Step 1: Find the data label
Every tank water heater has a manufacturer's sticker, usually on the upper half of the tank, facing out. In a garage or closet you may need a flashlight. You're looking for a line that says Serial No. and sometimes a separate Mfg. Date.
If there's a printed manufacture date, you're done. If not, move on to the serial number.
Step 2: Read the serial number
Most manufacturers code the build date into the start of the serial number, but every brand does it a little differently. A few common patterns:
- Rheem and Ruud: the first four digits are often the month and year. A serial starting 0519 would be May 2019.
- A.O. Smith and State: newer serials usually start with the year and week, so 1912 would be the 12th week of 2019.
- Whirlpool and other store brands: these are built by larger manufacturers, and the date code depends on who made that unit. Check the label for a printed date first.
Can't make sense of it? Send us a photo of the label and we'll tell you how old it is.
How long do water heaters last in Florida?
Most tank water heaters last about 8 to 12 years. Hard water, a heater that's never been flushed, and a missing expansion tank can all shorten that. Tankless water heaters often last 20 years with regular descaling.
Repair or replace?
If the heater is under about 8 years old and the problem is a part (an element, thermostat, gas valve or relief valve), repair usually makes sense. If the tank itself is leaking, it can't be repaired. And past 10 years, money spent on repairs is money you'll likely spend again soon. We'll give you the price of both options and let you decide.
Warning signs your water heater is near the end
- Water on the floor around the base
- Rusty hot water
- Rumbling or popping from the tank
- Hot water running out faster than it used to
If you're seeing any of these on an older tank, schedule a water heater diagnostic before it fails on its own schedule.
Need a plumber in Volusia County?
$99 diagnostic, waived with approved work. Firm price before we start.
Frequently Asked Questions
Is a 15-year-old water heater dangerous?
Not necessarily, but it's living on borrowed time. Older tanks are more likely to leak, and a relief valve that hasn't been tested in years may not work when it's needed. Have it checked and plan to replace it.
Does the warranty date tell me the age?
The warranty length (6, 9 or 12 years) is printed on many labels, but it doesn't tell you when the heater was made. You need the manufacture date or serial number.