What is the main function of a hot surface igniter?

The main function of a hot surface igniter is to heat up and ignite gas. This component is typically made of a silicon carbide or similar material that can reach very high temperatures when electric current passes through it. The igniter glows a bright orange or white when heated, providing the necessary thermal energy to ignite the gas when it flows through the burner assembly.

When the gas is properly mixed with air, the heat from the igniter causes the gas to combust, thus starting the heating process in the system. This mechanism is crucial in ensuring that the heating system operates efficiently and safely. The importance of this function is underscored by how modern heating systems rely on hot surface ignition for fast and reliable start-up, enhancing overall performance and safety compared to older systems that used intermittent pilot lights or spark ignition methods.