Cold and hot drinking water dispenser with disinfecting circuit

A drinking water dispenser (1) comprising:

• an inlet pipeline (2) for connection to an external water source (25);
• an inlet solenoid valve (3) installed in the inlet pipeline (2);
• a cold water tank (6) equipped with a cooling device (9);
• a hot water tank (8) equipped with a heater (10) and installed below the cold water tank (6);
• a cold water outlet pipeline (11) connecting the cold water tank (6) to a cold water outlet (13);
• a hot water outlet pipeline (14) connecting the hot water tank (8) to a hot water outlet (16);
• a first pipeline (5) connecting the inlet pipeline (2) to the cold water tank (6);
• a circulation pump (24) ensuring circulation of hot water in a disinfection mode;
• a second pipeline (7) connecting the inlet pipeline (2) to the hot water tank (8);
• a circulation pipeline (19) connecting the hot water outlet pipeline (14) to the cold water outlet pipeline (11);
• and
• a check valve (20) installed in the circulation pipeline (19) allowing water to flow from the hot water outlet pipeline (14) to the cold water outlet pipeline (11) and not allowing water to flow in the opposite direction,
• wherein the first pipeline (5) is connected to the cold water tank (6) through a vertical pipe (26) with an open upper end (27) installed in the cold water tank (6), a lower end (28) of which is connected to the first pipeline (5).