Rinnai FC510P Vent-Free Fan Convector Propane Gas Space Heater Input Range 5,600 - 10,000 BTU/hr Ideal supplemental heating solution for room additions, basements, and sunrooms (Heating area varies by geographic region and location of install within the home) Simple installation - Designed to be professionally installed with ease in nearly any space With no vents or ducts, heat loss is minimized, making for a solution thats 99.9% efficient. A host of "always-on" safety features to protect your family: Tilt switch, Flame and power failure protection, and an Oxygen depletion sensor (ODS) that continuously monitors to ensure safe operation.