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. For use on construction sites, industrial and commercial workplaces, agricultural buildings, workshops and remodeling jobs.