Water Heater Age Lookup by Serial Number
Upload your water heater’s label or enter its brand and serial number.
Water Heating Experts · Age analyzer
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WHE analyzer
I can help with water heaters across the U.S. Take a clear photo of the label on the outside of your heater, including the brand and serial number. If anything is hard to read, I’ll ask.
No need to remove any covers.
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What this means
This is an estimate from the manufacture date; installation may have been later.
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Water heater age lookup by brand
To find your water heater’s age, check the manufacturer, full serial number and any printed manufacture date on its rating label. Choose a brand below for serial-number guidance, real label photos and official lookup tools. A.O. Smith, Rheem, Bradford White and American use different formats across product generations; the model number alone usually cannot date your individual heater.
A.O. Smith water heater age by serial number
For the modern format illustrated in A.O. Smith’s US service guide, the first two digits identify the year and the next two identify the manufacturing week. Example: 1719… means week 19 of 2017. This is a week number, not a month.
For a worked label example and help with different formats, read our full A.O. Smith water heater age guide.
Older formats can differ. Photograph the whole rating plate: on some formats, scanning the barcode alone can leave out the date code. If the label does not match this example, have A.O. Smith confirm it.
A.O. Smith serial-number guide (PDF, page 10) · Date-code and barcode format notice (PDF)
Rheem water heater age by serial number
Look for a printed manufacture date first. In Rheem’s published serial-number example, 1209D01234 means December 2009: 12 is the month and 09 is the year.
For a worked label example and help with different formats, read our full Rheem water heater age guide.
Use this example only when your label follows that format. If your serial number looks different, use the complete model and serial number to confirm the date with Rheem.
Rheem’s official water-heater age calculator · Rheem serial-number format guide
Bradford White water heater age
Bradford White uses the first letter for the year and the second letter for the month. Its year codes repeat, so the first letter alone does not identify a unique year.
For example, a serial beginning AC indicates March, with A shown as 2004 or 2024 in the manufacturer’s current chart. Older units can belong to an earlier cycle. Confirm the correct year using the full label, model and available installation records.
Bradford White official age chart and model/serial lookup
Stiebel Eltron electric tankless water heater age
Find the model and full serial number on the rating plate. If a manufacture date is not clearly printed, ask Stiebel Eltron’s US support team to confirm it. Do not apply another brand’s date code to this label.
Rinnai gas tankless water heater age
Keep a clear photo of the full model and serial number. Use Rinnai’s support resources to confirm the manufacture date and the warranty information for your particular model.
American water heater age by serial number
American labels can vary by model and production period. Keep the entire serial number and model number when checking an older unit. The manufacturer’s warranty lookup is a useful starting point; ask support to confirm the manufacture date if the result is unclear.
American Water Heaters warranty lookup
State water heater age
Use the full model and serial number with State’s official lookup. Older formats may differ, so do not assume a letter or four-digit prefix has the same meaning on every State water heater. Ask the manufacturer to confirm an uncertain date.
Ruud water heater age
Ruud offers a dedicated water-heater age calculator. Enter the complete serial number from your label there, and keep the model number available if you need help confirming the result.
GE water heater age
GE-branded water heaters include different product generations, including traditional tanks and GeoSpring models. Use GE’s water-heater support guide to identify the correct resource for your model. A general GE appliance chart or a Rheem example should not be applied to every GE water heater.
Water heater age by serial number: quick chart
Serial-number dates vary by brand and manufacturing period. These are examples from manufacturer documentation, not rules for every water heater. If the serial format differs, use the official brand guidance above.
| Brand | Common format or example | What it tells you |
|---|---|---|
| A.O. Smith | 1719… in a documented YYWW format | Manufactured in week 19 of 2017; older series can differ |
| Rheem | 1209D01234 in a documented MMYY format | Manufactured in December 2009; use Rheem’s calculator for other formats |
| Bradford White | AC… (year letter A, month letter C) | March 2004 or March 2024 in the current published cycle; use the full label to resolve the year |
Tips for reading your water heater label
- Find the rating plate. Look for the label with the model and serial number, usually white or silver—not just the large yellow EnergyGuide label.
- Take a clear photo. Include the whole rating plate and every character in the model and serial number. Reduce glare and keep the camera square to the label.
- Check for a manufacture date. It may be labelled “MFG. DATE” or similar. If there is no clear date, open the brand guidance below.
- Keep installation records separately. The manufacture date tells you when the heater was made. An invoice or installation record tells you when it was installed.
A date code can be ambiguous, especially on older equipment. If the format does not match, confirm the full label with the manufacturer or ask WHE for help.
Use the WHE age helper in ChatGPT
Already use ChatGPT? Our existing Water Heater Age and Service Inquiry Expert offers another way to ask about your label. You can enter the brand, model and serial number or provide a clear label photo.
Open the WHE age helper in ChatGPT
This opens ChatGPT, where access and photo uploads depend on your account. AI can misread label characters or date codes. Check the characters it reads and confirm uncertain results with the official brand resources above.
What does the age tell you?
The manufacture date is a useful starting point when discussing maintenance, repairs or replacement. It does not, by itself, confirm warranty coverage, condition or how much life is left in the heater. For typical lifespans and warning signs, read our water heater life expectancy guide. To check coverage, visit our warranty guide by brand.
Checking your water heater’s age for an insurance notice or condo requirement? Ask whether the deadline is based on the manufacture date or installation date, and what documentation is accepted. Our guide explains why insurers and condo associations may require water heater replacement, even when the unit still works.
Tell us about leaks, changes in hot-water supply, recurring problems and any previous repairs, along with the age. We can help you decide what to check next. Considering a replacement? Use our water heater selector to explore sizes and models, and read our Hot Water Heater Guide for an overview of heating methods and temperature considerations.
For local help, email WHE a clear label photo with your city and the problem you are experiencing. You can also explore our repair and maintenance services or water heater installation options.
Water heater age questions
Is the manufacture date the same as the installation date?
No. A heater may have been manufactured before it was installed. Keep the purchase and installation records, and check the warranty terms for your model rather than assuming coverage from its age.
Can I find the age using only the model number?
The model number identifies the product, but it usually does not identify when your individual heater was made. Keep the serial number and any printed manufacture date with the model information.
What if the label is faded or the serial number does not match?
Do not guess missing characters. Try a clear photo with better lighting and check your installation paperwork. Send the information you can read to WHE or the manufacturer for help.
Does an older water heater automatically need replacement?
Age alone is not a diagnosis. Condition, performance, repair history and the problem you are experiencing all matter when discussing repair or replacement.
Questions and comments
Have a question about this article? Share it below. Comments are reviewed before publication. For service, text WHE at 561-602-9062.