Rocket Stove Mass Heater. "heat your home with 80% to 90% less wood; exhaust is nearly pure steam and CO2 (a little smoke at the beginning); the heat from one fire can last for days; you can build one in a day and half; folks have built them spending less than $20"
Plancha Rocket Stove
ca me fait penser a la maison a latuque
rocket stove construction - excellent video on rocket stove mass heater - uses 55 gallon drum, reuses a hot water heater, and fire brick.