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Why does it matter if its a UK forum? You speak English don't you? This was the best forum I found online for boiler questions and answers. Besides I got exactly what I needed. Thanks mr.therm!!

I just purchased a new home that has vaillant boiler in it. This heats both the house as well as the hot water. I don't know anything about these and I was wondering if someone on here could help me with a question? I have 3 zones in my house with 3 room thermostats. How come if all 3...