Comfort Glow Blue Flame Vent-Free 20,000 BTU Gas Heater for Indoor Use, Natural Gas/LP, 800 Sq. Ft. Heat, Thermostat, Electric Ignition, 99.9% Efficient. This Comfort Glow Blue Flame Vent-Free Heater is a powerful and efficient heater that operates on natural gas or LP. It's for indoor use and delivers 20,000 BTUs that can heat areas up to 800 sq. ft. With dual fuel capability, this versatile heater provides flexibility for various spaces like homes, small garages, and offices. Its ambient blue flame is an effective heat source that provides a relaxing focal point, providing clean, convective heat which is the best for quick, whole room heating. It is a reliable space heater that operates without the need for electricity, making it the perfect heat source even during power outages. This ventless gas heater is 99.9% fuel efficient, meaning all the heat remains in the room. Zone heating can save you up to 30% on home heating costs. It is simple to install, requiring no external vents or chimney. The Oxygen Depletion Sensor (ODS) and over-pressure safety device provides added safety. The built-in thermostat allows easy heat control, and the electric ignition ensures hassle-free operation. Its compact size makes it ideal when wall space is limited. This heater includes the mounting bracket for wall mounting, but an optional Floor Mounting Kit #20-5345 (sold separately) will convert the heater to sit on the floor. If installing to LP, a Liquid propane Gas Install Kit #20-7010 (sold separately) is available. It includes a 1/2" gas flex connection, 3/8" & 1/2" adapter fittings and pipe sealant. If you desire to move more air throughout the room, a optional blower #20-6127 (sold separately) is also available. Blower requires a 120V Grounded Outlet and has Auto T-Stat Control. Will fit all KozyWorld and Comfort Glow Infrared models above 10,000 BTU's, produced in 2015 or later.