1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Low flow on new bath mixer tap

Discussion in 'Plumbing and Central Heating' started by Derekbirmingham, 12 Mar 2020.

  1. Derekbirmingham

    Derekbirmingham

    Joined:
    20 May 2018
    Messages:
    52
    Thanks Received:
    0
    Country:
    United Kingdom
    Hello people.
    Ive just had a new bath and tap fitted by a plumber.
    After he left i realised the hot water flow on the hot it half it was on my old basic taps.
    I have a copper water tank.
    Am i right in assuming this is the new crappy mixer tap that was fitted causing this problem people.
     

    Attached Files:

  2. Sponsored Links
  3. denso13

    denso13

    Joined:
    22 Jan 2007
    Messages:
    5,607
    Thanks Received:
    1,116
    Country:
    United Kingdom
    Possibly, if it is connected using a braided flexi connector that won't help either. Some of those have a small bore. Got a photo of the taps from below?
     
  4. Derekbirmingham

    Derekbirmingham

    Joined:
    20 May 2018
    Messages:
    52
    Thanks Received:
    0
    Country:
    United Kingdom
    I havent got a photo but yea.its Connected with small bore flexi hose.and removed this original copper piping.
     

    Attached Files:

  5. Madrab

    Madrab

    Joined:
    4 Oct 2012
    Messages:
    8,211
    Thanks Received:
    2,337
    Location:
    East Renfrewshire
    Country:
    United Kingdom
    Yup, should have kept it the way it was will full 22mm right up to the tap. That and a mixer cartridge like that is, unfortunately, probably the worst type of tap you could have put onto a gravity HW system. Ideally that would be reverted back to a full bore deck mixer if the holes are still 180mm

    [​IMG]
     
    • Thanks Thanks x 1
  6. gas112

    gas112

    Joined:
    27 Oct 2009
    Messages:
    22,399
    Thanks Received:
    7,993
    Country:
    United Kingdom
    There is low pressure and high pressure taps, could be you have bought high pressure taps which are slow on gravity systems
     
  7. Derekbirmingham

    Derekbirmingham

    Joined:
    20 May 2018
    Messages:
    52
    Thanks Received:
    0
    Country:
    United Kingdom
    so madrab if i fitted these half inch taps,would it solve the reduced hot water flow.
    I mean im not to fussed about fancy mixer taps .
     

    Attached Files:

  8. denso13

    denso13

    Joined:
    22 Jan 2007
    Messages:
    5,607
    Thanks Received:
    1,116
    Country:
    United Kingdom
    No, they are basin taps, you need 3/4" bath taps.
     
    • Thanks Thanks x 1
  9. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    74,144
    Thanks Received:
    4,282
    Location:
    Crossgates, Europe
    Country:
    Cook Islands
    If you can find bath-size Bristan Regency taps, they are a similar style but much better quality.

    Have a look on ebay and sort by price.

    Some of their other styles are cheaper, but less beautiful. I wouldn't get ceramic taps if I were you.
     
    • Thanks Thanks x 1
  10. Sponsored Links
  11. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    23,386
    Thanks Received:
    9,640
    Location:
    Lanarkshire
    Country:
    United Kingdom
    will be the flexi hoses most have a really small bore
     
    • Thanks Thanks x 1
  12. Gasguru

    Gasguru

    Joined:
    9 Sep 2005
    Messages:
    12,422
    Thanks Received:
    3,305
    Location:
    Sussex
    Country:
    United Kingdom
    • Thanks Thanks x 1
  13. Madrab

    Madrab

    Joined:
    4 Oct 2012
    Messages:
    8,211
    Thanks Received:
    2,337
    Location:
    East Renfrewshire
    Country:
    United Kingdom
    If there is a need to have some flexibility then I'd use plastic 22mm, at last that way you at least maximise the gravity flow.
     
    • Thanks Thanks x 1
  14. Derekbirmingham

    Derekbirmingham

    Joined:
    20 May 2018
    Messages:
    52
    Thanks Received:
    0
    Country:
    United Kingdom
    Ok thanks people.
    Heres the hoses he used.
     

    Attached Files:

  15. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    23,386
    Thanks Received:
    9,640
    Location:
    Lanarkshire
    Country:
    United Kingdom
    that is your problem right there
     
  16. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    74,144
    Thanks Received:
    4,282
    Location:
    Crossgates, Europe
    Country:
    Cook Islands
    the left hand one also appears to be twisted. Inside the metal braiding is the actual waterpipe, which is thin plastic and easily kinked. It can be un-twisted by loosening the nut and re-fixing.

    I can't make out the pipe size.
     
  17. Madrab

    Madrab

    Joined:
    4 Oct 2012
    Messages:
    8,211
    Thanks Received:
    2,337
    Location:
    East Renfrewshire
    Country:
    United Kingdom
    That certainly adds to the low flow, those flexi's and the cartridge mixer all need mains pressure to work properly.

    I have to say your plumber's a bit on an idiot though if he thought that would all work properly on a gravity system. The pièce de résistance is the
    (3/4")22mm>15mm reducer for the hot feed .... so the cold on a larger flexi ... that really takes the biscuit o_O That alone will unbalance the supplies if the cold's on gravity too, as the pressure is already low, it's all about maximising flow.
     
    • Thanks Thanks x 1
Loading...

Share This Page