JP2005121254A - Hot water storage type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type water heater for hot water supply and heating capable of being installed in a small occupation area when installed outdoor and capable of comfortably heating a large area in a building. <P>SOLUTION: A first hot water storage tank 1 for storing hot or cold water for hot water supply, a second hot water storage tank 2 for storing hot or cold water for heating the building, a heat pump unit 3 as a heating means for heating the cold or hot water in the first and the second hot water storage tanks are provided and the second hot water storage tank is provided under a floor of the building. The second and the first hot water tanks are connected so that the cold or hot water in them circulates and the heat pump unit heats the cold or hot water in the first hot water storage tank. The second hot water tank 2 is formed by an object in a long pipe shape and favorably provided under the floor of the building in an even manner. Favorably, a fan 11 for heat radiation is provided above the second hot water storage tank. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hot water storage type hot water supply apparatus having a hot water storage tank for storing water or hot water, and in particular, stores hot water heated by heating means such as a heat pump unit, and stores a large amount of hot water without increasing the outdoor installation space. The present invention relates to a hot water storage type hot water supply apparatus that can perform heating from under the floor together with hot water supply.

  A conventional hot water storage type hot water supply apparatus includes a hot water storage tank for storing hot water for hot water supply therein, a first circulation circuit for sending the lowest water in the hot water storage tank to the uppermost part of the hot water storage tank, and a first circulation circuit. A heat pump unit that heats the water flowing through this circuit to produce high-temperature hot water, and a second heat pump that is heated by the heat pump unit and stored in the uppermost part of the hot water storage tank and returns to the hot water storage tank. And a heat exchanging means provided in the second circulation circuit for exchanging heat between the hot water flowing through the circuit and the object to be heated and using the hot water flowing through the second circulation circuit as the low temperature hot water. When the hot water in the hot water storage tank is consumed outside the hot water storage tank, the hot water supply pipe for sending the hot water in the hot water storage tank to the outside of the hot water storage tank and when the hot water in the hot water storage tank is consumed outside the hot water storage tank through the hot water supply pipe Water at the bottom of the tank The second circulation circuit is configured to return the low-temperature hot water returning to the hot water storage tank between the hot hot water and the water in the hot water storage tank (for example, Patent Documents). 1).

This hot water storage type hot water supply device uses hot water stored in the tank as a heat source for floor heating and the like as well as hot water supply. By returning to the position, or by providing two tanks for hot water supply and heating, a reduction in efficiency when the hot water in the tank is heated by the heat pump unit is prevented. In general, this type of hot water supply device uses electricity to heat the hot water in the hot water storage tank, so it is designed to control the heat pump unit only during the midnight hours when electricity charges are as low as possible. ing. In the hot water storage type hot water supply apparatus of Patent Document 1 described above, improvements have been made to store hot water only in the midnight hours, and perform hot water supply and heating the next day with the hot water stored in the tank.
Japanese Patent Laying-Open No. 2003-114053 (Claims, FIG. 1)

  By the way, since the hot water storage type hot water supply apparatus of the said structure uses the hot water in a hot water storage tank for heat sources, such as hot water supply and floor heating, it is necessary to enlarge the capacity | capacitance of a hot water storage tank compared with the conventional hot water supply apparatus which performs only hot water supply. However, since the hot water storage tank is installed outdoors in the residential premises, there is a problem that if the capacity of the hot water storage tank increases, it becomes impossible to install a hot water supply device in a small residential house. Further, in order to realize economical operation, if the hot water stored in the midnight hours is used to cover the next day's load, there is a problem that only a part of the house can be heated with a general tank size.

  The present invention has been made in view of such problems, and the object of the present invention is to provide outdoor hot water supply devices that use hot water in hot water storage tanks for hot water supply and heating applications. It is an object of the present invention to provide a hot water storage type hot water supply apparatus that can reduce the occupation range of the installed hot water supply apparatus and can heat a large area of a house, so that a comfortable heating can be performed for a resident. Another object of the present invention is to provide a hot water storage type hot water supply apparatus that can be operated at low cost because hot water stored with midnight power can be used for hot water supply and heating.

