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Got to talking to a guy the other night, about putting a heater in line with the exhaust water before it gets expelled into the exhaust. Just how much heat will it give??????? Thanks.
Pretty much none if the engine has an HX.. If the water across your HX is getting that hot you have other issues..

A "bus heater" taps into the engine coolant circuit and if your engine is raw water cooled it would perform only marginally well. Many RWC engines have trouble just heating hot water...

If RWC measure your raw water hose at the injection point and that would be what is moving across the fan coil...

If you have a HX then tap the bus heater into the coolant loop and you will get cooked out of the boat...
 

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Hamilton Marine has a huge selection of "bus heaters" (made by Heater Craft) as the local Maine and Maritime Lobstermen all tend to have them..

I've installed a bunch of the Heater Craft units and we had one on our old power boat too, good units. Unfortunately they just don't do anything when you stop the engine, so are of little use on a sailboat, unless you motor a lot...
 
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