What are the three types of heating systems commonly used?

The three types of heating systems commonly used are indeed furnace, boiler, and geothermal systems.

A furnace is a common heating system that operates by converting various fuel types (such as natural gas, oil, or electricity) into heat, which is then distributed through ductwork or radiators. It is widely used in residential and commercial settings due to its efficiency and effectiveness in heating large spaces.

A boiler is distinct from a furnace as it heats water or steam, which is then distributed via pipes to radiators or through a radiant floor system. This method is particularly effective for providing consistent and even heating throughout a building.

Geothermal heating utilizes the earth's natural underground temperatures to transfer heat into a building. This system is considered highly efficient and environmentally friendly as it relies on renewable energy. It typically involves a system of buried pipes that transfer heat extracted from the earth.

In summarizing, the combination of furnace, boiler, and geothermal systems covers a wide range of heating methods used for residential and commercial applications, reflecting diverse energy sources and technology.