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Propex vs Espar vs Webasto Heaters For A Camper Van Conversion

#vanlife during winter can range from a cozy ski home base to a downright miserable experience depending on how functional your build is. If you’re planning on living in the North, or at high altitude year-round, then getting a heater installed in your campervan conversion expands your versatility and comfort. This is especially true with a well-insulated van to hold the heat in.

In this post we’re going to discuss the differences between the Propex Propane Heater, Espar Diesel Heater, and Webasto Diesel & Gas heaters.

When it comes to heating your van, these heaters are top of the line. That means they have a high price tag and require an extensive install. If you’re not up to the process, read our post on vanlife heating solutions where we discuss more cost effective ways to heat your van in winter.

If you want something energy efficient that can run the entire night in the coldest of temperatures – continue reading!

  • 24hrs. on 1 Gal.
  • Nighttime noise mode
  • Good Temperature Control & Diagnostics
Webasto 2000stc
  • Works with gasoline or diesel
  • 22hrs. on 1 Gal.
  • 3hrs. per 1lb fuel
  • Clean fuel
  • Less maintenance
  • Quiet

How Do Propex, Espar And Webasto Air Heaters Work?

Installing an air heater in a campervan conversion

Air heaters are installed either inside the vehicle (on the floor) or mounted underneath the vehicle chassis.

  1. First, the heater will draw fresh outside air through an air intake
  2. An internal combustion process heats up coils called a heat exchanger
  3. As the heater blows the fresh air through the coils, the air heats up
  4. Finally, warm air is blown throughout the cabin of the vehicle

In short, these heaters – Propex, Espar and Webasto – share the same basic install requirements:

  • Fresh air intake
  • Air exhaust (for the combustion fumes)
  • Connection to your fuel source (propane, diesel, or gas)
  • 12V source to power the device


The heaters we’re discussing here are externally sealed and the combustion takes place outside of the vehicle cabin. That means unlike a portable Mr. Buddy Heater or a Camco, you do not need to leave the windows open for proper ventilation.

As long as they are installed properly, these heaters can be run 24/7 without worry about fumes or oxygen depletion. Any van build should still have a good carbon monoxide detector, but these heaters will function more like a traditional furnace.

Benefits Of A Built-In Heater

Because these heaters are tapping into larger fuel sources, they are cheaper to run and more autonomous than portable heaters. You don’t have to keep buying disposable 1lb. cylinders and they can run longer than portable heaters without needing to be refilled.

These heater options all have a combustion process separate from the hot air, meaning there is no moisture build up inside the van from the heater.

Generally, these heaters take up less usable internal space in a van build. They are installed out of the way and you don’t have to worry about being as cautious around hot surfaces like you’d find with a fireplace or portable heater.

sleeping in a campervan conversion in the winter

Propex Propane Heater

Propex HS2000 propane air heater for #vanlife

The Propex heater is the most readily available of the three. Running a propane heater has several distinct advantages compared to the gas or diesel options:

For one, propane is a cleaner fuel than both diesel and gasoline. It produces less CO2, Carbon Monoxide, Nitrogen Oxide, hydrocarbon and particulate emissions. While the Espar and Webasto require you to perform yearly maintenance to clean out carbon buildup, the Propex system does not require maintenance.

Propex heaters also work with the varying levels of butane and propane mixes found in different locations. That means that you can use it in pretty much any country you’re driving to!

The Propex heater is the quietest of the three. It also has a low Amp draw of just 1.6Amps. It is the most flexible heater when it comes to installation.

Because of its clean combustion, there is no cleaning or maintenance needed on the Propex heater. Propane has a low boiling point, meaning that it is less sensitive to altitude and cold changes.

Downsides To Propane

The biggest downside to a propane heater is that you must install a large propane tank for it to work. Often van lifers are running several devices off of propane anyway, so you can plan to get a bigger tank and run the whole van off of one system for convenience.

Unlike diesel or gasoline which can be easily tapped into from your vehicle fuel tank, propane tanks are heavy and require more planning to install in your van.

Unless you’re using a standard 20lb. propane tank that can be swapped out, then you can only refuel at designated propane refilling stations, with an attendant on-duty, and during operating business hours. Luckily, these are quite common in the US and with a decent sized tank you won’t be refilling that frequently.

Propane is the least energy dense and most expensive fuel of the three. It’s about 73% as efficient as gas and costs more per gallon, equating to a little more than twice as expensive to run per BTU.

However, this difference is negated a bit from the lack of maintenance needed, and the overall cost is still much lower than using a portable propane heater.

Propex HS2000 vs HS2211 Heater

The Propex heater comes in two models, the HS2000, and HS2211. Both models have a burn rate of 65,000BTU and use on average 1lb. of propane for every three hours of use.

They each have an automatic temperature sensor which will switch the heater on if the cabin temp drops below a set threshold.

The difference between the two models comes in the installation process.

Propex HS2000

The Propex HS2000 is meant to be installed inside the vehicle. Common placement is under the driver or passenger seat, but it can be installed anywhere on the floor. This heater must be installed horizontal and flat. The intake and exhaust pipes need openings cut through the floor.

