Re: Header tank overflow problem
sealed heating system, gravity hot water.
as you have mentioned you have a mixer tap or shower mixer that is gravity hot mains cold that is getting back flow from cold mains to hot gravity.
you need to isolate each mixer tap etc to locate what one is at fault. then when located the faulty mixer install a check valve to the hot supply near to the faulty mixer to prevent happening again.
as for turning down your mains to the same flow as the hot water only reduces flow not pressure.
the only way to reduce pressure is a pressure reducing valve.
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