It contains water. Water that is in the process of going from one temperature to another. The state of the water previously was not good enough for the task required. The final state of the water will reach will be perfect for the task. You just need to raise the heat over time. In the suitable container that process can take place to the benefit of those who need the hot water.
Some people like it hot. Some people need it hot. Where are the kettles who can take the heat to deliver the goods?
For His Name’s Sake
C. L. J. Dryden