The Rinnai 104000248 Water Heater Combustion Fan Kit by HnKParts ensures efficient combustion and optimal performance of your Rinnai water heater. A disruption in the fan kit can lead to insufficient airflow, causing the water heater to underperform or shut down. This could result in inconsistent water heating, increased energy consumption, and potential safety hazards due to improper... https://www.hnkparts.com/104000248-rennai-kit-combustion-fan-kb