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Each brand uses its own code.\n\nThe factory label helps identify when the heater was made and which parts fit it. Keep a clear photo with the installation and service records.\n\n[Decode my serial number](<https://mtnmanplumbing.com/water-heater-age-serial-number/#wha-inline-tool>)\n\n\n\nMillcreek field photo · The white plate carries the model and serial\n\nUse the factory label\n\n## Decode the manufacture date.\n\nChoose the printed brand and copy the serial exactly. Add the model when you have it.\n\nBrand Serial number Model optional\n\nWhat the label can prove\n\n## Get the brand, model, and serial in one photo.\n\nCopy the brand, model and serial together. The manufacturer’s serial format provides the date, and the model helps resolve formats that repeat or vary across product lines.\n\nField note · Millcreek\n\n## This heater looked clean. The label still did the talking.\n\nThe factory label carries two useful identifiers: the serial number contains the production date, and the model number identifies the equipment design. Together they help locate replacement parts, warranty records and the correct manual.\n\n\n\nThe factory plate keeps the brand, full model, and serial in one record.\n\n\n\nCount every serial digit: Bradford White changed its trailing production number from seven digits to eight in December 2007.\n\nHow the date is coded\n\n## The serial format changes by brand.\n\n### Bradford White\n\nThe first letter gives the year code and the second gives the month. Year letters repeat every twenty years. The trailing production number helps separate older cycles: seven digits before December 2007, eight afterward. Copy the whole serial.\n\n### Rheem, Ruud, and Richmond\n\nMany newer serial numbers begin with month and year. Some older lines use a different pattern, which is why the brand name alone is not enough.\n\n### A. O. Smith, State, and American\n\nA common format begins with the year and production week. Older heaters can use another format, so we check the complete label before calling the date.\n\n### The pattern does not match\n\nThat means we need a clearer label or a manual check. The result stays “not verified” until the label and date rule match.\n\nRead the evidence\n\n## Three dates. *Three different meanings.*\n\nUse the right date for the question\n\n| Date | Meaning | Where to verify it |\n| --- | --- | --- |\n| Manufactured | When the unit was made, if its serial format is verified. | The factory label and the manufacturer’s serial-number guide. |\n| Installed | When it was put into service, supported by an invoice or record. | The installation invoice or service record. |\n| Warranty started | The date defined by the manufacturer’s warranty terms. | The manufacturer’s warranty terms and registration record. |\n\nA model identifies an equipment family and configuration. A serial identifies the individual unit. Similar-looking model numbers may use different controls, fuels, venting or replacement parts. Copy suffixes and prefixes as printed.\n\n**Keep the dates with their records**\n\nRecord the manufacture date, installation date and later service visits separately. For warranty questions, use the start date defined in the manufacturer’s terms and the supporting installation or registration record.\n\n### Resolve an unclear or repeated date code\n\nKeep a clear photo of the complete label and use the serial-number rule for that manufacturer and equipment family. Some date codes repeat; use the model generation and installation records to resolve the year.\n\nFor parts or warranty approval, verify the result with the manufacturer. Keep the original label photo attached to the service record.\n\nFor example, Bradford White’s KC date code can mean March 1993 or March 2013. Use the model and production era to resolve the year.\n\n [Bradford White: serial format and date codes (page 3) ↗](<https://docs.bradfordwhite.com/Service_Manual/238-54250-00_Current.pdf#page=3>)\n\n### Where these explanations come from\n\nRead the manufacturer and technical references behind this lesson. For service settings, open the manual for your full model number.\n\n- [Bradford White: serial format and date codes (page 3) ↗](<https://docs.bradfordwhite.com/Service_Manual/238-54250-00_Current.pdf#page=3>)\n- [Navien NPE-2 owner’s manual: maintenance and troubleshooting ↗](<https://www.navieninc.com/downloads/npe-2-user-s-information-manual-en/download>)\n\nCommon questions\n\n## Read the manufacture date and check the equipment history.\n\n### Where is the water-heater serial number?\n\nLook for the factory label on the side of the tank or cabinet. Do not use the yellow EnergyGuide label or the installer’s service sticker.\n\n[Link to this answer](<https://mtnmanplumbing.com/water-heater-age-serial-number/#answer-where-is-the-water-heater-serial-number>)\n\n### Why is Bradford White harder to date?\n\nThe year letters repeat every twenty years. For example, KC can mean March 1993 or March 2013. Seven trailing production digits identify the older format; eight identify the newer one introduced in December 2007. The full model and dated records help when the remaining details overlap.\n\n[Link to this answer](<https://mtnmanplumbing.com/water-heater-age-serial-number/#answer-why-is-bradford-white-harder-to-date>)\n\n### Is the manufacture date the installation date?\n\nNo. The heater may have sat in a warehouse before it was installed. Receipts or permit records are better when you need the exact installation date.\n\n[Link to this answer](<https://mtnmanplumbing.com/water-heater-age-serial-number/#answer-is-the-manufacture-date-the-installation-date>)\n\nRelated water-heater guides\n\n## Now decide what that age means for this repair.\n\n- [**Repair or replace** See when a repair is worth making and when replacement is the better use of your money.](<https://mtnmanplumbing.com/water-heater-repair-or-replace/?agentnet=md>)\n\n- [**Tankless error codes** Match the exact brand, model, and displayed code to the manual written for that heater.](<https://mtnmanplumbing.com/tankless-water-heater-error-codes/?agentnet=md>)\n\n [Back to the complete water-heater guide →](<https://mtnmanplumbing.com/water-heater-repair/?agentnet=md>)\n\nHard to read?\n\n## Send the best label photo you can get.\n\nWe’ll identify the heater, verify the age when the serial allows it, and use the same label to check parts or replacement options.\n\n### Exclusive Offers\n\n ● Active Specials\n\nMountain Man Plumbing deals and offers\n\nConnected in your home\n\n## Keep following the plumbing.\n\n- [01 **Water heater repair & learning hub →** Use the model and age to explore the heater’s repair options.](<https://mtnmanplumbing.com/water-heater-repair/?agentnet=md>)\n- [02 **Repair or replace a water heater? →** Weigh condition, service history and available parts.](<https://mtnmanplumbing.com/water-heater-repair-or-replace/?agentnet=md>)\n- [03 **Water heater installation planning →** Plan a replacement when that is the chosen route.](<https://mtnmanplumbing.com/services/water-heater-installation/?agentnet=md>)\n\n[Skip to Footer](<https://mtnmanplumbing.com/water-heater-age-serial-number/#mmp-footer>)\n\nMountain Man Plumbing Sandy, Utah · Salt Lake Valley\n\n[Mountain Man Plumbing logo](<https://mtnmanplumbing.com/?agentnet=md>)\n\nYour local plumber\n\n## Let’s get it fixed.\n\nStrong values. 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