Webasto VS Propex | Real World Van Heater Comparison


Webasto VS Propex | Real World Van Heater Comparison

Summer is almost over and those cold mornings are a reminder it’s time to install a heater in your van, right? Both Webasto or Propex are solid options, but which one is the best? We installed both the Webasto Air Top 2000 and the Propex HS2000 in our van; after an entire winter spent in USA and Canada chasing the snow full time, at temperatures as low as -15F (-26C), we have a few things to say about these heaters and we think we can help you choose between the two!



1- Overview

We think that Webasto (and Espar) gasoline/diesel heaters and Propex propane heaters are the best heaters out there, because:

1- They produce dry heat. That means:

  • No molds in the long run. Relative humidity inside the van is around 35%-45% during winter, even in the evenings after drying our gear.
  • Comfortable heat. (see “what’s wet heat” just below)
  • Clothes and gear dry fast, surprisingly fast. Ski gear is normally dry after 1.5 to 2.5 hours, boots are totally dry late in the evening.

So what’s “wet” heat, then? Catalytic heaters such as the Mr. Heater Buddy produce a lot of moisture; indeed, water is a by-product of propane combustion (see Wikipedia)! Try it for yourself: get in your van after a day of skiing and ignite the Mr. Heater. Condensation appears on the windows almost immediately and the heat feels damp, heavy and uncomfortable.


2- The heat is blown out of the heater via a powerful fan. That means:

  • Hot air is pushed far away and mixes with cold air, so heat in the van is more uniform.

The Mr. Heater Buddy (sorry Buddy, no love for you) might produce enough heat, but the van is freezing cold just a few feet from it. Not fun.


3- They are both vented heaters. That means:

  • No need to crack the windows open to stay safe. That’s a good thing because, you know, you’re trying to warm up the van after all!! (but vented heaters or not, remember that minimal ventilation is always recommended at all time)

Indeed, the combustion is external to the van: combustion air is taken from outside and rejected outside (along with carbone monoxide and moisture by-products). Hot air is transferred inside the van via a heat exchanger.


Drying the backcountry ski gear FAST!


2- Specifications

Here’s some factual information:

Webasto Air Top 2000 ST/STC Propex HS2000
Fuel Diesel or Gasoline Propane (or butane)
Dry or Wet heat? Dry Dry
Heating Capacity 7000 BTU/h 6500 BTU/h*
Air Flow 55 cfm 60 cfm
Electrical Consumption
  • Startup: 6.5 A (for one or two minutes)
  • Low: 1.3 A
  • Medium:1.7 A
  • High: 2.3 A
  • ON: 1.6 A
  • OFF: 0 A (duh)
Fuel Consumption 0.03 to 0.07 gal / h

(0.12 to 0.27 L / h)

0.33 lb / h
Dimensions 12.25″ long x 4.76″ high x 4.72″ wide 15.5″ long x 4.0″ high x 6.8″ wide

Propex-HS2000-Dimensions (inches)

Weight 5.73lb ?

* The Propex HS2000 is rated 6,500 BTU if used at 14 W.C. propane pressure. Regulator normally delivers 11 W.C. in North America so output will be reduced.


Grand Teton National Park Backcountry Skiing
Grand Teton National Park, January 2018 (faroutride.com/fifth-month).


3- Real World Observations

Enough facts. Really, how does it feels to use the Webasto VS the Propex heater? Here are the differences that are noticeable:

1- Cycling

Both heaters are controlled by a thermostat; the user select the right temperature and the heater will maintain it. The Webasto Air Top 2000 has three speeds (low/medium/high), while the Propex HS2000 only has one (ON/OFF). It means the Webasto generally produces a constant noise versus cycling noise for the Propex. It’s easy to get used to a constant noise, but cycling is what wake us up at night…

Winner: Webasto


2- Noise level

– Inside = medium/high for the Webasto, medium for the Propex.

– Outside = High for the Webasto, medium for the Propex.

Winner: Propex


3- Heat Capacity

We feel the Webasto has more heating capacity (heat faster and hotter on very cold days).

Winner: Webasto


4- Heat Uniformity

– The Webasto Air Top 2000 pushes the hot air further than the Propex HS2000, so heat is more uniform in the van.

– Bonus: The Webasto can be installed under the passenger seat, so the hot air is “produced” by heating the cold air at the floor in the cabin; since this is the coldest area in the van, it makes the front of the van much warmer. That’s very important for us, because with out interior layout we hangout a lot in the swivel seats (see our swivel seats review and installation). Installing the Propex towards the front of the van won’t produce the same result, because the cold air won’t be “sucked” from the floor (feet rest) area, unless you install some kind of ducting…

Winner: Webasto


5- Fuel Monitoring

The Webasto uses the gasoline/diesel from the van tank. It means that, as long as you keep your tank above third full (below that, the straw on the Transit will suck air…) you will never run out of heat; that’s a huge benefit! With the Propex, the propane tank level has to be monitored and the tank filled periodically.

