Series NRF-25 small, cast iron circulator pumps are used for hydronic heating and cooling in closed loop systems. NRF-25 pumps are permanently-lubricated with a 1/15 HP, 2950 RPM, 115v, single phase, 3-speed motor. Series NRF pumps are small in-line circulator pumps intended to pump water through closed loop systems for heating and cooling in residential and light commercial applications. It's maintenance-free system, with a self-cleaning particle shield, and DuraGlide bearing systems protects the shaft and bearings from system start-up debris. Series NRF pumps have a Red Fox motor, which features high-starting torque, and a stabilized, heat-resistant, non-metallic impeller with a closed design. Mounting hardware and flange gaskets are included. Connections (sweat or flange) are available separately.