I had an overhead rain shower installed....simple knob turn on/off and
hot/cold...cold water mains fed was okay coming out of shower head...hot was
dribbling out...so installed a salamander 1.5 bar positive pump...now the hot
over rides the cold even when the knob is turned fully cold...not sure why
pump is still running then...cant get a mix of hot and cold and it's too hot
to shower in...help

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for full context, visit https://www.homeownershub.com/uk-diy...m-1360460-.htm

Back feeding up the cold is all I'll say, you need to have some kind of one
way valve and some way to calibrate it I'd say.
Also don't use the Home Owners club for posting to usenet many helpful
people see so much dross from there they won't see your post. Try eternal
September and a proper news client.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

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"Martyn" m wrote in
message ...
I had an overhead rain shower installed....simple knob turn on/off and
hot/cold...cold water mains fed was okay coming out of shower head...hot
was
dribbling out...so installed a salamander 1.5 bar positive pump...now the
hot
over rides the cold even when the knob is turned fully cold...not sure why
pump is still running then...cant get a mix of hot and cold and it's too
hot
to shower in...help

--
for full context, visit
https://www.homeownershub.com/uk-diy...m-1360460-.htm

On Wednesday, 8 May 2019 17:14:04 UTC+1, Martyn wrote:

I had an overhead rain shower installed....simple knob turn on/off and
hot/cold...cold water mains fed was okay coming out of shower head...hot was
dribbling out...so installed a salamander 1.5 bar positive pump...now the hot
over rides the cold even when the knob is turned fully cold...not sure why
pump is still running then...cant get a mix of hot and cold and it's too hot
to shower in...help

sounds like too much hot pressure.

On 08/05/2019 17:14, Martyn wrote:
I had an overhead rain shower installed....simple knob turn on/off and
hot/cold...cold water mains fed was okay coming out of shower head...hot
was
dribbling out...so installed a salamander 1.5 bar positive pump...now
the hot
over rides the cold even when the knob is turned fully cold...not sure why
pump is still running then...cant get a mix of hot and cold and it's too
hot
to shower in...help

It sounds like you are trying to mix mains cold (at a fairly low supply
pressure) with hot from a pumped gravity fed cylinder.

The normal way to do this would be to take a low pressure cold feed from
the cold cistern to the shower rather than mains cold. Then use a shower
designed for low pressure operation. Alternatively a twin impeller pump
can be added to pump both sides.

An alternative would be to fit a venturi shower - these use the cold
pressure to assist the hot supply. Probably not going to work with a
soaker head though.

Other options would be replacing the hot water cylinder with an unvented
one that runs at mains pressure.



--
Cheers,

John.

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