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    eddiescars's Avatar
    eddiescars Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Nov 30, 2006, 04:37 AM
    Central heating water level
    I can't understand why water keeps coming from overflow on my headder tank .
    I have turned tap which fills tank OFF . When heating is on the level DROPS but then rises again once the water in system cools... can't understant this, I expect the reverse as hot water EXPANDS so would think it should rise when hot...
    Can anyone expand on this.. Is it that I have leak in coil inside hot storage tank?
    caibuadday's Avatar
    caibuadday Posts: 460, Reputation: 10
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    #2

    Nov 30, 2006, 03:47 PM
    Quote Originally Posted by eddiescars
    i can't understand why water keeps coming from overflow on my headder tank .
    I have turned tap which fills tank OFF . when heating is on the level DROPS but then rises again once the water in system cools...... can't understant this, I expect the reverse as hot water EXPANDS so would think it should rise when hot.......
    can anyone expand on this...... ? is it that I have leak in coil inside hot storage tank ??
    The" fill tank", make up, could be leaking by, yes the coil in the storage tank may have a hole in it... shut off the IN/ OUt valves of the storage tank to verify if it leak. It could be one of the two or both are leaking
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #3

    Nov 30, 2006, 07:17 PM
    That is odd, my first look would be at the expansion tank.
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