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Hello all, I was sure that I would find an answer to this on the web somewhere (quite possibly on this site). However, so far I have not. Silicone sealant is nowadays used universally to seal around uPVC doors, windows, etc. However, certainly when I have used it, no matter how carefully I...

We have recently moved into a house equipped with this boiler. When the boiler is working quite hard (eg CH is recently turned on and heating up), turning on a hot tap results in a very distinct bang and vibration through the pipework. Once the boiler has changed to DHW mode, it operates without...