Unit for distributing fluids (10, 10a, 10b), comprising a main housing which encloses within itself: - a supply pipe comprising an inflow piping segment arranged to be connected, at its inlet, to a pressurized sanitary water source and a first distribution piping segment intended to deliver cold sanitary water; - a sanitary heated water supply pipe comprising a second inflow piping segment arranged to be connected, at its inlet, with a source of heated sanitary water under pressure and a second distribution piping segment intended to deliver heated sanitary water; - a heating circuit comprising a delivery piping segment arranged for being hydraulically connected, at its inlet, to a pressurized heat carrier fluid source, and a return segment arranged for being hydraulically connected, at its outlet, to the heat carrier fluid source; - an inner housing made of thermally insulating material and enclosed within said main housing; said inner housing enclosing within itself said sanitary heated water supply pipe and said heating circuit, while leaving outside said first distribution segment and at least the portion of said inflow segment which is located upstream of said first distribution segment; characterized in that said unit (10, 10a, 10b) further comprises a recirculation circuit with a regulator valve connected, at its inlet, to the second inflow piping segment and, at its outlet, to the pressurized heat carrier fluid source, wherein said recirculation circuit is connected to the second inflow segment upstream of a meter or counter for fluids located in the sanitary heated water supply pipe, wherein said recirculation circuit comprises an outlet junction segment connected, at its inlet, with the regulator valve and connected, at its outlet, with a source of heated sanitary water under pressure, and wherein said unit further comprises a regulator element adapted to pilot the regulator valve and adapted to activate a recirculation pump by means of a control device. - a supply pipe comprising an inflow piping segment arranged to be connected, at its inlet, to a pressurized sanitary water source and a first distribution piping segment intended to deliver cold sanitary water; - a sanitary heated water supply pipe comprising a second inflow piping segment arranged to be connected, at its inlet, with a source of heated sanitary water under pressure and a second distribution piping segment intended to deliver heated sanitary water; - a heating circuit comprising a delivery piping segment arranged for being hydraulically connected, at its inlet, to a pressurized heat carrier fluid source, and a return segment arranged for being hydraulically connected, at its outlet, to the heat carrier fluid source; - an inner housing made of thermally insulating material and enclosed within said main housing; said inner housing enclosing within itself said sanitary heated water supply pipe and said heating circuit, while leaving outside said first distribution segment and at least the portion of said inflow segment which is located upstream of said first distribution segment; characterized in that said unit (10, 10a, 10b) further comprises a recirculation circuit with a regulator valve connected, at its inlet, to the second inflow piping segment and, at its outlet, to the pressurized heat carrier fluid source, wherein said recirculation circuit is connected to the second inflow segment upstream of a meter or counter for fluids located in the sanitary heated water supply pipe, wherein said recirculation circuit comprises an outlet junction segment connected, at its inlet, with the regulator valve and connected, at its outlet, with a source of heated sanitary water under pressure, and wherein said unit further comprises a regulator element adapted to pilot the regulator valve and adapted to activate a recirculation pump by means of a control device.