Grundfos ups15-42f circulator water pump 59896180, cast iron, 220v, 1/25 hp, 3 speeds grundfos series up circulators are engineered to meet the demands of residential hot water and heating systems applications. The ups 15-42 f works in a variety of closed loops applications variety of open and closed loop applications features: ups closed system 3-speed circulator pump automatic resetting thermal protection multiple accessories for a variety of applications whisper-quiet operation for sound sensitive installations pump connection: gf 15/26 flange