Online Tools & Utilities
Find how old a water heater, furnace or air conditioner is from its serial number
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Free tool to decode water heater, furnace and air conditioner serial numbers and find their manufacture date using manufacturer date-code formats.
Age by Serial Number helps homeowners, buyers and renters find out when a water heater, furnace or air conditioner was manufactured by decoding the date code built into the serial number. The site provides free decoders for each manufacturer's serial date code formats, sourced only from the manufacturer's own published documents, installation and service manuals.
The tool covers major brands including Bradford White, A.O. Smith, Whirlpool, Rheem, Ruud, Lochinvar, Goodman, Amana, Lennox, Carrier, Trane and American Standard. Beyond serial number decoding, the site offers water heater and furnace error code lookups and water heater sizing calculators based on U.S. Department of Energy and ENERGY STAR guidance.
Age by Serial Number is an independent reference not affiliated with any manufacturer. It emphasizes that manufacture date differs from installation date and that equipment condition and maintenance matter more than age alone.
Pricing model: Free
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The serial date code tells you roughly when equipment was manufactured, but not when it was installed. Equipment can sit in a warehouse before installation, and warranties usually run from the installation date rather than the manufacture date.
Age alone does not mean you should replace equipment. Condition, maintenance and safety checks by a licensed professional matter more than the manufacture date.
Date-code formats come only from the manufacturer's own documents, including support pages and installation or service manuals. Sizing guidance comes from the U.S. Department of Energy and ENERGY STAR.
Leave the building immediately and call your gas utility or 911 from outside. Do not attempt to troubleshoot or investigate the smell yourself.
Yes, reading a rating plate is a safe owner task. However, do not open or modify gas appliances, venting systems, carbon monoxide alarms or household electrical circuits. Call a licensed professional for anything beyond the basic owner checks shown on the pages.
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