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Much appreciated, many thanks! By my calculations, if the table on the top right is the minimum: Wash basin: 2.7 lt/min to 5.4 lt/min Shower: 5.4lt/min Is this correct? Also, is there any provision for multiple taps running at the same time?

Can someone with access to the NHBC standards let me know of the minimum water flow rates for a single outlet and/or mutliple outlets at the same time, assuming there is provision within the book for this. Many thanks! :-)

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The taps require a minimum of 0.5 bar of pressure according to the manufacturer's website. Is there any way to accurately measure mains pressure?

Quite right. Oddly enough, all upstairs are poor apart from the bathroom filler, which is fine and visibly better than any others. Then again, its about 30-40cm lower than the basin taps. Having said that, cold is slightly better than hot throughout the house.

I think I am starting to understand the installation a lot better. Taps are upgraded mixer type, the builder has said that its is possible that they are at fault, and have escalated to the manufacturer for advice. I will try to find the technical drawing and info on minimum pressure...

The builder knows in no uncertain terms that we are not happy. Unfortunately, although the pressure is not to fully pumped levels, the flow rate from all outlets conforms to their minimum which is 4ltrs/min. I intend to challenge that as once a second outlet is opened, the flow rate is dropping...

Bit of background: We have purchased a newbuild property which comes with a gravity fed hot water system and a pumped central heating system. Bear in mind I am a complete plumbing novice, and this is my understanding from my research online and by asking other people. The boiler is an IDEAL HE...