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The DHW non-return valve, also known as a domestic hot water check valve, prevents backflow in the hot water circuit of a boiler or heating system. This valve ensures that water flows only in the intended direction, protecting the system from contamination and pressure fluctuations. It is a vital component for maintaining safe and efficient operation of your domestic hot water supply. When replacing a faulty DHW non-return valve, you safeguard against potential damage and ensure consistent hot water delivery.