I've probably said this many times here, but it bears repeating:
Those things are designed to exhaust directly down from the chassis of a truck.
In a boat
, you not only have to worry about directing the exhaust outside, but the exhaust hose can get red-hot. Literally. Not something you want anywhere near any flammable wood or fiberglass
. And since they're not made to use a long exhaust hose, the backpressure may cause it to overheat and shut down. You also have to worry about water
getting into the hose and pooling in any low spot, or, worse, getting back into the heater.
Solve the exhaust problem, and they're great.