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Thanks for the reply. I have already turned the pump speed down to II from III but to no avail. All pipework appears well clipped.

System: Gravity Fed, Tower Mid Valve on CH/HW, pump below, modern system. Problem: When Tower mid valve moves over to HW it appears to 'overshoot' slightly and then move back and settles. When it 'overshoots' there is a loud pipe hammer banging. Water in header tank is warm. I was going to...