JP2004100997A - Hot-water supply heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot-water supply heating system capable of performing heating and/or drying of a bathroom and heating of a floor without using other heat source. <P>SOLUTION: In this hot-water supply heating system in which hot water is supplied into a bathtub 10 from an electric water heating device and which is provided with a heating circuit in which hot water heated in a heat exchanger 41 circulates by a circulation pump 46 between the heat exchanger 41 for heating provided in an upper part in a tank 1 of the electric water heating device and a heating machine 42 provided indoors, an expansion tank 45 is arranged in the heating circuit, a supply water pipe 49 is constituted to take in supply water into the expansion tank 45 by branching from a water supply or hot-water supply pipe of the electric water heating device, and an opening and closing valve 50 opening and closing automatically in accordance with water level in the expansion tank 45 is arranged in the supply water pipe 49. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hot water supply / heating system, and in particular, uses an electric water heater of a hot water supply device having a function of supplying hot water to a bathtub as a heat source, and heats and / or dries or heats a bathroom without using another heat source. The present invention relates to a hot water supply / room heating system capable of performing such heating.
[0002]
[Prior art]
Conventionally, in multi-family dwellings and general detached houses, hot water boilers and electric water heaters using late-night electricity have been widely used for hot water supply in bathtubs, and hot water of a predetermined temperature stored in a tank of the electric water heater is used. Is supplied from a hot water supply port or a faucet of a bathtub, and a reheating heat exchanger is provided in the tank in order to enable reheating if necessary.
[0003]
By the way, for example, when heating and / or drying a bathroom, a bathroom heater / dryer is generally installed in the bathroom separately from a heat source of a hot water supply device in the bathtub.
The bathroom heater / dryer is an electric heater system in which air heated by an electric heater built in the bathroom heater / dryer is blown into the bathroom by a blower, and an air heat exchanger built in the bathroom heater / dryer Hot water generated by a boiler using gas, petroleum or the like as a fuel, and a boiler hot water system in which air in a bathroom is heated by a heat exchanger is adopted.
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned conventional bathroom heater / dryer, although there is a heat source of the hot water supply device, separately from this, a new electricity or gas is required as a bathroom heating / drying heat source, and equipment costs and running costs increase. Had the problem that
In addition, in the boiler hot water system, the heating capacity can be increased, but the temperature rise characteristic immediately after the start of operation is poor, and it takes time to generate hot water to start the operation, and furthermore, the temperature control in the bathroom However, since the operation of the boiler is repeatedly started and stopped, there is a problem that the loss during the combustion is large.
Furthermore, in the electric heater system, the temperature rise characteristic is better than that of the boiler hot water system because of the heating operation by the electric heater, but since the heater capacity is limited, the heating capacity is limited and the capacity may be insufficient. In addition, there is a problem that the electricity cost is high and the running cost is higher than that of the boiler hot water system.
[0005]
A similar problem also occurs in a heater for performing floor heating or the like.
[0006]
The present invention, in view of the problems of the above-described conventional heaters such as a bathroom heater / dryer and a floor heater, performs heating and / or drying and / or floor heating without using other heat sources. It is an object of the present invention to provide a hot water supply / heating system that can perform the hot water supply / heating.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the hot water supply / room heating system of the present invention supplies hot water to a bathtub from an electric water heater, and is installed indoors with a heating heat exchanger installed at an upper part in a tank of the electric water heater. In a hot water supply / heating system provided with a heating circuit in which hot water heated in the heat exchanger is circulated by a circulation pump between heaters, an expansion tank is provided in the heating circuit, and the expansion is performed. The makeup water pipe is configured so that the makeup water to the tank is branched off from the water supply or hot water supply pipe of the electric water heater, and an on-off valve that automatically opens and closes according to the water level of the expansion tank is provided in the makeup water pipe. It is characterized by having done.
[0008]
In this hot water supply and heating system, a heating heat exchanger is installed in the tank of the electric water heater, and the hot water generated by the heating heat exchanger using the electric water heater as a heat source device is supplied to the heater installed in the room. Because the heating (and / or drying) is performed by the heat exchanger of the heater, a new heat source is not required for heating (and / or drying) the room, and equipment costs and running costs are reduced. Cost reduction can be achieved.