Propex HS2211

The Propex HS2211 can be installed either inside or outside, which gives you more flexibility with placement. It features multiple bracket fixings for various positions and orientations to accommodate your particular vehicle. You can mount it outside under floors or between the chassis rails, and the ability to orient it in multiple directions gives you a lot of freedom compared to the floor model.

Keep in mind, however, that if it is installed outside, the hot/cold air ducts must go through the floor.

The HS2211 is quieter than the HS2000, though there’s only a 5 decibel difference: 55 and 60 dBa, respectively.

Here is a good step-by-step video for installing a Propex heater

living in a campervan conversion in the winter
  • 3hrs. per 1lb fuel
  • Clean fuel
  • Less maintenance
  • Quiet

Diesel and Gas Heaters

Propex has a lot of big advantages over the Espar and Webasto heaters, but they aren’t the only option. One of the nicest things about the Espar and Webasto models is that they use fuel directly from your vehicle. This gives you the benefit of not needing to figure out how to install a separate tank, plus they’re easier to refill.

Gas and Diesel are more energy dense than propane, so they take less fuel to heat your van. Diesel is the most dense, but it’s also slightly more expensive in the US, so they end up being about the same cost per BTU. Both fuel types are about half as expensive to burn as Propane (again, this is for US prices). Depending on how often you are running your heater, this may or may not be significant in your decision.

Diesel and gas heater units are installed in much the same way as the Propex HS2000. They go inside the vehicle with an air intake and exhaust hole cut through the floor. Many people choose to install it under either the driver or passenger seat.

A fuel line will run between your heater and fuel tank. In fact, newer models of Sprinters and Transits have an extra connection built into their fuel tank specifically for attaching aftermarket fuel lines.

Disadvantages Of Diesel And Gas Heaters

Both gasoline and diesel are dirtier fuels than propane. That means there’s going to be a buildup of carbon over time. The Espar and Webasto heaters are going to require annual cleaning and maintenance to operate properly.
Not to mention – cleaning out carbon buildup is not an easy task! There are a few steps involved including uninstalling the heater, removing the combustion fan, and replacing the burner insert. All of this is going to require tools and a lot of patience.

Here is an informative video from Webasto showing how to replace your burner insert

In addition, gas and diesel have higher boiling points than propane. That means they are more finicky at higher altitudes. While the Espar and Webasto both work at high altitudes, they need to be adjusted to do so.

Furthermore, the Espar and Webasto are both noisier than the Propex, to the point that many people install a muffler.

Finally, not every model of Espar and Webasto are readily available in the US. It can be more difficult to find customer support for these brands.

PropaneDiesel & Gas
Cleaner Fuel Dirty - Requires Annual Maintenance
Quieter To Run Louder Combustion Process
Hard To Carry Easy To Store Fuel
Harder To Refill Easy To Refill
More Expensive Fuel Cheaper Per BTU
Better At High Altitude More Temperamental At High Altitude
Easier To Install Harder To Install
Better US Customer Support Sparse US Customer Support
cozy heater in a campervan conversion
  • 24hrs. on 1 Gal.
  • Nighttime noise mode
  • Good Temperature Control & Diagnostics

Eberspacher Espar Airtronic D2 Air Heater

While Espar makes a number of diesel heaters, the most popular for a campervan conversion is the Airtronic D2 Air Heater.


This particular model can run for 24 hours on just one gallon of diesel fuel which is quite impressive! This heater also features automatic temperature control and diagnostics for the best efficiency. The heater runs through four different stages of regulation, so it can be adjusted properly. In each of these stages are variations on the fan speed and fuel quantity.


The Espar has a few more fancy technical features than the Webasto. While both heaters are loud, the Espar has a nighttime operation mode that will quite it down a bit while you’re trying to sleep.

Digi-Max Controller

Most Espar models come with a Digi-Max controller included. This is a digital display with temperature readings, low voltage protection and auto-shutoff. It also records maintenance hours and troubleshooting tips. In contrast, the Webasto does not have a digital display. It uses a system of diagnostic light codes for maintenance issues.


As stated previously, diesel (and gas) heaters don’t run as well as propane when it comes to high altitude. While there is no altitude adjustment built-in, it’s worth looking into altitude kits if you plan to spend a lot of time above 5,000ft.

The Espar has two upgrade options when it comes to high altitude:

  • High altitude sensor
  • High altitude pump kit

High Altitude Sensor

A high altitude sensor measures atmospheric pressure. It will automatically adjust the frequency of the metering pump every ~1000’ to improve efficiency. Once this sensor is installed, it’s hands-off. You can drive up and down the mountains all day and it will adjust the pump so you have optimum burning efficiency at all elevations.

High Altitude Pump Kit

A high altitude pump kit is less expensive, but also requires a more manual approach. With this kit, you would install a parallel fuel pump with a lower pump volume alongside your current fuel pump.

A rocker switch will allow you to select which pump the Espar uses. When you travel above ~5,000’ you would activate the low volume pump. The opposite occurs when you head to lower altitudes.

