Generac QuietSource Series QT02224ANAX 22 kW Watt Liquid-Cooled Propane/Natural Gas Powered Standby Generator without Transfer Switch (Discontinued by Manufacturer) Automotive-style, liquid-cooled engine operates at low speeds for reduced sound output and longer life Runs on clean-burning natural gas or liquid propane Patented Quiet-Test low speed exercise mode Aluminum all-weather enclosures with RhinoCoat paint finish are corrosion resistant and ideal for salt-air coastal areas This item is CARB Compliant