While Bosch tankless water heaters are engineered for high reliability, they can encounter standard operational challenges over their lifespan, primarily relating to water quality and airflow. The most frequent problem is mineral scale and calcium buildup inside the internal copper heat exchanger coils, which restricts water flow, reduces heating efficiency, and triggers error codes if annual flushes are neglected. Other common issues include flame-sensing rod degradation, igniter wear, blocked intake or exhaust venting, and error codes caused by low incoming gas pressure or clogged inlet water mesh filters.
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