• Welcome to PlumbersForums.net - The international free plumbing advice forum. Professional plumbers sharing advice with fellow plumbers and DIY alike. Register for free today! - Checkout the Plumbing Advice forum and then our Plumbing Videos area which still needs populating.


A cistern (Middle English cisterne, from Latin cisterna, from cista, "box", from Greek κίστη kistē, "basket") is a waterproof receptacle for holding liquids, usually water. Cisterns are often built to catch and store rainwater. Cisterns are distinguished from wells by their waterproof linings. Modern cisterns range in capacity from a few litres to thousands of cubic metres, effectively forming covered reservoirs.

View More On Wikipedia.org
  1. A

    URGENT Thunderflush dual installation problem

    I have just installed a Thunderflush dual flush cistern outlet valve. The unit sits to high for the lid and buttons to sit and engage as they should. I have adjusted the button height fully yet it is still about 8mm too high. What can be done?
  2. H

    Hello from a DIYer in Shropshire

    My toilet cistern has a black box inside hiding all the components. How do I sort out the problem I have with my toilet constantly running/emptying?
  3. S

    Noisy Cistern on Flushing

    Hi folks, Soon after having oil fired central heating fitted my cistern started sounding like a foghorn having previously been quiet. It involved the fireplace being torn out, old pipe work crimped, cut and removed. The noise may be coincidental, but a noticeable increase in water pressure was...
  4. S

    Toilet Flushing Cistern Sounds Like Foghorn - Help!

    Hi, It may be coincidence but not long after getting oil fired central heating fitted to older ex-council property (fireplace and necessary plumbing torn out/replaced as required) every time toilet is flushed it sounds like a foghorn. Vibrations run through house and can be heard clearly...
  5. M

    Leaking water inlet to Cistern

    Hi everyone, thanks for your time reading this! We have noticed a leak appearing from the built-in toilet in our main bathroom that's spreading around our floors (great start to the year!). I've removed the panel behind the flusher and can see the water inlet attaching to the Cistern is slowly...
  6. B

    Cistern keeps overflowing

    My cistern kept overflowing randomly was told it was probably caused by the bottom filling valve failing I purchased one and a plumber fitted it and tested it and all seemed well, we where away for a couple of weeks and came back and there was no evidence that it had been overflowing but after...
  7. A

    No water flow into cistern

    Hi I have a Dudley vantage dual flush pneumatic Niagara flush valve system. The cistern is not refilling after a flush. The system has never been good - refilling very very slowly but now not even doing this. I can turn on /off the cold water tap on the bath which is situated next to the cistern...
  8. H

    Shanks Cavendish symphonic cistern

    I noticed a thread on a Shanks Cavendish symphonic cistern, is there anyone in the Irvine, Ayrshire area who has knowledge of this cistern and could carry out a repair ?
  9. H

    Geberit cistern waste into 110mm soil pipe

    Hi I’m trying to find something that will connect a geberit 90mm toilet waste pipe into a standard 110mm soil stack. The geberit cistern came with an adaptor that increased the outside diameter of the pipe to 110mm. However this is the same diameter as the soil stack pipe. Is anyone aware of...
  10. B

    Fitting a cistern (with frame) into a stud wall (100mm) (follow-up)

    Hello all, This is a follow-up to this post: Fit wall-hung toilet to inside stud wall? - https://www.plumbersforums.net/threads/fit-wall-hung-toilet-to-inside-stud-wall.127877/. I'd like to fit a cistern into a stud wall, which is 100mm wide. Typically, the dimensions of the toilet fixing...
  11. M

    vitra single button cistern lid won't come off

    Just move to a new place, toilet flush not enough water. Try to take off the lid to see vit it won't come off. Toilet has the word Vitra on it. Already unscrewed the single button off but the lid seems stuck or glued. Not even move slightly. Anyone have idea want else I could do please? Thanks
  12. N

    Toilet cistern flush max capacity question

    Hello Can anyone tell me if it is possible to buy a toilet which has cistern flush capacity (not sure if I have phrased that correctly) of more than 6LTRs? We previously had a Royal Doulton toilet which was accidentally thrown away when had the bathroom changed. New toilet is one of these...
  13. J

    Can't connect cistern inlet connector because of inlet filter

    Hi. I think the title says it all really. I was just lining up pipework and stuff and noticed that the Speedfit 15mm X 1/2 BSP tap connector won't connect to the cistern inlet because the inlet filter protrudes out too far to allow the rubber washer on the connector to sit against the outer...
  14. F

    Foghorn/Splutering from cistern! Video attached

    Hi all, Had a toilet installed recently which is now making the attached sound. (No chance of him coming back to sort it...) Anyone know what's causing it? Issue coming from whatever that piece is on the right hand side (please let me know). Cheers
  15. G

    Cistern fill valve - very low pressure

    Hello, does anyone know of a side fill valve that works in very low pressure situations? I installed two separate new side fill valves on my concealed cistern today, a Fluidmaster and a Dudley, both didn't seal properly. From reading reviews and forums it looks like it's due to the very low...
  16. G

    How to put the cistern against the wall

    The toilets both have a piece of wood between the cistern and the wall.I cannot find an outlet pipe which will let me push the cistern against the wall. Do I have to get a different toilet to achieve this.
  17. M

    Mass of gunge in cold water storage cistern.

    Hi all. Hope you are enjoying the sunshine and hope no one is working in lofts at mo. Anyone seen this gunk before in a cold water storage cistern?
  18. A

    Cistern leaking water to seat area when I flush

    Hi Guys, I have a toilet where when you flush, the water from the cistern leaks out from a section of the cistern at the bottom where the seat area begins at the top just before the bowl. Was wondering how this could be happening or how it could be fixed?
  19. M

    Cistern not filling?

    Hi new to the plumbing industry, can anyone advise me on why the cistern is not filling with water but can hear the sound of water running? Would it be the side filling valve and maybe replace for a newer one? Also should the symphony i am holding have a washer at the bottom as this doesn’t...
  20. philw67

    Replace cistern mechanism

    Hi, we moved into a new house a while back and the main toilet has a large cistern and no dual flush capability. It gets used most of the time rather than the single ensuite we have so I was wondering if someone can recommend a kit to replace the lever with a two button arrangement or other...
Creating content since 2001. Untold Media is a Registered Trademark.