Using the chart below, a serial number of WC9876553 would have been built in the year 2000 and in the month of March. A serial number beginning with KA would have been built in January of 1993. The remainder of the serial is just a sequential number.
|Year of Manufacture (1st Letter of Serial Number)||Month of Manufacture (2nd Letter of Serial Number)|
† For the Year column, we do not use the letters: I, O, Q, R, U, V
‡ For the Month column, we do not use the letters: I, and N through Z
* Due to a computer error there were some OA serial water heaters manufactured. They were built in January of 1997.