The average life expectancy of a Navien 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 exceptional operational longevity significantly surpasses traditional storage tank water heaters because Navien units heat water strictly on demand, utilizing dual stainless-steel heat exchangers that resist mineral scaling and rust far better than standard copper or glass-lined steel tanks. Furthermore, modular internal components can be easily replaced as they age, extending the overall operating window.
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