The invention is a water diverter apparatus comprising—a housing (10) having an inlet section (12) and two outlet sections (14), with a separation angle of less than 180° between the outlet sections (14), and—a flow directing member that can be adjusted by rotation about a shaft (18) supported in the housing (10). The apparatus is characterised in that—the flow directing member is a closing member (16) arranged downstream of the shaft (18), the closing member (16) being connected with the shaft (18) via a spacer (17) and having a closing surface arranged transversely to a flow direction, the closing member (16) having a first position adapted to close one of the outlet sections (14), a second position adapted to close the other outlet section (14), and a third position between the first and the second positions, adapted to allow water to flow into both outlet sections (14). The invention is furthermore a method for operating a water diverter apparatus.