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Hot water coming through cold tap at 16 degrees

Posted: Sun Mar 07, 2021 9:37 am
by pipefitter
fitted new heating system boiler and heat exchanger

new pipe work to about 12 sinks some fitted with blending valves

first thing in the morning when i run cold tap
hot water at 16 degrees comes through for about 5 mins

pipework is lagged
pipework is not crossed

any ideas