Higher wattage requirements need larger generators. Generac GUARDIAN® Series liquid-cooled models provide whole house backup power and are available for larger residential and light commercial applications. Models run on natural gas or LP gas. RTS transfer switch sold separately. UL listed. U.S.A. Rated Watts (kW): 25, Engine Displacement (cc): 1,600, Engine: 1.6 Automotive, Speed (RPM): 3,600, Rated Watts LP (kW): 25, Rated Watts NG (kW): 24, Volts: 120 / 240, Amps: 104.2 LP / 100 NG, Engine Cooling: Liquid, Start Type: Automatic, Phase: 1, Noise Level (dB): 74 @ normal load, 62 @ exercise, Transfer Switch: Not included, Fuel Type: Natural Gas or Liquid Propane, Enclosure: Steel, 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 Steel enclosure in Bisque In-line 4-cylinder engine Automatic safety shutdowns and exerciser Safe design CARB compliant 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. Generator sales are final.