The utility model relates to a heat pump hot water system which combines the heating and heat storing functions. The utility model comprises a freezing medium loop and a water loop; wherein, the freezing medium loop and the water loop are connected by a water as well as fluorin heat interchanger, the freezing medium loop also comprises a compressor, a four joint valve, a throttling component, and an outdoor heat interchanger, each component is connected by pipelines and form the freezing medium loop, the water loop also comprises a pressure bearing water tank, a floor heating eradiating heat interchanger, a blower pipe coil heat interchanger, six electromagnetism valves, two water pumps and a water mixing machine, each component are connected by pipelines and form the water circulating loop. The utility model makes the heat pump hot water system can realize the functions of heating, storing heat, heating of the floor by controlling the opening and closing of each electromagnetism valves. The utility model is characterized in that: the utility model has economy and reliable capacities and the use is convenient.