Find out how old it is
The manufacture date is encoded in the serial number on the rating label. Most brands use the first four characters for the year and month or week. Your plumber can read it in seconds.
Signs it's time
- Water leaking from the tank body (not a valve or fitting)
- Rust-colored hot water, but clear cold water
- Rumbling or popping that flushing doesn't fix
- Frequent repairs in the last couple of years
When repair still makes sense
Elements, thermostats, thermocouples, igniters, and relief valves are all replaceable. On a heater under about eight years old with a sound tank, repair is usually the better value.
Repair or replace: a simple rule
Replacing a thermostat, heating element, igniter or thermocouple on a heater in good condition is usually worth it. A leaking tank is not repairable, and a heater past about 10 years old with a costly failure is generally better replaced than fixed.
Check the date code on the label (often in the serial number) to find the age.
What replacement involves
The plumber drains and removes the old tank, sets the new one on a pan, reconnects water and gas or electric, installs a new temperature and pressure relief valve, and checks venting. Many North Carolina and South Carolina jurisdictions require a permit for water heater replacement.
When Should You Replace a Water Heater: when to call a pro
- You smell gas
- The relief valve is discharging
- Water is leaking from the tank body
When Should You Replace a Water Heater: common questions
How long does water heater replacement take?
A like-for-like tank replacement usually takes a few hours. Moving the location or converting to tankless takes longer.
Can I install a bigger water heater?
Usually, if there is space and the gas line, venting and electrical can support it. The plumber sizes it to your household's peak demand.
How long does a water heater last?
Tank water heaters are commonly expected to last about 8 to 12 years; tankless units often last longer with maintenance.
Should I replace my water heater before it fails?
If it's near or past 10 years old, replacing on your schedule avoids water damage and an emergency installation.
Are electric water heaters changing?
Under a 2024 Department of Energy rule, most electric storage water heaters over 35 gallons made from May 6, 2029 will need heat pump technology.
Every home differs; editorial standards.