The average life expectancy of a tankless hot water heater ranges between twenty and twenty-five years when the unit is properly sized, professionally installed, and maintained with regular annual flushing. This impressive longevity is nearly double the operational lifespan of traditional storage tank water heaters because tankless units heat water strictly on demand, eliminating the constant water pressure stress and severe interior tank corrosion that plagues standard glass-lined tanks. Furthermore, individual internal components—such as igniters, flow sensors, and computer control boards—can be easily replaced as they age, allowing the main heat exchanger to continue operating dependably for decades.
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