For my small F-24, with no cabin heating and no justification for the complexity of an installed system, this has been one of my best upgrades. I made it entirely from scrap in about an hour. It is based on the idea that most boats already have a heat source with some safety measures in place. All it needs is a heat transfer surface and a smoke stack, and you have a vented heater that is safer than a portable heater that vents combustion gases straight into the cabin.
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