Posting a message to the forum will remove the above advertisement
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Checkout our Plumbers Insurance area - heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers.

Discuss Intermittent drip from overflow pipe. in the Plumbing Forum area at

  1. John P

    John P New Member


    I've got an drip that comes and goes from the overflow pipe from the black plastic tank above my boiler, which I think must be the feed/expansion tank. I had a new ball valve fitted by a plumber but still get a drip at times.

    I don't understand why, if the ball valve is working, there would be a drip sometimes but no drip at other times.

    Any advice would be appreciated.

  2. JCplumb

    JCplumb Plumber

    Any new mixer taps fitted recently?
  3. John P

    John P New Member

    Thanks for your response.

    No new mixer taps. The only plumbing work in the last year was replacement of valves on the heated towel rail.

  4. sammathias

    sammathias Plumber GSR

    Boiler overheating?
  5. Karl

    Karl Member

    Ball valve set up to high? Not enough room between water level and overflow to allow for expansion in the system?
  6. John P

    John P New Member

    Maybe. I've turned it down. Thanks for the suggestion.
  7. John P

    John P New Member

    Hard for me to say. I had new ball valve fitted but it made no difference. Tank is so close to ceiling that it's impossible to see inside.

    Thanks for the suggestions.

Similar Threads - Intermittent drip overflow Forum Date
Intermittent slow draining toilet Plumbing Forum Yesterday at 1:14 PM
Tun dish leaking intermittently on my Ariston Classico STI cylinder Central Heating Forum Jan 25, 2019