no water in bathroom when kitchen tap is used

[bickyz]

dear all,
I have a combi boiler in the kitchen downstairs. While showering/using the basin/toilet flush/ if someone opens the kitchen taps the there is hardly a water coming out from the shower/basin.

Is this a problem with the piping or the boiler ? Is there anyway to resolve this ?

any help would be much appreciated, thank you

 

[kidgreen61]

You clearly have very poor mains water pressure/flow.

Is the stop tap fully open, do you have an old lead pipe supplying the house or generally live in area of poor water pressure?

 

[bickyz]

the mains stop tap is about 45% open;
with fully open, the water in the kitchen tap is coming with very high pressure even with the tap slightly open. The kitchen tap is about 1 feet away from the mains stop tap.

 

[Newboy]

You need to have a flow restrictor fitted to the cold supply to your kitchen tap and then open up the stopcock to allow sufficient flow to the whole house.