Originally Posted by Ranger-26-Duluth
What is the safest, easiest way to heat your boat when sailing the northern Canadian side of Lake Superior ?
We have a diesel Westabo forced air heater. It's very easy to use, takes no cabin space, and sips a small amount of fuel from our primary fuel tank. The downside is that they are pretty expensive ($2-3k). It's warmest in our (small) aft cabin/quarterberth, but does a good job in the main cabin as well.
I don't use it while sleeping, but it's nice to use it and take the edge off on a cool morning.
Electric heat would be a non-starter on a boat, you'd need a crazy amount of batteries. Most household electric heaters consume ~1000 watts. On a typical sailboat with 2 batteries you have about 1000 watt hours of useful battery capacity (drawing two 12v ~90 amp hour batteries down halfway). That would mean one hour of heat.