There is a service valve attached on the inlet pipe to the shower pump. This is on the hot water pipe you refer to and I have shut this but the overflow continues.
Overflowing from Cold Water Storage Tank
- Thread starter zayd
- Start date
There is a service valve attached on the inlet pipe to the shower pump. This is on the hot water pipe you refer to and I have shut this but the overflow continues.
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G
Goldspoon
That only rules out the shower... no other mixers in the house.
There is a basin mixer in the bathroom and a sink mixer in the kitchen. I thought this hot water service pipe supplies all hot outlets in the house.
G
Goldspoon
Water leaves cylinder.
Water goes past iso valve (which can be switched off for testing).
Water travels via pipe to shower pump.
Water travels to basin mixer and sink mixer.
Then shower pump is also pumping basin and sink and I'm lost for now.
Water leaves cylinder.
Water then branches off to basin mixer and sink mixer.
Water then goes past iso valve (which can be switched off for testing).
Water then travels via pipe to shower pump.
Then it can be the basin/sink mixer causing problem.
Water goes past iso valve (which can be switched off for testing).
Water travels via pipe to shower pump.
Water travels to basin mixer and sink mixer.
Then shower pump is also pumping basin and sink and I'm lost for now.
Water leaves cylinder.
Water then branches off to basin mixer and sink mixer.
Water then goes past iso valve (which can be switched off for testing).
Water then travels via pipe to shower pump.
Then it can be the basin/sink mixer causing problem.
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I think I've cracked it!
As you know I have mains cold water into my bathroom and there is an isolating valve. I have operated this valve and check the cold water tank in the loft. To my joy the hot water backfeeding into the outlet pipe had stopped. I only have to mixer valves in the bathroom and after isolating the basin mixer the problem still continued. Therefore I can only deduce that the problem lies with the shower mixer allowing cold mains to bypass the mixer and push the hot water back.
2 Solutions; 1)The solution I have come up with, is to fit a pressure equalizing valve to the pipes running up to the shower mixer.
2) Reduce the cold water pressure at the service valve feeding the mixer to half.
What do you think guys?
As you know I have mains cold water into my bathroom and there is an isolating valve. I have operated this valve and check the cold water tank in the loft. To my joy the hot water backfeeding into the outlet pipe had stopped. I only have to mixer valves in the bathroom and after isolating the basin mixer the problem still continued. Therefore I can only deduce that the problem lies with the shower mixer allowing cold mains to bypass the mixer and push the hot water back.
2 Solutions; 1)The solution I have come up with, is to fit a pressure equalizing valve to the pipes running up to the shower mixer.
2) Reduce the cold water pressure at the service valve feeding the mixer to half.
What do you think guys?
G
Goldspoon
Try turning down the iso valve on the cold - won't harm to try. You could also then try a pressure reducing valve on the cold.
G
Goldspoon
Ideally you should have the cold to the shower coming from the CWSC and not the mains. This is why you have a problem.
Would it not be better to fit a pressure equalizing valve on both feeds instead of a pressure reducing valve on the cold feed.
It is indeed a strange set up for the mains cold water to be also running to the bathroom but something I'm discovering is not so uncommon accross the land. If I'm not mistaken, atleast I can drink cold water from my bathroom taps.
G
Goldspoon
I have not fitted one before to be honest. Maybe somebody else here has.
G
Goldspoon
It is not strange for mains cold to be running to a bathroom. It is strange for a plumber to fit a mixer shower (or any mixing device) and take the feeds from unequal supplies.
In order to fit a Pressure Equalising Valve it states, that the water heating system must be able to deliver hot water at a constant temperature, regardless of demand from the system.
I have an indirect gravity fed hot water system with a Baxi Bermuda 552 Back Boiler. Does this satisfy this criteria and sorrry for being so ignorant in this respect.
I have an indirect gravity fed hot water system with a Baxi Bermuda 552 Back Boiler. Does this satisfy this criteria and sorrry for being so ignorant in this respect.
Holy mother of Jesus no!!! Gate valves are the work of the devil
Full bore lever please.
Now cross yourself, and say 3 hail Marys!
G
Goldspoon
Thrashed myself with some sharp branches from the garden
That will suffice my son. You are forgiven!
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