The voltage of a hot surface igniter can be which of the following?

The correct answer is that the voltage of a hot surface igniter can be 120 volts and 24 volts because these are the most common voltages used in residential and commercial heating systems. Hot surface igniters work by reaching a high temperature to ignite the gas in a furnace or boiler.

At 24 volts, hot surface igniters are often found in low-voltage systems, providing a safer option in residential settings. The 120-volt variety is more commonly used in direct ignition systems, particularly in older or larger heating appliances, where higher energy is required to ensure reliable ignition.

While other voltage levels mentioned can exist in different systems or contexts, they are not standard for hot surface igniters. For instance, 240 and 480 volts are usually associated with industrial equipment rather than heating applications, making them unsuitable for typical residential heating systems.