Ecofans are the genuine heat powered stove fans, designed to sit on top of a free standing wood, pellet or gas stove. The fan pushes heated air into the room, warminp those cold spots that would otherwise not be evenly heated. The Ecofan generates its own electricity from the heat of the stove using thermoelectric technology. It costs nothing to run and operates almost silently, even if the power goes out. The efficient heat distribution means you can also burn up to 18% less wood. 2 year warranty.