Which type of gas is most commonly used in residential heating?

Natural gas is the most commonly used type of gas in residential heating primarily due to its abundance, cost-effectiveness, and efficiency. It is delivered through a network of pipelines, making it widely accessible in urban and many rural areas. The combustion of natural gas produces a high amount of heat with relatively low emissions compared to other fossil fuels.

Additionally, natural gas appliances, such as furnaces and water heaters, are designed for optimal performance with this specific gas, ensuring safety and efficiency in heating applications. Other options like propane and butane are used in some areas, particularly where natural gas isn't available, but they generally come with higher costs and transportation considerations, making them less common for residential heating. Coal gas is an outdated source that is rarely used in modern residential settings.