The present disclosure relates to a system for extracorporeal blood circulation, including an oxygenator which includes a heat exchanger configured for warming or cooling blood in extracorporeal blood circulation of a patient, and a heater/cooler configured for exchanging a quantity of heat with the heat exchanger, wherein the heater/cooler includes a thermoelectric heater/cooler and wherein the heater/cooler (14) is connected to the heat exchanger (11) by a thermal connecting element (15).
