Which statement describes boiler blowdown?

Boiler blowdown is the process of removing a portion of water from the boiler to manage the concentration of dissolved solids and other impurities within the boiler water. This is essential for maintaining proper water quality, as high levels of contaminants can lead to problems such as scaling, foaming, and corrosion, which ultimately affect the efficiency and lifespan of the boiler. By controlling the concentration of total dissolved solids (TDS), blowdown helps ensure the safe and efficient operation of the boiler system.

The other options do not correctly describe the function of boiler blowdown. Discharged water from a cooling tower, water from floor drainage, and water used for heating purposes serve different purposes and do not pertain to the maintenance of water quality within a boiler system. Therefore, the statement that correctly encapsulates the role of blowdown is the one focused on removing water to control water quality.