Heat pump water heater for water circulation working medium

The utility model relates to the field of heat pump water heaters of water circulation working media, in particular to a heat pump water heater for a water circulation working medium. The heat pump water heater for the water circulation working medium comprises a vertical water heater box, a heat collector, a heat preservation water tank, a first heat exchanger, a second heat exchanger and a heat pump. The heat collector is connected with the second heat exchanger and forms a circulation path. A heat pump evaporator is arranged in the second heat exchanger. A heat pump condenser is arranged in the first heat exchanger. The heat preservation water tank is communicated with the first heat exchanger and forms a circulation path. The water tank is installed in the middle of the water heater box. The heat pump is installed at the bottom of the water heater box. The first heat exchanger and the second heat exchanger are annularly arranged outside the heat preservation water tank and fixed to the water heater box. The first heat exchanger and the second heat exchanger are tube-in-tube heat exchangers. The heat pump evaporator is the shell side of the first heat exchanger. The heat collector is connected with the tube side of the first heat exchanger. The heat pump condenser is the shell side of the second heat exchanger, and the heat preservation water tank is connected with the tube side of the second heat exchanger.