What is the function of a feedwater heater in a boiler system?

The feedwater heater plays a vital role in improving the efficiency of a boiler system. Its primary function is to preheat the feedwater that is entering the boiler. By raising the temperature of the feedwater before it enters the boiler, less energy is required to bring the water to the temperature needed for steam generation. This preheating process helps to reduce fuel consumption and improve overall thermal efficiency, as the boiler operates more effectively when incoming water is already warm. Additionally, preheating helps to minimize thermal shock to the boiler components and promotes a more stable operation within the system.

This clarification underscores the importance of utilizing a feedwater heater as part of an energy-efficient boiler operation, making option B the correct answer.