Booster unit with multi-impeller pumps designed for use in residential building service and commercial building service. Euro pump with cast iron pump body. The units are composed of two pumps, two expansion tanks and an EBox panel with display (EBox Plus) that allows the pumps to be exchanged at each start and protects against dry running when combined with a float or a pressure switch. Air supply connection included. The units are supplied assembled, set up and tested directly in the factory and complete with installation and maintenance instructions and test report. The DConnect service makes remote control possible (DConnect Box supplied separately).