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Andrew Smith
Andrew Smith, Plumber
Category: Plumbing
Satisfied Customers: 3776
Experience:  City and Guilds qualified plumber
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Would it be acceptable to boost the cold feed from the cold

Customer Question

Hi,Would it be acceptable to boost the cold feed from the cold water tank to the hot water cylinder in a conventional open vented system with an automatic pump? My understanding is that presure difference would only be created when hot water taps are open so the pump should only run when needed.This way I could install a very quiet in-line automatic booster pump that would improve hot water pressure for both shower and taps. This specific booster pump only works with cold water though, it can not be installed to the hot water vent pipe.Pump is: Salamander HomeBoostMany thanks
George
Submitted: 4 months ago.
Category: Plumbing
Customer: replied 4 months ago.
https://drive.google.com/file/d/1HNByMiqokws4Z1-L9RrSqZq5qrFslfTu/view?usp=sharing
https://drive.google.com/file/d/19AIyp7X_fbhTsw_H-Y_M3aBOpHnDp06y/view?usp=sharing
https://drive.google.com/file/d/1OLGQ33v-5h_kqZUkeUazjFKBu4Ad07bH/view?usp=sharing
Expert:  Andrew Smith replied 4 months ago.
Is the shower pump one you have fitted?
Customer: replied 4 months ago.
No, it was fitted by a plumber
Expert:  Andrew Smith replied 4 months ago.
All good pumps have reed switched fitted so only run when flow is detected
Customer: replied 4 months ago.
Ok, but this does not answer my question
Expert:  Andrew Smith replied 4 months ago.
Are you looking to fit a booster on the cold when you already have a shower booster fitted?
Customer: replied 4 months ago.
That is only for the shower and too loud anyway. I need to boost hot for taps. I want remove the existing pump and install a quiet in line pump but to the hot cylinder’s cold supply. Asking if its possible? Forget pictures and cold water to shower for now.
Expert:  Andrew Smith replied 4 months ago.
Ok.
If you boost the cold supply into the cylinder then you could have problems pumping up the open vent when it turns on.
Also the cylinder will not be rated for pressure like that.
The best suggestion would be a twin impeller booster pump again but a decent make (Stuart Turner etc) ensuring a high flow model and then tee off after this to use as a whole house system for both hot and cold.
Expert:  Andrew Smith replied 4 months ago.
To boost the inlet to the cylinder then you will need to change to a pressurised cylinder.