25,000 BTU (British Thermal Unit) heater requires no electricity. Standing pilot for increased safety. Circular design projects heat 360 deg (degree). Operates up to 17 hours on a single 20 Lb. (pound) propane tank. Quiet operation, odorless and clean burning. Factory installed Piezo igniter. Equipped with a thermo-electric safety valve to shut the gas flow off if the flame goes out. Cylinder sold separately. Check state and local codes for permitted uses.