What is the most common voltage for a hot surface igniter designed for direct ignition?

The most common voltage for a hot surface igniter designed for direct ignition is 120 volts. In gas furnaces, hot surface igniters play a critical role in lighting the burner by reaching a high temperature when electrical current passes through them. This heat is sufficient to ignite the gas when it flows into the combustion chamber.

Using 120 volts for hot surface igniters is standard in residential heating systems, as it aligns with the common household electrical supply in many regions. This voltage is sufficient to rapidly heat the igniter, ensuring a reliable ignition of the gas.

While other voltages are utilized in different applications or systems, the prevalence of 120 volts for residential gas furnaces makes it the most common choice for hot surface igniters specifically designed for direct ignition.