Guardian 5506 20,000 Watt Air-Cooled Propane/Natural Gas Powered Home Automatic Standby Generator With Aluminum Enclosure (Discontinued by Manufacturer) Comes With Upgraded Load Shed Transfer Switch Clean, smooth True Power Technology provides safe operation of sensitive electronics. Patented Whisper Test feature makes the 20kW model as quiet as a car at idle during the weekly self-testing cycle. 35,470 Surge Watts/20,000 Rated Watts Non-CARB Compliant/Not For Sale In California