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Its a newly installed combi worcester bosch greenstar 40cdi and its meant to have 16 litre permi flow.

SO I understand I will loose some flow but the pressure will remain the same. Does anyone have any commnets as to whether or not the 20mm pipe will loose performance over 25mm when using the shower. Im installing a Mira excel

OK next question is can anyone inform me what the diameter of the exsting lead pipe might be.

OK guys, the severn trent inspector is a bit of a anorak and hasnt insited with the builders that it has to be all 25mm. He is letting the builders get away with it and has asked for the end that they connect to be 25mm in so therefore a joint needs to be made from 20mm to 25mm. The lenght...

I am replacing the lead supply but the builders have installed 20mm pipe instead of the 25mm recommended by the water authority. The switch over has not yet been done and we have had installled a new combi boiler worcster bosch 40 cdi running on the exisitng lead supply. The mains pressure on...