The US Stove Miracle Heat Blower is compatible with wood or coal stoves and furnaces and is designed to improve the efficiency of an older stove or furnace. This blower features an integrated thermo disk that senses the heat in the chimney and once hot, blows air through the heat exchanger to bring up to an extra 10 percent of the heat loss back into the room. Easy to install into a 12 inch section of the stove pipe just above your stove, this blower is ultra quiet and has fully automatic operation.