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. The Quiet-Test™ feature provides ultra-quiet operation during the generators weekly self-testing period. Models run on natural gas or LP gas. UL listed. U.S.A.Engine 1.6 Auto-Style Engine Displacement (cc) 1,600 Speed (RPM) 3,600 Rated Watts (kW) 25 Rated Watts LP (kW) 25 Rated Watts NG (kW) 25 Volts 120/240 Amps 104.2, Engine Cooling Liquid Start Type Automatic Phase 1 Noise Level (dB) 60 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 Additional Product Specs * 25 kW liquid propane * 24 kW natural gas * Bisque enclosure * Ultra-quiet operation — Quiet-Test™ feature for quiet operation during self-testing * Automatic safety shutdowns and exerciser * Safe design