Viessmann 7828749 Flow Sensor / Vitodens 100-W WB1B 26kW 30kW 35kW CombiDescription Genuine Viessmann part number 7828749 a domestic hot water flow sensor designed for use in Viessmann Vitodens 100 W WB1B combi boilers. This sensor detects water flow demand when a hot tap is opened and signals the boiler to ignite and produce domestic hot water. It is a vital component for correct hot water operation and efficient boiler performance. The 7828749 flow sensor is commonly replaced when diagnosing faults such as intermittent

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