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Mend Boiler Pipe Shower

Does inc+ a pipe bore then dec- B4 an outlet benefit pressure or flowrate?

Does anybody know if in a bathroom from a combi boiler,when you've a 15mm incoming for hot&cold would it be beneficial to flow or pressure to increase to 22mm to mixer an back down to 15mm just before 15mm backplate elbow,therefore shower head\outlet???

rich
December 2009

D.I.Y, Plumbing Boiler Pipe Shower

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rich
December 2009

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Bathroom Plumbing: Pipe Size & Water Pressure