Ideal for applications that require ultra-quiet operation and exceptional fuel economy. Achieves greater power output with less effort, resulting in significantly reduced fuel consumption both during exercise and under full load. Features aluminum enclosures for extra corrosion protection in coastal areas. Runs on natural gas or LP gas. UL listed. Transfer switch sold separately.Engine 2.4L Engine Displacement (cc) 1,600 Speed (RPM) 1,800 Rated Watts (kW) 22 Rated Watts LP (kW) 22 Rated Watts NG (kW) 22 Volts 120/242 Amps 91.6 Engine Cooling Liquid Start Type Automatic Phase 1 Noise Level (dB) 70 Fuel Type LP or natural gas Enclosure Aluminum Mounting Pad No Battery Required Yes Battery Included No Auto Shutdown Yes UL Listed Yes Dimensions L x W x H (in.) 62.2 x 29 x 33.5 # 22 kW liquid propane # 22 kW natural gas # Aluminum, corrosion-resistant enclosure (Gray) # Quiet-Test feature for near-silent operation during self-testing; 50% quieter than competitive models # Generac industrial liquid-cooled in-line 4-cycle engine # Automatic safety shutdowns and exerciser