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The Grundfos MAGNA3 series circulator pump is designed for circulating liquids in systems with variable flows where it is desirable to optimize the setting of the pump duty point, thus reducing energy costs. This pump is especially suitable for installation in existing systems where the differential pressure across the pump is too high in periods with reduced flow demand.  It is also suitable for new systems where automatic adjustment of pump head to actual flow demand is desired, without using expensive bypass valves or similar components. Furthermore, the pump is suitable for systems with hot water priority as an external signal can immediately force the pump to operate according to the maximum curve, for example in solar heating systems.  Simply install the pump and leave it on the factory setting, AUTOADAPT.  The pump will automatically analyze the heating system, find the optimum setting and then continuously adjust its operation to changes in demand saving time and effort. The MAGNA3 is the most efficient circulator available on the market today. With the lowest Energy Efficiency Index (EEI) in the world, below 0.20, you can achieve energy savings of up to 75% compared to a typical installed circulator. With the unique Autoadapt control these savings can be as much as 85% and thereby a remarkably fast return on investment. Features AUTOADAPT FLOWADAPT and FLOWLIMIT Intuitive user interface with TFT display Proportional pressure control Constant pressure control Constant temperature control Built-in Grundfos differential pressure and temperature sensor Constant curve duty Maximum or minimum curve duty Automatic night setback Internal motor protection. No external motor protection required Heat energy meter Work log history Insulating shells supplied with single-head pumps for heating systems Large temperature range where the liquid temperature and the ambient temperature are independent of each other 8-1/2"  port-to-port length Maintenance free Multi-pump function External control and monitoring enabled via add-on modules Applications Heating systems Air-conditioning and cooling systems Domestic hot water systems Ground source heat pump systems Solar heating systems GRUNDFOS MAGNA3 SERIES CIRCULATOR PUMPS Model Comparison Chart Model Flange Size HP Voltage Materials of Construction GPM Max. Head MAGNA3 40-80 F 1-1/2" 1/3 115 Cast Iron 81 27' MAGNA3 40-80 F 1-1/2" 1/3 208-230 Cast Iron 81 27' MAGNA3 40-80 F 1-1/2" 1/3 115 Stainless Steel 81 27' MAGNA3 40-80 F 1-1/2" 1/3 208-230 Stainless Steel 81 27' MAGNA3 40-180 F 1-1/2" 3/4 208-230 Cast Iron 48 58' MAGNA3 40-120 F 1-1/2" 1/2 208-230 Stainless Steel 98 37' MAGNA3 40-120 F 1-1/2" 1/2 115 Stainless Steel 98 37' MAGNA3 65-120 F 2-1/2" 1 115 Cast Iron 210 40' MAGNA3 65-150 F 2-1/2" 1-1/2 208-230 Cast Iron 250 50' MAGNA3 65-150 F 2-1/2" 1-1/2 208-230 Stainless Steel 250 50' PERFORMANCE CURVES PUMP IDENTIFICATION EXPLODED VIEW MATERIALS OF CONSTRUCTION TROUBLESHOOTING OWNERS MANUAL Grundfos Magna3 Series Circulator Pump Owner's Manual BROCHURE Grundfos Magna3 Series Circulator Pump Brochure INSTALLATION & INSTRUCTIONS Grundfos Magna3 Series Circulator Pump Installation & Instructions 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.