Winner: Webasto


6- Controller

The Webasto can be purchased with the neat (and sexy) MultiControl* (see interactive tutorial). It’s great because there is a 7 days timer to program the heater to automatically start / stop. For example, we program the heater to start automatically at, let’s say, 6 AM in the morning before we wake up. Or we program it to start, let’s say, an hour before we finish our skiing. The MultiControl also allows you to use the fan only (no heat); that’s useful to dry the shoes in summer 🙂 By comparison, the Propex controller has that 70’s look…

*The MultiControl is available for the STC model only

Webasto MultiControl
Webasto MultiControl HD

Winner: Webasto


British-Columbia, February 2018 (faroutride.com/sixth-month)


4- Installation

We have comprehensive installation articles for both heaters:


Oh, and if you are wondering, the winner is: Propex! It’s easier to install.


5- Maintenance and Reliability

The Propex HS2000 burns clean and is not prone to get clogged with combustion by-products (soot, etc.). It will work hassle-free for years and years with virtually no maintenance!

The Webasto (and Espar) are a bit more finicky and tend to get clogged with soot (carbon buildup). We read reports of people running them for 5 to 7 years with no maintenance at all; on the other hand we also read reports of people have to clean them almost each year… What’s our personal experience with it? We actually had ours failed (carbon buildup) during our first winter. We then replaced the combustion chamber to start from fresh; we went through our second winter with no issues at all!


Here is the full version of the story. We did a lot of research, a lot of thinking, and the result is all here:


And here’s the short version. With the following changes, we think our Webasto will work as it should:

  • We removed the exhaust silencer because it add restriction (if you read the “full version story”, you know by now that the gasoline models seems to be more prone to carbon buildup than the diesel models).
  • We adjusted it for high-altitude (faroutride.com/webasto-espar-high-altitudes).
  • They are prone to produce and accumulate carbon and soot when running at low speed, so:
    • We try not to let the heater run at “low” speed for extended periods; if it does, we run the heater at max speed for 30-45 minutes or so before shutting it down.
    • Before turning the heater OFF, we always run it at high speed for 15 minutes. We can actually see small particle being pushed out of the exhaust during that process!


Winner: Propex


Grizzly Peak (Rogers Pass), British-Columbia, February 2018 (faroutride.com/sixth-month)


6- And the winner is…

The Webasto Air Top 2000 wins if, like us:

  • You have a love affair with snow.
  • You use your van during winter (constant sub-freezing temperatures). That’s especially true if you practice winter sports and there is clothes drying involved… A heated van is an AMAZING ski cabin; ski-in, ski-out!


The Propex HS2000 wins if:

  • You use your van for short/medium periods during winter, or for long periods in cool weather.
  • You’re looking for something to warm up the van in the morning and to chase the humidity out.
  • Don’t get us wrong; the Propex is fine for full-time winter living, but in our opinion the Webasto is better…


Seventh Month on the Road (7)
Basecamp, Kootenay Pass B-C, March 2018 (faroutride.com/seventh-month)


7- Where to Buy



8- Bonus: Should you install both heaters?

Nah, it’s not necessary. We normally use only one of the two (the Webasto), even for extreme cold. But having two has some advantage:

– Backup.

If one fails, we won’t turn into snowmen.

– Boost Mode.

We sometime use both to warm up the van real fast. Once a comfortable temperature is reached, we turn the Propex OFF.

– Prevent the van from freezing.

If we’re not in the van for a long time, we set the Propex to minimum and that will keep the interior of the van just above freezing temperature (so our beer reserve don’t explode!!). This way the Webasto don’t run on low speed for an extended period (see “Maintenance and Reliability” above).


-22C Outside, let’s just stay in the van today… Fernie B-C, March 2018 (faroutride.com/seventh-month)




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24 thoughts on “Webasto VS Propex | Real World Van Heater Comparison”

  1. what was the highest elevation you used the webasto(gas)? I live at 7000′ and often camp higher (10,800′) and am wondering if the webasto (gas)would work in that elevation. Thanks

  2. Hi! I don’t know if it was mentioned before, but would a electric heater run on a generator produce enough heat in winter?


    • Probably yeah, but I wouldn’t want to park near someone that has a generator running almost continuously 😉 So if you already have a generator and you just need to buy the electric heater, try it. But if you’re still in the design phase, I would really consider gas/propane heater…

      Good luck!

  3. I just finished my propex install. So far I have only insulated the floors, all walls/ceiling/windows are uninsulated. It seems that when running the propex on high in 30F outside temps, the van only gets up to about 50ish degrees. Since you say you are able to keep your van above 60F down to about 0F outdoor temps, I assume my issue is due to not having insulation yet. Anyways, this was all a long way of asking if you feed 11 in.w.c. propane to the heater. I know the propex manual specifies 37mbar, which is closer to 15 in.w.c., but I’ve been supplying 11 in.w.c due to being in the US and having other appliances that require 11.

