Abstract: A heat exchanger element includes a tubular body with a wall at least partly delimited by an inner surface and an outer surface. The wall has a twisted shape on a segment of the body. The inner surface has a groove with a shape corresponding to the wall. The groove extends helically over the segment. On the segment, the outer surface has a diameter between 18 and 30 millimeters, the groove has a pitch of less than 3.5 millimeters and a depth such that the ratio of the pitch at a real power between 1.5 and 2.5 to the depth is less than a threshold value close to 24. A heat exchanger, for example of condenser type, can include such an element.