The Stationary Hot Water Generator Series heating modules offer the flexibility to €œconvert€ a cold water pressure washer into a hot water unit.  By attaching the heating module to a cold water pressure washer the pressurized water is now heated to produce all the benefits of hot water cleaning. The four models use fuel oil, diesel or natural gas to heat the water using high-efficiency, vertical heating coil. All models are equipped with a flow switch to control the burner.