A circulator pump, also known as a circulating pump or circulation pump, circulates gases, liquids, or slurries within a closed circuit. These pumps are commonly used in hydronic systems, especially in heating or cooling applications. Because a hydronic circulator pump operates in a closed system, its main challenge is overcoming friction within the piping system. Unlike other pumps, it doesn’t need to lift fluid to a higher point of potential energy.
In hydronic systems, circulating pumps and circulator pumps typically work as electrically powered centrifugal pumps. In residential settings, these pumps are often compact, sealed, and rated at a fraction of a horsepower. However, in commercial applications, circulating pumps can vary greatly in size and can reach higher horsepower. Additionally, the electric motor is usually mechanically coupled to the pump body in such setups.
