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Old 11-13-2019, 04:38 AM   #4
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ksanders's Avatar
Country: USA
Vessel Name: LISAS WAY
Vessel Model: BAYLINER 4788
Join Date: Feb 2011
Posts: 4,487
Originally Posted by BruceK View Post
We looked at these recently. The issue seemed to be getting the hot exhaust pipe through the hull or elsewhere without burning the boat. One "original" version, can`t recall the brand, cunningly runs the exhaust line inside a wider tube comprising the air intake.
A marina neighbour fitted one to his small RV. Says he would have mounted it under the floor if he had his time over but, main concern is even on low, the RV gets too warm, so he opens a window. In a demo,it ran fast with some fan like noise, then throttled back to quiet. He seems pleased with it.
The Wallas furnaces ( are designed for boats. They have the intake and exhaust that you are describing.

The intake is a larger tube, and the exhaust is a smaller tube that runs inside the larger intake tube.
Kevin Sanders
Bayliner 4788
Seward, Alaska
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