Rinnai tankless water heaters absolutely require regular annual maintenance to ensure optimal energy efficiency, prevent premature mechanical failure, and preserve their expected twenty-year operating lifespan. The most critical annual maintenance task involves flushing the internal heat exchanger with a mild descaling solution, such as food-grade white vinegar, to dissolve hard water mineral deposits and calcium scale that accumulate during the heating process. Additionally, homeowners should periodically inspect and clean the cold water inlet mesh filter, verify proper venting clearance, and check electronic control boards.
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