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Old hot water system expansion tank

My old hot water system has a large expansion tank in the attic.  Can I get rid of that? I have noticed that newer systems have smaller tanks next to the boiler. The old tank used to have an overflow pipe off the top that went to a drain.  It is no longer there so there is an open hole in the top of the tank.  The system is working??? Should it be plugged??


  • Ironman
    Ironman Member Posts: 7,379
    Old Tank

    You have an old gravity flow system. Has it had a pump added to it?

    Do not plug the tank, you could over-pressurize the system!

    Please re-post this on "the main wall" with some pics of your near boiler piping - you'll get more responses there. This section is for domestic (potable) hot water.

    Also, a pic of how your radiators are piped would help.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
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