This Hot Water Electric Pressure Washer is diesel heated. It has been a flagship for more than a quarter of a century, and now has patented Cool-Bypass* technology that limits temperature buildup in the pump during periods of inactivity, prolonging the life of the equipment. Another innovation introduced to an already long list of features is Snap ‘N Go kits, which allow easy upgrades to time delay shutdown, wireless remote operation, or auto start-stop.