What is the purpose of using a pilot light in a gas appliance?

The purpose of using a pilot light in a gas appliance is to initiate the burning of gas. The pilot light serves as a small, continuously burning flame that ignites the main gas burner when the appliance needs to operate. When the thermostat calls for heat or when the appliance is turned on, the gas flow is directed to the burner where it meets the pilot light, causing combustion.

This mechanism is crucial for the safe and efficient operation of gas appliances, as it ensures that gas is ignited only when there is a demand for heat. In absence of a pilot light, unburned gas could accumulate, presenting a safety hazard. The pilot light effectively acts as an ignition source, allowing the controlled burning of gas to produce heat when needed.