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  1. Goo2088

    Viessmann vitodens 100 W

    Hi We recently bought a house with a 5 year old viessmann vitodens gas boiler. We have never really got to grips with it... the manual timer doesn't seem to work and we have to manually turn the heating/hot water on and off using the dials. Last winter we had the hot water set at the factory...
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