I built then expanded the fire place heat exchanger here, Fire place heat exchanger | Survival Monkey Forums It works great but I'm still burning a ton of wood to heat 1 room, to keep it comfortable. I'm burning off up to 10lb of wood per hour. Burning that much wood, say in a wood stove could heat the entire house, not just one room. So something has go to to give, the fire place is nice but it's too inefficient. I think little wood stove with a blower and a rear exit stove pipe would be best. So I can set the stove back in the fire place and run the pipe up the flue, pack something like Rockwool around the stove pipe to flue gap. Being a wood stove it will work fine when the power goes out even if I don't power up the blower. Main problem is I can't find one I like. I would much prefer the wood stove. A pellet burner would be nice since it can go all night and actually regulate fuel burn rate and has a much longer fuel burn time. Plenty of small ones out there that are nice and would work but they are expensive and require electricity to run.