Pronunciation: [pˈa͡ɪlət lˈa͡ɪt] (IPA) 
The spelling of the word "pilot light" is straightforward as it is pronounced exactly how it is spelled. The word "pilot" is pronounced as /ˈpaɪlət/ and refers to a person who operates an aircraft. Similarly, the word "light" is pronounced as /laɪt/ and refers to a source of illumination. Together, "pilot light" is pronounced as /ˈpaɪlət laɪt/ and refers to a small flame that is used to ignite the gas in a furnace or boiler.
A pilot light is a small, continuous flame that is used in various heating systems and appliances as a means of igniting the main burner when needed. It is typically found in older models of gas-powered devices, such as furnaces, water heaters, ovens, and stoves. The purpose of the pilot light is to ensure that a source of ignition is readily available whenever heat is required, thus facilitating the efficient and timely functioning of such equipment.
The pilot light is usually a small, blue flame that is constantly burning, acting as a standing pilot to initiate combustion. It is ignited via a spark or a separate gas valve, and once the flame is established, it remains lit until manually extinguished or in case of a malfunction. The primary role of the pilot light is to ignite the main burner or heating element in response to a thermostat's signals or user intervention.
While the pilot light itself does not generate a significant amount of heat, it provides an essential function in starting the combustion process. Its continuous presence ensures that the appliance can quickly respond to the demand for heat without requiring further manual intervention. However, due to advancements in technology, many modern appliances now generally employ electronic ignition systems instead of pilot lights, as they are more energy-efficient and reliable.
The word "pilot light" combines the noun "pilot" with the noun "light". Here is the etymology of both words:
1. Pilot: The word "pilot" originated from the French word "pilote", which traces back to the Italian word "pilota". In early usage, "pilot" referred to a person who steered a ship through dangerous or difficult waters. The word was first recorded in English around the 16th century, and it evolved to encompass various other meanings, including someone who guides or leads others, or who operates or navigates an aircraft.
2. Light: The term "light" finds its roots in the Old English word "lēoht", which further derives from the Proto-Germanic word "*leuhtam". It referred to brightness emitted by sources such as the sun or fire.
