Use serial number to find age of your water heater
The year of manufacture of your water heater is encoded in the serial number on the data sticker. It is usually the first two numbers or second two numbers in the series, but varies by company and some use a single letter to indicate the year. Click on the brand of your water heater below to go to a page with instructions on how to interpret that specific manufacturer's serial number, along with examples. If you can’t find you water heater on the list or the serial number is not legible, keep reading further down for a solution.
A.O. Smith American American ProLine
Ariston Bosch Bradford White
Craftmaster Eccotemp EcoSmart
Eemax Envi-Ro-Temp GE GSW
Intertherm Jackson Jacuzzi
John Wood Kenmore Insinkerator
Marey Maytag Mor-Flo Navien
Noritz Paloma Premier Plus
Reliance Rheem Rheem tankless
Richmond Rinnai Ruud Seisco
SioGreen State Industries
Stiebel Eltron Takagi Tempra
Therm-a-flow Tiny Titan Titan
Thermalux Triangle Tube
US Craftmaster Westinghouse
Can’t find your water heater in the list?
There are less than a dozen major manufacturers of water heaters, but many sell under multiple brand names. More than a hundred names have been used and then abandoned over the years, and many of them are the same as the major retailers that sell them, such as Lowes or Ace. We can’t list them all here. But, if you look closely for the fine print on the data sticker, you are likely to find the actual manufacturer’s name to use to decode the serial number. Here’s an example below.
Can’t find the serial number?
Still stuck? Go to our blog post How can I determine the age of a water heater if the serial number is missing or decoding it is impossible?
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Here’s links to a collection of more blog posts about WATER HEATERS:
• What can I do to make my water heater last longer?
• Are water heaters required to be raised off the floor?
• What's that powdery crust on the pipe connections at the water heater?
• What are the most common installation mistakes with water heater replacement?
• What is backdrafting at a gas water heater?
• Where are gas water heaters not allowed to be installed?
• Is the minimum size water heater inlet pipe 1/2" or 3/4" according to the building code?
• Can you use a light switch for a water heater disconnect?
• How can I tell if a water heater is HUD-approved for mobile/manufactured homes?
• Can you wire a 240-volt water heater with 120 volts?
• Is it alright to have a shut-off valve on both the hot and cold water pipes at a water heater?
• Why is the water heater older than the house?
• Does a water heater need a shut-off valve?
• Why should a tankless water heater have an isolator/service valve kit installed?
• When was a gas water heater first required to be elevated 18 inches above a garage floor?
• Can the temperature and pressure relief (TPR) valve discharge pipe for a mobile/manufactured home water heater terminate under the home?
• What is the purpose of a thermostatic mixing valve above a water heater?
• Does a tankless gas water heater still work with no electricity during a power outage?
• Why do water heaters have a sacrificial anode?
• What is the difference between a manufactured/mobile home water heater and a regular water heater?
• Does a tankless water heater require a pressure relief valve?
• When is a water heater drain pan required?
• Why is there water in my water heater drain pan?
• What does it mean when a water heater Temperature/Pressure Relief (TPR) discharge pipe is "trapped"?
• Can I leave a gas water heater in place when remodeling a garage into a family room or bedroom?
• Where do I find the water heater in a mobile home?
• Does a tankless water heater in an attic require a drain pan?
• Does an electric water heater require a disconnect?
• Is a catch pan and drain piping required for a replacement water heater?
• What is the difference between a single element and dual element electric water heater?
• What is an FVIR water heater?
• What is a dielectric union?
• Why is my water heater making strange (rumbling, gurgling, knocking or banging) noises?
• How do I determine if a water heater is gas or electric?
• What does it mean when a gas appliance (water heater, furnace, or range) has been "red tagged"?
• What's the valve with the flip-up handle on the water heater for?
• Why is an older water heater an insurance problem?
Visit our WATER HEATERS page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.