Check out this link. Dickinson stoves are the standard for fish boats on the west coast. Growing up on the water and working off fish boats for many years when I was hard hat diver I never saw a boat without a diesl stove. Very safe, cheap to run. I have seen several installed in old school bus motorhomes and they worked great.
Dickinson makes some realy nice units for pleasure craft that not only work great but look good. I have an old all polished model that is going in my hunting cabin latter this year so the place is nice and warm after a long wet day on the river.
They make heat that feels like wood heat, which is a nice warm soft kinda heat, nothing better on a cold wet west coast day.
http://www.dickinsonmarine.com/