A cooling device comprises a buffer circuit comprising a cooling unit for cooling coolant and a reservoir for buffering cooled coolant and a primary cooling circuit for providing coolant to a first heat exchanger. The first heat exchanger is arranged for exchange of thermal energy between the coolant and beverage in a dispensing line. The primary cooling circuit and the buffer circuit are connected to enable exchange of coolant. The cooling device comprises a coolant distribution module arrange to control exchange of coolant between the primary cooling circuit and the buffer circuit. The coolant distribution module may control at least one of valves as passive components and pumps as active components, in at least one of the primary cooling circuit and the buffer circuit. The coolant distribution module may operate based on coolant temperature in the primary cooling circuit.