  In order to achieve the above object, a hot water storage type hot water supply apparatus according to the present invention includes a first hot water storage tank for storing hot water or hot water, a second hot water storage tank for storing water or hot water for heating a building, 1 hot water storage tank and heating means for heating water or hot water in the second hot water storage tank, and the second hot water storage tank is arranged under the floor of the building. As the heating means, a heat pump unit that heats by circulating water as a heat medium is preferable. In addition, it is preferable that the other components excluding the second hot water storage tank 2 are unitized as the outdoor unit 10.

  The hot water storage type hot water supply apparatus of the present invention configured as described above heats the water or hot water in the first hot water storage tank by heating means such as a heat pump unit to form hot water, and at the same time the water in the second hot water storage tank. Alternatively, the hot water is heated to a high temperature hot water, the hot water in the first hot water storage tank is used when hot water is used, and the hot water in the first hot water storage tank and the second hot water storage tank are used when heating is used. Circulate hot water and heat from under the building floor. In this way, hot water for hot water supply and hot water for heating are separated and stored, and the hot water for heating is placed under the floor of the building, so that the amount of hot water in the hot water storage tank installed outdoors can be reduced. The hot water storage tank can be downsized and the occupation range can be reduced.

  As a preferred specific embodiment of the hot water storage type hot water supply apparatus according to the present invention, the second hot water storage tank and the first hot water storage tank are connected so that the water or hot water in the inside circulates, and the heating means is the first one. Heating water or hot water in one hot water storage tank is characterized. That is, the first hot water storage tank and the second hot water storage tank are connected in parallel so that the internal water or hot water circulates, and the water or hot water in both hot water storage tanks is heated by one heating means. It has become.

  If comprised in this way, the structure becomes simple because the water or hot water in both tanks can be circulated and heated by one heating means, and the circulation from the first hot water storage tank to the second hot water storage tank is stopped in summer. Since heating is stopped and water or hot water in the first hot water storage tank is merely heated, unnecessary heating can be prevented and energy cost can be reduced.

  Further, as another preferred specific embodiment of the hot water storage type hot water supply apparatus according to the present invention, the second hot water storage tank is formed by a long pipe-like object, for example, a thick pipe or the like, and is evenly placed under the floor of the building. It is characterized by being arranged in. For example, it is preferable to pipe the entire surface under the floor at equal intervals. According to this configuration, the second hot water storage tank arranged under the floor of the building is formed of a pipe-like material, and the pipe-like material can be arranged on a large area of the floor surface by, for example, being drawn on the foundation slab. The required amount of hot water can be secured, and the entire area of the building can be heated uniformly.

  Furthermore, another preferred embodiment of the hot water storage type hot water supply apparatus according to the present invention is characterized in that a heat radiating fan is provided in the upper part of the second hot water storage tank. With this configuration, the amount of heat released from the second hot water storage tank to the underfloor space can be adjusted by operating the fan during heating in the building, and the temperature change inside the building can be adjusted by adjusting the heating capacity. It can be a comfortable heating facility with little.

  According to the present invention, it is possible to reduce the occupying range in which hot water storage tanks for hot water supply and heating are installed, and to easily install hot water storage type hot water supply devices for hot water supply and heating even when the site area is not sufficient. Can do. Moreover, since the 2nd hot water storage tank for heating can be arrange | positioned under a floor, the heating of a large area in a building can be performed efficiently. Furthermore, since the installation area is small and a large amount of hot water can be secured with a small occupation range within the site, midnight power can be used effectively, and the energy cost for storing hot water can be reduced.

Hereinafter, an embodiment of a hot water storage type hot water supply apparatus according to the present invention will be described in detail with reference to the drawings. FIG.
These are the whole block diagrams which show the hot water storage type hot-water supply apparatus which concerns on this embodiment, FIG. 2: is a principal part perspective view which shows the state which installed the apparatus of FIG. 1 in the building. 1 and 2, a hot water storage type hot water supply apparatus of the present embodiment includes a first hot water storage tank 1 for storing hot water or hot water, a second hot water storage tank 2 for storing water or hot water for building heating, A heat pump unit 3 is provided as a heating means for heating water or hot water in the first hot water storage tank 1 and the second hot water storage tank 2, and the second hot water storage tank 2 is disposed under the floor of the building. The heat pump unit 3 circulates low-temperature water in the lower part of the hot water storage tank 1 to exchange heat, and heats the water to return it to the upper part of the hot water storage tank 1 as hot water.