    • Yes, we feed 11 W.C. However, keep in mind the Propex is our backup heat source. The T° data we provide is using the Webasto heater (which produces a little bit more heat).

  4. Thank you for your comprensive explanations. If not needing heat for cold below
    6 degrees what do you think of utilizing a radiant floor heating product? Been mulling this around in my mind for a while.

  5. Hi Antoine,

    Setting aside the inconvenience of filling up the propane tanks, how well do you think (or find) a Propex would work in a reasonably well-insulated van in the -20C to -30C temperature range like we might find during a typical cold snap during a Canadian winter?

    Would it be strong enough to keep the interior at a comfortable 21C room temperature if it was that cold outside? Asked another way, what would you say would be the coldest outside temperature where the Propex would still be able to maintain a comfortable 21C room temperature?

    Many thanks!

    • First of all, the Propex is rated for -20C minimum… (not sure what happens below that).
      Second of all, MAINTAIN is the keyword here; if your entire van is frozen, expect it to take a loooong time to heat up at -20C. (that’s true with the Webasto as well).

      In the -20C to -30C range, I expect the Propex would struggle to keep the van above 18C… but I could be wrong, it totally depends on your van layout/insulation. (for example a large volume of our van is occupied by the “garage” which is not fully heated; that “gives more heat” for our living area).

      I think that Webasto/Espar have a little more heating power.

      Hope that helps!


  6. Hi,

    Left an earlier comment about your size for the Propex above being incorrect. You can disregard. I see now that you were referring to the entire length (most grapics on Propex do not) including the output/input ports at one end and the propane input at the other. I can confirm the the HS2000 “does” fit under the passenger seat though. Thanks!

  7. HI Antoine,
    Great info as always. Just a note that I think your measurements on the Propex are incorrect, and that the HS2000 does in fact fit under the passenger seat (a Whistler friend has done it. I plan to do the same.)

    I think perhaps the listed dimensions are for the HS2211 or HS2800. Admittedly, the layout on the Propex Canada site here (https://propexcanada.com/product/hs2000-blown-air-heater/) is confusing, but going straight to the UK manufacturer site here (https://www.propexheatsource.co.uk/heaters/hs2000) the dimensions in mm are 320L x 172W x 100H, which is approx 12.05″L x 6.8″W x 4″H.

  8. We’re currently building out our Transit for living and working. Would the Propex be able to fit/function within the same space that you mounted the Wabasto?

    • I highly doubt that, but you could confirm it by removing your seat and using the dimension provided in this page. Remember that the exhaust/intake for the combustion have to go through the floor and there’s a frame under the body…

      Good luck 🙂

  9. Awesome write up. I struggled with this decision around a year ago and ended up buying the propex. You hit the nail on the head though as far as who and which heater is better depending on your usage of the van. We DO NOT live in our van full time and are absolutely stoked on the PROPEX. I agree though if we were having to fill the propane tank every 2 weeks that would get old. The propex is simple in all aspects and would recommend it to other in our situation.

    Merci et bon voyage!

  10. Hey guys, thanks for detailing your usage of the Webasto. I’ve already installed mine but am just beginning to use it. I’m wondering, what do you consider a “long time” to keep the heater running on low?

    And was there a certain altitude that you’ve researched is best to set the fuel/air ratio at (high altitude mode). I’ve purchased the rheostat and multi-controller to do so, just curious if you’ve heard any good figures from Webasto on an altitude that would be set semi-permanentally for most conditions. Meaning to keep the ratio leaner even when moving between mountainous (but less than 12k realistically) and flatter terrain.

    Great tips on reducing the carbon build-up. I’m hoping to avoid the soot situation you previously reported.


    • Hi!
      What’s long time? I honestly don’t have to exact answer to that, but I would say a few hours.
      We adjusted it with 12:00/9:00 as described here: https://faroutride.com/webasto-espar-high-altitudes/. It’s approximate; to get the BEST adjustment, you would have to calibrate it using a CO2 sniffer:

      “At that point, a Webasto dealer will actually check the adjustment by analyzing the exhaust gas when the heater is running; they have a machine that tells if the oxygen/fuel ratio is correct for the current altitude. We don’t have such a thing, but TechWebasto strongly recommended us to borrow an “Automotive Exhaust Gas Analyzer” from an auto service shop. We’re constantly changing elevation so there is no way to have the perfect setting, but at least the “Automotive Exhaust Gas Analyzer” gives a baseline for the adjustment (so it’s not done totally blind).”


    • It’s not that the Propex lacks heating capacity, having to re-fill the propane tank every other week or so during winter is no fun! Especially since we live full time in the van…

      That’s what make the Webasto win, mostly.



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