What is the primary function of a hot surface igniter?

The primary function of a hot surface igniter is to provide heat for ignition. This component is designed to reach high temperatures quickly, allowing it to ignite the gas or fuel present in gas appliances such as furnaces or fireplaces. When an electrical current passes through the hot surface igniter, it heats up, and once it reaches the required temperature, it glows red-hot. This intense heat is sufficient to ignite the gas, leading to the proper operation of the appliance.

In contrast to other functions listed, such as conducting electricity, creating a spark, or increasing airflow, the hot surface igniter specifically focuses on generating heat. This differentiates it from other ignition methods, such as spark igniters, which create a physical spark for ignition.