Bath Pipe Work - What Size Pipes Should They be?

Postby paultoolbox » Fri Mar 21, 2014 1:24 am

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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Simply Build It

Postby proptech » Fri Mar 21, 2014 1:37 pm

Hi Paul
On a tank fed system the supplies to the bath taps would normally be in 22mm. Supplies to basin and toilet reduced to 15mm.
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