Kozy World's 5 plaque Natural Gas (NG), 30,000 BTU thermostat controlled heater will heat a room up to 1250 sq. feet. Our high quality infrared ceramic plaques radiate soothing, direct, immediate infrared heat. This heater is 99% fuel efficient. It requires no duct work or other venting and includes a built in oxygen depletion sensor! The sleek design and neutral color fits any decor.