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Discuss Is there such a think as a water pipe non return valve? in the Bathrooms, Showers and Wetrooms area at PlumbersForums.net

Messages
14
Hi, I have a shower coming from a bath mixer tap. Because the hot water is such low pressure I fitted a pump to the hot wter tank - this works fine. The problem is, the pressure of the hot water far outweighs that of the cold and if you shower for anything longer than few minutes the hot pushes the cold back up the pipe, fills the tank and water starts shooting out the side of the house! I am waiting for a quote for a plumber to fit a pump that will work for hot and cold thus equalising the pressures but I was just wondering, is there a fitting that will stop the cold water reversing as this would be much cheaper than a new pump? I have googled this but am confused as some say they are for air only and I am not sure about sizes. Any advice would be great. Thanks in advance. Happy Easter to all!
 

Ric2013

Plumber
Messages
2,672
Yes, it's called a non-return valve, or a check valve, for backflow protection. But if your hot pressure far outweighs the cold then fitting one will not really solve your problem in that although it would prevent the backflow, you might still experience poor performance from the mixer without the pressures being roughly equalised.
 
Messages
14
Hi,
thank you for the information, much appreciated. I had a plumber round and he recommended putting in a better pump and run hot and cold through so they both equalise. I just wondered about the valve as the new pump plus installation isnt cheap so it may be worth trying the valve first. Thanks again for your time.
 
G

Gerald

Hi, I have a shower coming from a bath mixer tap. Because the hot water is such low pressure I fitted a pump to the hot wter tank - this works fine. The problem is, the pressure of the hot water far outweighs that of the cold and if you shower for anything longer than few minutes the hot pushes the cold back up the pipe, fills the tank and water starts shooting out the side of the house! I am waiting for a quote for a plumber to fit a pump that will work for hot and cold thus equalising the pressures but I was just wondering, is there a fitting that will stop the cold water reversing as this would be much cheaper than a new pump? I have googled this but am confused as some say they are for air only and I am not sure about sizes. Any advice would be great. Thanks in advance. Happy Easter to all!
Fit a pressure equalising valve. It will automatically adjust the highest pressure down to match the lower one.
Altecnic GR5531002 is one that will do the job.
 
Messages
1
You need a pressure equalising valve that will automatic adjust the highest pressure down to match the lower one. An Altecnic GR5531002 is a good one.
 

EvilDrPorkChop

Gas Engineer
Messages
702
Your plumber is right, you need to pump cold and hot supplies. Otherwise it'll never work. Non Return valves aren't your answer.

Rather than a pump you might want to invest in updating your system to an Unvented hot water system, or combi boiler. Personally I always think pumps are a waste of money when it could be put towards one of the above systems.
 
Messages
6
using of pressure equalizing valve will take you out from this trouble. Because it will equal the pressure of hot and cold water, no matter what's the difference between hot and cold water pressure.
Equalising the pressure is ok, but if Phil's cold is also supplied from a tank in the loft (same as the hot) then he'll be more or less back to where he was without the pump! Ok if the cold is on the higher pressure mains of course, but if this is the case I'm surprised that the cold isn't still at a similar or higher pressure than the pump is supplying to the hot. (If mains pressure is low, a mains pressure booster from salamander or grunfos might benefit the whole house.)
 
Messages
14
Hi and thanks for all answers. Yes the cold comes from a tank in the loft so the pump does increase just the hot water, hence it pushing the cold back up to the tank then fills the tank which then pours outside. Equalising to the lowest pressure would be pointless - I might as well just turn the pump off. Which if I do, results in a trickle of a shower. I think a good pump on hot and cold as the plumber suggested, might be the only answer.
 
Messages
14
After some thought I think I might go for the house pump which will equalize the hot and cold to the showers and boost the hot throughout the house - this seems ideal. I know this is a difficult question to answer but how much should I look to be paying in total, for both the pump and the work? I ask as I have had a quote and it seems very expensive. But I have no reference so any ballpark figures would help. There are two showers to boost and there is space next to the hot water tank for the pump to sit. Thank you.
 

EvilDrPorkChop

Gas Engineer
Messages
702
After some thought I think I might go for the house pump which will equalize the hot and cold to the showers and boost the hot throughout the house - this seems ideal. I know this is a difficult question to answer but how much should I look to be paying in total, for both the pump and the work? I ask as I have had a quote and it seems very expensive. But I have no reference so any ballpark figures would help. There are two showers to boost and there is space next to the hot water tank for the pump to sit. Thank you.
How much have you been quoted?
 

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