Briggs & Stratton 40226 20,000 Watt Home Standby Generator System Liquid Propane Version 20,000-watt liquid propane standby generator powered by Briggs & Stratton 993cc Vanguard Big Block V-Twin Patented computer-controlled technology for optimal efficiency Enough power to run two 5-ton central air conditioners Measures 48-by-33-by-30-1/2 inches (LxWxH); weighs 600 pounds; 4-year warranty