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  1. #1
    Join Date
    Jun 2014
    Posts
    3

    Default Replacing a non potable expansion tank

    I purchased a new one to replace the one that I have that is leaking.

    I turned off the water main, and opened a faucet to relieve the water pressure that was coming into my house.

    I then turned off the water supply to my existing expansion tank.

    My question is how to remove the old expansion tank. Should it be as simple as unscrewing the old one, and then screwing in the new one ?

  2. #2
    Join Date
    Jul 2009
    Posts
    173

    Default Re: Replacing a non potable expansion tank

    levinll,

    There are several expansion tanks used on residential hot water heating systems; the site below has photos of the 3 most popular; this is from the Home Improvement 1-2-3 book.

    Click onto the site below; then click onto "Home Improvement 1-2-3"; then scroll down to Chapter 12, and click on "Heating, Ventilation, Air Conditioning"; scroll down to 516: "Replacing an Expansion Tank"

    There is a procedure for adding air with a bike pump to a diaphram system if it isn't leaking; also for draining a waterlogged system; if replacing the tank with a new one is necessary, there is also a warning that waterlogged tanks can be very heavy to remove & easily slip out of your hands, causing damage to the heating system, personal injury, or both.

    Please post back if you have any further info; if you have a photo host site elsewhere, you can post some photos of the ET you are trying to repair or replace, and redirect them to https://advice.thisoldhouse.com

    http://books.google.com/books?isbn=0696213273
    Last edited by Pelton; 06-04-2014 at 05:55 PM.

  3. #3
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    7,760

    Default Re: Replacing a non potable expansion tank

    "My question is how to remove the old expansion tank. Should it be as simple as unscrewing the old one, and then screwing in the new one ?"

    That depends on your type of expansion tank connection.

    Remember that the new tank is pre charged (usually at 20 psi) and you will have to increase this pressure to match the house pressure.

    Not sure? don't take chances, hire a plumber. A mistake will wreck the new tank.

  4. #4
    Join Date
    Jun 2014
    Posts
    3

    Default Re: Replacing a non potable expansion tank

    My expansion tank has a rust spot that water is dripping out of.

    When I picked up the replacement tank from my local plumbing supply company, i inquired about adjusting the pressure of the tank. They said I didn't have to.

    Back to my original question. Does this tank simply screw off ?

  5. #5
    Join Date
    Jul 2009
    Posts
    173

    Default Re: Replacing a non potable expansion tank

    Quote Originally Posted by levinll View Post
    My expansion tank has a rust spot that water is dripping out of.

    When I picked up the replacement tank from my local plumbing supply company, i inquired about adjusting the pressure of the tank. They said I didn't have to.

    Back to my original question. Does this tank simply screw off ?

    levinll,

    You still haven't told us what your expansion is being used for---there are ETs that are used for well-water systems, then others that are used for heating systems, etc. please advise what your tank is connected to & whether it is a long, steel tank or one that looks like a squat propane tank connected to an outdoor gas grille.

    Please include photos.

  6. #6
    Join Date
    Jul 2010
    Location
    SoCal
    Posts
    7,760

    Default Re: Replacing a non potable expansion tank

    Let me tell you how to send photos: upload them onto a host like photobucket and then give us the link.

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