A heating and hot water supply system including: a refrigerant circuit formed by annularly connecting a compressor, a usage-side heat exchanger, an expansion device and a heat source-side heat exchanger to one another, and refrigerant circulating through the refrigerant circuit; a heat medium circuit connected to a load-side heat exchanger, heat medium heated by the refrigerant in the usage-side heat exchanger being conveyed to the load-side heat exchanger by a circulation device, and the heat medium after it radiates heat in the load-side heat exchanger returning to the usage-side heat exchanger; a hot water-storing section provided in the heat medium circuit in parallel to the usage-side heat exchanger; a control device, and a temperature sensor for detecting temperature of the heat medium flowing out from the usage-side heat exchanger, wherein the heating and hot water supply system is configured to carry out a heating operation in which the heat medium heated by the refrigerant in the usage-side heat exchanger radiates heat in the load-side heat exchanger, and a hot water-storing operation in which hot water is stored in the hot water-storing section by the heat medium heated by the refrigerant in the usage-side heat exchanger, the heating and hot water supply system includes a distributer which is provided on a connecting portion between the heat medium circuit and the hot water-storing section, wherein the heating and hot water supply system is configured that the heat medium flows out from the usage-side heat exchanger, that the distributer adjusts a distribution ratio of a flow rate of the heat medium flowing toward the hot water-storing section and a flow rate of the heat medium flowing toward the load-side heat exchanger, and that the control device sets the distribution ratio of the distributer (60 based on the temperature detected by the temperature sensor, and the heating and hot water supply system includes an operation mode for carrying out the hot water-storing operation when the heating operation is carried out. a refrigerant circuit formed by annularly connecting a compressor, a usage-side heat exchanger, an expansion device and a heat source-side heat exchanger to one another, and refrigerant circulating through the refrigerant circuit; a heat medium circuit connected to a load-side heat exchanger, heat medium heated by the refrigerant in the usage-side heat exchanger being conveyed to the load-side heat exchanger by a circulation device, and the heat medium after it radiates heat in the load-side heat exchanger returning to the usage-side heat exchanger; a hot water-storing section provided in the heat medium circuit in parallel to the usage-side heat exchanger; a control device, and a temperature sensor for detecting temperature of the heat medium flowing out from the usage-side heat exchanger, wherein the heating and hot water supply system is configured to carry out a heating operation in which the heat medium heated by the refrigerant in the usage-side heat exchanger radiates heat in the load-side heat exchanger, and a hot water-storing operation in which hot water is stored in the hot water-storing section by the heat medium heated by the refrigerant in the usage-side heat exchanger, the heating and hot water supply system includes a distributer which is provided on a connecting portion between the heat medium circuit and the hot water-storing section, wherein the heating and hot water supply system is configured that the heat medium flows out from the usage-side heat exchanger, that the distributer adjusts a distribution ratio of a flow rate of the heat medium flowing toward the hot water-storing section and a flow rate of the heat medium flowing toward the load-side heat exchanger, and that the control device sets the distribution ratio of the distributer (60 based on the temperature detected by the temperature sensor, and the heating and hot water supply system includes an operation mode for carrying out the hot water-storing operation when the heating operation is carried out.