Hydronic Circulating Pump, Hot Water Circulating Pump, HP 1/6 hp, Voltage - Pumps 120V AC, Phase - Pumps 1, Connection Style Flange, Inlet/Outlet Size 1-1/2 in, Shut-Off 33 ft, Housing Material - Pumps Cast Iron, Max. GPM @ Head 40 gpm @ 1 ft, Series E.2, Face to Face Dimension 8 1/2 in, Best Efficiency GPM @ Head 20 gpm @ 22 ft, Min. GPM @ Head 0 gpm @ 35 ft, Drive Type Direct, Height 8 1/2 in, Length 7 1/2 in, Width 4 13/64 in, Loop Configuration Closed, Flange/Union Included No