What tank holds water for boilers?

The term "feed water" refers specifically to the water that is supplied to a boiler to produce steam. It is essential to maintain a proper treatment and temperature of this water to ensure the efficient operation of the boiler and to prevent issues such as scaling and corrosion. This water is typically processed and conditioned before being introduced into the boiler system, where it undergoes heating to produce steam.

In contrast, a "boiler tank" could be misconstrued and is not a recognized term for a specific function related to water supply in boiler operations. "Cooling tank" serves a different purpose associated with coolants in processes, while a "hot water tank" stores water that has been heated for various uses but does not specifically pertain to the feed water provided to a boiler system. Thus, "feed water" stands out as the most accurate descriptor for the water used in boiler operations.