Abstract: A device which suspends a horizontal heat-exchanger tube from a vertical supporting tube, including a flat section member adapted to be welded to an outside wall of the vertical supporting tube and parallel to an axis thereof, the flat section member being provided with a rounded notch which receives a support piece adapted to accommodate the horizontal tube, wherein the tube-receiving support piece is a folded metal sheet that is folded to match a shape of the notch and adapted to surround a portion of an outside periphery of the tube, the support piece having a top end and a bottom end, each of the ends being folded over towards the flat section member so as to be welded thereto, and wherein a collar adapted to enclose the horizontal tube is fixed against the tube-receiving support piece.