2nd Class Power Engineering (2B2) Practice Exam 2026 – Complete Study Resource

The primary function of a feedwater heater in a boiler system is to preheat the water entering the boiler. By raising the temperature of the feedwater before it enters the boiler, the feedwater heater enhances the efficiency of the boiler operation. This preheating process reduces the amount of energy needed to convert the water into steam, as less energy is required to heat the water when it is already warm.

Additionally, this preheating helps to minimize thermal shock to the boiler components, ultimately prolonging the life of the equipment and reducing wear and tear. It can also improve the overall efficiency of the steam generation process, leading to lower fuel costs and improved system performance.

Therefore, the notion that the main function of a feedwater heater is to preheat the water entering the boiler is fundamental to understanding its role in maintaining an efficient and effective boiler system.