Residential & Commercial Water Heaters
How Old Is My State Water Heaters?
Type the serial number from the rating label on your State Water Heaters water heater to see when it was made and how much of its typical 10-year life is left.
Try an example:
Where to find the serial number on a State Water Heaters
On a tank water heater, the rating label is on the side of the tank, usually near the gas valve or the upper electrical cover. Look for "SERIAL NO." or "S/N".
Tip: in a dark basement or closet, take a photo of the label with your phone's flash on and zoom in on the photo.
How to read a State Water Heaters serial number
Year + week (modern)
Used 2004–today
Digits 1-2 are the year and digits 3-4 are the week of the year (01-52).
Example: 1745108924 → November 2017 (week 45)
Month letter + year (before 2004)
Used 1970–2004 · varies between models, confirm with the label date
The first letter is the month (A = January ... H = August, J = September ... M = December; I is skipped). The next 2 digits are the year. F98 = June 1998.
Example: F98-123456 → June 1998
Common replacement parts for State Water Heaters
Always match the part to the model number on your rating label, and have gas or refrigerant work done by a licensed technician.
- State 100108683 Hot Surface Gas Water Heater IgniterCheck price on Amazon
- State 9000092015 Upper Water Heater ThermostatCheck price on Amazon
Cheap ways to avoid water damage
Water leak alarm
Sits on the floor next to the tank and sounds a siren at the first drop of water.
See leak alarms on AmazonWater heater drain pan
Catches small leaks and can be piped to a drain, which buys you time before a tank fails.
See drain pans on Amazon
Common questions about State Water Heaters equipment
Where is the serial plate on a State Select water heater?
Affixed to the side of the cylindrical tank roughly halfway between the top water ports and the bottom drain valve.
Are State Water Heaters parts interchangeable with A.O. Smith?
Yes. State is an A.O. Smith company brand. Heating elements, thermostats, gas valves, and anode rods are 100% interchangeable.
How long does a State Water Heaters water heater last?
About 10 years on average. Units that get yearly maintenance often last longer; units in hard-water areas, coastal air or unconditioned spaces often fail sooner.
Is the serial number the same as the model number?
No. The model number describes the product line, size and options. The serial number identifies your exact unit and contains the manufacture date. Both are printed on the same rating label.
How accurate is this age estimate?
The date comes from the published serial number formats for each brand. It is the factory date, not the installation date, and some formats repeat every 10 or 20 years. If the label shows a printed MFG. DATE, that date wins.