The Fire Sense Commercial Series Onyx and Stainless Steel Propane Gas Patio Heater (63009) is the most powerful patio heater on the market. With the output of a 46,000 BTU burner, it can operate for up to ten hours continuously on a standard 20-pound propane tank (not included). Constructed of stylish black powder-coated steel and stainless steel finish, this heavy-duty unit features a piezo ignition system and wheels for easy mobility. This superior patio heater is perfect for the serious outdoor entertainer. ETL approved.