Heat pump hot water system

The utility model relates to a heat pump hot water system, relates to the technical field of heat pump equipment, and is used for solving the problem that a refrigerant in the heat pump hot water system restricts the performance of the heat pump hot water system. Comprising a heat exchange device containing water to be subjected to heat exchange; the high-temperature refrigerant system is partially arranged in the heat exchange device, and a high-temperature refrigerant is arranged in the high-temperature refrigerant system; and the low-temperature refrigerant system is partially arranged in the heat exchange device, a low-temperature refrigerant is arranged in the low-temperature refrigerant system, and the system can start at least one of the high-temperature refrigerant system and the low-temperature refrigerant system according to the set target water temperature and the current environment temperature. The heat pump hot water system integrates two sets of refrigerant systems, under the condition of high