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The primary function of heat exchangers in oil-burning systems is to transfer heat from combustion gases to the circulating water or air. This process is crucial for enhancing the overall efficiency of the heating system. By capturing the heat that would otherwise be wasted in the exhaust, heat exchangers ensure that more energy is utilized in the heating process, leading to improved performance and reduced energy costs.

Effective heat exchange is central to the operation of various heating systems, as it maximizes heat recovery and minimizes energy loss. This not only contributes to better system efficiency but also plays a role in maintaining consistent and desired temperatures within the space being heated. Other options focus on aspects that are not the primary role of heat exchangers: temperature control, emission reduction, and oil flow regulation. While these factors are important for the overall performance and environmental impact of the heating system, they do not embody the central purpose of heat exchange itself.