Hot-water supply device

A hot-water supply device having plural action modes, comprising:

• a can body which is arranged between a water entry path and a hot-water discharge path;
• a heat exchanger which is equipped inside the can body and heats water;
• a circulation pump which is arranged in a circulation passage to send all or part of water flowing out from the hot-water discharge path of the heat exchanger to the water entry path of the heat exchanger and which is configured to send the water to the heat exchanger;
• a water amount sensor which measures an amount of water flowing into the heat exchanger;
• a temperature sensor which measures a temperature of the water flowing into the heat exchanger;
• a temperature sensor which measures a temperature of water flowing out from the heat exchanger;
• and
• a control device being configured to control an action of the hot-water supply device, wherein
• the plural action modes comprise a hot-water supply mode in which warm water is supplied to the outside of the hot-water supply device, and an instant hot-water circulation mode in which water is circulated inside the hot-water supply device, and
• the control device is configured to switch the instant hot-water circulation mode to the hot-water supply mode based on the fact that,
• in the instant hot-water circulation mode,
• the control device is configured such that it determines that the water flows out from the hot-water supply tap based on the fact that an amount of water measured after the hot-water supply device starts to run is greater than an amount of water measured when the hot-water supply device starts to run by a preset amount,
• water flows out from a hot-water supply tap,
• when the amount of water measured after the hot-water supply device starts to run is less than a basic flow amount which is determined by the amount of water measured at the start of a first operation of the water heater by the preset amount, relearn the basic flow amount according to the amount of water at that time.