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We moved into a 2 bed property 3 months ago, we had the heating replaced with an unvented system. The water pressure is good in all taps, the plumbers said that they increased the size of the pipe coming into the house to increase it further.

We had a new bathroom installed and now when the shower is on, the pressure is fine unless someone turns a tap on or flushes the toilet and then the pressure drops right off.

The plumbers have said they think it could be an issue with the pipes coming into the house and to contact our water provider. Not sure if this is correct as the pressure coming into the house (i.e. in the taps is really quite good). They have installed a big water tank as we plan on extending so that it can cope with the extension, but it seems pointless in having another bathroom if the water can't even cope with a shower and a tap being on, let alone 2 showers!!

Any advise please???
 
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