  The second hot water storage tank 2 is connected in parallel with the first hot water storage tank 1 so that the internal water or hot water circulates, and the heat pump unit 3 heats the water or hot water in the first hot water storage tank 1. It is configured. Therefore, the water or hot water in both the hot water storage tanks 1 and 2 can be heated by one heat pump unit 3 by circulating the water or hot water in the two hot water storage tanks 1 and 2.

  The first hot water storage tank 1 is provided with inlets and outlets for three paths through which water and hot water enter and exit. The first path P1 is a path for sending low-temperature water from the lower part of the hot water storage tank 1 to the heat pump unit 3 and returning the hot water heated by the heat pump unit 3 to the upper part of the hot water storage tank 1. Circulates to store a predetermined high temperature hot water in the hot water storage tank 1.

  The second path P2 is a hot water supply path. The pipe 2a for sending the hot water at the upper part of the hot water storage tank 1 to the hot water supply load 5 and the same amount of city water as the hot water sent to the hot water supply load 5 are the city water source 6. A pipe 2b flowing into the lower part of the hot water storage tank 1 and a pipe 2c serving as a bypass passage connecting the pipe 2a and the pipe 2b are provided, and a mixing valve 7 is disposed at the inlet to the pipe 2a. By this mixing valve 7, when the temperature of the hot water supplied from the hot water storage tank 1 to the hot water supply load 5 is high, the city water can be mixed to adjust the hot water temperature. The mixing valve 7 is controlled by a hot water supply controller (not shown) or the like, and is configured to supply hot water having a predetermined hot water temperature to the hot water supply load 5.

  The third path P3 is a path for heating, and is a path for circulating the hot water at the upper part of the hot water storage tank 1 to the second hot water storage tank 2 disposed under the floor of the building by the circulation pump 8. The circulation pump 8 is controlled by a heating controller (not shown) constituted by a microcomputer or the like, and controls the temperature and amount of hot water flowing through the hot water storage tank 2. Although not shown, it is preferable that the three paths include a backflow prevention valve, a pressure adjustment valve, and the like.

  The first hot water storage tank 1 is provided with a heat insulating material (not shown) on the outer periphery, and is configured to be difficult to cool even when high-temperature hot water is left for a long time. It has an internal capacity of about 300 liters. The hot water storage tank 1 has a structure in which hot water is stratified and stored, and hot water is stored in the upper part of the hot water tank so that the temperature decreases as it goes to the lower part. The pump 4 is controlled so that hot water having a predetermined temperature is always stored by circulating water or hot water. The hot water storage temperature is preferably about 90 ° C. when a large amount of hot water is used in winter, but may be lowered at other times.

  The second hot water storage tank 2 is evenly arranged on the entire floor under the floor of the building and is used for heating the building, and is formed of a long pipe-like object. That is, the hot water storage tank 2 has a pipe having a diameter of about 50 mm arranged in a straight line according to the width of the building, and when it approaches the outer wall, it is swung by a U-turn and returned in the opposite direction, and parallel with a pitch of about 30-50 cm. It is reciprocating to the state. In consideration of heat dissipation and durability, the pipe is preferably a metal pipe such as a copper pipe or a stainless pipe, but may be a resin pipe such as vinyl chloride.

  When the hot water storage tank 2 is installed in a house having a floor area of about 100 square meters, for example, if the pipes are separated from the outer peripheral wall surface by about 50 cm and piped in parallel at a pitch of 50 cm, the total length is about 150 to 200 m. It becomes about 300-400 liters. In this way, the second hot water storage tanks 2 are evenly arranged so that there is no bias across the entire floor of the building, and hot water is circulated from the hot water storage tank 1 by the circulation pump 8 to uniformly heat the building from below. It is a form that can be done. When the water or hot water in the hot water storage tank 1 is heated in the first path P1, the circulation pump 8 is operated to simultaneously heat the water or hot water in the hot water storage tank 2 so that the water in both tanks 1 and 2 is heated. Heating is performed by the heat pump unit 3 so as to be about 90 ° C., and when the temperature reaches a predetermined temperature, the heat pump unit 3 and the circulation pumps 4 and 8 are stopped.

