Masonry heater. Takes only a few sticks of wood and heats for a day or two. And never needs chimney sweep.
The Masonry Heater Association Gallery
This beautifully styled cob bench and rocket mass stove is by Flemming Abrahamsson [www.fornyetenergi.dk] a Danish architect, stone mason and thatcher. Rocket stoves have very efficient combustion, where the furnace temperature ranges from about 1000C up to 1100C (not the place to keep a vase of flowers). Flemming's next cob workshop is on the 16th August 2012 in Stenlille, Denmark. Details, if you are free and in Denmark, are on his website.
Rocket Stoves.. Experimenters corner.. Answers questioned! - Six inch stove in tiny hut.