What type of heating system is characterized by gravity flow of warm air?

The type of heating system characterized by the gravity flow of warm air is the gravity flow warm air furnace. This system operates based on the principle of warm air rising and cooler air sinking, utilizing natural convection to distribute heat throughout a space.

In a gravity flow warm air furnace, warm air is generated and rises into ductwork or spaces, gravity then helps the cooler air return to the furnace to be reheated. This method does not rely on mechanical fans or blowers to push air; instead, it harnesses the natural movement of air due to temperature differences.

Understanding this helps in recognizing the efficiency and effectiveness of different heating systems. Systems like forced air furnaces, while also distributing air, depend on mechanical means for circulation, differing fundamentally from the gravity-based operation of a gravity flow warm air furnace. Other systems like pump circulating hot water boilers use liquid to transport heat rather than air, making them distinct heating methods as well.