What is the primary function of the heat exchanger in a forced air oil-fired furnace?

The primary function of the heat exchanger in a forced air oil-fired furnace is to transfer heat from the flue gases to the circulating air. In the combustion process, the oil is burned in a combustion chamber, producing hot flue gases. The heat exchanger captures this heat and uses it to warm the air that is distributed throughout the living spaces via ductwork. This process is essential for efficient heating, as it maximizes the amount of heat that is transferred to the air while minimizing heat loss.

The design of the heat exchanger facilitates this transfer by providing a large surface area for the hot gases to pass over, thereby allowing the circulating air to absorb the heat as it flows past. This not only ensures that the furnace operates efficiently, but it also contributes to maintaining a comfortable temperature inside the home.