▎ 摘　　要

NOVELTY - The heater has a shell and a heating pipe (2). The heating pipe is installed in the shell. Two ends of the heating pipe are formed with a water inlet (3) and a water outlet (4). The heating pipe is coaxially provided with a guide column (5) along its own axis direction. The inner side wall of the heating pipe is provided with a graphene layer (6). USE - High-efficiency water heater. ADVANTAGE - The heating effect of the heating pipe on the water flow is better under the condition of consuming the same electric energy, and the effect of improving the heating water flow of the instant electric water heater is improved. DESCRIPTION OF DRAWING(S) - The drawing shows a partially structural sectional view showing the internal structure of the heating tube of the high-efficiency heater. 2Heating pipe 3Water inlet 4Water outlet 5Guide column 7Mounting frame 12Sealing ring 14Limiting ring groove