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Hi, just had a grundfos 3 bar,twin impeller, negative head fitted for my house. Just a question on its operation. When the cold water is only being pumped, the hot water end of the pump is getting extremely hot. Is that normal?

Hello, I have a problem with the water pump in my house. It is used for taps, flushing toilets, and shower. The cold water mains tap does not use the pump. The pump used to switch off when the above were turned off but now it stays on all the time. I have to turn it off at electric mains...