▎ 摘　　要

NOVELTY - The utility model claims a solar water heater, relating to the field of solar utilization, comprising a shell; the inner part of the shell is provided with a liner; the outer wall of the liner is provided with a graphene or carbon crystal heating film; the bottom of the graphene or carbon crystal heating film is provided with a group of transmission line; and one end of the power transmission line is connected with a power generation plate; the bottom of the liner is provided with an electric heating rod. The outer wall of the inner container of the solar water heater of the utility model winding with graphene or carbon crystal heating film; the graphene or carbon crystal heating film is connected with the power generating plate through the transmission line, so as to form a single closed water tank photovoltaic heating system; the power generating plate converts the solar energy into electric energy; the electric energy makes the graphene or carbon crystal heating film to heat the water in the inner container; when the solar energy collecting effect of the electric heating plate is not good, the electric heating rod electrically heats the water in the inner container; the solar water heater can be used in rainy day; the photovoltaic power generation system and the electric heating system reduce the energy consumption of the water heater; It improves the using effect of the solar water heater.