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Discuss Air accumulating in system. No pressure loss... in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. nomis

    nomis New Member

    Hello, I'm hoping someone can help...
    I have a system boiler (Worcester Bosch 18i - Unvented) in my garage. I am having to bleed top towel rad in house and magnaclean next to boiler daily. Air is getting into the system. I have no loss in pressure. I have removed the lower level rads in house and flushed (some sludge but not too much) I have also run system with X400, flushed and refilled. The air accumulates with hot water and/ or central heating running...
     
  2. chris watkins

    chris watkins Plumber

    Some parts of the system are under negative pressure this is allowing air to be drawn in without showing signs of leakage. Not so common with a system boiler because the the pump & expansion vessel are normally installed correctly in relation to each other. Check any Auto Air Vents & tighten down there caps just to ensure it is not entering via them. (you may need a Gas Safe Engineer to check the boiler over)
    What is the system piped up in, plastic or copper?
     
  3. nomis

    nomis New Member

    Hi Chris, Thanks for you reply. The whole system is copper.
     
  4. Harvest Fields

    Harvest Fields S. Mod Trusted Plumber GSR Top Contributor!!

    How many radiators do you have? Did you add any inhibitor into the system after the works was completed?
     
  5. nomis

    nomis New Member

    I have ten rads. Yes added inhibitor and have used test kit to ensure correct amount
     
  6. Harvest Fields

    Harvest Fields S. Mod Trusted Plumber GSR Top Contributor!!

    How old are all the radiators?
     
  7. nomis

    nomis New Member

    Mixture of ages. I don't believe the issue is corrosion though as I also get build up of air only when hot water is on...?
     
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