Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Expansion tank for unvented cylinder

My wife and son heard a big bang in the other night, we couldn't figure out what it was...then saw this. The weight of the expansion tank had pulled it out of the bracket and ripped a couple of small holes in the plaster. 
I went to rehang it myself but it was extremely heavy. 

I see in other posts that the weight of the piping should be sufficient. There doesn't appear to be any damage from the fall as I can see - but I'm just wondering if what I said above means there's a problem with it internally?


  • Larry Weingarten
    Larry Weingarten Member Posts: 3,323
    Hi, It would be good to see a picture, but I'm wondering if the diaphragm in the tank has failed and the tank filled with water. Might be worth checking 😊
    Yours, Larry
  • leonz
    leonz Member Posts: 1,154
    edited April 10
    I agree with Mr. Weingarten and the total weight of the water in the tank tore it down.

    You can check for water in the expansion tank by pressing the Shraeder valve fitting and if there is water coming out it the tank is bad and you need a new expansion tank of the same size or one size larger.