Might just be badly-/un-lagged pipes running very close together, causing the hot line to transfer heat to the cold...In which case relag/reposition.
Alternatively, if the boiler's running too hot and overpressurising the system, the hot water could be escaping into the cold pipes.
Probably best to install an expansion tank and/or fit new one-way valves in that case.
...or he's plumbed the hot pipe in. :D
*suddenly overly and quite unnecessarily concerned for the protagonist of the joke* :S
(Alternatively, if the boiler's running too hot and overpressurising the system, the hot water could be escaping into the cold pipes.
Probably best to install an expansion tank and/or fit new one-way valves in that case.
...or he's plumbed the hot pipe in. :D
*suddenly overly and quite unnecessarily concerned for the protagonist of the joke* :S
kitaro is all, like, "Nifty Biscuits" 'n that...,
Sat 6 Jun 2015, 21:45,
archived)