Neglecting to flush your tankless water heater can lead to various issues. Over time, mineral deposits like calcium and magnesium can accumulate within the system, causing reduced efficiency and potential damage. Flushing helps remove these deposits, ensuring optimal performance. Without regular flushing, your water heater's lifespan may be shortened, and repairs or replacement may become necessary. Additionally, inadequate flushing can result in reduced water flow, inconsistent heating, and increased energy consumption. It is crucial to follow the manufacturer's instructions on when and how to flush your unit. By doing so, you can maintain the efficiency and longevity of your tankless water heater, saving on energy costs and avoiding potential problems down the line.