hi been doing diy plumbing for some years now in many cases when i have removed old baths there have been 15mm pipe work to bath then then 15mm to 22mm to taps so i have always did the same a few week ago i installed one for a friend i run 2 15mm pipes to bath then added 15mm to 22mm reducers last 2 foot or so is 22mm never seen a problem with this until my friend informed me it should all 22mm ? water flows great no problems ( airing tank system ) i believe combi boilers require 15mm ? bye paul
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