The average cost to have a professional plumber flush and service a tankless water heater should typically range between one hundred fifty and three hundred dollars, depending on regional labor markets and the complexity of the existing isolation valve configuration. This routine maintenance involves connecting a submersible pump and circulating food-grade white vinegar through the heat exchanger for approximately 45 to 60 minutes to dissolve mineral scaling. Paying significantly more than this range without major plumbing modifications warrants getting alternative contractor bids.
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