Have you thought about running it off your engine? My father in-law is a engineer with air condition units for Trucks and told me I could run heat off my 20ft Bayliner. They sell units to where you set it under your console or where ever you need to put it with on and off switches. Run hoses from the engine to the unit and its operated by fan. I haven't completely looked in to this system yet and I'm actually dragging my a@! to get it done also.

Hope fully this will help you.

Fish On,

ErnDog