I've a downstairs shower in a room with a gravity-fed hot and mains
cold. The electric shower has given up the ghost, and I always thought
that the only alternative was a venturi; but I see that Screwfix have
what they call a "Pressure Balancing Mixer Shower" (see
http://tinyurl.com/yccbecj for the Screwfix page) which can handle
pressures from 0.5 to 5 bar (main here is about 2.5-3). Would that be
appropriate for this shower, and what performance can I expect? I should
say that I'd like a shower which can provide pure cold at reasonable
pressure as well as a hot shower (at present I have the former only:-).
Grateful for advice.
Douglas de Lacey
My guess would be that with that shower you get the lowest common
denominator i.e. it reduces the higher pressure to that of the lower.
So not that useful for your situation.
If your hot pipework is up to it (i.e. 22mm right through from tank to
shower, and not too tortuous a route), go for a venturi. It's the one
that *will* give you a decent shower from low-pressure stored hot
Otherwise go for pumped.
I'd avoid the venturi not least as it means a lot of pipework changes.
The stored hot water has to be at least 60c to get a useable shower.
At least it did on the one I used a few years ago. Electric showers
are cheap. Homebase have a 15% weekend on and I've seen branded makes
there as well as their own brand.
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