What is a common cause of hot spots on an electric heater strip?

A common cause of hot spots on an electric heater strip is insufficient airflow over the heater strip. When electric heaters operate, they rely on proper airflow to effectively distribute heat. If airflow is restricted—due to obstructions, dirty filters, or improper installation—the heat generated by the electric strip cannot dissipate adequately. This can lead to localized overheating or hot spots where the heat is concentrated rather than evenly distributed throughout the area. Maintaining adequate airflow is essential for the efficient and safe operation of electric heater strips, as it not only helps in achieving the desired temperature but also prevents potential damage to the heating elements.

In contrast, excessive voltage can cause the heater to operate outside its designed parameters, but it is not as directly related to the formation of hot spots as airflow is. Overheating, while it can result from multiple factors including poor airflow, is a consequence rather than a primary cause. Faulty electrical connections may lead to intermittent heating or malfunction but do not specifically lead to the localized heat concentrations that create hot spots. Thus, ensuring proper airflow is critical for the effective operation of electric heater strips and the prevention of hot spots.