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The Grundfos Super Brute series are among the quietest, most reliable, and cost effective 3 speed-circulator pumps in the industry. The Super Brute series features multiple accessories for a variety of applications. Applications such as hydronic heating, fan coil heating, solar heating, and radiant heating systems. Nobody likes a noisy pump, but fortunately, the three speed motor technology reduces not only noise but power consumption as well. The Super Brute series features a unique removable integrated check valve that allows for minimal flow restriction and built in motor protection for a long service life. This series of circulator pumps has the highest performance and torque of any standard wet rotor circulator.  They are constructed of durable cast iron, bronze and stainless steel. Grundfos Super Brute Series Circulator Pump Model Comparison Chart Model Connection HP Voltage Phase GPM Max. Head 59896343 Flanged 1/2", 3/4", 1", 1-1/4" 1/25 115 1 17 19' 59896341 Flanged 1/2", 3/4", 1", 1-1/4" 1/25 115 1 17 19' 95906636 1-1/2" NPT 1/3 115 1 65 31' 95906637 1-1/2" NPT 1/3 230 1 65 31' 52722512 1/2" NPT 1/6 115 1 33 29' 52722513 GF 15/26 Flange 1/6 230 1 33 29' 59896772 GF 15/26 Flange 3/20 115 1 21 12' 59896778 1 1/4" NPSM 1/15 115 1 21 12' 59896773 GF 15/26 Flange 1/12 115 1 25 18' 52722514 1-1/2" NPT 1/6 115 1 63 14' 52722515 GF 40/43 Flange 1/6 230 1 63 14' 59896781 GF 15/26 Flange 1/12 115 1 25 18' 59896780 1 1/4" NPSM 1/8 115 1 21 12' 95906638 1-1/2" NPT 1/3 115 1 65 30' 95906639 GF 40/43 Flange 1/2 208/230 1 65 30' 95906630 1/2" flanged 1/2 115 1 53 45' 59896783 1-1/4" 1/15 115 1 25 18' 95906631 GF 15/26 flange 1/3 208/230 1 53 46' 98961765 Flanged 1/2", 3/4", 1", 1-1/4" 1/6 230 1 33 29' 52722520 1-1/2" NPT 1/6 115 1 63 14' 52722521 1-1/2" NPT 1/6 230 1 14 14' 95906632 GF 15/26 flange 1/3 115 1 53 46' 97523134 2" NPT 1/2 115 1 124 21' 97523135 GF 50 1/2 230 1 124 21' 95906633 GF 15/26 flange 1/3 208/230 1 53 46' 97523136 GF 50 Flange 1/2 115 1 124 21' 97523137 GF 50 Flange 1/2 230 1 124 145' CROSS REFERENCE PUMP CURVES CONSTRUCTION PUMP DIMENSIONS TEMPERATURE REQUIREMENTS Instructions Grundfos Super Brute Series Circulator Pumps Instructions Pump Overview Grundfos Super Brute Series Circulator Pumps Pump Overview Pump Products application engineers are standing by to help you find the right pump, as well as to provide price quotes, stocking availability and shipping information. Call our toll free number 1-800-429-0800 to speak to an expert today.