AC
Thousands of vessels in the PNW have diesel fired hydronic heating. Hurricane, Olympic or Kubola seem a good choice.
It is all in the install though. In Seattle there are several experienced groups to do this whether Emerald Harbor Marine, Sure or etc. Ask to see a typical install. I was on a reasonably new KK 44 recently and that install was top notch.
Personally I don’t like direct hooking into the water heater due to potential for cross contamination - unless system is valved to bypass the water heater. Yes to a valved engine heat exchanger loop though,, easy to do.
If you place one of the large hydronic heat exchangers in your helm area AC air return flow you’ll get a lot of heat into the ducts without heat pump running, only the fan powered by the inverter. Great for clearing windows on those misty days when cruising.
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