Slow-Speed Kohler 5,500 Watt Propane/Natural Gas Generator - This innovative, slow-turning generator (longer life, better fuel economy!) is suitable for standby or continous use and has plenty of power to run your home, job site or business. This unit features a 15 HP Kohler Commnad CH15 engine and with its slow-speed design (only 2200 RPM!) has lower sound levels, bettery fuel economy and longer service life then the higher-speed (3600 RPM) alternatives. This unit is propane and natural gas fueled and features a cast iron cylinder liner, hydraulic valve lifters, electric starting, low oil pressure shutdown, full pressure lubrication w/ spin-on oil filter, critical-type exhaust silencer, brushless generator head (maintenance-free!), dual element air filter w/ foam pre-cleaner, easy access oil fill/dipstick, two year warranty, steel skid base w/ vibration isolators for low noise and vibration and a sound level of only 73 dB(A).