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    bk2ny's Avatar
    bk2ny Posts: 1, Reputation: 1
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    #1

    Jan 18, 2014, 10:44 AM
    Rheem gas water heater model 21v40-38 age of unit
    How old is this unit?
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
     
    #2

    Jan 18, 2014, 11:02 AM
    Locate and read your Rheem water heater serial number
    The serial number identification on all Rheem water heating product
    Rating labels contain ten(10) digits. It follows the example below:

    Serial Number, 12 09 D 01234
    Manufactured 12/2009
    Serial number 01234

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