A circulator pump circulates gases, liquids, or slurries in a closed circuit. They are commonly found circulating water in a hydronic heating or cooling system. DK Hardware offers a variety of circulator pumps to provide you with the perfect solutions. The Armstrong Circulator Pump offers a maintenance-free design that uses permanently lubricated ball bearings. It is easy to repair and rebuild. The Honeywell Safety Hydronic Circulating Pump is designed for applications in closed-loop hydronic heating and cooling systems and solar systems. The pump is non-submersible and for dry, frost-free, well-ventilated installations. Taco Baron Circulator Pump are designed to efficiently circulate heated or chilled water in residential or light commercial Hydronic Systems. These In-Line Circulators may also be used for zoning large installations and are available in bronze or stainless steel construction for domestic hot water applications.