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I don't have an answer for you but I've been following your build and please keep documenting it. It's a joy.
Heat pumps are normally not great for really cold weather, because they can only handle so much temperature difference. But in a boat, if your ambient radiator is in the water, the coldest the water can be is about 0'c. So you'll always get usefully room-temp heat out of it as long as the water is liquid.
Heat pumps are normally not great for really cold weather, because they can only handle so much temperature difference. But in a boat, if your ambient radiator is in the water, the coldest the water can be is about 0'c. So you'll always get usefully room-temp heat out of it as long as the water is liquid.
