The average professional cost to service and flush a Navien tankless water heater typically ranges between one hundred fifty and three hundred fifty dollars, depending on regional plumbing labor rates and the complexity of the existing isolation valve configuration. This essential annual maintenance involves connecting a submersible pump and circulating food-grade white vinegar through the dual stainless-steel heat exchangers for approximately 45 to 60 minutes to dissolve hard water mineral and calcium scale deposits. Routine servicing preserves the unit's high efficiency and long-term lifespan.
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