The Heater-Cooler Unit HCU 40 from MAQUET brings together the latest proven technology along with outstanding performance. For a hypo-/hyperthermia unit rapid and precise temperature controls are an essential requirement especially during extracorporeal circulation. So, the HCU 40 is designed with two independent water circuits, the first circuit is used to supply temperature controlled water to the oxygenator blood heat exchanger and to the warming/ cooling blankets. Whereas the second circuit is used to supply temperature controlled water to the cardioplegia heat exchanger. In the HCU 40, to enable quick temperature adjustments at the outlets, the water tank for the patient and cardioplegia circuits is divided into two parts. The Heater-Cooler Unit HCU 40 provides exceptional heating and cooling due to large capacity heaters, fast ice-building technique, highly effective cooling plates, a powerful compressor and an efficient and intelligent electronic management of the heating and cooling components.