Stove or heater/furnace?
You can find solid burning
fuel heaters like the Dickinson posted above.
I'm not sure
I would want to hassel with the mess of getting the
fuel on board, storing it, and than cleaning the ash left behind.
It sounds attactive at first, but not for me.
We have a Dickinson propane heater. (Not that haveing a propane heater on board doesn't open up a whole nother debate)