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The DHW inlet connection is a fitting that allows cold water to enter the domestic hot water (DHW) system of a boiler or water heater. This connection is essential for the proper flow of water into the heat exchanger, ensuring consistent hot water supply. Over time, the inlet connection may corrode or develop leaks, requiring replacement. It is a standard spare part for many heating systems and is often used during repairs or routine maintenance to restore proper function and prevent water damage.