The basics
Every water heater has a rating plate, a sticker on the side of the tank with the model, serial number and other details. Hidden in the serial number, in most cases, is the build date. Each brand uses its own format, but most put the year and month near the start.
- Some serials start with a letter for the month and two digits for the year
- Others start with four digits: two for the year, two for the week
- Some labels print the manufacture date plainly
Step by step
- Find the rating plate. Look on the side of the tank, usually at eye level. Use a flashlight.
- Note the brand and serial number. Write them down or take a photo.
- Check for a printed date. Many newer labels show it directly.
- Decode the serial if needed. The manufacturer's website or customer service can confirm the format.
- Look for rental stickers. A rental company label means the heater may not be yours to replace.
- Check condition. Rust at the base, damp floors or rumbling noises suggest the end is near.
Time to bring in the shop
Call us when the tank has passed twelve and you want a plan, when you see rust or moisture at the base, or when hot water is running short. We can assess condition and recommend repair or replacement. For gas units see gas replacement; for other options read tankless or tank.
Extending life
A yearly flush removes sediment, and checking the anode rod every few years can add life to a tank in hard water.
Asked at the shop counter
How long do water heaters last?
Expect roughly ten to fifteen good years from a tank, more with care and softer water.
Where is the date on my water heater?
On the rating plate, either printed or encoded in the serial number.
Should I replace an old heater before it fails?
Often, yes. Planned replacement avoids leaks and rushed decisions.
Questions about this job? Call (365) 413-9125 and talk to a plumber.