▎ 摘　　要

NOVELTY - The device has a shell (1) provided with a water inlet (2) and a cold water outlet (4). An inner side of the shell comprises a graphene hot water pipe (5) and a cold water pipe (6). Two ends of the hot water pipe are matched with the water inlet and a hot water outlet (3), respectively. Two ends of the cold water pipe are matched with the water inlet and the cold water outlet, respectively. A temperature controller (7) is electrically connected to an electrode set on a graphene heating slurry (51) and an external power supply. The hot water pipe is formed as a snake-shaped curve structure. USE - Water heating device. ADVANTAGE - The device is energy-saving, inexpensive and convenient to use and maintain, and has high conductivity, quick heating performance, high heat efficiency and wide range of applications, and can quickly obtain hot water. DESCRIPTION OF DRAWING(S) - The drawing shows a front view of a water heating device. Shell (1) Water inlet (2) Hot water outlet (3) Cold water outlet (4) Graphene hot water pipe (5) Cold water pipe (6) Temperature controller (7) Graphene heating slurry (51)