t introduced into the interior of the RV, as would happen with a propane space heater.

Heat Quickly

A diesel heater is fast heating. The air warms quickly. To circulate the warm air, the heater relies on an internal fan. That fan pulls in air from inside the RV and then circulates it around the heat exchanger. The warm air is then blown into the RV’s living space.

Fuel Efficient

Diesel heaters are said to be 90% fuel-efficient which is excellent.

Less Off-Gassing

There is little off-gassing with a diesel heater so there is little concern regarding indoor use or use in small spaces like RVs.

Use Only 12V (DC) Power

12V diesel heaters use only 12V DC power and don’t require 110V AC power to operate at all.

Convenient for Diesel RVs

If your RV has a diesel engine, the heater can get its fuel from the vehicle’s onboard tank. However, there is also a heater that uses gasoline. More on that in just a minute!

Diesel Fuel is Readily Accessible

It’s usually easy to find diesel fuel on the road. Propane can be a bit more difficult to locate, depending on where you are when you need a refill.

No Condensation is Produced

This is a very significant advantage in an RV. Whereas burning propane (with an exposed flame space heater, not your onboard propane furnace, which vents combustion byproducts to the outside) contributes significantly to the humidity in the air and thus to condensation in the RV, a diesel heater (whether you’re using diesel fuel or gasoline) does not produce condensation.

This is actually a big deal because one of the significant drawbacks of propane (space) heaters is the amount of condensation they produce, and we all know that moisture is an enemy of RVs. Diesel heaters allow for the air to remain dry. Again, this is true whether you’re burning diesel or gasoline in the heater. It’s not about the fuel – it’s about the heating process.

What Are the Disadvantages of Diesel Heaters for RVs?

There are a couple of disadvantages of diesel heaters to consider.

May Require a Diesel Fuel Tank

If you’re going to use diesel fuel, you’ll need to have a diesel fuel tank available. If your rig has a diesel engine (like our old diesel pusher did), then you’ll naturally have that tank available. However, if you have LP appliances and a gasoline engine, you’ll either need a dedicated diesel fuel tank or a heater capable of burning gasoline.

Expensive to Buy

A diesel heater can be expensive to buy, but its fuel efficiency and other advantages should allow you to recoup that upfront cost over time.

Can Be Noisy

Depending on the unit you purchase and the type of fuel pump it has, a diesel heater can be noisy when running. To avoid this, you want to select a high-quality heater and be sure to install it (or have it installed) properly. Be sure to research user reviews regarding the noise factor if this is a concern for you.

Things to Consider When Buying a Diesel Heater for an RV

When shopping for an appropriate diesel heater for your RV, there are a number of things you’ll want to consider.

Size and Weight

Diesel heaters are available in a variety of sizes and weights. Consider the size of the space you need to heat. Some units are more compact than others.

Fuel Consumption

Although diesel heaters are more fuel-efficient, some are more efficient than others. Check the fuel consumption rate of the units you’re considering. The less you have to fill your fuel tank, the better, and the more boondocking time you’ll get!

Heat Output

Most heaters produce between 10,000 and 27,000 BTUs. You’ll want to choose your heater based on its heating capacity relative to the amount of space you’re trying to heat.

Ease of Installation

If you’re looking for a heater you can install on your own, be sure to consider the installation process before purchasing. Some heaters are easier to install than others.

Noise Level

Again, we suggest checking user reviews to get a sense from owners of what the actual noise level is when the heater is running. Some heaters are noisy based on the movement of the fuel pump. Some heaters have a rubberized mounting bracket, which cuts down considerably on noise.

Cost vs. Quality

Diesel heaters can cost anywhere from $100 to $2,500, depending on the quality of the heater and the components involved. German-made diesel heaters tend to use higher-quality parts, but that quality is reflected in higher prices. That said, they also tend to be far more durable, which means that you won’t be replacing your heater frequently, as could be the case with a cheap heater.

Beware of inexpensive Chinese heaters. A very low price will generally reflect cheap, low-quality parts. For example, you can pay over $2,000 for a high-quality 2,200-watt German heater, and you can also find a cheap Chinese heater for a few hundred dollars, rated at 5,000 watts. Be cautious when considering the quality of low-priced heaters, especially if durability is a priority. They’re less likely to last and may even be dangerous. As always, check user reviews carefully.

Remote Control

If you want to be able to control your diesel heater from across the room or from another area of your RV, be sure to look for a heater that offers remote control.

LCD Monitor

If you’d like to be able to mount an LCD monitor on your RV’s wall to keep an eye on your heater’s operation, you’ll want to be sure that the installation kit for the heater you’re buying comes with a mounting plate and an LCD switch.

Automatic Altitude Sensor

As mentioned by Roland in a comment below, if you plan to have a need to use your diesel heater when you’re RVing at altitudes above 5,000 feet, be sure that any heater you purchase has some means of adjustment to account for the lower oxygen density. Automatic adjustment is best.

How Do I Maintain an RV Diesel Heater?

Diesel heater maintenance is important for the proper (and safe) operation of your heater over time. You’ll want to follow the maintenance instructions in your owner’s manual to keep it running efficiently. Examples of regular maintenance tasks may be cleaning/replacing the filter, cleaning/inspecting the burner, checking the fuel lines for leaks, and possibly bleeding the air out of the fuel lines.

Having your heater serviced regularly should take care of any potential issues and keep your heater running well for a long time.

What Is a Good Diesel Heater for an RV?

While there are a number of diesel heaters on the market, we’re going to focus here on a single heater. This heater is from Webasto and can be purchased to burn either diesel fuel or gasoline. We’ve chosen to highlight this particular heater for a few reasons:

1. Webasto is a German company, and its products are made with high-quality components. We figure they’re number one in the world among commercial air heaters for a reason.
2. They offer units capable of using either diesel fuel or gasoline. This way, even if your RV doesn’t have a diesel engine, you won’t need to install a separate diesel fuel tank. You’ll be able to tap into your existing gasoline supply.
3. Our friend Brian (RV With Tito) installed one on his RV and created a video about the heater and the installation process. We’ll post Brian’s excellent installation video (he installed the gasoline version), and we’ll also post links to Webasto’s diesel heater and installation kit, as well as its gasoline heater and installation kit.

Brian also posted a video with a report on the Webasto heater after 6 months of use (including how he quieted a noisy fuel pump), and a video with a follow-up at 9 months discussing using the heater at high elevations. All three videos are full of great information for anyone considering one of these heaters.

Here’s a link to the Webasto gasoline air heater kit that Brian installed:

And this is a link to the diesel air heater kit by Webasto:

For more information on other ways to stay warm in your RV see our tips for winter RV camping and winter RV living. And with fall comin’ in strong, you might want to glance back at our RV winterizing tips to remind yourself how to get your RV ready for the season that begins with “W”. 🥶

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