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    Viessmann Vitodens 100 Combi Issue

    I have a 4 year old Viessmann Vitodens 100 Combi boiler feeding an unvented hot water system and underfloor heating system. My issue is with the hot water circuit. When the hot water system switches on in the morning and the boiler fires up there is distinct rattle/judder which lasts a second...
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