The average lifespan of a modern tankless water heater ranges between 15 to 20 years when properly maintained, significantly outlasting traditional storage tank water heaters which typically last 8 to 12 years. Achieving this maximum lifespan requires performing annual descaling flushes to remove hard water mineral scale, keeping the inlet filter clean, and protecting the unit from freezing temperatures during extreme winter conditions. Verification: Review your unit's installation date and maintenance logs to evaluate remaining service life.
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