Kentucky Boiler Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The secondary role of the economizer in a boiler system is to assist with fuel savings. Economizers are designed to recover waste heat from the flue gas exiting the boiler and use that heat to preheat the feedwater entering the boiler. By raising the temperature of the feedwater before it enters the boiler, less fuel is needed to achieve the desired steam or hot water temperature. This not only improves the overall efficiency of the boiler system but also reduces fuel consumption, leading to significant cost savings in fuel expenses.

While other options mention important functionalities in a boiler system, they do not align with the primary and secondary roles of an economizer. For example, regulating water levels is a function typically managed by different components such as water level controls and feedwater systems, and purging unwanted gases usually falls to different equipment designed for emissions control rather than the economizer's heat recovery process. Monitoring exhaust temperatures is crucial for safety and operational efficiency but also involves separate instrumentation rather than being a function of the economizer itself. Therefore, the economizer fundamentally contributes to fuel savings as a key aspect of its role in enhancing boiler efficiency.