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The DHW tube, or domestic hot water tube, is a component used in combination boilers and water heaters to transport hot water from the heat exchanger to the taps. This tube must withstand high temperatures and pressure while maintaining a clean interior to prevent scale buildup and contamination. Over time, the DHW tube can become blocked or develop pinhole leaks, leading to reduced hot water flow or water damage. Replacing it with this specific tube restores proper hot water delivery and ensures the longevity of your water heating system. Typically made from copper or stainless steel, this part is designed for durability and corrosion resistance. If you are troubleshooting low hot water pressure or temperature fluctuations, consider inspecting and replacing the DHW tube as part of your repair process.