An injection system for injecting one or more fluids into a patient, the injection system comprising one or more supply stations (105a;105b) each one for supplying one of the fluids to be injected from a container (110a;110b), wherein at least one of the supply stations (105a;105b) comprises: housing means (115a,120a;115b,120b) defining a closed chamber for housing the container (110a;110b), the chamber having a connection port (132a;132b) for connecting the container (110a;110b) to a delivery arrangement (135,145) for delivering the fluid to the patient, and a conditioning device (205a;205b) for thermally conditioning the fluid in the chamber, characterized in that the conditioning device (205a;205b) comprises a first conditioning element (210a;210b) arranged around the connection port (132a;132b) and a second conditioning element (215a;215b) extending transversally to the first conditioning element (210a;210b), said conditioning device (205a;205b) being positioned externally to said container (110a;110b) and internally to said closed chamber; the first conditioning element (210a;210b) extends horizontally in an operative condition of the injection system completely surrounding the connection port (132a;132b) in a plan view; the first conditioning element (210a;210b) comprises a first heating coil having a planar arrangement in a plane which is substantially perpendicular to a longitudinal axis of said container (110a;110b), said first heating coil having a first resistance; the second conditioning element (215a;215b) extends from a border of the first conditioning element (210a;210b) vertically in the operative condition of the injection system, and the second conditioning element (215a;215b) comprising a second heating coil having a second resistance higher than the first resistance of the first heating coil. housing means (115a,120a;115b,120b) defining a closed chamber for housing the container (110a;110b), the chamber having a connection port (132a;132b) for connecting the container (110a;110b) to a delivery arrangement (135,145) for delivering the fluid to the patient, and a conditioning device (205a;205b) for thermally conditioning the fluid in the chamber, characterized in that the conditioning device (205a;205b) comprises a first conditioning element (210a;210b) arranged around the connection port (132a;132b) and a second conditioning element (215a;215b) extending transversally to the first conditioning element (210a;210b), said conditioning device (205a;205b) being positioned externally to said container (110a;110b) and internally to said closed chamber; the first conditioning element (210a;210b) extends horizontally in an operative condition of the injection system completely surrounding the connection port (132a;132b) in a plan view; the first conditioning element (210a;210b) comprises a first heating coil having a planar arrangement in a plane which is substantially perpendicular to a longitudinal axis of said container (110a;110b), said first heating coil having a first resistance; the second conditioning element (215a;215b) extends from a border of the first conditioning element (210a;210b) vertically in the operative condition of the injection system, and the second conditioning element (215a;215b) comprising a second heating coil having a second resistance higher than the first resistance of the first heating coil.