The average professional cost to flush and service a tankless water heater typically ranges between one hundred fifty and three hundred dollars, depending on regional labor rates and the complexity of the existing isolation valve setup. 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 hard water mineral and calcium scale deposits. While homeowners can purchase a DIY descaling kit for under a hundred dollars, hiring a licensed plumber ensures the job is performed safely without damaging internal seals.
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