You should thoroughly clean and flush a Navien tankless water heater at least once every year as part of mandatory preventative maintenance to preserve its efficiency and twenty-year lifespan. This annual service involves isolating the unit, connecting 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 scale. Additionally, homeowners should periodically inspect, remove, and rinse the cold water inlet mesh filter to ensure uninhibited water flow.
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