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@Picasso: Thank you, the system is 3 months old from new. I'm waiting for a water pressure gauge to arrive so I can check my water pressure, and will need a plumber to check the expansion vessel by the sounds of it. @Madrab: Thank you also, Yes we are talking about the hot water system (the...

Apologies for asking a question which has probably been asked a hundred times (Google search didn't filter for me what I was looking for), and for not having basic physics knowledge, but... If I lower the flow at the mains outside (Thames water installed stop cock) outside my property...