RE: solid fuel heater?
I burned a coal boiler for 20 plus years at my house in Ct. There is a LOT of ash with coal and it is very dusty, no matter how careful you are. Yes it will easily last all* night, but I would not burn coal on a boat because of the mess.
If you want to save $$ insulate the boat better for winter.
If you want a backup for power outages consider propane or a an old fashioned kerosene heater.
Or a pellet stove. It probably can run for a long time on an inverter (if it has a blower).
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