Air-conditioning apparatus and air-conditioning system

An air-conditioning apparatus that includes an outdoor unit including a compressor configured to compress refrigerant, a relay unit connected to the outdoor unit, and an indoor unit connected to the relay unit, the compressor being driven to circulate the refrigerant between the outdoor unit, the relay unit, and the indoor unit, the air-conditioning apparatus comprising

• a supplementary heat source unit in parallel with the indoor unit and connected to the relay unit;
• and
• a controller,
• the outdoor unit including
• an outdoor heat exchanger configured to exchange heat between the refrigerant flowing through the outdoor heat exchanger and fluid, and
• a flow switching valve configured to switch between passages for the refrigerant,
• the supplementary heat source unit including a supplementary heat exchanger configured to exchange heat between the refrigerant flowing through the supplementary heat exchanger and water, and heat the refrigerant,
• the relay unit including multiple valves configured to switch between presence and absence of flow of the refrigerant in the relay unit, the indoor unit, and the supplementary heat source unit,
• the indoor unit including an indoor heat exchanger configured to exchange heat between the refrigerant flowing through the indoor heat exchanger and fluid,
• the controller being configured to control the flow switching valve and the multiple valves depending on an operation mode,
• the controller being configured to perform a heating operation by switching the flow switching valve to a state that causes a discharge side of the compressor to be connected to the relay unit and switching the multiple valves to a state that causes the refrigerant discharged from the compressor to flow through the indoor heat exchanger and causes the refrigerant having flowed through the indoor heat exchanger to be supplied to the outdoor heat exchanger via the supplementary heat exchanger.