Mr. Heaters 30,000-BTU Vent-Free Blue Flame Natural Gas Heater uses natural convection to circulate warm air throughout your favorite living space, keeping you comfortable while fighting back against your winter heat bill. Legs and mounting brackets allow you to install it permanently to the wall or anchored to the floor where you can use the thermostat to easily control the temperature in your room. Simple-to-use battery-powered ignition starts the natural-gas-powered heater so you can warm a room up to 750 sq. ft. Oxygen Depletion Sensor (ODS) ensures safe operation. Should be used at elevations lower than 4,500 ft. Compatible with a blower fan (not included) to move heat to other areas of the home. Manufacturers limited one-year warranty. 23.75L x 11.25W x 27H. Wt: 26.75 lbs. Type: Heaters.