What common gas is typically used in combustion heaters?

Natural gas or propane is commonly used in combustion heaters due to their efficient energy properties and availability. These gases are hydrocarbon-based fuels that provide a high heat output when burned, making them ideal for heating applications such as residential furnaces and water heaters. Natural gas is prevalent in many areas as a utility supply, while propane is often used in areas where natural gas lines are not accessible.

The combustion process of these gases produces heat and can be controlled precisely, allowing for effective temperature regulation. Additionally, both natural gas and propane burn cleanly compared to other fuels, producing fewer emissions and reducing environmental impact when used in heating systems. This characteristic aligns with modern energy efficiency standards and environmental regulations, making them the preferred choice for combustion heaters.