What is the primary purpose of a boiler?

The primary purpose of a boiler is to generate steam or hot water, which serves crucial functions in both heating and industrial processes. Boilers operate by heating water to its boiling point, producing steam that can be used to drive turbines for power generation, heat buildings, or provide hot water for various applications. This steam or hot water is essential in a wide range of settings, from residential heating systems to large-scale industrial operations.

In contrast, the other options refer to processes or functions not typically associated with boilers. Cooling fluids is a function associated with chillers or cooling towers, energy storage pertains to systems designed to store energy, and converting electricity into steam is more involved in specific applications rather than the boiler's primary role. Hence, option A accurately reflects the fundamental function of a boiler in various sectors.