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Dodgy shower pump

Discussion in 'Plumbing and Central Heating' started by Robert Perkins, 3 Mar 2021.

  1. Robert Perkins

    Robert Perkins

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    Hi all. I've moved into a new house and found that the shower doesn't work well. It is connected to a salamander double inlet pump which is situated 2 rooms away. When the shower is on the pressure is poor and takes ages to get hot. When it does start to get hot the pump cuts out every 7 seconds ish for about 0.5 seconds and then comes back on. Any ideas?

    Thanks

    Rob
     
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  3. Hugh Jaleak

    Hugh Jaleak

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    I'd hazard a guess the pump has been connected to the hot water supply incorrectly and is pulling in air instead of water. Need to see the plumbing layout I think to advise further.
     
  4. just pumps

    just pumps

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    Does it behave when on full cold only?
     
  5. Harry Bloomfield

    Harry Bloomfield

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    Mixer, or shower head etc. choked up with limescale?
     
  6. Robert Perkins

    Robert Perkins

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    It seems to be connected ok- see the image.
    106153]20210224_103815 by Robert Perkins posted 3 Mar 2021 at 8:39 PM[/GALLERY]
     
  7. Robert Perkins

    Robert Perkins

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    I'm not sure. Without shower head it's still not working. How can I remove limescale from mixer (if that's the issue)?
     
  8. Robert Perkins

    Robert Perkins

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    Not great pressure but doesn't do the strange on off thing.
     
  9. Harry Bloomfield

    Harry Bloomfield

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    Strip it down and soak in citric acid. Clean any filters too.
     
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  11. Hugh Jaleak

    Hugh Jaleak

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    Cold feed is in 22mm as well, possible it's trying to pull water out the cylinder faster than the supply can replace it, so is drawing air down the vent as well. Have you checked the cold storage cistern that supplies cylinder (and I assume cold side of the pump)? Gate Valves are all open fully?
     
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  12. just pumps

    just pumps

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    I like gate valves fully opened then turned back half a turn.
     
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  13. Robert Perkins

    Robert Perkins

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    Cold water tank seems fine - couldn't see any issues. Gate valves fully open. But yeah maybe the pipes are too big for the pump so possibly should be slightly closed?
     
  14. Robert Perkins

    Robert Perkins

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    I'll give it a go tomorrow. Kids in bed so I don't think a noisy shower pump would go down too well in the house right now. Thanks
     
  15. just pumps

    just pumps

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    Believe 22mm pipes are fine but you can check on manufactures site.
     
  16. Hugh Jaleak

    Hugh Jaleak

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    Pipes are right size for the pump, my thought was, if the pump is pulling water out the cylinder faster than gravity can replace it, then it's soon going to empty the vent pipe and start drawing air in that way.

    Wouldn't be the first pumped shower I've been to, Customer complains its noisy and poor performance, I've switched it on to find it cavitating like mad. Check the plumbing and the hot supply was taken from the the vent pipe, above the Tee, so pump was pulling in as much air as it was water. (BG installed it new apparently.) Reconfigured hot feed, customer said their shower was brilliant.
     
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  17. Robert Perkins

    Robert Perkins

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    Thanks for this. So looking at my layout- does it look like it could be pulling in air from the vent pipe? How would I be able to tell?
     
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