The Hearth Sense ventless blue flame gas wall space heater operates on Natural Gas OR Liquid Propane Gas and gives you 30，000 Maximum BTU of reliable supplemental heat that can heat up to 1，000 sq. ft of living space. Blue flame vent-free gas space heaters are clean burning， fuel efficient and safe to use. This gas heater works much like a central heating system in that it heats the air in the room by circulating warm comfortable air throughout the room. This blue flame cabinet heater is equipped with a thermostat which allows you to maintain and control the desired room temperature. The easy push-button ignition makes it simple to start while the oxygen depletion sensor features an automatic shut-off design to keep your home safe. This heater can be mounted to the wall or the floor with the included mounting brackets and hardware. No electricity is required which is perfect for keeping you warm during power outages. A great additional feature， this heater includes a pre-installed blower which helps spreads warm air throughout the room. The blower has 2 operating modes， thermostat and manual. In the thermostat setting， the blower will cycle on and off automatically as it senses heat from the heater. In the manual mode， you can choose from either on or off settings. The blower requires standard 120-Volt household current but if the power goes out， your heater will still operate without the blower.