Unfortunately, the rocker switch is not that easy to get to or adjust. For the most part, you’ll probably want to leave it set to one height or the other.

A high altitude pump kit makes more sense if you plan to stay at one height for longer periods of time – or if you’re on a tighter budget. Keep in mind that it’s not damaging to the heater to be set for high-altitude and running at sea level. It will simply not be as efficient.

Newer And Older Versions Of The Espar

Current models of Espar heaters are sold with an H-kit (high altitude kit) included. This simply means that you have the option of installing either a high altitude sensor or a high altitude pump kit.

Models that were manufactured prior to 2009 do not have an H-kit included. If you happen to have an older model, you can either install a high altitude pump kit or a high altitude compensator.

A high altitude compensator is essentially the same as a high altitude sensor for models that don’t have an H-kit.

*Note: If ordering your Espar from a website like Amazon or Ebay be sure to check which model you are ordering! At the time of this post, the older models of Espar are being sold on those sites. We recommend ordering through which is based in the US and has up-to-date models.


As stated before, the Espar will require a yearly cleaning due to carbon buildup. In addition to that, the Espar should be run for 30min – 1 hour at least once a month. If you let this heater sit for a full summer without being used, it will run dirty on startup in the fall.

Service and Reliability

Espar has distribution centers located within the US. That means if something goes wrong, you’re going to have much better luck getting it services and receiving replacement parts promptly.

Here is a good guide step-by-step guide for installing the Espar Heater

Webasto diesel heater installation in a campervan conversion
Webasto 2000stc
  • Works with gasoline or diesel
  • 22hrs. on 1 Gal.

Webasto 2000 ST and STC Heaters

Webasto makes both diesel and gasoline-powered heaters. They come in two models, the 2000ST and 2000STC

These models are similar to each other, the main difference is:

  • 2000ST can only burn diesel fuel
  • 2000STC is not currently supported in North America

*If you live in North America and you want to buy the STC for a gasoline vehicle you will not have easy access to support, even at the dealer network.

Fuel and Maintenance

The Webasto heaters can run up to 22 hours on a single gallon of fuel. Gasoline is less energy dense than diesel. That means there will be more carbon buildup when you run the gasoline model, and therefore it will require more frequent maintenance.


Much like the Espar, the Webasto heaters are loud. Luckily, you can install a noise silencer which is not currently an option with the Espar. Most of this noise will be directed outside of the vehicle which will disturb your neighbors more than yourself, but it is something to be aware of.


Unlike the Espar, the Webasto doesn’t have an option for automatic altitude adjustment. If you’re frequently above about 5,000 ft, you can either purchase a rheostat or manually adjust the Webasto for high altitude by reducing the fuel supply.

A rheostat allows you to adjust the combustion fan to run at a higher speed, increasing the air/fuel ratio. If you return to sea level, the downside to this is that the heater won’t run as hot, but other than that it’s not really a problem – in fact, it’s burning cleaner which will help your maintenance schedule.

With a manual adjustment, you won’t need to purchase extra parts but it is a pretty involved process so it’s not something you would want to change back and forth. There are some instructions on how to manually adjust your unit for high altitude on the

Fresh Air Mode

You can choose between recirculated air or fresh air mode on the Webasto heater. This can save you energy and help dehumidify the van.

Service and Reliability

Webasto has a few service centers located throughout the US.

It’s worth noting that throughout our research we’ve come across far more long term mechanical complaints about the Webasto when compared to the Espar. These can range from the fan not blowing correctly, to plugged filters or leaking fuel.

Here is a good step-by-step guide for installing a Webasto Heater

Propex vs Espar vs Webasto

Here’s a quick chart covering all of the points between the three:

PropaneDieselGas or Diesel
3hrs. per 1lb.24hrs. on 1 Gal.2hrs. on 1 Gal.
QuietestNighttime Noise ModeNoise Silencer Sold Separately
No Altitude Sensor NecessaryAltitude Sensor Sold SeparatelyAltitude Adjustment At Dealer Level
Simple DesignBetter Temperature Control & DiagnosticsDiagnostic Codes
No Maintenance RequiredMaintenance RequiredMaintenance Required

Wrapping It Up

In our opinion, a Propex heater should be the top of the list when looking at heaters. It can be incorporated into a full propane system into your vehicle. The lack of maintenance and more versatile performance are very appealing and cannot be understated.

There are two major factors that might lead you to choose a gas or diesel heater:

  1. If you don’t plan on using propane anywhere else in the build, it is a lot of effort to install a big tank just for a heater.
  2. If you will be running the heater for a significant amount of time, then propane will get costly and less autonomous due to its lower energy density.

If you are going with diesel heaters, the Espar heater tends to have better support if you’re in the US and anecdotally we’ve seen less complaints about maintenance overall. In addition, we think it is well worth considering a high altitude sensor for a cleaner and more efficient combustion to go with the Espar.

Kate And Ian Moore, Authors At Parked In Paradise

Kate is the lead content creator for and has spent over two years living in a camper van conversion. She has traveled through 48 US states and writes about van life, camping and RV living.