o.k. fair point, I want to heat a 35 footer, and yes at present it is based in Scotland, near Inverness and again it will be over the next winter. I can get second- hand eberspacher out of a truck breaker,and yes they can be problematic and you do have to watch the battery useage for sure. It may be the easiest system for me though I don't know where to put the exhaust, I suppose I would have to cut a hole through to the cockpit??? Not an idea that I like.

I would prefer a stand alone and 'stow away' method if at all possible but obviously a gas heater gives off fumes and eats through gas bottles. It's only the cabin heating that's the problem as I have water heating via calorifier.