How old is my Rheem unit?
Rheem is part of Rheem Manufacturing. 3 serial formats sourced across central air conditioner, heat pump, furnace, packaged unit, water heater, tankless water heater.
Serial number decoder for Rheem
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 air conditioner 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 air conditioner 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 air conditioner 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.
Decoder pages by product
Central Air Conditioner2 formatsHeat Pump2 formatsFurnace2 formatsPackaged Unit2 formatsWater Heater1 formatTankless Water Heater1 format
Format eras
- era not stated VERIFIED
A#########Central Air Conditioner, Heat Pump, Furnace, Packaged Unit - era not stated VERIFIED
#### A#### #####Central Air Conditioner, Heat Pump, Furnace, Packaged Unit - era not stated VERIFIED
####A#####Water Heater, Tankless Water Heater
Official lookup: the authority
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.