There is a lot of information in A.O. Smith’s water heater serial numbers, like when the unit was made. With your unit’s serial number, it’s easy to figure out the year of the manufacturer. In this post, I’ll discuss determining how old your A.O. Smith water heater is based on its serial number.
A.O. Smith Serial Number Lookup
The year the units were made is shown by the first two digits of the serial number, which may come after one or two letters. If your heater was made before 2008, the next two numbers tell you what month it was made. If your heater was made after 2008, the next two numbers tell you what week it was made.
Serial number example
Serial number #18360123456789
18 = 2018
36 = week 36
0123456789 = sequential number
Based on the above A.O. Smith water heater serial number, the unit was manufactured in 2018.
Serial number #U0302012345
01 = January
02 = 2002
012345 = sequential number
Based on the above A.O. Smith water heater serial number, the unit was manufactured in March 2002.
Serial number #1056A0012345
01 = 2010
02 = week 56
A012345 = sequential number
This serial number style is similar to the State water heater. Based on the above serial number, the unit was manufactured in 2010.
Where can you find the serial number on an A.O. Smith water heater? The serial number is printed on the sticker plate located near the bottom of the water heater.
About A.O. Smith
A.O. Smith is a popular brand of water heater for both homes and businesses. Their line of water heaters includes GSW, John Wood, Whirlpool, U.S. Craftmaster, American, State, Reliance, Kenmore, Takagi, and Lochinvar.
Here are some things to keep in mind when using the serial number to figure out the age of the A.O. Smith water heater you have: The year of the manufacturer can be found in the first four numbers of the serial number. The first two numbers show the year, and the last two show the week the item was manufactured.