Booster unit with one, two or three vertical multi-impeller pumps. It is designed for pressurization tasks, for the recirculation of water for heating in commercial building service and for irrigation also in agriculture. The two-pump version has an EBox Plus electrical panel, which makes remote control possible thanks to the DConnect service (DConnect Box supplied separately). The three-pump version is supplied with an electrical control panel. There is an expansion tank for each pump. The presence of the electrical panel allows the pumps to be switched on and off at each start, when combined with a float or pressure switch protects against dry running and allows the pumps to operate in cascade according to the set value.