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Discuss Automatic Air Vents - How Many are required? in the Plumbing Forum area at

  1. topman870

    topman870 New Member

    Hi Guys,

    My son has just had a his plumbing done about a year ago and one of the air vents seems to be bubbling/leaking up.

    I have attached some pictures, I can see a total of 3 air vents, flow and return near the boiler hve one each and there is one on the return on the return pipe near the cylinder.
    does this sound about right or has he guessed the work and stuck one every where?

    I'm thinking of closing it off if not required...

    In my house i only see 2.



  2. rpm

    rpm Trusted Plumber

    The site owner doesn`t like links to other forums ;)

    And I don`t like having a complete post removed for no good reason.
    Who was it and tell me why via a pm if you prefer to stay in the shadows.
    Last edited: Sep 23, 2017
  3. topman870

    topman870 New Member

    Its not exactly copying someone elses link, Im posting the same on this forum to see if a get a reply
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Screw the black caps back down only need opening if draining and filling the system
  5. snowhead

    snowhead Well-Known Member

    The purpose of an Auto air vent is to vent high points when air is likely to accumulate.
    The location of the boiler 2 is wrong and won't do much except when refilling the system.

    As per Shaun, close the boiler ones off either with the black cap on top or the valves immediately below.

    The one on the cylinder return isn't going to achieve anything either.
    • Winner Winner x 1
  6. Chalked

    Chalked Plumber GSR

    Tidy pipework. But it's a shame the vents aren't at the top of the flow and return!
    • Winner Winner x 1
  7. topman870

    topman870 New Member

    thanks for the replies.

    Where should have the cylinder have been fitted or was it not required as it too low already?

    Cowboy plumber he was in this case!
  8. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Be fine where they are but the heating ones should of been at the heights point
  9. AWheating

    AWheating Trusted Plumber GSR

    manual vents would be better, maybe a deaerator.
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