Extracorporeal blood treatment apparatus, comprising: a blood treatment device comprising a blood chamber and a fluid chamber separated from one another by a semipermeable membrane; an extracorporeal blood circuit comprising a blood withdrawal line connected to an inlet port of the blood chamber and a blood return line connected to an outlet port of the blood chamber; a blood pump configured to be coupled to the blood withdrawal line; a closed fluid line connected to an inlet port of the fluid chamber and to an outlet port of the fluid chamber, wherein the closed fluid line together with the fluid chamber forms a recirculation loop; a dialysis line connected to the closed fluid line for supplying a fresh treatment fluid to the inlet port of the fluid chamber; an evacuation line departing from the closed fluid line; a warming device coupled or configured to be coupled to the closed fluid line; a recirculation pump coupled or configured to be coupled to the closed fluid line; at least one temperature sensor operative on the extracorporeal blood circuit and configured to sense a blood temperature (Tb); a control unit connected to the warming device, to the recirculation pump and to said at least one temperature sensor; wherein the control unit is configured to execute the following procedure: ▪ receiving from the temperature sensor at least a signal correlated to the blood temperature (Tb); ▪ adjusting said blood temperature (Tb) by controlling at least one of the warming device and the recirculation pump, characterized in that the control unit is further configured to allow recirculation of fluid in the recirculation loop and selective fluid removal from the closed fluid line via the evacuation line during fluid recirculation in the recirculation loop. a blood treatment device comprising a blood chamber and a fluid chamber separated from one another by a semipermeable membrane; an extracorporeal blood circuit comprising a blood withdrawal line connected to an inlet port of the blood chamber and a blood return line connected to an outlet port of the blood chamber; a blood pump configured to be coupled to the blood withdrawal line; a closed fluid line connected to an inlet port of the fluid chamber and to an outlet port of the fluid chamber, wherein the closed fluid line together with the fluid chamber forms a recirculation loop; a dialysis line connected to the closed fluid line for supplying a fresh treatment fluid to the inlet port of the fluid chamber; an evacuation line departing from the closed fluid line; a warming device coupled or configured to be coupled to the closed fluid line; a recirculation pump coupled or configured to be coupled to the closed fluid line; at least one temperature sensor operative on the extracorporeal blood circuit and configured to sense a blood temperature (Tb); a control unit connected to the warming device, to the recirculation pump and to said at least one temperature sensor; wherein the control unit is configured to execute the following procedure: ▪ receiving from the temperature sensor at least a signal correlated to the blood temperature (Tb); ▪ adjusting said blood temperature (Tb) by controlling at least one of the warming device and the recirculation pump, ▪ receiving from the temperature sensor at least a signal correlated to the blood temperature (Tb); ▪ adjusting said blood temperature (Tb) by controlling at least one of the warming device and the recirculation pump, characterized in that the control unit is further configured to allow recirculation of fluid in the recirculation loop and selective fluid removal from the closed fluid line via the evacuation line during fluid recirculation in the recirculation loop.