Small, portable wood stove for tent....or camper?

That radiator idea is awesome!

I knew someone who had a a tiny antique stove, built for coal but she burned wood in it, in a houseboat.

For modern stoves:

http://kk.org/cooltools/extremely-tiny-1/

http://cubicminiwoodstoves.com/collections/all

http://www.tinywoodstove.com/store/

Very broad price range!