... Understand this comes from a guy who barely knows what end of a hammer to use to put a screw in a wall to hang a picture.
How about an inverter wired into the boat, and use an electric heater? I would think that this would eliminate a potential CO problem, and with a higher wattage inverter (thinking the types that are used in motor homes), a smaller wattage heater may do the job.
I wouldn't imagine using one of these while running at higher speeds, so the tipping problem should be minimal.
Is this a viable option?