Query about water pressure and pump

marko99

I'm in a duplex and have a pump installed to boost cold and hot water pressure (not kitchen cold water obviously). Recently, my kitchen cold water pressure has dropped but I assumed that this was due to external factors. However, I've noticed that the pressure goes back up to normal for a brief period immediately after the pump has been on (if someone has a shower for example).
I can't understand why this would happen - can anyone explain?

marko99

Nobody able to shed any light on this?

K.Flyer

Cold kitchen tap should be mains water and should not be affected by the operation of the water pressure pump.
In saying that, I have seen kitchen cold taps plumbed from the tank via the pump, so who knows.
With that in mind your description of what is happening is a bit confusing, probably best to get a plumber who is familiar with pumped systems to take a look at it for you.

antoinolachtnai

The pumped water system and the mains cold water system could be interconnected somewhere. This should not happen, but it might. Is there any appliance plumbed to both the hot supply and mains cold water supply?

One thing to check for is whether your cold water tank is overflowing. you will know if water is flowing out through the overflow pipe. If it is, this might indicate that the two systems are interconnected somewhere.

It would be worth isolating the cold tank and see if that makes any difference to the pressure at the tap. But this is probably into plumber territory.

marko99

Thanks guys, I'm pretty certain that the dishwasher and washing machine aren't on the mains water inlet as the pump kicks in as soon as either of them is turned on.

Bit of a mystery.....