Webasto exhaust fitting

[DanTribe]

I'm in the process of fitting a Webasto Airtop 200ST and the exhaust through hull fitting supplied is at 90 degrees, not angled as I thought.
My transom is forward sloping, so the outlet will point upwards and catch rain. Can this be right? Surely it will form a water trap in the pipe and block it.
The supplier says that these have been used for many years without issue, so perhaps I'm being a fusspot.
BTW this is a marine kit bought from a UK supplier, bought at Southampton Boat Show, not the lad from Turkey.
Any comments chaps?

 

[wiggy]

Mine is the same, the fitter put it on the topside instead of transom, sorted.

 

[vyv_cox]

I think it would be asking for many problems if leaning backwards. Can you make a pair of wedge shaped blocks to mount it the right way?

 

[David2452]

They are indeed all now 90 degree so you dont have to drill that silly angled hole, however the connection stub is angled so no technical difference, unless you have been supplied with and inland kit of course, still a true marine kit but differs in some accessories. Most Webasto marine dealers should have some of the old style angled ones left somewhere if that's what you prefer and would be happy to swap I'm sure, I think I have a couple somewhere, I assume it is 24mm with an adapter in the kit so you can take the 22mm exhaust on the heater to 24mm exhaust tube. I think your biggest issue may well be that you have under speced the heater though, especially for year round use.

 

[David2452]

Mine us the same, the fitter put it on the topside instead of transom, sorted.

That's what I normally do if possible, but I find small yachts fare better with it on the transom.

 

[vyv_cox]

Most Webasto marine dealers should have some of the old style angled ones left somewhere if that's what you prefer

I bought mine from an Ebay trader, beautifully made and very reasonably priced.

 

[DanTribe]

Thanks for all your suggestions.

The supplier has suggested fitting it to the side, but as I often sail with the rail in the water that doesn't seem like a good idea.
Making wooden adapters as Vyv_cox suggests has also been mooted by another friend but cobbling something together seems to be making complications plus, is wood and hot exhaust a good idea?
I'm minded to buy one of the angled outlets from Ebay, as this is cheaper than the suppliers option of having one specially made, but I'm now worried if this will affect my warranty.
David 2452, thanks for your handsome offer of arranging a swap, but as I didn't buy the kit from you, I'm reluctant to take advantage, it's really not your problem.
There are lots of forward sloping transoms and I'm surprised that suitable exhausts are no longer supplied as standard, only at considerable additional expense.
As a builder,if I fitted a boiler flue designed for a wall into a sloping roof I would expect complaints.
Anyway, thanks, I shall work around this minor hitch.

 

[rob2]

I wonder if you could fix a 90 deg u-bend to the standard fitting so that any water ingress would be limited to a very small amount?

Rob.

 

[David2452]

I wonder if you could fix a 90 deg u-bend to the standard fitting so that any water ingress would be limited to a very small amount?

Rob.

That is what one should be doing anyway, a little water standing in the end of the exhaust is easily ejected, the exhaust tube, just like bilge bump tube should be taken to deck level and then dropped to the skin fitting.

 

[DanTribe]

That is what one should be doing anyway, a little water standing in the end of the exhaust is easily ejected, the exhaust tube, just like bilge bump tube should be taken to deck level and then dropped to the skin fitting.

David
I think you have given me the reassurance I need.
I was concerned that water left in the outlet would form a seal, like a waste trap in a sink, and give back pressure causing the heater not to start or leaking fumes back into the boat.
Do you think an inch or so of water will not matter?

 

[David2452]

Depends where it is, if just in the skin fitting it is easily ejected, if in a loop under the heater it can cause issues, however on a properly fitted and sealed exhaust there should be no possibility of a leak even if you hammer a cork in the end.