What does an economizer improve in a boiler's performance?

An economizer is a key component in a boiler system that significantly enhances the overall efficiency of fuel consumption. It achieves this by recovering heat from the flue gases that would otherwise be lost to the atmosphere. By preheating the feedwater entering the boiler, the economizer allows the boiler to operate more efficiently, as less fuel is needed to bring the water up to the desired temperature for steam generation.

This increased efficiency means that more of the energy contained in the fuel is utilized for producing steam, rather than being wasted, thus lowering operational costs and reducing emissions. As a result, the overall performance of the boiler improves, which is crucial for industries relying on steam for their processes. Enhancing fuel efficiency is particularly important in optimizing operational costs and minimizing environmental impact.

The other options presented do not accurately represent the primary role of an economizer. While it may affect water usage, steam pressure, and reliance on external energy to some extent, the core function and benefit of employing an economizer is its ability to boost fuel efficiency in boiler operations.