Read the plate. Check the evidence.
Find supported Jetglas water-heater date codes, older brand-label context and the separate model number needed for manuals. Confirm the manufacturer and serial system before decoding.
Browse Jetglas manuals and guides →Check a documented system
Water heaters with confirmed manufacturer and numbering family; unrelated devices using the same name are outside these date-code rules.
Choose the equipment family
Match the product, manufacturer and documented serial layout before interpreting a date. The model is a separate label field; a date code alone does not identify capacity, installation date or warranty entitlement.
For Jetglas water-heater labels: the supported tank family uses a year letter and a month letter. Year letters repeat every 20 years, so production-number length and reliable records matter. The documented January 1997 OA exception is separate. The old chart’s separated first/last-letter example is not a modern serial template.
Scope matters
Research reviewed October 16, 2026. This independent tool applies published rules and retains unresolved years and model candidates.
Water heaters only after confirmation of this manufacturer, product family, date-code layout and documented era.
The first two letters give year and month. Manufacturer states seven production digits before December 2007 (DM). Preserve all pre-cutover 20-year alternatives; do not simply choose the latest year. Boundary DM is treated as a transition month. The supplied historical inspection chart lists additional names, but that relationship does not prove the manufacturer of every product bearing the same brand. This option requires independent confirmation from the unit label or model-specific documentation.
Confirm that this is a water heater and that its rating plate or model-specific manufacturer documentation uses this exact numbering family. A historical brand list or a matching serial shape alone is insufficient.
Water heaters only after confirmation of this manufacturer, product family, date-code layout and documented era.
Eight production digits are the post-December-2007 family. A/B/C can still mean 2004/24 etc in the general table, but suffix length rules out dates before the cutover. Explicit calendar date bounds are required. The supplied historical inspection chart lists additional names, but that relationship does not prove the manufacturer of every product bearing the same brand. This option requires independent confirmation from the unit label or model-specific documentation.
Confirm that this is a water heater and that its rating plate or model-specific manufacturer documentation uses this exact numbering family. A historical brand list or a matching serial shape alone is insufficient.
Water heaters only after confirmation of this manufacturer, product family, date-code layout and documented era.
Manufacturer documented a computer-error batch beginning OA, manufactured January 1997. O is not a normal Bradford White year code. The supplied historical inspection chart lists additional names, but that relationship does not prove the manufacturer of every product bearing the same brand. This option requires independent confirmation from the unit label or model-specific documentation.
Confirm that this is a water heater and that its rating plate or model-specific manufacturer documentation uses this exact numbering family. A historical brand list or a matching serial shape alone is insufficient.
Reading your result
Some systems reuse letters or only encode the last one or two year digits. Every supported interpretation is retained. A decade supplied from reliable records can narrow the reading; the tool does not automatically pick the newest year.
Usually the model is a separate plate field. Where published serial ranges actually identify a model, the result shows model candidates and links to their manuals. Overlapping ranges remain ambiguous.
After a lookup, the address includes the serial in a fragment beginning with #serial=. Use “Copy share link” to share the serial and selected context. Opening the link runs the same lookup. The fragment is not a query-string result page.