"BillR" wrote in message
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The calculation is easy. 1 bar is approx 10m/30feet of water, so your 4+m
will give nearly 1/2 bar.
That may be adequate shower for many people but shower pumps usually
provide
a minimum of 1 bar.
Ceramic valves are better but in my experience you get hopless flow,
except
from bath taps, on gravity fed system in a first floor bathroom. I've got
the same type of monoblock tap in a downstairs toilet and in a 1st floor
on-suite. Downstairs its ok but upstairs its poor.

Thanks Bill. I've been looking at shower packs and separate heads/valves,
they don't seem to specify if they are ceramic valve, but they do specify if
suitable for high or low pressure(sometimes both), can I assume that the
high pressure only ones are ceramic and the low pressure aren't?

Martin