I have just had a Salamander pump put on my system adjacent to the hot water tank to increase the pressure on the shower. The pump appears to be connected correctly with the cold feed in from the cold water tank in the loft and out to the pipe that connects to the cold taps on one side of the pump. On the other side of the pump the hot feed comes in from the top of the hot water tank and out to the pipe that connects to the hot taps.
However, when the pump is running, the cold water tap is warm. After investigating further it seems that cold water tank in the loft is being filled up with hot water?!? Furthermore the toilet cistern is now overfilling also!
Grateful if someone could advise...
The plumber has said that it is because the cold water taps should be fed by a supply directly from outside?!? However I thought that it is only the downstairs taps that should be supplied from the outside main?
You presumably have monoblock mixer taps and these are allowing hot and cold water to be inter-connected when the tap is off. The problem with the loo is because you have a low pressure valve fitted.
Call the plumber back and get him to sort it, your only mains fed tap must be the one in the kitchen but any combination of other taps mains fed is quite common. Making your upstairs taps mains fed will lead to even more problems.
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