Flow restrictor 8L Viessmann 7825538

Water flow limiter (stabilizer) 8 liters — original component of the domestic hot water (DHW) system of Viessmann gas boilers. This part is a device for mechanical flow stabilization. It is installed in the DHW circuit to ensure a fixed water flow rate during heating, regardless of pressure fluctuations in the water supply network. As a result, the hot water temperature at the tap becomes stable: it will not drop sharply when a second tap is opened or when pressure surges occur in the main line. Technical specifications Part numbers: 7825538, 956.541.001 Manufacturer: Viessmann (Germany) Type: Water flow stabilizer (limiter) Flow rate: 8 l/min Weight: 0.1 kg Application: DHW circuit in Viessmann boilers Compatibility and signs of malfunction This flow limiter (Wassermengenbegrenzer) is intended for Viessmann gas boilers equipped with a DHW heat exchanger. The exact list of compatible models should be checked against the documentation for your boiler. However, it can be determined that this part is typical for boilers where precise flow stabilization is required. Malfunction of this element usually consists of clogging, breakage of the spring mechanism, or loss of elasticity of the seals. Replacement is required when the following symptoms are detected: Unstable hot water temperature: The temperature at the tap "jumps", becoming either hot or cold. Reduced pressure: Water pressure in DHW mode has dropped, even when other taps in the house are closed. Boiler does not enter DHW mode or shuts off: When the tap is opened, the boiler does not start or starts and immediately goes out due to insufficient or excessive flow. Replacement recommendations When replacing this part, it is strongly recommended to: Check the condition of the cold water inlet filter