Hot water from cold taps

27 Oct 2012
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United Kingdom
Our house was built in 2000, and we've lived here from new. It has an unvented hot water system. Recently we've noticed warm or even hot water coming out of the cold taps for a minute when they are first turned on. This is a new fault, so it isn't caused by hot and cold pipes running too close. There are no header tanks, so it's not that they are heating up. I wondered whether the non-return valve on the cold feed had failed and hot water was expanding back into the street, but I've felt the feed pipe when the tap is run and it remains stone cold.

Any ideas please?
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