Powerful standby generator uses a powerful Generac OHVI engine with full-pressure lubrication and automotive design to provide up to 20,000 Watts of power, enough to provide whole house protection. U.S.A. 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 sensitPowerful standby generator uses a powerful Generac OHVI engine with full-pressure lubrication and automotive design to provide up to 20,000 Watts of power, enough to provide whole house protection. U.S.A. 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 sensit... More Details! Generac Guardian Series 5875 20,000 Watt Air-Cooled Liquid Propane/Natural Gas Powered Standby Generator With Transfer Switch (CARB Compliant) , Lowest Price for Generac Guardian Series 5875 20,000 Watt Air-Cooled Liquid Propane/Natural Gas Powered Standby Generator With Transfer Switch (CARB Compliant) , Generac Guardian Series 5875 20,000 Watt Air-Cooled Liquid Propane/Natural Gas Powered Standby Generator With Transfer Switch (CARB Compliant) For Sale.