Generac 6437 Guardian Series, 11kW Air Cooled Standby Generator, Natural Gas/Liquid Propane Powered, Steel Enclosed, with 12-Circuit Transfer Switch (Discontinued by Manufacturer) Runs on Natural Gas or Liquid Propane and features hands-free operation with no manual start, no fueling, and no extension cords True Power Technology provides safe, clean and smooth operation of sensitive electronics Includes automatic transfer switch with 12-circuits protected (NEMA 1, indoor rated only) UL, CUL, and EPA Compliant for Safety 5-Year, Limited Warranty from Generac is included