A hot water supply apparatus comprising: a hot water supply channel including a heating section configured to heat water and a tank configured to store the water heated by the heating section, wherein the tank includes a first storage portion corresponding to a high-temperature layer, a second storage portion corresponding to a low-temperature layer, and an intermediate storage portion corresponding to a medium-temperature layer, and the hot water supply channel includes: an inflow channel allowing a water source and the second storage portion to communicate with each other; an outflow channel communicating with the first storage portion; a first heating channel allowing the intermediate storage portion and an inlet side of the heating section to communicate with each other; and a first return channel allowing an outlet side of the heating section and the first storage portion to communicate with each other, characterized in that the hot water supply channel further includes: a bypass channel allowing the outlet side of the heating section and an outlet end of the outflow channel to communicate with each other; and a first adjusting mechanism configured to adjust at least flow rates in the outflow channel and the bypass channel, and the hot water supply channel is configured to execute a first hot water supply operation in a hot water storage state where the low-temperature layer, the medium-temperature layer, and the high-temperature layer are formed in the tank, the first hot water supply operation being an operation of heating water in the medium-temperature layer to a first temperature by the heating section and supplying the water heated to a hot water supply target. a hot water supply channel including a heating section configured to heat water and a tank configured to store the water heated by the heating section, wherein the tank includes a first storage portion corresponding to a high-temperature layer, a second storage portion corresponding to a low-temperature layer, and an intermediate storage portion corresponding to a medium-temperature layer, and the hot water supply channel includes: an inflow channel allowing a water source and the second storage portion to communicate with each other; an outflow channel communicating with the first storage portion; a first heating channel allowing the intermediate storage portion and an inlet side of the heating section to communicate with each other; and a first return channel allowing an outlet side of the heating section and the first storage portion to communicate with each other, characterized in that the hot water supply channel further includes: a bypass channel allowing the outlet side of the heating section and an outlet end of the outflow channel to communicate with each other; and a first adjusting mechanism configured to adjust at least flow rates in the outflow channel and the bypass channel, and the hot water supply channel is configured to execute a first hot water supply operation in a hot water storage state where the low-temperature layer, the medium-temperature layer, and the high-temperature layer are formed in the tank, the first hot water supply operation being an operation of heating water in the medium-temperature layer to a first temperature by the heating section and supplying the water heated to a hot water supply target. an inflow channel allowing a water source and the second storage portion to communicate with each other; an outflow channel communicating with the first storage portion; a first heating channel allowing the intermediate storage portion and an inlet side of the heating section to communicate with each other; and a first return channel allowing an outlet side of the heating section and the first storage portion to communicate with each other, characterized in that the hot water supply channel further includes: a bypass channel allowing the outlet side of the heating section and an outlet end of the outflow channel to communicate with each other; and a first adjusting mechanism configured to adjust at least flow rates in the outflow channel and the bypass channel, and the hot water supply channel is configured to execute a first hot water supply operation in a hot water storage state where the low-temperature layer, the medium-temperature layer, and the high-temperature layer are formed in the tank, the first hot water supply operation being an operation of heating water in the medium-temperature layer to a first temperature by the heating section and supplying the water heated to a hot water supply target. a bypass channel allowing the outlet side of the heating section and an outlet end of the outflow channel to communicate with each other; and a first adjusting mechanism configured to adjust at least flow rates in the outflow channel and the bypass channel, and the hot water supply channel is configured to execute a first hot water supply operation in a hot water storage state where the low-temperature layer, the medium-temperature layer, and the high-temperature layer are formed in the tank, the first hot water supply operation being an operation of heating water in the medium-temperature layer to a first temperature by the heating section and supplying the water heated to a hot water supply target.