![]() ![]() The format changed slightly for heaters made in subsequent years. Unfortunately, AO Smith has been changing the format of the serial numbers over the years, so you need to understand the style to interpret the manufacture date correctly.įor example, AO Smith water heaters made before 2008 have serial numbers representing the year and month (the first four numbers). The manufacture date of AO Smith water heater is in the serial number. Finding the Manufacture Date on AO Smith Water Heater For example, if the first four numbers are 1125, the heater was made in the 25th week of the year 2011. If the heater’s first two numbers are 08, 09, and above, then the following two digits represent the week. In heaters manufactured after 2008, the third and fourth digits show the week instead of the month.įor example, serial number ⁔13334, the first four numbers (0205) show the water heater was made in May 2002. In water heaters manufactured before 2008, the first two numbers tell the year, while the next two represent the month. ![]() The AO Smith water heater date code is evident in the first four numbers on the serial number. I needed to know how soon I should expect to replace it because the house was old. “How can I tell how old my ao smith water heater is?” is one of the questions I had after discovering the type and make of the heater in the home I had just bought. Ways To Tell the Age of an AO Smith Water Heater I’ll discuss the AO Smith water heaters model numbers and how to interpret the various series numbers to tell the age of your heater. For heaters made post-2008, the first two digits represent the year, while the third and fourth digits indicate the week. In heaters built before 2008, the four numbers after the first letter show the year and month. You can find how old your AO Smith water heater is from the serial numbers. ![]()
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