Water Heater Age Decoder
A.O. Smith water heater age from the serial number
The manufacture date and age of an A.O. Smith water heater, read character by character from A. O. Smith's own date-code documents.
How a A.O. Smith Serial Carries the Date
13 digits: YY (year) + WW (week) + 9 digits (the 13-digit form A. O. Smith's Service and Warranty Guide prints (Dec. 2018 and July 2024 editions); a year after the current one is refused).
| Format | Layout | When |
|---|---|---|
| A. O. Smith, the Service and Warranty Guide's serial matrix | 13 digits: YY (year) + WW (week) + 9 digits | the 13-digit form A. O. Smith's Service and Warranty Guide prints (Dec. 2018 and July 2024 editions); a year after the current one is refused |
Worked Examples
1719106145074
This is the worked example in A. O. Smith's Service and Warranty Guide. The tool reads it as week 19 of 2017, about 9 years old in 2026.
Each line above is the decoder's own answer for that serial, worked out in 2026.
Frequently Asked Questions
How do I tell how old my A.O. Smith water heater is from the serial number?
13 digits: YY (year) + WW (week) + 9 digits (the 13-digit form A. O. Smith's Service and Warranty Guide prints (Dec. 2018 and July 2024 editions); a year after the current one is refused). Enter the serial in the decoder on this page and it shows the date, the age and which characters it read, or says why this serial cannot be resolved to one date.
Which documents is the A.O. Smith decode read from?
"Service and Warranty Guide for Contracted Service Providers", published by A. O. Smith (its university.hotwater.com training site) and A. O. Smith (its hotwater.com document host).
How do I check the warranty on an A.O. Smith water heater?
No A.O. Smith warranty lookup is linked here. This tool does not read the maker's records, so it cannot show this tank's warranty or whether it was registered.
Related
Water Heater Age Decoder
The decoder with its brand picker, and the documents behind each format.
Bradford White water heater age
Decode a Bradford White serial on its own page.
Rheem water heater age
Decode a Rheem serial on its own page.
Ruud water heater age
Decode a Ruud serial on its own page.
Richmond water heater age
Decode a Richmond serial on its own page.
Heat Pump Water Heater Circuit
Breaker and wire for the replacement once the old tank dates out.