Generac Guardian Series 5744 20, 000 Watt Air Cooled Propane/Natural Gas Powered Home Automatic Standby Generator With Transfer Switch (Discontinued by Manufacturer) 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. Patented Quiet-Test low speed exercise mode Includes 200 Amp automatic transfer switch for whole house protection 20,000 Rated Watts. CARB Compliant.