Generac QuietSource Series QT02516 25,000 Watt Liquid Cooled Propane/Natural Gas Powered Home Automatic Standby Generator (Discontinued by Manufacturer) Powerful 25,000-watt standby generator with automotive-style, liquid-cooled engine Runs on clean-burning natural gas or liquid propane Patented Quiet-Test low speed exercise mode Tough, RhinoCoat paint finish for unmatched durability and all weather protection. This item is CARB Compliant