Which type of furnace typically has a larger heat exchanger?

The condensing oil furnace typically has a larger heat exchanger because it is designed to maximize heat recovery from the combustion process. In condensing furnaces, the design allows for the flue gases to be cooled to a point where the water vapor condenses, releasing additional latent heat that can be utilized to heat the home. This greater heat exchange efficiency necessitates a larger heat exchanger to capture this extra heat effectively, which is a key characteristic that sets condensing units apart from conventional ones.

Additionally, the construction of condensing oil furnaces accommodates the need for a more extensive surface area for heat exchange, allowing them to extract more energy from the combustion gases. This ultimately leads to higher efficiency ratings compared to conventional or non-condensing models. Overall, this design contributes to improved energy efficiency and reduced emissions, aligning with green practices in the HVACR industry.