Kohler Power System Generator Genset 20RESD is a standby power generator that runs on natural gas. It is manufactured by Kohler and has a model number of Kohler 20RESD. This power generator is designed to provide backup power to homes and outdoor spaces. The gentleman I received this from bought this new in 2015. He used it for his mountain home for about 1 year and then moved. He never hooked it up again. He said it always worked great. I am selling this as-is not working because I have no way to test it.