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Discuss Conventional system hot water pump issue in the Fittings & Pipes area at UKPlumbersForums.co.uk.

  1. Jay2kayuk

    Jay2kayuk New Member

    I have a conventional system and my boiler has Surrey flange. The expansion pipe feeds upstairs bathroom also, but I would like to pump the hot water for upstairs similar to the diagram. Do I have to run a separate feed to upstairs supply?

    8700DD45-B45B-4AF0-9CF9-76E0FB5D33E9.jpeg
     
  2. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    So pumped shower and hot water upstairs?? Not pumped down stairs
     
  3. Jay2kayuk

    Jay2kayuk New Member

    Pumped shower on middle floor and hot water. Need to pump top floor.
     
  4. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Are the water tanks above that?
     
  5. Jay2kayuk

    Jay2kayuk New Member

    Yes water tanks are in loft above that.
     
  6. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Ok then you’d probably need minimal repiping and a whole house pump. As long as the tanks are well above all outlets then you can get away with a positive head. You may wish to consider getting larger loft tanks to compensate the likely increased water useage
     
    • Agree Agree x 1
  7. Jay2kayuk

    Jay2kayuk New Member

    I was actually thinking about switching cold to mains and pumping hot from middle floor. But again the top floor hot is fed off same feed as expansion.
     
  8. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    If you are going to pump it then pump the lot otherwise your supplies will not be balanced
     
    • Agree Agree x 2
  9. Coby kenny AGUILAR

    Coby kenny AGUILAR Member

    Cap the upstairs feed off the vent preferably cutting the tee out

    Run a separate supply for the hot upstairs down to the pump - to pump outlet

    Unvented cylinder if you've got the pressure is a better way to go
     
  10. Coby kenny AGUILAR

    Coby kenny AGUILAR Member

    Also check the cold down service you haven't shown it in your drawing.

    If the hot tees off the vent that high up chance are the cold down service is tee'd off too
     
  11. YorkshireDave

    YorkshireDave Plumber

    Why didn't whoever drew that show a pt 2 ball valve I wonder?

    Most pumps will work perfectly well with as little as 400mm tween the bottom of the stored water and the highest point in the shower.
    So far as I recall, all pump manus tell you to double the amount of stored water when pumping. The way additional tanks are linked is also very important in order to avoid genuine nasties.
     
    Last edited: Apr 16, 2019
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