- Circulating pumps are centrifugal pumps designed to generate a forced circulation in a closed system. Examples are heating systems for hot water or high-temperature hot water at temperatures above 120 °C, heat transfer systems, forced circulation boilers and reactor circuits They are also used in open systems .
The design of a circulating pump is often determined by the frequently high temperature of the fluid handled and the relatively low head, which corresponds to the head loss in the circulation system. Different types of circulating
pumps are used in closed pump circuits: circulating pumps with or without a shaft seal, and special designs.