HW system, CH system clunking is the mains pressure ? ???

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10 Jan 2010
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Sussex
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Just want to run this past some of you experienced people.

The clunking we are hearing in our system is being considered as a mains pressure increase problem. This is what has been said;

The mains pressure is increasing, at times of low use in the street, and that is causing cold water to 'push passed' the bathroom tap valves and cause a backwards cycling of the hot water system.
This was diagnoses by running the mixer taps in the bathroom till the water was mixed / warm and then shutting off. The hot water pipe, on that tap, is then observed to cool faster than would be expected - according to the Heating Engineer.

Currently, we are living with it. Again the diagnostic "proof" is that if we run the mixer tap in the bathroom, the clunking will stop (which it does) for a while till the pressure causes the "push pass" the valve again.

This is a relatively new installation ~ 1year ish now and we've asked the pumber to "sort it".
Two questions to help me please;

1. is this approach, to diagnose the problem, a reasonable and reliable way to show that it is the water pressure causing the noise ?
2. If so, what to do about it ? the heating engineer is suggesting a mains pressure limiter ... we've gone to some effort to get a good mains pressure - it seems a bit silly to put a main pressure limitation device on it now.

Your opinions welcome.
Thanks
 
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