Liquid-cooled generators are designed for homes or light commercial applications with larger electrical loads or for those requiring a generator with more features. Each generator is equipped with engine, generator, radiator, muffler, block heater and controls. The unit's muffler is tucked into the enclosure for a sleek design, and directs the engine's heat upwards to protect closely-located vegetation. A liquid-cooled generator requires professional installation to insure natural gas pressure of 5-7 inches of water or LP vapor pressure of 11-14 inches of water.