2nd expansion tank in 4 months

Discussion in 'Water Heater Forum, Tanks' started by pllckjsh, Aug 2, 2010.

  1. pllckjsh

    pllckjsh New Member

    Messages:
    3
    Location:
    ohio
    Hey guys looking for a little info here..I am the head of Maintenance for a big hotel chain in ohio..this is the problem we have 3 hot water heaters in one room all have expansion tanks...in april we noticed one of the expansion had a pin hole in it and was shooting water across the room...so we replaced it and just noticed today that the new expansion tank is leaking now. what would cause these to go bad so fast.The two other water heaters still have the original expansion tanks on them and both still look new. These water heaters are about 7 years old.....thanks in advance guys

    Josh in ohio
  2. zl700

    zl700 DIY Senior Member

    Messages:
    237
    Location:
    Texas
    Did you use the proper potable water expansion tanks? Whats the model number of the new one that failed?

    If you used a boiler expansion tank designed for a closed system, the oxygen in a open system would eat through it quickly.

    Potable expansion tanks for DHW systems have a liner inside the tank similar to a milk jug.
  3. pllckjsh

    pllckjsh New Member

    Messages:
    3
    Location:
    ohio
    I just talked to the maintenance guy who replaced it he said the new tank is a Extrol 30 4.4 gal hot wat0001.....he said he got it from johnstone supply
  4. Redwood

    Redwood Master Plumber

    Messages:
    7,453
    Location:
    Connecticut
  5. zl700

    zl700 DIY Senior Member

    Messages:
    237
    Location:
    Texas
    Yep as I expected, you have the wrong type

    Expect to pay 2.5X more for the correct tank
  6. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,233
    Location:
    Cave Creek, Arizona
    Johstone # L86-193, L86-194, L87-200, and L87-201 are the potable water tanks.
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