▎ 摘　　要

NOVELTY - The tube has a U-shaped tube body whose outer wall is provided with multiple fins. Two ends of the U-shaped tube body are connected with a heat exchange device. A sealing device is fixed between the outer wall and an inner wall of the U-shaped tube body and formed with multiple spiral grooves. The fins are made of graphene material. The inner and outer walls of the U-shaped tube body are made of graphene material. The sealing device is provided with a fastening device. USE - Household boiler heat-collecting tube. ADVANTAGE - The tube is convenient to use, and effectively increases steam heat or smoke heat exchanging efficiency, coal saving efficiency, preheater heat exchanging effect, and effectively uses remaining heat for heating water in a water tank of a boiler. DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a household boiler heat-collecting tube.