Sealing around the heater exhaust thruhull

Ron on Meander

I'm installing a Wallas 1800 furnace in my boat and I'm wondering what others used to seal around the exhaust thruhull on their installs. I've had people tell me that because the thru hull is a duplex, (cold air return out side the centre exhaust), I could just use 3m 4200 as a sealant because the temp next to the hull doesn't get all that hot, just the centre exhaust pipe gets hot and its inside the outer sleeve of the cold air return.
Any thoughts and suggestions appreciated.
Thanks
Ron

Alyssa Jean · Posted: Sat Apr 19, 2008 4:09 pm Post subject:

Can't help you on the question Ron, but I would be very interested to see some pictures of the installation when you are complete. This is something I could be interested in.

Sea Wolf · Posted: Sat Apr 19, 2008 5:34 pm Post subject:

Ron-

Most folks just use a High Temperature RTV silicone rubber compound available at your local auto parts, RV, or marine dealer. They're designed specifically for that type of application.

I don't know if 5200/4200 and the like are compatible with high temperatures or not. I don't think they'll "fill" the space around the tube as well as the RTV.

Joe. Teeth

thataway · Posted: Sat Apr 19, 2008 6:42 pm Post subject:

Agree with Joe. I installed a 45,000 BTU diesel hydronics system on the Cal 46 we used to cruise Alaska for 3 years. I used the RTV silicone, and had no problems. The hull never got hot. The small Wallas unit should not be a probelm.--just don't put a fender or other item over the exhaust!

Ron on Meander · Posted: Sat Apr 19, 2008 6:54 pm Post subject:

Joe & Bob,
Thanks for the tip about the RTV silicone. I just ran out to the local NAPA and picked up a tube.

David,
For sure I'll post pictures and you are very welcome to do a personal inspection at the Friday Harbor CBGT in May.

Thanks again for the help.
Ron\

tsturm

Catch 22 · Posted: Mon May 19, 2008 12:04 am Post subject: wallas stoves

im starting to design the interior of my boat, it pretty much has nothing in it right now, im gonna be putting in a wallas stove eventually but i want to build it into the design now, im wondering if anyone has pictures if the whole system, the tank, hoses, exaust, so i can get an idea of a good place for it, and how much space it needs, any info, dimentions or pics would be great, thanks...

tsturm · Posted: Mon May 19, 2008 9:48 am Post subject: Re: wallas stoves

Catch 22 · Posted: Mon May 19, 2008 9:30 pm Post subject:

is that a one gallon tank, how long does that last, anyone know the length and width of the stove top...thanks for the pic...

Dora~Jean · Posted: Tue May 20, 2008 12:54 am Post subject:

Catch 22, I installed a Wallas 1300 Heater, should be similar enough for comparison. Go to my album, I have photos of the installation for a CD25. There are other installs on CD22's. As far as how long does a gallon last, I believe my 1300 uses about 4 oz per hour and if I remember correctly, they estimated about 40 hrs per tank (5 quarts).

tsturm · Posted: Tue May 20, 2008 1:49 am Post subject:

Catch 22 · Posted: Wed May 21, 2008 5:44 pm Post subject:

thanks folks