Webasto 3500 again

[Csail]

Is it best to take intake air from outside or in?
Also is it ok to T off from the engine fuel supply just after the water seperator/filter?
How hot is the output ie would you want it on your ankles whilst sat down?

 

[cpedw]

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Is it best to take intake air from outside or in?

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That depends ... From inside, it heats up quicker and doesn't need to work so hard. It doesn't give good ventilation though. I chose a halfway - inlet in the closed off space that might be called a lazarette - not outside, but not exactly inside the boat either. It has worked well for 3 years now.

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Also is it ok to T off from the engine fuel supply just after the water seperator/filter?

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I found a second outlet on the water separator and used that. Engine and webasto work fine together or separately.

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How hot is the output ie would you want it on your ankles whilst sat down?

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It can be hot enough to be verging on uncomfortable on the ankles, when right next to the outlet. But you don't need to move much to avoid it.

Derek

 

[SailingDog]

Hi, re: temp of output, the heat from my 3500 is no where near as hot as you describe, I've used insulated ducting and draw fresh air from in the lazarette. What have I got wrong ?

Any suggestions considered.

 

[FWB]

I've got my 2000 running at the moment. The outlet temp is far too hot to put your hand against, even at medium setting.
Intake is from cockpit locker.

 

[pcatterall]

Combustion air from outside room air from in.
My rough test on D2s is to hold my hand 6" from the hot air outlet, I usually have to move it after 10/20 seconds. Interestingly, in this cold weather they dont seem as hot, I can only think that the heater can only 'add' so many degrees to the air coming in. The air in my workshop was freezing so the heater could only raise the temp so far. By recirculating this warmer air I guess the output air will gradually get warmer.
If it blows out near your ankles you can probably deflect it with the louvres.

 

[PeterGibbs]

Combustion air is drawn in via the outer sheath on the exhaust pipe. It must come from a non habitable part of the boat for safety reasons: a cockpit locker would be ok; I use an inlet high on the transom.

The thermostat should take care of the temperature in the cabin. The heater can run continuously but that's not the intention. I sited the 3 air outlets in the rear cabin, heads (for clothes drying) and saloon. The air intake is on the other side of my aft cabin and the main outlet in the saloon. (one outlet has to be uncovered and unlouvred so as not to generate back pressure in the combustion chamber) Works a treat and soon gets toasty.

PWG