Traditional residential storage tank water heaters should be proactively replaced every 8 to 12 years, even if they are still functioning, to minimize the risk of a catastrophic tank rupture and indoor flood. Modern tankless water heaters last longer, typically requiring replacement every 15 to 20 years. Routine annual maintenance—such as flushing mineral sediment and replacing sacrificial anode rods—can help your water heater reach or exceed its maximum expected lifespan. Verification: Check your water heater's serial number sticker to determine its exact age.
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