Fully automatic standby generator features Whole House Comfort, supplying enough power to manage two 5-ton air conditioners in addition to essential household power needs. The Vanguard big block engine boasts the smallest fuel consumption/foot print in its class. Engine Vanguard: 993cc. Rated Watts: 20 kw.Rated Watts LP: 20 kw.Rated Watts NG : N/A kw.Surge Watts NG: N/A kw.Noise Level : 68 dB.Fuel Type: Liquid Propane. Battery Required: Yes. Battery Included: Yes. Safety Alerts: Low Oil, Fail To Start, Low Frequency, Engine Overspeed, Low Voltage, Low Battery Voltage, High Oil Temperature, Transfer Switch Fault. Dimensions L x W x H : 4 x 33 x 30.5 in.Synthetic oil in the crankcase.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.