http://www.zodi.com/

I came across a link to this company on someone's Vanagon links page. Check out the combo units, but they have dedicated water heating units and space heaters. The water heaters can be put on a stove, or they have propane ones.It seems like a great solution to both hot water needs and space heating needs. It is portable, so it doesn't have to be carried around when not needed. They have a combination unit, which heats water for showers and dishes, and also is a space heater, with two ducts to put in your tent or Westy. The good thing is that the combustion chamber can stay outside, and it can either heat inside air or draw in fresh air from outside. I might get one and either build a small shelf to hang it on outside the window over the sink, or use it on the roof luggage area, and make a small window within a window to bring the ducting inside.

Has anyone tried one?

Ed