Supported format
| Pattern | YYWW + plant letter + six-digit sequence; the published all-numeric variant is also supported |
|---|---|
| Example | 1203M001714 |
| Interpretation | Week 3 of 2012 |
How to use the result
Copy the full serial from the rating plate without guessing ambiguous characters. Enter the complete model number too: the serial-date and recall checks are independent, and full model text can materially strengthen a recall candidate.
Important limitation
The manufacturer-family guides show both numeric and plant-letter forms. Older, tankless, and alternate State formats remain unsupported rather than being coerced.
The resulting manufacture date does not establish installation date, condition, remaining service life, warranty, or safety. Confirm critical decisions with State or a qualified professional.
Recall checking
Water Heater Lookup screens the current CPSC water-heater feed and links every candidate to its official notice. Compare the complete model, manufacture window, fuel, components, and other label details. An empty search is not an all-clear.