DIYbanter - View Single Post - Using 10MM pipe for bathroom and kitchen taps

In article ,
(Peter Charlwood) writes:
Just wondering if anyone has done this before and if there are any
potetial problems with doing it. Also i am installing a combi boiler
and was wondering what sort of pipe size i should use for the
shower/bath.

I would think 10mm would be to small for the shower/bath but doing
really want to go over 15mm due to space. what would be a reason for
having say 22mm pipe over 15mm.

I wouldn't want to use 10mm for a bath, although there's about 15"
of it doing my washbasin tap, and the flow is probably good enough
for a bath with good mains pressure behind it (and rather high for
a washbasin;-).

I would use 22mm for a long run from a header tank. I would avoid it
for a run to short use hot tap, as it will increase the amount of
cold water wasted waiting for hot to run through. When replumbing
my house, I swapped all the 22mm for 15mm as it's all mains water
pressure. None of the runs were long, but it did make a noticable
improvement to the time for water to run hot. Made no noticable
difference to flow rate.

--
Andrew Gabriel