A hot surface igniter requires how many volts to operate properly?

The correct answer is grounded in the operational requirements of a hot surface igniter. Hot surface igniters typically require a high voltage of around 115 to 125 VAC to function effectively. This voltage range is necessary to heat the igniter to a point where it can ignite the gas in a furnace or other heating appliances.

Hot surface igniters work by using electrical resistance to produce heat. When the appropriate voltage is applied, it generates sufficient heat to ignite the fuel. If the voltage is too low, the igniter won't reach the necessary temperature, leading to ignition failure.

In contrast, the other options represent voltages that are either too low or inappropriate for the operation of a hot surface igniter. For instance, the 24 to 30 mV values are far too low as igniters require a significantly higher voltage to function. Additionally, other low-voltage figures do not align with the operational standards for this type of component, confirming that 115 to 125 VAC is indeed the required voltage for proper operation.