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Opened up the bypass one more turn, have not had any banging noises since, holding my breath on that one. Have also fitted a new pump, the difference is quite noticable, very quiet. Thanks for your help guys

Bypass is upstairs with pump and hot tank, boiler is downstairs in garage. Hi - Lo stat not altered from summer to winter. Thinking of cleaning system out and putting some Sentinel X300 in, I have had rads off in the past for decorating etc but no signs of furring up or sludge. Could it be...

Bypass definately not shut, how far open should it be, and what else could be my problem?

what do I need to do with it?

Is that the one accross the pump

My CH makes a load banging noise just as the hot water gets up to temp. The noise comes from around the area of the pump and hot water cylinder. It always start at this time of year and hasn't done it all through the summer. It's as if there is air in or hot and cold water suddenly meeting each...