State Water Heater Age Lookup
State water heaters - Premier, Patriot, ProLine, and Select - use a clear date code in the serial number. Enter yours to find the exact build date and current age. No cost, no account.
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Finding Your State Serial Number
Check these four spots on your State water heater
Common Locations
What to Look For
- White or metallic manufacturer sticker
- Labeled "Serial No." or "S/N"
- Typically 8–12 characters long
- Usually near the model number
Can't find it? Try removing access panels or checking behind the temperature dial.
State Serial Number Examples
Don't worry if yours looks different - State has multiple formats and our system can decode most variations.
About State Water Heaters
State Industries started in Ashland City, Tennessee in 1946 and became part of A.O. Smith in 2001. It sells through plumbing wholesalers rather than retail, and its plants also produce the tanks badged as Reliance and the Maytag branded water heaters from the Series Nine era, which is why a Maytag model number resolves to State specifications.
The range runs wider than most residential brands, from 2.5 gallon point of use units up to 120 gallon commercial tanks, in gas, electric, power vent, and heat pump configurations. ProLine and ProLine XE are the residential families; Sandblaster is the commercial line built for continuous duty. Everkleen dip tubes stir sediment off the tank floor on gas models, which is the feature most often cited when a contractor recommends State for hard water.
Two details make State plates easier to read. First, the serial format changed: modern units start with the two digit year and the production week, so 1024123456 is week 24 of 2010, while units built before mid 2004 used letter codes, either a factory letter followed by a month letter, or a month letter followed by the year. Second, the three digit number printed after the model number is a parts revision code, not a variant, so a trailing 300 or 400 does not describe a different tank and can be ignored when matching specifications.
Where to find the serial
State Industries rating plates are on the upper third of the tank, printed in black on a silver foil background. The serial is labeled SERIAL or SER. NO. and sits below the model number. On larger commercial Sandblaster units the label is moved to the side panel for accessibility.
What the serial actually looks like
Why the age is worth knowing
State residential tanks typically come with 6, 9, or 12 year tank warranties. Commercial Sandblaster units have shorter coverage but the heavier construction often lasts well past warranty. After year 8 on a residential unit, the anode rod is usually fully consumed and the tank is on borrowed time.
Quick answers for this brand
Is State Industries still a separate company?
State Industries became part of A.O. Smith in 2001 and now operates as a brand rather than a standalone company. The Ashland City, Tennessee headquarters is still where State branded tanks come from, but engineering and parts are shared with the rest of the A.O. Smith family.
Where can I buy a State water heater?
State is sold through plumbing wholesale distributors and not at Home Depot or Lowe's. You typically get one when a plumber recommends it for a replacement or new construction job. Parts are widely available through plumbing supply houses nationwide.
What's the difference between State Proline and Sandblaster?
Proline is the residential line, Sandblaster is the heavy-duty commercial line. Sandblaster units have larger anode rods, thicker insulation, and tougher tank construction designed for high-recovery commercial use. Both decode age the same way from the serial.
Time to repair or replace your water heater?
Compare free quotes from top-rated local pros near you.
Protect your water heater and 20+ home systems with a home warranty
Share this tool with friends!
Know someone with an aging water heater? Send them a free check.