Manufacture date reference
How old is my Rheem / Ruud?
Independent guide. Not affiliated with, endorsed by or sponsored by Rheem, Ruud or their parent company. Rheem and Ruud are trademarks of their owner, used only to identify the products.
Last verified: . Rules can change, so confirm with the manufacturer.
Read a date, keep the uncertainty
Check a date code
Read only the first four numeric date-code characters. This tool runs in your browser. It does not send or save your code. Do not enter the rest of the serial number.
Other eras and serial styles may use different codes. Confirm the format before relying on an estimate.
Unclear until you confirm the format and check a date code.
The manufacture date shown by the serial number is not the same as your warranty start date. Most warranties run from the installation or purchase date and can depend on registration and proof of purchase. Only Rheem or Ruud can confirm whether your unit is covered.
Rheem water-heater rating labels described by the cited manufacturer page. HVAC units and other serial layouts are not covered. Ruud has a separate evidence limitation below.
Reading the manufacture date code
The described rating label has 10 characters. The first two indicate a month from 01 to 12; the next two are the year code. The fifth identifies a plant line, with the remaining five identifying the unit sequence. The manufacturer page does not specify the century or the date range for this convention.
Manufacturer's published rule, as stated on Rheem's page on 2026-11-05.
Source details and checked dates
Worked examples
- Example only (made-up serial number)
0318AXXXXXIllustrative month 03, year code 18; century and full age remain unclear.
- Example only (made-up serial number)
0921AXXXXXIllustrative month 09, year code 21; century and full age remain unclear.
- Example only (made-up serial number)
0615AXXXXXIllustrative month 06, year code 15; century and full age remain unclear.
The X characters are placeholders, not a complete unit serial number.
What remains unclear
- The century is unclear; this guide does not convert the year code into a full year or exact age.
- Start and end dates for this label convention are unclear.
- Other water-heater styles and all HVAC date codes are not decoded.
- The location of the rating label on the tank is unclear from this source.
Ruud
Ruud is a Rheem brand; Rheem's published rule is commonly reported to apply. Verify with Ruud.
Commonly reported; not confirmed by Ruud.
The Rheem source cited above is the source for this reported family relationship; it is not a separate Ruud-published decoding confirmation.
Corrections and freshness
Send corrections or takedown requests to contact@warrantyclaimguide.com. We correct or remove content within 5 business days of a credible request. Rules can change, so confirm with the manufacturer.