How Long Should a Water Heater Really Last?
Homeowners often assume their water heater will “just keep working” until it fails. In reality, the question isn’t only how long a unit can last—it’s how long it typically does in the real world, and what warning signs mean you should prepare sooner.
On average, conventional tank-style water heaters tend to last about 8 to 12 years. With proper maintenance and favorable conditions, some can run longer; heavy use, poor water quality, and lack of service can shorten that timeline.
Typical lifespans by water-heater type
Tank water heaters use a steel tank that accumulates mineral scale and corrosion over time. That deterioration is a major reason lifespan is finite. As a result, many manufacturers and industry guidance place expected service life in the same broad range.
General benchmarks:
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