Heat pump and gas heating water heater composite system

The invention discloses a heat pump and gas heating water heater compound system which solves the problem of defects caused when an existing heat pump and an existing gas heating water heater are independently used. The heat pump and fuel gas heating water heater composite system comprises a heat pump, a fuel gas heating water heater and a temperature controller, the heat pump and the fuel gas heating water heater are connected with a cooling and heating device of a user through a main pipeline, a first control program is arranged in the temperature controller and used for controlling a switch of the cooling and heating device, and the first control program is used for controlling the switch of the cooling and heating device in different working modes. The heat pump supplies cold water to the cooling and heating device, or the heat pump and/or the gas heating water heater supplies hot water to the cooling and heating device, and meanwhile the gas heating water heater supplies domestic hot water to a user. The