The HearthSense ventless infra-red radiant gas wall space heater operates on Natural Gas OR Liquid Propane and gives you 20，000 Maximum BTU of reliable supplemental heat that can heat up to 700 sq. ft of living space. This radiant heater features the latest advancement in vent free infrared plaque burner design which uses larger plaques to provide more heat per plaque. Operating like the sun， infrared radiant heaters provide instant direct radiant heat to people or objects in the room. This infrared plaque 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.