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    Rheem® HVAC Age Checker

    Enter your Rheem serial number below to determine the manufacturing year of your HVAC system

    The serial number is usually found on a label on your HVAC unit

    Add model number for AI-powered specs including tonnage, SEER rating, and features

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    How to Find Your Serial Number

    Your Rheem serial number can typically be found on:

    • A metal nameplate on the outdoor condensing unit
    • Inside the air handler or furnace cabinet door
    • On the rating plate near the electrical connections
    • On your original installation documentation

    Rheem Serial Number Formats

    Style 1: Plant + Factory Code Format

    Example: WF1703123456 - Plant code (W) + Factory code (F) + Week (17) + Year (03) + Serial

    Styles 2-4: Factory Letter Format

    Examples: CB5D302F099903346, 7351M280616735, OR177M280700097

    Factory letter (F, M, G, W, N) followed by Week + Year. Factory codes: F=Fort Smith AR, M=Milligeville GA, G=Greenville MS, N=Nuevo Laredo Mexico

    Style 5: Water Heater Format (10-digit)

    Example: 0804B10488 - Month (08) + Year (04) + Plant Line Code + Serial. Also found on older HVAC systems.

    Style 6: Discontinued Format (Mid-1970s and Prior)

    Example: 123451872 - Last 2 digits = Year, 3rd-4th from last = Week. Old water heater style also used on older HVAC.

    About Rheem HVAC

    Rheem Manufacturing Company has been producing heating and cooling equipment since 1925. Known for their reliability and innovation, Rheem also manufactures equipment under the Ruud brand name. Both brands share similar serial number formats and manufacturing processes.