cold water problem

[golfing]

I would appreciate any help on the following problem.

I am a maintenance fitter working within a number of care homes, just recently most of the cold taps within one of our homes have been passing hot water, most of the cold water taps are tank fed and there are quite a number of thermo mixer valves installed

 

[Agile]

I dont think that there is any immediately obvious cause that we can suggest to you on the web.

I would have expected that feeling the cold water supply pipes back from the taps will easily lead to the cause of the problem.

You imply that some taps are mains fed. But you dont make it clear if this is a problem with both mains and cistern fed taps.

I presume that this is an ongoing warm water and not just the cold pipe getting warmed when there is no demand overnight by adjacent hot pipes?

Tony

 

[ChrisR]

Presumably the hot comes from the same head as the cold - is it the same tank?
COuld one/some of the mixers be letting water go backwards up the pipe, so they fill with warm water? Obviously needs a difference in head.
CW pipes touching hot over long run?

ummm... !!

 

[Rob]

have you checked to see if the water in the CWSC is hot, if not you know it picks it up on the way?

 

[bab]

could be a few different reasons. Check to see if cold water storage cistern is warm. If a cylinder is overheated it can pass up the cylinder cold feed to warm the tank, this will also happen if the cylinder vent is under the water level in the header tank causing a thermal syphon action. Or if the cylinder cold water tank is higher than the cold water tank feeding the cold taps & one of the blending valves on the basin has a non-return valve faulty or blocked open letting the hot pass up the cold.Have come across this before.

 

[Nige F]

With due respect to you ....Get the tightwad owners to call a heating engineer/plumber ..........My Mrs. has had 30+years experience of NHS and care homes and I`m an old school plumber You have my sympathy in your job