I lived aboard in Norfolk for a winter with electric heaters. Condensation
was a BIG problem. The boat had a liner and every surface would be covered with a film of moisture after a short time of going aboard. Condensation
was so bad that the mattress in my berth mildewed and bedding always felt damp. Once the outside temperature climbed above 40 degrees or so, it wasn't much of a problem. I wouldn't want to live aboard in a cold climate without an outside vented heater.
Espar, etc. hot air heaters give the best heat distribution but they like their electrons. Know a 40' boat that 45' boat that races year around in Puget Sound
. They put aboard a Honda generator
to feed the heater's thirst for amps on overnight races. If you are going to be away from a dock and/or don't want to have to run a generator
, the wall mounted heaters are the only way to go. Also, the ducting takes up space and can be a problem to run it to where you want it.