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The Armstrong H series of in-line circulator pumps is suitable for domestic hot water systems. This series is built using a standard three-piece design that features a radially-split body, oversized shaft, centrifugal impeller, positive mechanical seal, and modular construction. The H series has been used by HVAC professionals for decades because it is cost-effective, durable, and easy to maintain. Features Standard three-piece design with sleeve - oil lubricated bearing Radially-split body can be left in-line while servicing pump, eliminating disconnecting of pipes Oversized shaft made from special alloy steel Balanced centrifugal impeller ensures maximum water delivery in the HVAC system Proven seal design made from strong and long-lasting materials for extended operating life Three piece modular construction and back pull-out design for easy replacement of wear components ARMSTRONG H SERIES CIRCULATOR PUMPS Model Comparison Chart Model Flange Size (NPT) HP Voltage Phase GPM Max. Head H-32 Flanges Sold Separately 1/6 115 1 36 12' H-32 Flanges Sold Separately 1/6 115 1 36 12' H-41 1" 1/6 115 1 21 17' H-51 1" 1/4 208-230/460 3 42 24' H-52 1-1/4" 1/3 208-230/460 3 52 26' H-51 1" 1/4 115 1 42 24' H-52 1-1/4" 1/3 115 1 52 26' H-32 Flanges Sold Separately 1/6 115 1 36 12' H-53 1-1/2" 1/2 208-230/460 3 80 28' H-41 1" 1/6 115 1 21 17' H-53 1-1/2" 1/2 115 1 80 28' H-54 2" 3/4 208-230/460 3 95 28' H-54 2" 3/4 208-230/460 1 95 28' H-41 1" 1/6 115 1 21 17' H-63 1-1/2" 1/2 208-230/460 3 34 33' H-63 1-1/2" 1/2 115 1 34 33' H-64 1-1/2" 3/4 208-230/460 3 55 45' H-64 1-1/2" 3/4 115 1 55 45' H-66 2" 3/4 208-230/460 3 102 30' H-65 1-1/2" 1 208-230/460 3 55 57' H-52 1-1/4" 1/3 208-230/460 3 52 26' H-53 1-1/2" 1/2 208-230/460 3 80 28' H-51 1" 1/4 115 1 42 24' H-51 1" 1/4 208-230/460 3 42 24' H-67 2" 1 208-230/460 3 132 36' H-65 1-1/2" 1 115 1 55 57' H-52 1-1/4" 1/3 115 1 52 26' H-66 2" 3/4 115 1 102 30' H-68 2" 1-1/2 208-230/460 3 142 46' H-67 2" 1 115 1 132 36' H-53 1-1/2" 1/2 115 1 80 28' H-54 2" 3/4 208-230/460 3 95 28' H-54 2" 3/4 115 1 95 28' H-63 1-1/2" 1/2 208-230/460 3 34 33' H-63 1-1/2" 1/2 115 1 34 33' H-64 1-1/2" 3/4 208-230/460 3 55 45' H-64 1-1/2" 3/4 115 1 55 45' H-65 1-1/2" 1 208-230/460 3 55 57' H-66 2" 3/4 115 1 102 30' H-65 1-1/2" 1 115 1 55 57' H-66 2" 3/4 208-230/460 3 102 30' H-67 2" 1 208-230/460 3 132 36' H-68 2" 1-1/2 208-230/460 3 142 46' H-67 2" 1 115 1 132 36' PERFORMANCE CURVES DIMENSIONS DESIGN INFORMATION MATERIALS OF CONSTRUCTION REPAIR PARTS BROCHURE Armstrong H Series Circulator Pump Brochure INSTALLATION MANUAL Armstrong H Series Circulator Pump Installation Manual REPAIR PARTS Armstrong H Series Circulator Pump Repair Parts 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.