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combi and cold water pressure

Discussion in 'Home and Garden' started by hornetstinger, Oct 9, 2019 at 5:15 PM.

  1. hornetstinger

    Soldato

    Joined: Sep 6, 2016

    Posts: 5,966

    I'm getting a combi fitted and I would like the cold supply not to be mega high pressure, mainly for safety if the toilet ball **** sticks and if it fills so fast outflow will not be able to cope with the difference. Also with pipes not sure how the welds are, so don't need the toilet to refill in five seconds flat.

    What is best and where should this device go? Just after then incoming shut off for the house supply? Theres pressure reducing and gate valve or something
     
  2. robj20

    Sgarrista

    Joined: Apr 9, 2007

    Posts: 7,918

    Location: Manchester

    What sort of overflow is there on your toilet ours just dumps it into the actual toilet and can handle the full mains flow.

    If you really want to slow the toilet fill down just turn the isolation tap off a bit until it fills as fast as you want it to.

    And why is this something you're only just wanting after having a combi fitted?
     
  3. DXP55

    Mobster

    Joined: Aug 5, 2013

    Posts: 3,809

    Location: Shropshire

    Your having a new combi fitted and you want the cold water supply pressure reduced just for the sake of a 5 pound ball dick ?????
     
  4. Swifty55

    Soldato

    Joined: Feb 21, 2006

    Posts: 5,545

    Location: Home

    Just add an isolation valve to the cold water feed on your toilet, and close it slightly.
     
  5. FlyingFish

    Wise Guy

    Joined: Jan 1, 2003

    Posts: 1,483

    Location: Derbyshire

    You need to fit a pressure reducing valve and gauge at the mains stop tap. Job done.
     
  6. Participant

    Caporegime

    Joined: May 13, 2003

    Posts: 30,552

    Location: Warwickshire

    If you reduce the mains supply flow the performance of your combi showers and baths will be reduced.

    God knows why you'd want to do this. None of your reasons make sense really.
     
  7. b00merang69

    Gangster

    Joined: Sep 27, 2019

    Posts: 126

    Throw away the ball and get this or similar.


    Fluidmaster PRO45B

    [​IMG]

    It comes with little white piece you put in the bottom if your water pressure is too high.
     
  8. Al-Ectrician

    Hitman

    Joined: Sep 28, 2003

    Posts: 966

    Location: Glasgow

    Or fit a mains orifice to the we ball crane to fill slower.
     
  9. hornetstinger

    Soldato

    Joined: Sep 6, 2016

    Posts: 5,966

    Combi isn't fitted yet, it's a older style toilet with overflow to outside, not to cistern.

    Also older pipes not sure if they can take mains pressure.

    Also turning down isolator is not a good idea
     
  10. Thebug

    Wise Guy

    Joined: Feb 17, 2007

    Posts: 1,832

    Location: Walsall

  11. hornetstinger

    Soldato

    Joined: Sep 6, 2016

    Posts: 5,966

    Possible to reduce cold flow to taps and toilet but leave supply to boiler alone? So get full hot flow from boilrr
     
  12. hornetstinger

    Soldato

    Joined: Sep 6, 2016

    Posts: 5,966

    Yeah understand flow rate will be decreased just thinking prevention, as I came home and cold tank was overfilling so want to prevent things like that, if cold supply after boiler is reduced I mean do you need full pressure for cold around the home? No. Whatever traditional boiler pressure for cold (cold tank) is enough, combi cold pressure is over the top.
     
  13. hornetstinger

    Soldato

    Joined: Sep 6, 2016

    Posts: 5,966

    If cold water can be reduced after the boiler that would make sense right?
     
  14. bremen1874

    Capodecina

    Joined: Oct 20, 2008

    Posts: 10,465

    If you have a combi boiler you won't need any cold tanks.

    Cold taps are connected directly from the mains.

    Hot taps are connected to the combi which as a mains feed for the incoming cold water.
     
  15. hornetstinger

    Soldato

    Joined: Sep 6, 2016

    Posts: 5,966

    Yeah I know combi doesn't need tanks. Mum Has a boiler so know different to traditional boiler.
     
  16. bremen1874

    Capodecina

    Joined: Oct 20, 2008

    Posts: 10,465

    So there's nothing to overflow except the toilets.

    It's no problem to make sure that the toilet's overflow can keep up with its supply. That's something that should already be done and has nothing to do with the boiler type.
     
  17. hornetstinger

    Soldato

    Joined: Sep 6, 2016

    Posts: 5,966

    Yeah I know that. Maybe get prv fitted on toilet then
     
  18. hornetstinger

    Soldato

    Joined: Sep 6, 2016

    Posts: 5,966

    Just a bit paranoid as I can home and cold tank filling in would not want that happen to toilet thousands in damages so want to make sure
     
  19. bremen1874

    Capodecina

    Joined: Oct 20, 2008

    Posts: 10,465

    What happens to the toilet if you deliberately hold the float valve under the water to simulate a fault? Chances are the overflow will keep up and there'll be no problem except a bit of wasted water.

    If things really go wrong that's what insurance is for.
     
  20. b00merang69

    Gangster

    Joined: Sep 27, 2019

    Posts: 126

    Just do a poo through your next door neighbours letterbox, problem solved. :p