Determining the age of a Whirlpool water heater requires decoding the serial number stamped on the rating label affixed to the outer steel tank. For units manufactured by the American Water Heater / A.O. Smith subsidiary, the first two digits of the serial number represent the year of manufacture, while the third and fourth digits designate the production week of that year (following a standard YYWW format). For example, a serial number starting with 1032 indicates the tank was manufactured during the 32nd week of 2010.
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