Pump High Efficiency 1"Pump High Efficiency 1" High efficiency variable speed circulator pump for boiler or heat pump systems, offering multiple control modes with low power consumption. Key Benefits Includes 1" NPT stainless steel flange union Multiple operating modes: auto, proportional pressure, constant pressure, constant speed, night setback ECM motor uses up to 85% less electricity LED display shows watts, flow, and RPM Quiet, compact design with plug and play
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