An extracorporeal blood treatment apparatus (1), comprising: a support part (101) configured to receive an extracorporeal blood circuit (100) having a treatment unit (2), a blood collection line (6) connected to a blood inlet of the treatment unit (2), and a blood return path (7) connected to an outlet of the treatment unit； a blood pump that, when the extracorporeal blood circuit (100) is received by the supporting part, is configured to control the flow of blood (QSANGRE) that flows through at least one of said blood collection route (6) and blood return route (7)； a control unit (10) connectable to a blood heating device (200) having heating components, the control unit (10) being configured to perform the following control procedure: - establish communication with said blood heating device ( 200), - identify, among a plurality of operating modes of the apparatus, a current operating mode that the apparatus is executing, - generate a control signal for the blood heating device (200), the control signal comprising at least one , optionally both, of the following: - an order to impose on the blood heating device (200) an operating mode that depends on the currently identified operating mode of said apparatus； - information defining said identified current operating mode； wherein said apparatus (1) comprises at least one treatment fluid pathway directly or indirectly connectable to said extracorporeal blood circuit (100), characterized in that the control procedure comprises calculating a maximum threshold of electrical energy (Pmax) authorized to be supplied to the heating components of the blood heating apparatus (200), wherein the maximum threshold (Pmax) is calculated at least based on measured or established fluid flow rates in said at least one treatment fluid path； wherein the step of generating a control signal in said control procedure comprises the following: if the identified current operating mode is a mode in which there is presence of blood flow in the
