Comfort Glow Blue Flame Vent-Free 20,000 BTU Gas Heater for Indoor Use, Natural Gas/LP, 800 Sq. Ft. Heat, Electric Ignition, 99.9% Efficient The Comfort Glow Blue Flame Vent-Free Heater is a powerful and efficient propane or natural gas heater for indoor use, delivering 20,000 BTUs to heat areas up to 800 sq. ft. With dual fuel capability, this versatile natural gas heater or liquid propane heater provides flexibility for various spaces like homes, small garages, and offices. Its ambient blue flame is an effective heat source that also provides a relaxing focal point, making it 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. With compact dimensions (24.2" x 20.9" x 10.25"), it's the perfect propane wall heater for indoor use or natural gas heater indoor solution. Heater comes ready for wall mounting. Floor Mounting Kit (sold separately) also available to convert wall heater to a floor unit - Amazon ASIN B00S04XHC6. Liquid propane Gas Install Kit #20-7010 (sold separately) - Amazon ASIN B002URJHVY Additional blower (sold separately) available, Amazon ASIN B00S04X79O. Requires 120V Grounded Outlet and has Auto T-Stat Control. Fits all Kozy World and Comfort Glow Infrared models above 10,000 BTU's and produced in 2015 or later. Specifications: Heating Capacity: Up to 800 sq ft Fuel Source: Dual Fuel – Natural Gas (NG) and Propane (LP) Power Settings: 20,000 BTUs Safety Features: Safe watch pilot / ODS system, over pressure safety device Special Features: No electricity required, 99.9% fuel efficient, electronic ignition, t-stat heat control, dancing blue flame Dimensions: 24.2"H x 20.9"W x 10.25"D Warranty: 2 years WARNING - CALIFORNIA RESIDENTS ONLY: This product and the fuels used to operate this product (liquid propane or natural gas), and the products of combustion of such fuels, can expose you to chemicals including benzene, which is known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov