Generac's new Guardian Series 20kW backup generator, the industry's largest air-cooled 3-Phase generator available, provides small business with the best value per kilowatt available in the market today. Connected to your existing LP or natural gas fuel supply, it starts within seconds of sensing power loss - automatically - and runs for as long as necessary until utility power returns. Innovative engine design and rigorous testing are at the heart of Generac's success in providing the most reliable generators possible. Generac's G-force engine are purpose-build, capable of handling the rigors of generator use, resulting in power that more reliable and requires less maintenance than any competitive engine. All backed by 24/7/365 customer support and a nationwide dealer network of more than 5,000 strong, the best in the market.