  In the hot water storage type hot water supply apparatus of the present embodiment described above, the other constituent parts excluding the second hot water storage tank 2 are unitized as an outdoor unit 10. That is, city water is introduced into the outdoor unit 10 from the city water source 6, hot water is supplied from the outdoor unit 10 to the bathroom, kitchen, and washroom as the hot water supply load 5, and hot water is supplied to the outdoor unit 10 and the hot water storage tank 2. It is configured to circulate. This hot water storage type hot water supply apparatus is installed in a building 20, and the building 20 is composed of a foundation 21 and a roof 22, and the outdoor unit 10 is installed outside the building 20 as shown in FIG. The hot water storage tank 2 is installed on the lower surface of the underfloor space in the foundation 21. The outdoor unit 10 installed inside the outdoor site is not particularly large because it incorporates the hot water storage tank 1 having a normal volume, and can be easily installed in the site.

  A heat insulating material (not shown) is arranged on the outer periphery of the foundation 21 of the building 20 to prevent heat radiated from the hot water storage tank 2 from escaping to the outside of the building and being lost. One or more fans 11 that adjust the heat exchange rate of the hot water storage tank 2 are provided in the underfloor space above the hot water storage tank 2. By operating the fan 11, heat dissipation from the hot water storage tank 2 can be promoted, and the heat can be transmitted to the space in the roof 22 of the building 20. As a result, the building 20 includes the hot water storage type hot water supply apparatus, and includes a hot water supply facility that supplies hot water to a kitchen or a washroom and a floor heating facility.

  In addition, the said building 20 provided with a hot water storage type hot water supply apparatus can stop a heating function by not operating the circulation pump 8 in the middle of piping of the path | route P3 at the time which does not require the heating of summer. With this configuration, it is not necessary to heat the water in the hot water storage tank 2 in summer, and the load on the heat pump unit 3 can be reduced. In this case, a valve such as an electromagnetic valve may be installed in a path P3 in the middle of piping to the hot water storage tank 2, and heating may be stopped by closing the valve.

  As an example in which the hot water storage tank 2 is placed under the floor, an example in which the hot water storage tank 2 is placed on the foundation slab surface has been shown, but the hot water storage tank 2 may be embedded in the foundation concrete under the floor. If comprised in this way, since the heat radiated from the piping of the hot water storage tank 2 will be dissipated through the basic concrete and transmitted to the space in the building, the inside of the building will be heated uniformly without depending on the piping pitch. can do. In addition, since concrete has a large heat capacity, the temperature distribution of heat radiation becomes uniform, and a more comfortable heating with a small temperature change is possible.

The operation of the hot water storage type hot water supply apparatus of the present embodiment configured as described above will be described below. First, with reference to FIG. 3, the operation | movement which heats water or hot water with the heat pump unit 3 through the path | route P1 is demonstrated. The low-temperature water (cold water) in the lower part of the hot water storage tank 1 is circulated to the heat pump unit 3 by the circulation pump 4, heated here and returned from the upper part of the hot water storage tank 1 into the tank. The hot water returned from the upper part of the tank has a specific gravity smaller than that of the water inside the tank, so that the two are not mixed, and a temperature stratification is formed in the hot water storage tank with the upper part being hot and the lower part being low. This heating operation is performed at night time, for example, from 11:00 pm to 7:00 am.

  In this way, hot water of a predetermined temperature is stored in the hot water storage tank 1, and this hot water is used for hot water supply and heating. With reference to FIG. 4, the operation when hot water in hot water storage tank 1 is used for hot water supply through path P2 will be described. When the faucet is opened with the hot water supply load 5, hot water is supplied from the upper part of the hot water storage tank 1, and hot water can be used. The temperature of the hot water to be used is mixed with city water by the mixing valve 7 to be an appropriate temperature. If the amount of hot water in the hot water storage tank 1 decreases due to the use of a large amount of hot water, low temperature city water (cold water) is supplied from the city water source 6 and the hot water temperature in the hot water storage tank 1 is lowered, so the heat pump unit 3 in the path P1 It may be heated to return to a predetermined hot water temperature. In this case, daytime power is used instead of midnight power.

  Next, the operation when hot water in the hot water storage tank 2 is used for heating through the path P3 will be described with reference to FIG. When heating is performed, the circulation controller 8 and the fan 11 are controlled by the heating controller to adjust the interior of the building to a predetermined room temperature. When the circulation pump 8 is actuated, the hot water at the top of the hot water tank 1 is sent to the hot water tank 2, and the hot water sent is radiated in the hot water tank 2 to return to the hot water tank 1 as low temperature hot water. It is. The fan 11 may not be operated, but the heating capacity can be increased by operating the fan 11 as necessary.

