The Yamaha EDL21000DE Generator combines the high output power and reliability with the fuel efficiency of running it on diesel. Yamaha Diesel Generators provide continuous run time and outstanding fuel economy. This unit is perfect for industrial use or powering your entire home, including air conditioners, and refrigerators. Liquid-cooled diesel engine, with oil warning system (engine stops automatically when oil pressure has fallen below the prescribed level), has an easy on/off ac output with circuit breaker, and fuel gauge.