Briggs & Stratton 40248 7000-Watt PowerNow Dual Mode Air Cooled Home Standby Generator Flexible Power Options: The included propane quick-connect kit gets you back up and running immediately, with the ability to upgrade to permanent backup power when convenient. Hassle-free fueling: runs on clean and readily available propane or natural gas; eliminates waiting in long gas lines and the need to store and pour gasoline Longer run time: get up to 12 hours run time (at load) with only two 20-Pound propane gas grill tanks Quiet operation: The fully enclosed compartment features engineered air passages, a lo-tone muffler and acoustic foam dampeners for 50-Percent quieter operation than most portable generators Non-CARB Compliant/Not For Sale In California