Oklahoma Service Technician Practice Exam

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What type of gas is most commonly used in gas furnaces?

Butane

Nitrogen

Natural gas or propane

Natural gas or propane is the most commonly used fuel in gas furnaces due to its efficiency and availability. Natural gas is primarily composed of methane and is sourced through pipelines, making it a convenient choice for many households. Propane, while less common than natural gas, is often used in areas where natural gas is not accessible. It is stored in tanks and can also be delivered to homes, providing a flexible heating option.

These two gases are favored because they burn cleanly and produce a significant amount of heat relative to the amount of fuel consumed. This efficiency not only helps in reducing energy costs but also minimizes the environmental impact compared to other fuels. In contrast, butane is less commonly used in residential heating systems, nitrogen is an inert gas not used as a fuel source, and carbon dioxide is a byproduct of combustion rather than a fuel.

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Carbon dioxide

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