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Slow leak in underground central heating pipes

  • 27-04-2025 03:20PM
    #1
    The Reader
    Registered Users, Registered Users 2 Posts: 86 ✭✭


    I always had a small tank in attic to replenish the water loss in the central heating system. In the course of upgrading my heating system the small tank in my attic was replaced with a 24L potable water pressure tank.After its installation the pressure gauge on filling loop was loosing its pressure which flags a leak in the underground pipework. After getting the leak detector on site he identified an approximate location of the leak. Plummer wants me to try the leak sealant into the system rather than go routing into the floor to find the slow leak.Has any of you good people any views on the matter as to what direction I should take. Tried the leak sealant before on another plumming issue ,it was not a success.



Comments

  • #2
    Wearb
    Moderators, Home & Garden Moderators Posts: 6,707 Mod ✭✭✭✭Wearb


    Why have you got a potable vessel on your heating system?



  • #3
    Lenar3556
    Registered Users, Registered Users 2 Posts: 2,375 ✭✭✭Lenar3556


    I would try the leak sealer first, it will do no harm and may provide a satisfactory remedy. Opening floors in search of a slow leak like that may turn into a major undertaking - and there may be more than one leak.

    I suggest the Plumb7 leak sealer. It may take 2-3 bottles.

    Also ensure that the basic items are checked first. Is the expansion vessel correctly sized and operative? Is there any indication of a discharge at the pressure relief valve? A good test is to charge the system to 1.5 bar when cold, then watch the pressure gauge as you bring the system up to full temperature. If the pressure exceeds more than approx 2 bar there is an expansion problem which will cause the same symptoms as you have.



  • #4
    The Reader
    Registered Users, Registered Users 2 Posts: 86 ✭✭The Reader


    Yes Wearb. Plummer initially said that with that system you get the radiators having a more consistent output of heat, frankly I did not see the merit of it to date maybe the present leak is not helping it. There you go in that respect.?

    Okay Lenar will give further attention to your view and go through it in detail.

    Thanks to all for the views.



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