Hot-water storage type hot-water supply device and hot-water storage type heating and hot-water supply device

A hot-water storage hot-water supply device comprising:

• a heat pump unit for heating water;
• a hot-water storage tank for storing hot water heated by the heat pump unit;
• a hot-water supplying heat exchanger including a pipe which is placed in the hot-water storage tank so as to extend substantially entirely in a vertical direction thereof and which receives water from a lower side thereof and discharges hot water from an upper side thereof;
• a hot-water temperature sensor detecting a temperature of water heated by the heat pump unit;
• and
• a boil-up three-way valve an input side of which is connected to the heat pump unit, one output side of which is connected to a lower portion of the hot-water storage tank to flow water from the input side into the lower portion of the hot-water storage tank so as to be merged into water filled within the hot-water storage tank, and another output side of which is connected to an upper portion of the hot-water storage tank to flow water from the input side into the upper portion of the hot-water storage tank so as to be merged into water filled within the hot-water storage tank,
• wherein the boil-up three-way valve is configured to flow water from the input side to the another output side connected to the upper portion of the hot-water storage tank when the detected temperature of water heated by the heat pump unit is equal to or greater than a predetermined temperature, and to flow water from the input side to the one output side connected to the lower portion of the hot-water storage tank when the detected temperature of water heated by the heat pump unit is less than the predetermined temperature.