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Old 11-13-2019, 01:52 PM   #5
ben2go's Avatar
City: Upstate,SC
Country: USA
Vessel Name: Dutch Barge Caroliner
Vessel Model: Selway-Fisher 45' Teign Luxe Motor
Join Date: May 2012
Posts: 2,655
Originally Posted by NWSeadog View Post
Ben - Thanks for the link. Great information. My Eberspacher has always been touchy but something I've lived with. These videos gives me ideas for future upgrades.

You're welcome. There's probably some minor issue causing it to be fussy. Really simple little heaters.

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.

There are thru hulls designed specifically for passing the exhaust through the hull.

$55! Cheaper than I thought. There are a few sizes to chose from.

The controller sets how fast and hard the heater runs when it's powered on to heat. There are several controllers available for the clones.

Originally Posted by ksanders View Post
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.

Those are good little units. Seems weird to have the exhaust and intake run together like that. I have an oil furnace in one of my mobiles homes that is set up like that and it runs to the roof. Nordyne took over Intertherm. They say my furnace is a poor design with many problems and I agree. I wonder if the smaller size of the Wallas is why they work so well. My furnace is rated at 80k to 120k btu depending on the fuel used. It can run on kerosene #1/#2,diesel #1/#2 propane, natural gas, heating oil #1/#2. All it takes is a nozzle change and setting the intake combustion air. I used #2 heating oil. It was the cheapest.
What a pain in the transom.

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