Water Cooler is designed to accompany Newarcs range of power sources to provide the ability to water cool the welding torch during welding. The power source units can be fixed on top of the cooling unit and provide the power to the CU20 creating one water cooling capable unit. The CU20 has an inbuilt flow sensing system that checks that the water is flowing correctly and shuts down the machine if a fault is detected protecting the torch and CU20 from damage.