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If you own a tankless water heater, you should schedule an annual service call, which includes a tankless water heater flush and checkup. The flushing process is important but tedious, which is why you need a professional plumber to do it. Without an annual flush, you could void your water heater’s warranty and increase the chances of problems. Understanding more about this process and how it works will help you see how critical it is to your water heater’s operation and lifespan.