The serial number may be found on the label near the bottom of the water heater.Click to see full answer. Similarly one may ask, how can I tell how old my AO Smith water heater is?The Date of manufacture is coded in the 1st four numerical digits of the serial number. The second set of digits represent the week of manufacture.Also Know, how do I know if my AO Smith water heater has warranty? If you would like to check your warranty, please click on “Heater Info” and select “Verify Warranty.” Thereof, how do you read a water heater serial number? Locate the manufacturer’s label and serial number on the side of your water heater. The sticker is generally above the heater’s warning labels and next to the energy guide. Check to see if the installation date is listed on the sticker. If not, write down the serial code.Where is the manufacture date on a serial number?To determine the age of your appliance, use your serial number (not model number) to find date of manufacture. Our serial numbers begin with two letters followed by six numbers. The 2 letters at the beginning of the serial number tell you the month and year it was made.

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