Generac Guardian Series 5887 20,000 Watt Air-Cooled Liquid Propane/Natural Gas Powered Standby Generator Without Transfer Switch (CARB Compliant) (Discontinued by Manufacturer) Convenient, hands-free operation with no fueling, no manual start, and no extension cords Runs on either liquid propane (20,000 watts) or natural gas (18,000 watts) Clean, smooth True Power Technology provides safe operation of sensitive electronics Aluminum enclosure; 3-year warranty; transfer switch sold separately CARB Compliant