Tankless water heaters can encounter several standard operational issues over their lifespan, primarily related to hard water mineral scaling and airflow restrictions. The most frequent problem is calcium buildup inside the heat exchanger, which restricts water flow, reduces efficiency, and triggers error codes if annual descaling is neglected. Other common issues include flame-sensing rod failures, igniter degradation, blocked intake or exhaust venting, and error codes triggered by low incoming gas pressure or clogged water inlet filters. Routine preventative maintenance and annual flushing easily prevent most typical operational glitches.
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