Cabin heaters?? on small boats
Do you need heat on the hook? And do you want the cabin heated on occasion while you snooze aboard? If so, vented heat from a combustion-type source is your only option.
I''d recommend you consider a Force 10 diesel/kerosene heater. 5000 BTU''s (plenty for your C&C), reasonable in cost, simple in operation, with a Charlie Noble that only sticks up a few inches on deck using stock 1" OD piping and comes with its own protective guard. It would require you to carry kerosene (more BTUs), about 1 gal/day of full-time use. It ''should'' eliminate any CO build-up in the cabin but, if using it at night, you might want to consider a CO monitor, too.