You need to thoroughly flush and clean your Navien tankless water heater at least once every single year as part of mandatory preventative maintenance to preserve its high efficiency and twenty-year operational lifespan. This annual service requires isolating the unit, attaching a submersible pump, and circulating food-grade white vinegar through the dual stainless-steel heat exchangers for 45 to 60 minutes to dissolve hard water calcium and mineral scale. Furthermore, homeowners must periodically inspect and rinse the cold water inlet mesh filter to ensure uninhibited water flow.
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