Hello there,I am about to run a new supply to a bath filler in my bathroom (it's at the opposite end of the bath from the new side body taps I have just bought). There are 22mm branches under the bath for this supply, which a plumber made some time ago. Should I use 22mm pipe and flexis etc from these, or would 15mm give an adequate flow from the taps to the filler (with reducers where necessary)? I have a combi boiler supplying the hot water.Thanks in advance,Michael
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Hi my name is Brian,I have been in the Plumbing & Heating trade for approximately 15 years,lets see if i can help. If your running a combi boiler then 15mm will be fine as you will not get anymore flow than the boiler will give.