Which scenarios could lead to reduced heating efficiency in duct heaters?

Reduced heating efficiency in duct heaters can often be attributed to airflow issues, making the presence of obstructions in airflow a significant factor. When airflow is obstructed, hot air struggles to circulate effectively through the ducts. This means that heat generated by the duct heaters may not be evenly distributed throughout the space, leading to uneven heating and a decrease in overall system efficiency.

In addition to the reduced effectiveness of heat transfer due to limited airflow, obstructions can cause the unit to work harder to maintain the desired temperature, potentially leading to increased energy consumption and wear on the heating system. Ensuring a clear and unrestricted path for airflow is vital in maintaining optimal heating performance in duct heaters.

The other factors listed also contribute to efficiency concerns but are not as directly linked to airflow dynamics as obstructions are. For example, overload conditions and faulty wiring can lead to operational issues, while improper voltage supply may result in the unit not performing at its intended capacity, but these scenarios do not directly pertain to the immediate impact of airflow on heat distribution.