3-way valve assembly De Dietrich 7770000

The 3-way valve assembly is a key hydraulic component in many combination boilers and heating systems, responsible for directing the flow of hot water between the central heating circuit and the domestic hot water circuit. This motorized valve ensures that your system can switch between heating and hot water modes as needed. Over time, the valve can become stuck or leak due to debris or wear, causing loss of heating or hot water. Replacing the entire 3-way valve assembly restores proper flow control and system efficiency. It is a common spare part for boiler repairs and maintenance.