While Rheem tankless water heaters are highly efficient and reliable, they can encounter a few recurring issues over time, particularly related to water quality and airflow. The most frequent problem is mineral scale buildup on the internal copper heat exchanger coils, which restricts water flow, triggers error codes, and reduces heating efficiency 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 gas pressure or blocked water inlet filters. Routine preventative maintenance and annual flushing easily prevent most of these typical operational glitches.
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