The Patio Comfort (PC02AB) 40,000 BTU Infrared Propane Gas Portable Patio Heater features a commercial-grade aluminum construction with antique bronze finish, 34 inch one-piece anodized aluminum reflector, up to a 10-15 foot radiant circle of heat, stainless steel infrared burner that emits 40,000 BTU's of heat, stainless steel fasteners, convenient push-button piezo electric ignition system, oxygen depletion sensor (ODS) that will shut the unit off if there is inadequate oxygen in the area, auto-off tilt protection that will shut the patio heater off if it is tilted over 30 degrees, and safety pilot system to stop the flow of gas if the burner goes out. This standing tower heater is totally self-contained and operates up to 10 hours on high. The unit requires a 24-inch clearance from the top and sides and includes wheels for easy portability. For outdoor use only. UL approved. All Patio Comfort patio heaters are shipped in TWO cartons: one carton contains the patio heater, the second carton contains reflector.