Homeowners can successfully flush a tankless water heater themselves as a DIY project, provided they have basic mechanical skills, a submersible utility pump, standard garden hoses, and food-grade white vinegar. The process involves shutting off power and gas supplies to the unit, closing the water isolation valves, attaching hoses to the hot and cold service ports, and circulating vinegar through the heat exchanger for approximately 45 to 60 minutes to dissolve mineral scaling. However, if you are uncomfortable working with plumbing connections, electrical components, or gas lines, hiring a professional plumber to perform the annual service is recommended.
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