Energy Saver Water Heater Serial Number Lookup & Age
Find supported Energy Saver water-heater date codes, older brand-label context and the separate model number needed for manuals. Confirm the manufacturer and serial system before decoding.
Water heaters with confirmed manufacturer and numbering family; unrelated devices using the same name are outside these date-code rules.
Explore a sourced example:
Choose the equipment family
Energy Saver serial numbers by device type
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.
Energy Saver historic Lochinvar tank water heaters
This name appears as a historic Lochinvar tank trade name in the supplied chart and a regulatory manufacturer/model list. Apply only the confirmed tank-family letter-year/month or year/week system that matches the actual label and era. The name alone does not establish a current boiler model or a universal serial format.
Manufacture date is different from installation, purchase and warranty start dates.
Enter the separate model number from the rating plate to search for the correct manual. These date positions do not establish a full model, capacity, fuel type or warranty entitlement.
The historical inspection chart is secondary evidence of listed brand relationships, not proof of the manufacturer, product family or date system on a particular unit. Confirm the actual label and select the matching system explicitly.
A missing match does not establish age, authenticity or condition. Unsupported eras and device types require the manufacturer or model-specific documentation.
Energy Saver is a generic descriptor. Treat only the Lochinvar-associated historic line shown in the chart, not every product bearing an efficiency label.
Only the confirmed Lochinvar-associated legacy tank family is covered here. Do not apply these options to unrelated products with the same efficiency description or name.
Research reviewed October 16, 2026. This independent tool applies published rules and retains unresolved years and model candidates.
Only Lochinvar PDF page age 2 listed legacy tank families; the exact printed year map 1993–2012, not an assumed repeating cycle.
The chapter heading lists families ending 2011, but its printed year table includes J=2012. Both facts are disclosed. Older 1979–1992 units are within some family headings but their year mapping is not proved by this table. No 1964/1984 cycle extrapolation is applied to Lochinvar. Six/seven numeric suffix positions are production identifiers, not quantity.
Select only after confirming the water heater or boiler family and numbering system described here. Brand ownership alone does not establish this system.
Lochinvar tank-family YYWW/plant system 2011 onward
Only the 2011-onward tank-family list on Lochinvar PDF page age 2.
The manufacturer chart explicitly lists weeks 01–52 and a fifth-character manufacturing-plant code. It does not publish plant geography or an exact Gregorian date. Do not borrow the other manufacturer group’s week 53 allowance for this chart.
Select only after confirming the water heater or boiler family and numbering system described here. Brand ownership alone does not establish this system.
Reading your result
Energy Saver lookup questions
Why does the year code match more than one year?
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.
Does the serial identify my exact model?
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.
Can I share the result?
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.