This is a follow-up on our Webasto Air Top 2000 STC air heater installation post (faroutride.com/air-heater-installation).
Since then, we had the chance of using the Webasto and we LOVE it! Evenings and mornings are much more enjoyable when it’s nice and warm.
The only negative point of the Webasto is the noise.
Here are the noise sources we identified:
- Fuel pump “ticking” (or “clicking”)
- Heard mostly outside, but also inside the van
- irregular frequency, so this is quite disturbing
- Exhaust pipe
- Heard mostly outside the van
- Intake pipe
- Heard mostly outside the van
- Heard inside the van
- Regular noise, does not bother us
How bad is the noise? Enough so that during our first few nights, we did not sleep so well. We also felt bad for our neighbors installed in a tent just beside the van…
Afterward, we implemented the modifications proposed in this post (keep reading!). Inside the van, we now barely hear noise except for the fan (we’re OK with that since it is a regular noise). Outside the van, the noise remains but was reduced to an acceptable level. We believe these modifications are worth the (small) price and the (small) effort, we’re glad we did it!
TIME SPENT ON THE JOB: 2-4 hours
TOTAL COST : 70-80$ USD
- 90 degrees fuel hose elbow (two of them required, 8.95$ each, Buy from Butler Technik)
- Exhaust Silencer Muffler 22mm (Buy from eBay)
- Intake Silencer Muffler 22mm (Buy from eBay)
- Nothing fancy
What we did:
1- Fuel pump “ticking” (or “clicking”)
First, we followed the recommendations of Butler Technik (Webasto Fuel Pump Noise Reduction) and installed 90° fuel hose at the entry and exit of the fuel pump:
We also inserted a layer of closed-cell foam between the fuel pump “P” clamp and the van structure. No picture to show, but you get the idea. A piece of camping foam mattress should do the trick also.
This has provided a slight improvement on noise level. Just don’t expect a major improvement. However, it is quite easy to do and is cheap, so it’s worth it doing it.
2- Exhaust pipe
The installation of an exhaust silencer is probably the best contributor of the noise reduction. It is definitely worth it and is easy to do.
EDIT: After having some carbon buildup in our Webasto, we decided to REMOVE the silencer from our installation. Silencers increase flow restriction and it’s then more prone to carbon buildup. Gasoline Webasto are more subject to carbon buildup than Diesel Webasto, we were told by Tech Webasto.
Remember that by adding a silencer, the exhaust+intake pipe maximum length is reduced from 5 meters to 2 meters because of the pressure drop. Consult the Webasto Manual.
3- Intake pipe
We missed that one when we ordered our stuff, so let us know how it does!
As we mentioned above, this is a regular noise and does not bother us. We did nothing about it.
ON SECOND THOUGHT…
These modifications did not drastically reduce the noise, but are worth doing considering the price and the effort!
After having some carbon buildup in our Webasto, we decided to REMOVE the silencer from our installation. Silencers increase flow restriction and it’s then more prone to carbon buildup. Gasoline Webasto are more subject to carbon buildup than Diesel Webasto, we were told by Tech Webasto.
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Hello! We’re Isabelle and Antoine 🙂 In 2017 we sold our house (and everything in it), quit our engineering careers and moved into our self built campervan. We’ve been on the road since then and every day is an opportunity for a new adventure; we’re chasing our dreams and hopefully it inspires others to do the same!
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