The Date of Manufacture is coded in the middle group of digits following a letter designation of either “F” or “M” and represent the week and year of production. (Also see the RHEEM slide below for another version of this type of serial number)
The Date of Manufacture is coded in the first four digits and represent the year and month of production.
The Date of Manufacture is coded in the first four digits of the serial number and represent the year and month of production.
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