The 20kW1 DX generator is there when you need it most, providing more power on both natural gas and liquid propane than any other generator in its class. The workhorse of the PowerProtectDX lineup, the 20kW unit is backed by the most comprehensive warranty over time with a 10-Year limited warranty. This residential standby generator contains an engine and AC power generator, uses a Vanguard M61 OHV two-cylinder engine with an aluminum block and cast iron sleeves, 120/240 VAC, 100 Amps (generator breaker), 60 Hz, 20-kW running power, and 20-kW standby power.