  The hot water gradually flows out and the low temperature hot water returns, so that the hot water in the hot water storage tank 1 increases. However, the hot water amount in the hot water storage tank 1 is set to the amount of hot water required for one day heating. There is no need to heat. When the maximum temperature of the hot water in the hot water storage tank 1 is lowered by using the heating, the low temperature hot water is circulated along the path P1 shown in FIG. You may control so that the hot water temperature in the tank 1 rises. Again, daytime power is used.

  Here, the heat dissipation process of the hot water storage tank 2 when heating the building will be described. In the present embodiment, the hot water storage tank 2 is set so as to reach the highest temperature at 5:00 in the morning using late-night power, and the hot water gradually dissipates heat to the underfloor space to become low temperature hot water. It is controlled so that it is filled with hot water again by 5:00. The lower part of the hot water storage tank 2 has a large heat capacity such as foundation concrete and soil, and the temperature change in the underfloor space is very small and stable, so the heating inside the building is also comfortable with little temperature change. It can be.

  In addition, the outer peripheral portion of the building foundation 21 is heat-insulated, and the heat radiated from the hot water storage tank 2 to the space under the floor is difficult to escape to the outside of the building, and most is radiated from the floor of the first floor portion of the building into the building. Therefore, the floor of the first floor of the building is always kept warm at about 20 ° C. In this heating method, there is almost no temperature difference between the living room and a non-residential room such as a corridor or a toilet, so a safe environment free from heat shock can be created for the elderly. Furthermore, since the underfloor space can be used as a heating space, it is possible to prevent moisture from accumulating under the floor, so that even if there is no underfloor ventilation hole, corrosion of wood can be prevented in the case of wooden buildings, and in the case of steel structures, Rust can be prevented and the durability of the building can be improved, and the structure of the foundation can be simplified.

  FIG. 6 shows the average temperature of the hot water storage tank 2 when high temperature hot water is circulated in the hot water storage tank 2 and the temperature of the underfloor space is constant at 30 ° C. FIG. 7 shows the hot water storage tank 2. The amount of heat released from the floor to the underfloor space. The control method A in FIGS. 6 and 7 shows a transition when the fan 11 installed in the underfloor space is not operated. In the control method A, the temperature drop is the fastest immediately after the end of hot water storage (5:00), and the heat release is the largest. As time passes, the amount of heat release decreases, and almost no heat is dissipated at night (around 20:00), and the temperature reaches about 30 ° C. from midnight to morning.

  On the other hand, in the control method B, the transition when the fan 11 installed under the floor is operated and the heat radiation speed is adjusted is shown. The fan 11 is activated in the morning (6:00-9:00) and night (17:00-22:00) when the building cools down, and heat exchange is promoted to increase the amount of heat radiation in the morning and night, and the outside temperature The amount of heat release is suppressed during the rising daytime. As in the control method B, the heat radiation from the hot water storage tank 2 to the underfloor space can be controlled by operating the fan 11. Control system A and control system B have the same total heat dissipation, but control system B, which operates the fan, can increase the heat dissipation in the morning and evening, thereby reducing temperature changes inside the building and providing more comfortable heating. Make it possible.

  Generally, hot water storage water heaters that use hot water in hot water storage tanks as a heat source for hot water supply and heating need to store hot water and hot water for hot water storage tanks in the hot water storage tank during the midnight hours when electricity charges are cheap. Compared with the hot water storage type hot water supply apparatus to be performed, the occupation range of the hot water supply apparatus installed outdoors is increased. However, the hot water storage type hot water supply apparatus of the present embodiment stores hot water for heating in a hot water storage tank arranged in the space under the floor of the building, so that the range occupied by the hot water supply apparatus installed outdoors only performs hot water supply. It can be equivalent to a hot water supply device, and a hot water supply device capable of both hot water supply and heating can be installed even when there is not enough room.

  In addition, the outer periphery of the underfloor space is insulated and the heat capacity of the hot water, floor concrete, and underfloor soil in the hot water storage tank is large, so the temperature change in the underfloor space is very small, and a stable amount of heat flows into the building. Heat is dissipated. Therefore, all the floors of the first floor of the building are always at a comfortable temperature, which is a comfortable heating system for residents. Even when the building is a two-story building, the heat of heating the first floor part rises and the second floor part can be evenly heated, so the second floor part can be comfortably heated. Furthermore, since the hot water tank is heated only at midnight, and the amount of heat released to the floor can be controlled by a fan, it is not necessary to heat it up in the daytime and economical operation is possible.

