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