Which type of gas is commonly used for residential heating?

Residential heating commonly utilizes natural gas, propane, and butane, making the correct answer comprehensive.

Natural gas is widely used due to its availability in many areas and is supplied through pipelines, making it a popular choice for heating homes. It burns cleanly and offers an efficient form of energy for heating and cooking.

Propane is also extensively used, especially in rural areas where natural gas pipelines may not be accessible. It is stored in tanks and can be an effective fuel source for heating systems, water heaters, and appliances.

Butane, while less common than natural gas and propane, can also serve as a heating fuel. It is primarily used in portable heating applications and can be found in tanks for use in outdoor heating devices.

Since all three gases have applications in residential heating, stating "All of the above" accurately reflects the different options available for heating homes. This understanding is crucial for service technicians to effectively advise homeowners on their heating options based on availability and efficiency.