How old is my Rheem water heater?
Serial number age decoder for Rheem tank water heaters: 1 format era, 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: 0804B10488
- Rheem water heater serial numbers in the era not stated format encode the year as digits 3-4 (YY) and the month as digits 1-2 (MMYY prefix) (source: building-center.org).
- Example: serial 0804B10488 decodes to August 2004.
- Rheem's official lookup at rheem.registermyunit.com returns warranty terms and coverage.
Format eras
- era not stated VERIFIED
####A#####digits 3-4 (YY)
How to read the serial
era not stated formatVERIFIED
Shape ####A##### · example 0804B10488 · confidence high
- Year
- digits 3-4 (YY)
- Week or month
- month = digits 1-2 (MMYY prefix)
- Plant
- letter at position 5
Example: serial 0804B10488 decodes to August 2004.
Where the data plate is on a water heater
The rating plate is a large label on the side of the tank near the top or beside the control. The serial is printed on it, often beside the model number and the ANSI standard line.
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 Water Heater (conventional) at 6 to 12 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://www.rheem.com/faq/official
- https://rheem.registermyunit.com/en-US/warranty/brand?brand=rheemofficial
Frequently asked questions
How do I tell the age of a Rheem water heater from the serial number?
In the era not stated format the year is digits 3-4 (YY) and the month as digits 1-2 (MMYY prefix). Example: serial 0804B10488 decodes to August 2004.
Where is the serial number on a Rheem water heater?
On the data plate. The rating plate is a large label on the side of the tank near the top or beside the control. The serial is printed on it, often beside the model number and the ANSI standard line.