Webasto Heater Installation

ssobol":1r9c9ilr said:
You should consider that the combustion air inlet is about 1/4 the diameter of the ventilation air inlet. Assuming that the air velocities are the same, the combustion air is a fraction of the total air flow. I'm not sure that using an external source for the combustion air will make that much difference. All the Wallis installations on C-Dorys use the cabin air for combustion.
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That is true, regarding the size of the air inlet. However, since that combustion air is being vented overboard out the exhaust, it does create a small suction, which will draw outside colder, (and moist in the case of fog and rain) air into the boat. The ventilation air is equalized with both it's intake and outflow inside the cabin.
 
There should always be some flow of fresh air into the boat--CO / CO2 accumulate, and Oxygen is depleted (from human metabolism alone).
 
thataway":2a5a7qm4 said:
There should always be some flow of fresh air into the boat--CO / CO2 accumulate, and Oxygen is depleted (from human metabolism alone).
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Hmmm, perhaps then I"m best leaving the setup alone... Just looking to keep outside moisture from coming in, and also keeping the cold air out at night when temps are below freezing.
 
I think you mention something similar earlier but what about running an oversized hose from a dry part of your bilge and connecting the combustion intake to that. That will move the vacuum from the cabin to the bilge. There is no heat going through that so any hose material will be fine up until a foot or two of the unit. I think the oversized is important to counteract the flow resistance of a longer hose, the blower might not be strong enough and might create overheating issues.
I’m wrapping up my diesel heater install on my boat and that is what I’m planning to do.
 
C-Wolfe":bn2hv3b5 said:
I think you mention something similar earlier but what about running an oversized hose from a dry part of your bilge and connecting the combustion intake to that. That will move the vacuum from the cabin to the bilge. There is no heat going through that so any hose material will be fine up until a foot or two of the unit. I think the oversized is important to counteract the flow resistance of a longer hose, the blower might not be strong enough and might create overheating issues.
I’m wrapping up my diesel heater install on my boat and that is what I’m planning to do.
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That might be an option. But I'm leaning more into leaving things alone, or placing a through hull next to the heater to draw air in from outside. Still have mixed feelings about it.
 
I installed one on my previous 22 cruiser and did not connect anything to either of the air inlet (combustion and cabin heater). It did warm ups and dry the cabin quite nicely. The 22 had a much tighter available space, and any hose coming down would have encroached in my storage room. In the TC255, I have a quick and easy access to the bilge so I’m thinking why not.
 
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