A pumping device arranged in a compact assembly that can be installed quickly and easily. The pumping device comprises a centrifugal electric pump, a pressurized vessel, and a manifold, wherein the pump, the vessel, and the manifold are enclosed in a single box-like body. The pump has two intake connectors arranged along perpendicular directions, and the pressurized vessel, for a delivery liquid, is fixed to the pump with an axis of symmetry that is parallel to the axis of the pump. The manifold has a one-way valve and is configured to distribute the delivery liquid to the pressurized vessel and to one of two delivery connectors that are oriented along perpendicular directions and are to be connected selectively or simultaneously to a hydraulic system. The intake connectors and the delivery connectors being in a single portion of the pumping device.