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Age by Serial Number

Verified by @the-creatorWorking

Decode a water heater or HVAC serial number to find its build date

What it's for

  • find out how old a water heater is
  • decode a furnace serial number date code
  • check an AC unit's age before replacing it
Show 1 more
  • look up a water heater error code
Runs in the browser3 checksEveryday tools
Open Age by Serial NumberChecked agebyserialnumber.comLast change recorded

We have checked Age by Serial Number 3 times since 1 Nov 2026, and it answered every time. Its visible text has not changed since we started watching.

What it does

Age by Serial Number works out when a water heater, furnace or air conditioner was built by decoding the date code inside its serial number, using each manufacturer's own published format. Brands covered include Bradford White, A. O. Smith, Whirlpool, Rheem and Ruud, Lochinvar, Goodman and Amana, Lennox and Carrier. Where a maker publishes no residential decoder, as the site says of Trane and American Standard, it says so and explains how that manufacturer tells owners to find the date instead. Error-code references and sizing calculators sit alongside the decoders.

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Each answered its most recent check.

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What stands out

  • Free

What we checked

  • App accessible

    The last check reached a working page.

  • Page rendered

    We opened this page in a browser and kept a picture. That is not the full route probe.

  • Screenshot kept

    We captured a picture of the page.

  • Looked at by a person

    A person last reviewed this listing.

Looked
0

0 browsers

Opened
0

0 browsers

Checks
3

3 checks

Watching
0

Nobody yet

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Screenshot of Age by Serial Number
Screenshot from our last capture

Evidence

Each bar is one request we made
Checks
3
Working · last 3
100%
Median response
81ms
Watching since
1 Nov 2026

Of the last 3 checks, 3 answered (100%); the latest was on . Median response 81 ms. Watching since .

Activity

Watching since
Last content change
None seen yet
Unchanged for
Under a day
Certificate expires
in 72 days

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Age by Serial Number — still works
[![Age by Serial Number — still works](https://itstillworks.app/api/badge/age-by-serial-number)](https://itstillworks.app/verify/age-by-serial-number)