Hot water supply apparatus

A hot water supply apparatus, comprising:

• a heat pump device in which a compressor and a heat exchanger are connected;
• a heat medium circuit connected to the heat pump device via the heat exchanger;
• a tank configured to store water after the water exchanges heat with a heat medium of the heat medium circuit;
• two tank-temperature sensors attached at different heights to the tank, the two tank-temperature sensors each being configured to detect a temperature of water in the tank;
• and
• a controller configured to, by using a value detected by each of the two tank-temperature sensors, control a temperature of water in the tank,
• wherein the controller sets a target hot water supply temperature based on a stored-hot-water temperature and a within-tank temperature difference, the target hot water supply temperature being a target temperature at which water in the tank is to be supplied as hot water, the stored-hot-water temperature being a temperature of stored hot water represented by a value detected by one of the two tank-temperature sensors selected by a user, the within-tank temperature difference being a difference between temperatures within the tank individually detected by the two tank-temperature sensors.