Matt: I assume that the heaters you are considering use the engine cooling water for the heat source. If that is the case, then you definatly want a 12 volt system, as this is what your boat's electrical system is. The only electrical item is the blower, and it doesn't draw enough power to require a 24 volt motor. The only reason that the manufacturer would have a 24 volt model would be so that they could be used on a boat/truck that had a 24 volt system. If you weren't planning on using the engine cooling as the heat source, then my suggestion is FORGET IT! You will never get enough output from your alternator to keep you warm. Rod
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