Solar water heater

The invention discloses a solar water heater which comprises a solar heat collector and a heat storage water tank. A condenser is arranged in the heat storage water tank and communicated with the solar heat collector through a pipe, a heat collecting panel is arranged on the solar heat collector, a plurality of backflow branch pipes are arranged on the heat collecting panel at intervals, the upper ends of the backflow branch pipes are communicated through an upper collecting pipe, the lower ends of the backflow branch pipes are communicated through a lower collecting pipe, an air inlet of the condenser is communicated with the upper collecting pipe through a connecting pipe, a backflow opening of the condenser is communicated with the lower collecting pipe through a backflow pipe, an air discharging and liquid charging valve is arranged on the connecting pipe, and a heat preservation layer is arranged on the outer wall of the heat storage water tank. According to the solar water heater, phase change heat tran