where did most put heater exhaust thru hull?

Jake B

In the mapping stages of heater project. was wondering where everyone placed there thru hull exhaust at? it would be easier and have more of a down bens(hopefully keeping water out ) if I placed it just below the accent line on the next rib down. same place my sink drain is at. I would be able to put it just below rub rail on the accent color but would be more of a straight over for exhaust and no down angle? any input one way or the other plan on drilling this weekend.

nimrod · Posted: Thu Feb 20, 2014 8:35 pm Post subject:

NORO LIM · Posted: Thu Feb 20, 2014 8:47 pm Post subject:

I don't know what stove you're installing, but the Wallas 1300 heater I'm putting in comes with instructions that require the exhaust exit to be at least a certain minimum below the high point in the exhaust line, and at least a certain minimum above the water line. That leaves a very narrow band to choose from - if I a fudge a millimeter or two, I think I can mount it just above the bottom edge of the green accent strip, otherwise the flange of the exhaust port will overlap the green and be partly on the white. I haven't decided yet whether compulsion to do it exactly by the book or esthetic considerations will rule.

There are a lot of competing considerations:
- What do the instruction say, if anything;
- Will the hot exhaust port be near open windows, fenders, lines, boarding access, fuel fillers or vents;
- Will there be good air flow across the opening?

nimrod · Posted: Thu Feb 20, 2014 9:10 pm Post subject:

here's a photo of my wallas exhaust

tcr_pnw · Posted: Thu Feb 20, 2014 10:10 pm Post subject:

Up as high above the waterline as possible!

I get water in on mine due to the factory install a little to close to the waterline. In heavy seas it will take water. When I install the Espar I'll add a clamshell with the new through hull (I don't want to patch and relocate).

Discovery · Posted: Thu Feb 20, 2014 11:02 pm Post subject:

I put ours next to the Wallas stove exhaust.[img]http://www.c-brats.com/modules.php?set_albumName=album1447&id=IMG_3925&op=modload&name=gallery&file=index&include=view_photo.php[/img]

I can't seem to do photos on the iPad, but look at the pic in the Espar album.

Jake B · Posted: Thu Feb 20, 2014 11:03 pm Post subject:

thanks for the replys, and pic that is where it would fit best with a good down ward angle. nimrod do you ever notice water getting your thru hull? I am still dry fitting, but lower like in the pic posted would be the easiest to do i will look again initial read of instal instructions didn't say one way or the other. the thru hull i go does have upward angle on it as well to help eliminate water intrusion

Sunbeam · Posted: Thu Feb 20, 2014 11:25 pm Post subject:

canal charterguy

My thru hull fitting on my 05 22' cruiser is located as in the picture and was installed at the factory. We fish the boat in sloppy seas in the straits and ocean.It has always been wet under the cabinet. I scratched my head and ran towels under there for a VERY long time. I also tried applying a sealant barrier on the inside to no avail. Finally a couple of seasons ago I put a standard rubber drain plug in outside the hull and no problems since. I am very safety minded and don't like this option but it is dry under the cabinet when the unit is not in use. JUST REMEMBER TO REMOVE THE PLUG BEFORE TURNING ON. I also always run a carbon monoxide detector. If there is an option to go higher on the exhaust I would.

C-Hawk · Posted: Fri Feb 21, 2014 1:57 pm Post subject:

I had to take mine out and replace using a high temp caulking sealant to keep the water from coming in with a quartering sea hitting that side. I installed the sealant at the thru-hull and the flex tube connection.

mgarr682 · Posted: Fri Feb 21, 2014 2:21 pm Post subject: Leaking at the exhaust fitting...

When I talked with the folks at Scan Marine about moving my Wallas stove/heater they told me to be sure to use plenty of high temp RTV when mounting the exhaust flange because the flange is only tack welded to the tail pipe and not fully welded. This allows water to seep in around the outer flange and the pipe the exhaust hose is connected to. I made sure to pack RTV into the very small gap and used plenty under the flange where it sits against the hull. So far no leaks.

Jazzmanic · Posted: Fri Feb 21, 2014 2:33 pm Post subject:

OMG, after 9 years, my question has finally been answered. I always wondered why water would appear under the cabinet. It was very random but I thought it might be coming in through the Wallas exhaust thru hull. Now my suspicions have been answered. I guess I need to follow the suggestions in this thread in order to fix the issue.

Thanks guys! Peter

Jake B · Posted: Fri Feb 21, 2014 10:38 pm Post subject:

thanks for all the replies. I looked again today and for some reason I was thinking I would have to mount heater as high as I could but after looking again today if I mount in the middle I can get a good up bend and still exhaust in the accent area. I have the high temp stuff just waiting on a few parts then ill get it in and post some pics. thanks

NORO LIM

mgarr682