A.O. Smith Water Heater Age by Serial Number
Decode your A.O. Smith serial number to find the manufacturing date, age, and full specs. Free and instant — no account needed.
A.O. Smith Water Heater Age & Model Info
Brand: A.O. Smith (pre-selected)
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Finding Your A.O. Smith Serial Number
Check these four spots on your A.O. Smith water heater
Common Locations
What to Look For
- White or metallic manufacturer sticker
- Labeled "Serial No." or "S/N"
- Typically 8–12 characters long
- Usually near the model number
Can't find it? Try removing access panels or checking behind the temperature dial.
A.O. Smith Serial Number Examples
Don't worry if yours looks different — A.O. Smith has multiple formats and our system can decode most variations.
About A.O. Smith Water Heaters
A.O. Smith water heaters represent over 150 years of American manufacturing excellence, dating back to 1874 when the company began operations in Milwaukee, Wisconsin. Today, A.O. Smith stands as North America's largest manufacturer of residential and commercial water heating equipment, serving millions of homes and businesses. The company operates under multiple respected brands and maintains a reputation for engineering innovation and quality construction that has made their products a top choice for professional installers and homeowners alike.
A.O. Smith water heaters span an impressive range of technologies including traditional tank-style gas and electric models, high-efficiency condensing units, tankless systems, and cutting-edge hybrid heat pump models. Their Vertex line delivers up to 96% thermal efficiency for commercial applications, while the Signature Premier series offers residential customers advanced features like electronic ignition and self-diagnostic systems. Many models carry ENERGY STAR certification and feature industry-leading warranties, with premium residential units backed by up to 12-year tank coverage. The company invests heavily in corrosion-resistant materials, including their proprietary Blue Diamond glass coating and commercial-grade anode rods.
Owners of A.O. Smith water heaters benefit from extensive parts availability through a nationwide network of authorized dealers and service centers. The company provides detailed installation manuals, troubleshooting guides, and online warranty registration tools that simplify maintenance and service needs. Professional contractors appreciate A.O. Smith's consistent serial number formatting and model nomenclature, which clearly indicates manufacturing dates, capacity specifications, and fuel types. Customer support includes technical assistance lines staffed by trained specialists who can help diagnose issues and locate qualified service providers in your area.