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State Water Heater Age by Serial Number
Enter the serial number from your State water heater's data plate to get its manufacture date, remaining life, warranty and recall status, and a repair-or-replace recommendation.
How to read a State serial number
We can decode serial numbers from State water heaters built 2004–2007 and 2011–2026. We can't decode units built in 2008–2010 yet.
2011–2026 format
On State water heaters made since 2011, the first two digits of the serial number are the year and the next two digits are the week of that year (01-53). For example, a serial starting 1631 was made in the 31st week of 2016 (early August). Some State serials have a letter after these four digits; it does not change the date.
2004–2007 format Corroborated
On State water heaters made from 2004 to 2007, the serial number starts with a letter for the month, then two digits for the year. For example, a serial starting G05 was made in July 2005, and M07A072884 was made in December 2007. Month letters run A (January) through M (December), skipping I.
This format is confirmed by two or more independent references rather than a State document for this product line, so treat dates from it as likely rather than certain.
2004 format Corroborated
Some State water heaters made in the first half of 2004 have two letters at the start of the serial: a factory letter, then a month letter, then two digits for the year. For example, a serial starting MA04 was made in January 2004, and one starting AF04 in June 2004.
This format is confirmed by two or more independent references rather than a State document for this product line, so treat dates from it as likely rather than certain.
Worked examples
year month / week
| Serial | Built |
|---|---|
| 16310000000 | August 2016 |
| 11150000000 | April 2011 |
| M07A072884 | December 2007 |
| L07A144966 | November 2007 |
| G05A000000 | July 2005 |
| J04A000000 | September 2004 |
| MA04A000000 | January 2004 |
| AF04A000000 | June 2004 |
How long does a State water heater last?
| Type | Typical life |
|---|---|
| Gas tank | 8–12 years |
| Electric tank | 10–14 years |
| Heat pump water heater | 10–14 years |
| Tankless | 15–20 years |
Ranges come from industry life-expectancy studies (NAHB/Bank of America, InterNACHI, DOE) and apply across brands. Your result adjusts for your state's climate and water hardness.
Is my State water heater still under warranty?
- State tank models with warranty code G6, S6 or N6 in the model number (for example EN6-40-DORS) have a 6-year tank and 6-year parts warranty.
- State tank models with warranty code E8, W8 or N8 have an 8-year tank and 8-year parts warranty.
- State tank models with warranty code GX, NX or SX (for example GSX 50 RCT) have a 10-year tank and 10-year parts warranty.
- State whole-home electric tankless models (R2VS and R4LS/R4MS series) have a 5-year heating chamber warranty and a 1-year parts warranty.
Registering a State water heater is optional and does not reduce your warranty rights. Keep your proof of purchase and installation: State uses it to set the warranty start date.
State water heater recalls
- CPSC, A.O. Smith Announce Recall of Water Heaters (A. O. Smith, Reliance, Apollo, State, Maytag brands) (2005)
- A.O. Smith Recalls Gas Water Heaters Due to Fire and Carbon Monoxide Hazards (A. O. Smith and State brands) (2008)
- A. O. Smith Recalls Ultra-Low NOx Water Heaters Due to Fire Hazard (American, A. O. Smith, Kenmore, Reliance, State, U.S. Craftsmaster, Whirlpool brands) (2018)
Recalls come from the U.S. Consumer Product Safety Commission. Decode your unit above to check whether its model and serial fall inside a recall.
Should you repair or replace it?
Once you decode your unit, we compare its age against its typical life, a typical major repair against the cost of replacing it, and, with your model and state, what a new unit would save on energy. A common rule of thumb: if a repair costs more than about 30–50% of a replacement and the unit is past mid-life, replacing usually wins.
Related brands
State belongs to the same company as A. O. Smith and American Water Heater. Serial formats are often, but not always, shared.
FAQ
How do I tell how old my State water heater is?
The manufacture date is encoded in the serial number on the unit's data plate. On State water heaters made since 2011, the first two digits of the serial number are the year and the next two digits are the week of that year (01-53). For example, a serial starting 1631 was made in the 31st week of 2016 (early August). Some State serials have a letter after these four digits; it does not change the date. On State water heaters made from 2004 to 2007, the serial number starts with a letter for the month, then two digits for the year. For example, a serial starting G05 was made in July 2005, and M07A072884 was made in December 2007. Month letters run A (January) through M (December), skipping I. Some State water heaters made in the first half of 2004 have two letters at the start of the serial: a factory letter, then a month letter, then two digits for the year. For example, a serial starting MA04 was made in January 2004, and one starting AF04 in June 2004. We can decode State water heaters built 2004–2007 and 2011–2026. We can't decode units built in 2008–2010 yet. Enter the serial above to decode it automatically.
How long does a State water heater last?
Typical lifespans: Gas tank 8–12 years; Electric tank 10–14 years; Heat pump water heater 10–14 years; Tankless 15–20 years. These ranges apply across brands. Maintenance, climate and water hardness move a unit toward one end.
How do I check my State warranty?
Registering a State water heater is optional and does not reduce your warranty rights. Keep your proof of purchase and installation: State uses it to set the warranty start date. State's warranty lookup: https://www.statewaterheaters.com/support/warranty-verification.html Register a unit: https://www.statewaterheaters.com/on/demandware.store/Sites-state-Site/default/ProductRegistrationForm-Show
Has my State water heater been recalled?
The U.S. Consumer Product Safety Commission lists 3 recalls for State water heaters. Enter your model and serial above to check yours against each recall's scope.
Sources: State service, warranty and installation documentation; independent industry references for formats no State document covers; U.S. Consumer Product Safety Commission; DOE and ENERGY STAR; NAHB/Bank of America and InterNACHI life-expectancy studies. More about our sources.