Carriage bolts were sunk through the deck to mount the heater. This is the perfect way to mount it–if you want to guarantee that it will leak and rot your deck. I constructed a mounting plate from 3/8″ plywood, epoxied some countersunk bolts through it, and epoxied it to the ceiling of the engine room with thickened epoxy. I managed to move it back into the corner more in the process, gaining us some extra room.
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