Generac 6244 20,000 Watt Air-Cooled Aluminum Enclosure Liquid Propane/Natural Gas Powered Standby Generator with 200SE Transfer Switch (Discontinued by Manufacturer) Includes 200 Amp automatic transfer switch for whole house protection Convenient, hands-free operation with no fueling. No manual start. No extension cords. Runs on natural gas or liquid propane Clean, smooth True Power Technology provides safe operation of sensitive electronics 20,000 Rated Watts. CARB Compliant Patented Quiet-Test low speed exercise mode