Whirlpool water heaters use AO Smith\'s serial encoding scheme — same as State and AO Smith Signature.
Where to find the serial
- Data plate on top of unit (most models) or side
- Installation paperwork
- Original packaging label
Decoding format
Whirlpool serials are typically 10-12 characters:
- First 4 digits = year + week (e.g., 2208 = week 8 of 2022)
- Remaining digits = factory sequence
Example: 2215123456 = week 15 (April) of 2022, sequence 123456.
If format is unclear
Call 1-877-817-6750 with the serial — confirmation within minutes.
Cross-check production years
| Model line | Production years |
|---|---|
| NU122 current standard | 2018-present |
| NU161 Energy Smart | 2016-present |
| NU-PWVT Power Vent | 2015-present |
| EU122 standard electric | 2017-present |
| UE6T-H Hybrid Heat Pump | 2014-2022 (limited production now) |
Bottom line
First 4 digits = year/week. Call AO Smith if unclear.