Grundfos has announced its integrated variable speed drive E-Circulator line, available in two configurations. Series 1000 pumps are suitable for constant temperature, flow and pressure control. Series 2000 pumps add the capability of differential pressure with the use of a transducer to the pump suction and discharge flanges. This enables the choice of proportional differential pressure control with firmware that maps pump performance to maximize energy savings. A key single-source advantage is the unit's combination of pump, motor and variable speed drive, which also reduces the space required in the mechanical room or at remote zone locations. The single-piece unit also offers plug-n-play operation; with one electrical connection, the "E-Circ"