An extracorporeal blood treatment apparatus, comprising: a holding portion configured for receiving an extracorporeal blood circuit having a treatment unit, a blood withdrawal line connected to a blood inlet of the treatment unit, and a blood return line connected to an outlet of the treatment unit; a blood pump which, when the extracorporeal blood circuit is received by the holding portion, is configured for controlling the flow of blood (Q BLOOD) flowing through at least one of said blood withdrawal line and blood return line; a control unit connectable with a blood warming device having heating components, the control unit being configured to execute the following control procedure: - establishing a communication with said blood warming device, - identifying, among a plurality of modes of operation of the apparatus, a current operational mode which the apparatus is performing, - generating a control signal for the blood warming device, the control signal comprising at least one, optionally both, of the following: - a command directed to impose to the blood warming device a mode of operation depending upon the identified current operational mode of said apparatus; - an information defining said identified current operational mode; wherein said apparatus comprises at least one treatment fluid line directly or indirectly connectable to said extracorporeal blood circuit characterised in that the control procedure comprises calculating an electric power maximum threshold (P max) allowed to be supplied to the heating components of the blood-warming apparatus, wherein the maximum threshold (P max) is calculated at least based on measured or set flow rates of fluid in said at least one treatment fluid line; wherein the step of generating a control signal in said control procedure comprises the following: if the identified current operational mode is a mode wherein there is presence of blood flow in the extracorporeal blood circuit, the control unit is configured to include in the control signal a further command which is directed to impose that electric power supplied to the heating components of the blood warming device be below said maximum threshold (P max). a holding portion configured for receiving an extracorporeal blood circuit having a treatment unit, a blood withdrawal line connected to a blood inlet of the treatment unit, and a blood return line connected to an outlet of the treatment unit; a blood pump which, when the extracorporeal blood circuit is received by the holding portion, is configured for controlling the flow of blood (Q BLOOD) flowing through at least one of said blood withdrawal line and blood return line; a control unit connectable with a blood warming device having heating components, the control unit being configured to execute the following control procedure: - establishing a communication with said blood warming device, - identifying, among a plurality of modes of operation of the apparatus, a current operational mode which the apparatus is performing, - generating a control signal for the blood warming device, the control signal comprising at least one, optionally both, of the following: - a command directed to impose to the blood warming device a mode of operation depending upon the identified current operational mode of said apparatus; - an information defining said identified current operational mode; - establishing a communication with said blood warming device, - identifying, among a plurality of modes of operation of the apparatus, a current operational mode which the apparatus is performing, - generating a control signal for the blood warming device, the control signal comprising at least one, optionally both, of the following: - a command directed to impose to the blood warming device a mode of operation depending upon the identified current operational mode of said apparatus; - an information defining said identified current operational mode; - a command directed to impose to the blood warming device a mode of operation depending upon the identified current operational mode of said apparatus; - an information defining said identified current operational mode; wherein said apparatus comprises at least one treatment fluid line directly or indirectly connectable to said extracorporeal blood circuit characterised in that the control procedure comprises calculating an electric power maximum threshold (P max) allowed to be supplied to the heating components of the blood-warming apparatus, wherein the maximum threshold (P max) is calculated at least based on measured or set flow rates of fluid in said at least one treatment fluid line; wherein the step of generating a control signal in said control procedure comprises the following: if the identified current operational mode is a mode wherein there is presence of blood flow in the extracorporeal blood circuit, the control unit is configured to include in the control signal a further command which is directed to impose that electric power supplied to the heating components of the blood warming device be below said maximum threshold (P max). if the identified current operational mode is a mode wherein there is presence of blood flow in the extracorporeal blood circuit, the control unit is configured to include in the control signal a further command which is directed to impose that electric power supplied to the heating components of the blood warming device be below said maximum threshold (P max).