Permissible water temperature islimited by materials of construction and type of ion exchanger. Temperature of water entering the unitshould not exceed that recommended by themanufacturer. If the treated water passes directlyinto a water heater or other heat-producing apparatus,a swing-check valve must be installed in theline to prevent hot water from backing up into the demineralizing equipment. A pop valve should bebetween the check valve and heater to protectdemineralizer tanks.
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