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. Engine Speed (RPM): 1,800, Engine: Guardian Quiet 4.2L, Engine Displacement (cc): 4,200, Rated Watts LP (kW): 48, Rated Watts NG (kW): 48, Volts: 120/240, Amps: 200, Engine Cooling: Liquid, Start Type: Automatic, Phase: 1, Noise Level (dB): 65, Fuel Type: LP or natural gas, Enclosure: Aluminum, Mounting Pad: No, Battery Required: Yes, Battery Included: No, Auto Shutdown: Yes, Low Oil Shutdown: Yes, Safety Alerts: Yes, UL Listed: Yes, Dimensions L x W x H (in.): 77 x 33.5 x 46, Rated Watts (kW): 48 48 kW liquid propane 45 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 V-6 engine Automatic safety shutdowns and exerciser Standby generators require installation involving permanent outdoor placement, electrical wiring and fuel source connections. We recommend the use of a trained professional for final connections of gas and electric.