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It’s a Viessmann Vitodens. I don’t think we have that set up though but can check this evening.

Good evening, I had a new combi boiler installed in my First floor flat in Jan this year. Since then I have noticed the boiler coming on and firing up like it does when providing hot water but when we aren’t using water at all, for example, arriving home into the flat when no one is in. I have...