20% of my radiators are freezing ( OAT 0’c in Dublin now)

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    • #274154
      Avatar photoAnonymous

        We have an oil fired heating system in our home with 5 radiators downstairs and 4 upstairs..yesterday I bled the downstairs ones only to end up with all but two rads going full heat and the other two ‘freezing’…I investigated the attic header tank and discovered the tank empty due to a stuck ballcock…fixed this and re bled ……still the same . The two that are cold sre downstairs and are the last two to be heated , they appear to get their feed from upstairs!? anyone help a cooling Irishman !!

      • #289261
        Avatar photoHarold Kestenholz
        Participant

          A gravity system has one motive force, gravity. If the feed is upstairs, then warm water needs to come down, which is against physics. It is the falling column of cold water that moves the warmed water upward. A circulator overcomes the problem.

          The block to the heating system is the introduction of air into a location that traps air in the path. Look for such a location and eliminate the air. Better yet, eliminate the air trap.

          If the feed to these two radiators is as you describe, a system would take a long time to overcome the piping problem. The velocity of water in the feed would need to increase to induce a circulation. This can take time.

        • #289262
          Avatar photoSylvanLMP
          Participant

            Check the down feed pipe for obstructions as you did let the tank run DRY it could have allowed sediment to block a line feeding these Rads Good luck Mate

          • #289263
            Avatar photoGuest
            Participant

              take off the rads that are not working
              put a bucket under the rad valves and open them 1 at a time till hot water comes through
              then when hot water comes through refit rad, turn on one side and bleed rad, then open other tap and hey presto !!!

            • #289264
              Avatar photoGuest
              Participant

                I turned on one side and then the other, but nothing happened to the radiator. How do you get the pipes to bend so I can get the radiator on its side?

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