We got an extension built just over a year ago and it included an ensuite
with an Aqualisa Quartz pumped shower. The cold pressure in the ensuite taps
has always been poor. I have only just discovered the main stopcock has been
left 3/4 closed, I presume by the plumber when he was plumbing the ensuite,
and when you open it fully the pressure in the ensuite taps is OK. I wonder
if this was a quick way of equalising the pressure in the cold and hot feeds
for the shower and is there a proper way of achieving the same thing (i.e.
some kind of pressure reduction device)?
If it's a power shower, the cold should be pumped and taken from the cold
water storage cistern, so it shouldn't matter about the main stopcock.
Sounds like your cold feed is coming straight from the mains and not a
cistern. Maybe it isn't even pumped...
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