Comfort Glow 12,000 BTU Gas Heater for Indoor Use, Infrared Radiant Vent-Free, Natural Gas/LP, Thermostat, 400 Sq. Ft. Heat, Electric Ignition, 99.9% Efficient. This Comfort Glow Infrared Radiant Vent-Free Heater is a powerful and efficient propane or natural gas heater for indoor use, delivering 12,000 BTUs to heat areas up to 400 sq. ft. With its dual fuel capability, this heater has the flexibility to operate on natural gas or liquid propane and is ideal for various spaces like homes, small garages, and offices. Its radiant infrared heat warms like the sun, using 2 high-quality ceramic plaques which provide direct, immediate warmth to people and objects in the room. It is a reliable space heater that operates without the need for electricity. This ventless gas heater is 99.9% fuel efficient and simple to install, requiring no external vents. Equipped with safety features such as an Oxygen Depletion Sensor (ODS) and over-pressure safety device, it offers peace of mind. The built-in thermostat allows easy heat control, and the electric ignition ensures hassle-free operation. Its compact size is the perfect heater for your indoor heating needs. The heater comes ready for wall mounting. Floor Mounting Kit also available to convert wall heater to a floor unit. Our optional blower is a great way to spead air throughout the room. It requires a 120V Grounded Outlet and has Auto T-Stat Control. Fits all Kozy World and Comfort Glow Infrared models above 10,000 BTU's, produced in 2015 or later.