Evidence-led route update
A. O. Smith date-code evidence
If you need to estimate an A. O. Smith water heater’s manufacture age, read the serial from the rating plate rather than the model number.
Record the A. O. Smith year-week prefix with the model
A widely used style begins with two digits for year and two digits for production week (YYWW). The verified A. O. Smith water-heater family begins with year and production week (YYWW). State and American Water Heater pages use that same parent-family evidence with their own label context. The verified A. O. Smith water-heater family uses year and production week at the front of the serial. Capacity, fuel or power, and the complete label keep the YYWW evidence tied to the correct tank or heat-pump family.
Worked example: 0950A12345
0950A12345 — The verified decoder reads this fixture as Week 50 of 2009. The date is a manufacture estimate, not an installation date.
When an A. O. Smith product is commercial or specialty
The common residential fixture is not a universal commercial decoder. If the equipment or label falls outside the documented family, stop at the cautious reference result and use official A. O. Smith support.
Model number vs. serial number
The A. O. Smith model identifies the product family and the serial supplies the age estimate; official support needs both identifiers. Record capacity, fuel or power, model, and serial so official support can distinguish the product family when a warranty question is involved.
Limits and official support
Commercial and specialty A. O. Smith products require confirmation from the full rating plate. If the result affects warranty, registration, parts, safety, or replacement decisions, use the complete model and serial with the manufacturer or a qualified professional. SerialAtlas is an independent reference, not an official warranty lookup or warranty coverage decision.
Open A. O. Smith support routeA manufacturer-published A. O. Smith serial example
The July 2024 A. O. Smith Service and Warranty Guide explains serial 1719106145074 on printed page 9: the first two digits, 17, identify 2017; the next two, 19, identify production week 19. This is a documented manufacturer example, distinct from the illustrative serial used by the tool.
Use that example to understand the year/week arrangement, not to assume every historical or specialty product shares it. The guide separately directs warranty verification to its official portal. A manufacture date does not by itself establish coverage or an installation date.
Read the manufacturer example by position
17 | 19 | 106145074 is the published sample 1719106145074, separated for reading; the bars are not part of the serial. This is the manufacturer’s example, not an observation of your heater.
| Character positions | Sample digits | Documented meaning |
|---|---|---|
| 1–2 | 17 | Manufacturing year 2017 |
| 3–4 | 19 | Manufacturing week 19; not month 19 or an installation date |
| 5–13 | 106145074 | Not interpreted by this age example |
The manufacturer’s explanation on page 9 supports these positions. It does not extend the rule to every historical product. Compare the model-versus-serial guide before using the complete label with the official warranty route below. Source checked October 25, 2026.
- A. O. Smith Service and Warranty Guide, July 2024, page 9 (PDF)
- A. O. Smith official warranty verification
Sources checked October 4, 2026.
How to read a A. O. Smith serial number
A widely used style begins with two digits for year and two digits for production week (YYWW). SerialAtlas removes spacing and punctuation, then applies only the documented rule families mapped to A. O. Smith. The lookup remains in the browser.
Equipment covered
- gas tank water heaters
- electric tank water heaters
- heat-pump water heaters
- selected commercial units
Commercial, imported, very old, specialty, and private-label equipment can use a different code. Confirm the full rating plate before accepting a result.
Where to find the rating plate
- Upper or lower side of the tank jacket
- Near the gas control valve on gas models
- Behind an electrical access panel
- Side or bottom edge of a tankless cabinet
Why more than one date can appear
Two-digit years and repeating letter cycles can point to more than one era. SerialAtlas ranks the plausible dates but keeps materially different alternatives visible. Label design, refrigerant, installation records, and product literature can resolve the era.
Inspector Handbook open reference data (CC BY 4.0). Independently implemented and reviewed August 8, 2026.
Open reference sourceWhat this result does not prove
A manufacture date is not an installation date, warranty decision, recall match, condition assessment, or replacement recommendation. Confirm high-stakes decisions with the manufacturer or a qualified professional.