Now ... more questions :-) .... polar package and insulation, on the boat i don't have much of the choice as most of my heat gets out through the hull but also one 3kW webasto is more than enough to heat whole boat and keep it warm even in winter while it takes about 0.2l per hour of diesel.
How is it with RV ? i assume propane furnace should heat the unit ok, but what are the heat loses ? and if we go up north what we need to be prepared for ? mind you this will be probably next year and i will get more experience before that :-)