The 20 kW Residential Standby Generator is large enough to power heating and cooling systems, sump pumps, electronics and major appliances in an average-size home. It permanently attaches to the home outdoors and runs off of existing fuel lines that offer LPG or natural gas. The unit measures 26.2 inches tall, 47.9 inches wide and 32.3 inches deep in its maximum open position, with a polymer base that eliminates the need for a concrete mounting pad. The 20 kW model is available with or without an Automatic Transfer Switch that automatically transfers power from the utility to the generator. Kohler Generators. www.kohlergenerators.com