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Discuss Tankless Toilet from Attic Tank in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. Simeon

    Simeon New Member

    Hi

    Has anyone tried running a toilet without a cistern from an attic tank in a normal house?

    I'm thinking of installing a toilet with a hidden cistern in my house, and concealing it is a bit of a problem. There's a nice big tank in the attic a few meters above, so I'm wondering if it'd be possible to do away with a separate toilet cistern altogether.

    According to wikipedia (link below) a 1' pipe and 2.1 bar of pressure, together with a "flushometer" valve is suitable. I've already installed a Walrus pump coming from the attic tank for the shower, so am wondering if I can use this for the toilet too.

    Flush toilet - Wikipedia

    Any thoughts? Apologies if this is a ridiculous question - I'm a DIYer, not a plumber!

    Simeon
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Are you in the uk Simeon?
     
  3. rpm

    rpm Trusted Plumber

    You can buy them in the UK.
     
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    yes normally mains fed but the flushometer is a usa toilet system and requires a special toilet so unsure
     
  5. Simeon

    Simeon New Member

    I'm in Ireland - we can usually get similar stuff to the UK here (or I can always drive up to NI if I need to).

    Is there a name for these sorts of toilets? I tried googling a few things but maybe I wasn't using the correct name for them?
     
  6. rpm

    rpm Trusted Plumber

    Uh, ok, can`t see why myself looks like a high level cistern pan.
     
  7. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

  8. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    WC Flushing Systems / WC Flushing Control / Cistermiser Easyflush Direct flushing valve for infrared WC flushing from mains supply.

    Needs to be fed from its own tank eg not connected/ teed into your tank for hot water feed etc
     
  9. rpm

    rpm Trusted Plumber

    However there are pictures showing a pan with rear entry flush pipe as well.
     
  10. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Don't know then mate can
     
  11. Simeon

    Simeon New Member

    Thanks - it looks like my pump isn't up to the specs it needs unfortunately. Mine can supply about 40lpm at 2 bar, but it needs 90lpm, so it'd be a case of buying a new pump specially for it. I'll see what it all looks like price wise though.

    I'm a surprised it needs so much pressure - the pressure coming from a normal toilet cistern to the pan I'd have thought would be much lower, but then the pan is probably designed differently.
     
  12. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    I would say your pump would be fine (you would need to check with the manufacturer tho) a stand toilet cistern can supply 7 litres ish (if it's set up for eco it's a lot less around 4 litres)

    So a flush normally takes 10 seconds so that's 42 lpm
     
  13. rpm

    rpm Trusted Plumber

    Put the cistern in the loft aka high level cistern, extend the flush pipe to suit and have the pull flush chain coming through the ceiling :rolleyes:
    Just make sure the seat & lid are down before flushing! ;)

    (Just joking).
     
    • Like Like x 1
  14. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    You may laugh but seen that using an f and e tank
     
  15. Simeon

    Simeon New Member

    They do say they need 90lpm on the website:

    "To achieve an effective and efficient flush the water system needs to deliver at least 90 lpm (litres per minute). Typically this would require that the dynamic water pressure, measured before the valve, is at least 2bar. If 90 lpm cannot be achieved, the flush will be less effective and a longer flush duration or multiple flushes may be required"

    But as you say, it seems an awful lot of pressure, and if a longer flush is needed it isn't the end of the world. I guess the best thing to do is a bit of an experiment - I've an ensuite that we're getting rid of, so I'll try rigging it up with just a ball valve and see what happens, then if it works buy a Cistermiser for the real thing.
     
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