To tell the truth, I usually end up warming the cabin with the stove in the morning while making coffee... just the heat from boiling water is enough down to 50f or so.
Something like this will probably work fine.
Can it be mounted on a wall? er... bulkhead?
Although I suppose the best place to put it would be right on the stove, when I am not using the stove.
I did think about candles, or better yet, a W&P oil lamp. http://www.defender.com/product3.jsp?path=-1|65136|2312565&id=66103