  It is preferable to install a plurality of fans for adjusting the heating temperature on the outer periphery of the underfloor space, for example, to make a swirl flow in the underfloor space, so that the inside of the building can be efficiently heated. Since the hot water storage type hot water supply apparatus of the present embodiment uses the underfloor space inside the foundation 21 as a heating space, an underfloor ventilation hole provided in the foundation 21 of a building 20 such as a general residence is not necessary. That is, even if there is no underfloor ventilation hole, moisture does not accumulate under the floor, so there is no need to ventilate.

  In the heating operation of FIG. 3 described above, the heating capacity is increased by operating the circulation pump 8 of the path P3 on the hot water storage tank 2 side in the winter cold season so as to store hot water in the hot water storage tank 2 as well. Can be made. In this case, it is preferable to detect the outdoor temperature with a heating controller and to control the circulation pump 8 during the heating operation when the outdoor temperature is extremely low. When the water in the hot water storage tank 2 is kept at a high temperature during the heating operation, heat is first dissipated from the hot water in the hot water storage tank 2 to raise the temperature of the underfloor space. In order to heat the upper roof part, even if the circulation pump 8 is not operated, it is heated by heat radiation. And you may control so that the circulation pump 8 may be operated when the hot water temperature in the hot water storage tank 2 becomes low.

  Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention described in the claims. Design changes can be made. For example, a hot water supply controller and a heating controller (not shown) preferably have setting means that can arbitrarily set the hot water supply temperature and the heating temperature, and have a display device that displays the set temperature. Although an example of a heat pump unit has been shown as the heating means, other heating means such as a boiler using fuel such as oil or gas may be used.

Moreover, in the said embodiment, although the example using only late-night electric power was shown in order to heat the water of the 1st hot water storage tank 1 and the 2nd hot water storage tank 2, heating use amount increases in midwinter etc., When the hot water temperature in the second hot water storage tank 2 for heating is lowered, the heat pump unit 3 can also be heated using the electric power in the daytime through the first path P1. In this case, it is preferable that the hot water temperature in the first and / or second hot water storage tanks is detected and heated by an instruction from a hot water controller, a heating controller, or the like.

BRIEF DESCRIPTION OF THE DRAWINGS The whole block diagram of one Embodiment of the hot water storage type hot-water supply apparatus which concerns on this invention. The principal part perspective view of the state which installed the hot water storage type hot-water supply apparatus of FIG. 1 in the building. Operation | movement explanatory drawing which shows the heating state of the hot water storage type hot-water supply apparatus of FIG. Operation | movement explanatory drawing which shows the hot-water supply state of the hot water storage type hot-water supply apparatus of FIGS. Operation | movement explanatory drawing which shows the heating state of the hot water storage type hot-water supply apparatus of FIGS. The graph which shows the average temperature of the hot water storage tank for heating by two control systems in the case of keeping the temperature of underfloor space at 30 degreeC. The graph which shows the heat dissipation from the hot water storage tank for heating by the two control systems shown in FIG. 6 to floor space.

Explanation of symbols

  1: first hot water storage tank (for hot water supply), 2: second hot water storage tank (for heating), 3: heat pump unit (heating means), 4: circulation pump (for hot water supply), 5: hot water supply load, 6: city Water source, 7: mixing valve, 8: circulation pump (for heating), 10: outdoor unit, 11: fan, 20: building, 21: foundation (underfloor space), P1: first route, P2: second route , P3: third route

Claims (4)

  A first hot water storage tank for storing hot water or hot water, a second hot water storage tank for storing building heating water or hot water, and the water or hot water in the first hot water storage tank and the second hot water storage tank. A hot water storage type hot water supply apparatus comprising: a heating means for heating, wherein the second hot water storage tank is disposed under the floor of the building.   The second hot water storage tank and the first hot water storage tank are connected so that water or hot water therein circulates, and the heating means heats the water or hot water in the first hot water storage tank. The hot water storage type hot water supply apparatus according to claim 1.   The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the second hot water storage tank is formed of a long pipe-like object and is arranged evenly under the floor of the building.   The hot water storage type hot water supply apparatus according to any one of claims 1 to 3, further comprising a heat dissipating fan at an upper portion of the second hot water storage tank.

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