A make-up pump is a pump specifically designed to add or replenish condensate in a system where steam is condensed back into water. In industrial settings, particularly in power plants or heating systems, steam is used to transfer energy and then condensed back to water to be reused. The make-up pump ensures that the condensate level is maintained by adding water to compensate for any losses due to leakage or evaporation. This helps in maintaining the efficiency and proper functioning of the system by ensuring a consistent level of condensate.