How Long Do Gas Water Heaters Last


Keeping a tab on your water heater’s condition and age is important so you’ll have a good idea when to start looking for a replacement. With that, how long do gas water heaters last?

Tank-type water heaters can last for 8 to 12 years

According to, the anode rod which protects the interior lining of your tank is a good indicator of its efficiency. Once that rod has corroded and corrosive particles have settled on the bottom of your tank, you should start looking for a new one.

Tankless water heaters can last for 20 years or longer

This type of water heater doesn’t work continuously. Because of that, you can expect them to last longer than tank-style water heaters.

Check your water heater’s serial number

If you fail to keep track of the age of your appliance, just check its serial number. It has a letter and a series of numbers.

The letter typically stands for the month it was manufactured while the next two numbers refer to the year it’s made. For example, if your unit’s serial number is “F15”, it means that your water heater was made in February 2015.

If you can’t find your tank’s serial number, you can always get a confirmation from the manufacturer’s website. You can also check out this helpful video on where to locate water heater model numbers.