Keep your house heated with an indoor or outdoor Fire Chief Wood and Coal Burning Furnace. They are designed for maximum efficiency with a unique 360° Roller Grate and a Secondary Combustion Chamber. Each wood furnace is pre-wired for easy installation and has a thermostatically controlled blower for maximum heat output. They are constructed of heavy 7 and 10 gauge steel with cast iron front and rear baffles for strength and durability. Wood burning furnaces by Fire Chief are UL391 safety standard rated and save up to 75% of heating costs in a home.