Your Rheem water heater is a critical appliance providing hot water for everyday needs. Knowing how to locate and read the serial number on your water heater is essential for several reasons. It can help you verify your warranty status, determine your heater’s age, and ensure it’s being properly maintained and repaired.

In this blog post, we’ll show you how to quickly and easily locate and read the serial number on your Rheem water heater. We’ll also explain how to use the serial number to decode your heater’s age and verify your warranty status. By following the steps in this guide, you can ensure that your Rheem water heater runs smoothly and efficiently for a long time.

Finding Your Rheem Water Heating Serial Number

Serial Number Structure

Rheem water heaters have product rating labels, each displaying a unique ten-digit serial number following a particular format. Rheem labels feature a serial number with a specific ten-digit structure. Suppose your serial number is 1209D01234.

  • 12: This represents the month the water heater was manufactured.
  • 09:The two numbers that follow the month indicate the year of manufacturing.
  • D: The single character following the year represents the plant line code.
  • 01234: The remaining five digits are the consecutive serial number.

Where to Find It:

To find the serial number on your Rheem water heater. You can typically locate it on a label or sticker attached to the unit, and familiar locations include:

  • The Side of the Tank: Look for a label near the tank’s exterior.
  • Near the Thermostat Control Panel: Check for a tag near the controls.
  • Inside the Access Panels: Some Rheem water heaters may have serial numbers inside panels that you can easily access.

Using the Serial Number

Once you’ve located the serial number on your Rheem water heater, you can use it to verify the warranty status. Simply visit the Rheem water heater verification tool on their warranty website and enter your serial number. It is handy if you need clarification on the remaining warranty period or need to claim warranty service.

Decoding the Serial Number for Heater Age

Modern Rheem Serial Number Decoder

Rheem tank-type water heaters employ a 10-digit code that reveals the heater’s age. The format is as follows:

  • MM: This two-digit code represents the month of manufacture.
  • YY: The following two digits represent the year of manufacture.
  • X: The next character is the plant code.
  • 12345: The last five digits are a consecutive unique ID.


Let’s break down an example serial number, “RH 0806B17262,” to understand how to decode it:

  • MM: August (08)
  • YY: 2006 (06)
  • X: Plant Code (B)
  • 12345: Consecutive Unique ID

Age Determination

By decoding the serial number, you can determine the exact age of your Rheem water heater. In the example “RH 0806B17262,” it translates to August 2006. This information can be invaluable when planning maintenance or considering a replacement.


Following this guide’s steps, you can quickly and easily locate and read the serial number on your Rheem water heater. Knowing the Rheem water heater serial number can help verify your warranty status, determine your heater’s age, and ensure proper maintenance and repairs.

It is important to note that the serial number decoder outlined in this guide only applies to modern Rheem tank-type water heaters. If you have an older Rheem water heater, you may need to contact Rheem customer service for assistance in decoding the serial number.

Having the serial number for your Rheem water heater on hand can be a valuable asset. Understanding how to read and use the serial number allows you to keep your water heater running smoothly and efficiently for many years.

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