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A.O. Smith water heater age

How old is my A.O. Smith water heater?

The first four digits of an A.O. Smith serial number are the year and week it was made. Enter yours to decode it.

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Decode your serial number

Your serial number stays in your browser. It isn’t sent to us or stored unless you choose to save it to your home.

Photograph the label instead

Photo reading needs a free account and your permission to use an external AI service. It reads the text only; the date is always worked out from the manufacturer rule.

How the date code works

  1. Digits 1–2: year. 20 means 2020.
  2. Digits 3–4: week. A.O. Smith’s example is week 37 of 2020, September 7–13, 2020.
  3. The rest isn’t date information.

Older A.O. Smith heaters used other layouts that the published guide doesn’t explain. So we only read year codes from 2009 onward, and say “unable to determine” for anything else. The guide comes from A.O. Smith’s international site. Check the printed date on your label if you have one.

Source: A.O. Smith — Production date of my device. Aruvello is not affiliated with A.O. Smith.

Where to find the serial number

The rating label is on the side of the tank, usually in the upper half. The serial number is printed next to the model number.

Age, installation and warranty

This is the date the heater was made, not when it was installed. To check coverage, use A.O. Smith warranty verification. Aruvello doesn’t determine coverage.

Other brands: see which brands we support.

Questions homeowners ask

My serial starts with a letter. Can you read it?
Not yet. Letter-first A.O. Smith serials aren’t covered by the guide we use, so we won’t guess.
Does this cover State or American water heaters?
No. Those brands are made by the same company, but we haven’t checked their labels against a published guide.
Is my water heater too old?
The date alone can’t tell you that. Ask a licensed plumber to inspect it.

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