American Water Heater Age Checker
Decode your American serial number to find the manufacturing date, age, and full specs. Free and instant - no account needed.
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Finding Your American Serial Number
Check these four spots on your American 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.
American Serial Number Examples
Don't worry if yours looks different - American has multiple formats and our system can decode most variations.
About American Water Heaters
American Water Heater Company has provided reliable water heating solutions since 1930, building a reputation for quality manufacturing and dependable performance across residential and commercial markets. Operating as part of A.O. Smith Corporation, American maintains its brand identity while benefiting from advanced engineering resources and manufacturing capabilities. The company focuses on delivering value-oriented products that meet essential performance requirements without unnecessary complexity or premium pricing. American water heaters are distributed through professional wholesale channels to contractors and plumbers who appreciate straightforward installation, readily available parts, and consistent product quality for their customers.
American manufactures both gas and electric tank-type water heaters with capacities ranging from 30 to 100 gallons for residential use, plus larger commercial models for apartments, offices, and light commercial applications. The Proline series represents their core residential offering with features including self-diagnostic gas valves, quality tank construction with vitreous enamel coating, and magnesium anode rods for corrosion protection. Power-vented models accommodate installations where standard atmospheric venting is not feasible. Commercial units incorporate heavy-duty components designed for continuous operation and high-demand scenarios. While American emphasizes practical functionality over premium features, their products meet industry efficiency standards and provide reliable hot water delivery for everyday household needs.
American Water Heater Company backs its products with standard warranty protection typically covering 6 years on residential tank models, with terms clearly outlined in product documentation. The extensive wholesale distributor network ensures ready availability of replacement parts and service support through local plumbing professionals. Installation manuals provide clear instructions for proper setup and code compliance. Technical support is available through distributor partners and the company's customer service resources. American water heater serial numbers follow straightforward formatting conventions that typically indicate manufacturing year and month, allowing service technicians to quickly determine unit age when evaluating maintenance needs or planning replacements for aging equipment.
Where to find the serial
American Water Heater (sold under the American brand and as Polaris) puts the rating plate on the top portion of the tank. The serial number is in a black box near the top of the label and is labeled SER NO. Polaris condensing units have the label on the side panel instead.
What the serial actually looks like
Why the age is worth knowing
American residential tanks typically have 6 or 9 year tank warranties, while Polaris condensing units get 10 years and run much hotter and harder. After year 10, even Polaris units start showing combustion chamber wear and the secondary heat exchanger needs annual cleaning to maintain efficiency.
Quick answers for this brand
Is American Water Heater related to A.O. Smith?
Yes, American Water Heater Company was acquired by GSW in 2002, and GSW was acquired by A.O. Smith in 2006. The Johnson City, Tennessee plant still produces American branded tanks alongside U.S. Craftmaster, Envirotemp, and several house brands using the same serial format.
What is the Polaris water heater and how do I age it?
Polaris is American Water Heater's high-efficiency condensing residential unit with a stainless steel tank and submerged combustion chamber. The serial decodes with the standard YYWW format, but the rating plate is on the side cover panel rather than the top of the tank.
Where is American Water Heater sold?
American branded units are sold primarily through plumbing wholesalers, with some appearance at Menards and regional retailers. They're often the lower-cost option in the A.O. Smith family, but the tanks themselves come off the same lines as the more expensive A.O. Smith models.
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