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  1. Ferdinand
    Not really sure if this is sufficiently boffin-y. However... I am currently having my upstairs bathroom redone, and when we exposed the pipes supplying the whb, it turns out that the Hot is a 22mm pipe, and the Cold is a 15mm. This was built by a self-builder, and we were trying to fathom why this might be the case. My fitter commented that making it 22mm would probably result in a slower supply of hot water, and mentioned the Venturi effect. Plumbing and fluids not being my thing, can someone supply an explanation as to why this is the case (or a link), and why he may have done it? One impact of the new bath I have installed in addition to the shower is that there is now backwash up through the plughole of the downstairs shower (which has replaced a bath) and it now needs a non-return valve. What fun. Cheers F
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