The HAWS AXION 9400 Steam Water Heater replaces hot water tanks when pressurized steam is available. When an emergency shower or eyewash is activated, the flow of water opens a steam control valve. The steam enters a brazed plate heat exchanger, instantly heating the water. The unit conforms to ANSI Z358.1 tepid water requirements. An ASSE 1071 certified mixing valve blends hot and cold water to produce an output of 80° F (27° C) tepid water. Additional valves keep the system preheated, freeze protected and scald protected. The steam valve will remain closed should there be a loss of water pressure.