Neglecting to flush a tankless water heater annually causes hard water minerals and calcium scale to build up rapidly inside the narrow channels of the copper heat exchanger. This severe scaling acts as an insulating barrier that forces the burners to work significantly harder and run at much higher internal temperatures to transfer heat, resulting in reduced hot water flow rates, frequent system error code lockouts, and permanent heat exchanger damage. Over time, unchecked scale buildup can cause metal fatigue, pinhole leaks, and catastrophic premature failure, forcing a costly complete replacement of the entire tankless unit long before its expected lifespan.
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