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Thread: Expansion Tank Question - Boiler forum

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    Default Expansion Tank Question - Boiler forum

    Sorry I posted this in the water heater forum by mistake so I am repeating here.

    I have an expansion tank over my boiler. I came in to catch it dripping down the side and noticed the hard water evidence of prior dripping onto the boiler.
    Is it supposed to be doing this? How does it need to be adjusted? If this is important then I need to call a plumber. Thanks in advance

  2. #2
    Illinois Licensed Plumber SewerRatz's Avatar
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    Quote Originally Posted by LD View Post
    Sorry I posted this in the water heater forum by mistake so I am repeating here.

    I have an expansion tank over my boiler. I came in to catch it dripping down the side and noticed the hard water evidence of prior dripping onto the boiler.
    Is it supposed to be doing this? How does it need to be adjusted? If this is important then I need to call a plumber. Thanks in advance
    A picture would be helpful. But any sort of leak should be repaired.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    While it could be the connection to the tank, it is probably more likely the tank is shot. It should be primarily filled with air. If you rap it with your knuckle, you should be able to tell if it is full of water or not. If it is full, it is almost certainly shot...replace it.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    In the Trades Gary Swart's Avatar
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    The nice thing about expansion tanks is they are easy to replace. If it's full of water, it will be heavy and since they are often awkward, use care when unscrewing it.

  5. #5
    Web Development | HVAC patsfan78's Avatar
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    Default Replace it

    Unfortunately, sounds like you need to replace it. But the good note, is that they are relatively inexpensive and require no real plumbing knowledge. Purchase a good one, the kind with a bladder inside. If it is full of water it will be heavy so don't drop it on your foot.

    Good Luck

    http://www.hitechheat.com

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    Master Plumber nhmaster's Avatar
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    Quote Originally Posted by patsfan78 View Post
    Unfortunately, sounds like you need to replace it. But the good note, is that they are relatively inexpensive and require no real plumbing knowledge. Purchase a good one, the kind with a bladder inside. If it is full of water it will be heavy so don't drop it on your foot.

    Good Luck

    http://www.hitechheat.com
    You forgot to mention that the boiler needs to be shut off. The pressure needs to be drained, and if the boiler is up to temperature, the water dripping out will be scalding hot. The tank needs to be properly sized and the pressure in the tank needs to be correct. Not exactly what I would call a DIY job.

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