Here's my delemma , heating just 1000 sq.ft . of fairly well insulated space doesn't call for a large stove , even up here in Maine . I can easily heat my space with a 1.7 cubic ft. firebox but only get about 4 hours of heat . I'd like to get longer burn times but a larger stove that would burn longer would roast me out of the place . Any such thing as a small to medium stove with long burns times ?