A Takagi tankless water heater typically has an expected operational lifespan ranging between fifteen and twenty years when the unit is properly sized, professionally installed, and maintained with regular annual descaling flushes. Because tankless systems heat water strictly on demand rather than storing it under constant pressure, they avoid the interior corrosion cycles that plague traditional storage tanks. Maximizing this longevity requires protecting the heat exchanger from hard water mineral scale and ensuring proper combustion airflow throughout its service life.
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