How old is my Rheem furnace?
Serial number age decoder for Rheem furnaces: 2 format eras, the decode rule in plain English, transcribed tables, and the official lookup.
Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.
Format example: W291013412
- Rheem furnace serial numbers in the era not stated format encode the year as digits 4-5 (YY) and the week as digits 2-3 (source: building-center.org).
- Example: serial W291013412 decodes to week 29 of 2010.
- Rheem furnace serial numbers in the era not stated format encode the year as digits 3-4 after the middle factory letter and the week as digits 1-2 after the middle factory letter (source: building-center.org).
- Example: serial 7351 M2806 16735 decodes to week 28 of 2006.
- Rheem's official lookup at rheem.registermyunit.com returns warranty terms and coverage.
Format eras
- era not stated VERIFIED
A#########digits 4-5 (YY) - era not stated VERIFIED
#### A#### #####digits 3-4 after the middle factory letter
How to read the serial
era not stated formatVERIFIED
Shape A######### · example W291013412 · confidence high
- Year
- digits 4-5 (YY)
- Week or month
- week = digits 2-3
- Plant
- letter 1 (e.g. W)
Example: serial W291013412 decodes to week 29 of 2010.
era not stated formatVERIFIED
Shape #### A#### ##### · example 7351 M2806 16735 / CB5D302F099903346 / OR177 M2807 00097 · confidence high
- Year
- digits 3-4 after the middle factory letter
- Week or month
- week = digits 1-2 after the middle factory letter
- Plant
- middle letter F, M, G, W or N
Example: serial 7351 M2806 16735 decodes to week 28 of 2006.
Where the data plate is on a furnace
Inside the furnace: remove the upper (burner) access door and look on the inside of the door, on the blower compartment wall, or on a sticker facing you at the burner deck.
General guidance, not brand-specific: the owner's manual or the installer can point to the exact spot. See the data plate guide.
For scale only: the InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Furnace at 15 to 25 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.
Open the official Rheem lookup takes serial number; returns warranty terms and coverage; URL verified live
This site is a reference built from published tables. The manufacturer's own lookup wins whenever the two disagree.
Sources
- https://www.building-center.org/rheem/
- https://rheem.registermyunit.com/en-US/warranty/brand?brand=rheemofficial
Frequently asked questions
How do I tell the age of a Rheem furnace from the serial number?
In the era not stated format the year is digits 4-5 (YY) and the week as digits 2-3. Example: serial W291013412 decodes to week 29 of 2010.
Where is the serial number on a Rheem furnace?
On the data plate. Inside the furnace: remove the upper (burner) access door and look on the inside of the door, on the blower compartment wall, or on a sticker facing you at the burner deck.