Also, at the start of operation, the heated hot water is already stagnant in the heat exchanger installed in the tank, so the heated hot water can be supplied to the heater installed indoors in a short time, and the temperature rises. It has excellent characteristics and does not require a combustor unlike the boiler hot water system.Therefore, there is no combustion loss due to repeated combustion operation and stoppage even when performing indoor temperature control, and the heating capacity Can be increased.
In addition, the expansion tank arranged in the heating circuit can absorb the expansion and contraction of the volume of the circulating water due to the temperature change, so that the amount of water in the heating circuit can be kept constant, and the heat exchange for heating can be performed. Hot water can be circulated stably between the vessel and the heater installed in the room.
Furthermore, a makeup water pipe is configured so as to branch and take in makeup water to the expansion tank from the water heater or hot water supply pipe of the electric water heater, and an opening / closing valve that automatically opens and closes the makeup water pipe according to the water level of the expansion tank. Since the circulating water is provided, the circulating water can be replenished even when the amount of circulating water is reduced, so that maintenance can be simplified.
[0009]
In this case, the heat exchanger for heating and the heat exchanger for reheating the hot water in the bathtub are formed in spirals having different winding diameters, respectively, and can be installed in parallel in the upper part in the tank of the electric water heater. .
[0010]
As a result, the upper space in the tank of the electric water heater can be used effectively, and the amount of hot water required for reheating the inside of the tank of the electric water heater with the upper heater can be reduced, thereby reducing energy costs. it can.
[0011]
Also, the winding diameter of the heating heat exchanger is formed smaller than the winding diameter of the heat exchanger for reheating the hot water in the bathtub, and the heat exchanger for reheating the hot water in the bathtub is formed around the outer periphery of the heating heat exchanger. Can be arranged.
[0012]
This makes it possible to easily balance the calorific value of the heat exchanger for reheating the hot water in the bathtub that requires a large amount of heat and the heating heat exchanger that requires only a relatively small amount of heat.
[0013]
Further, by performing heating by the heater before the end time of the midnight power time zone, heat can be stored.
[0014]
As a result, by using inexpensive late-night power, heat is stored in the electric water heater and, for example, the constituent material of the floor surface, and efficient heating can be realized.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a hot water supply / room heating system of the present invention will be described with reference to the drawings.
[0016]
1 and 2 show a first embodiment of a hot water supply / heating system of the present invention in which an electric water heater of a hot water supply device is used as a heat source for bathroom heating / drying.
Generally, as shown in FIG. 1, an electric water heater as a hot water supply device is provided at a cylindrical tank 1 having a required hot water storage capacity, and at an upper portion and a lower portion of the tank 1 to reduce water in the tank 1 to a set temperature. The upper heater 2 and the lower heater 3 for heating, and if necessary, the water supplied from the bathtub 10 and supplied from the bathtub 10 is heated by the warm water stored in the tank 1. And a heat exchanger 4 for reheating.
[0017]
Further, a water supply pipe 5 is provided at a bottom position of the tank 1 of the electric water heater, and a tap water pipe 6 is provided at an upper position thereof, and water is supplied from the water supply pipe 5 so that hot water in the tank 1 is pushed up. It's going to be hot water.
A water pipe S is connected to the water supply pipe 5 via a pressure-reducing check valve 11 and a vacuum breaker 11a, so that water can be automatically or manually supplied to the tank of the electric water heater.
[0018]
On the other hand, the reheating heat exchanger 4 is formed in a spiral shape having a diameter smaller than the diameter of the tank 1 so that heat is efficiently exchanged with the hot water stored in the tank 1. , The convection and circulation of the hot water stored in the tank 1 is maintained well, and the heat exchange by the heat exchanger 4 can be performed efficiently and reliably. It can be so.
A plurality of temperature sensors 34, 35, 36 are attached to the body of the tank 1 by changing its mounting position in the vertical direction, and the temperature sensors 34, 35, 36 quickly lower the temperature of hot water in the tank. In addition, accurate detection can be performed, and additional heating by the upper heater 2 and / or the lower heater 3 can be appropriately performed as necessary.
[0019]
Further, the tank 1 of the electric water heater is connected to a bathtub 10 via two pipes 6 and 9, and one of the two pipes 6 and 9 (hereinafter, “hot water side pipe 6”). ), And the hot water of the tank 1 is supplied to the bathtub 10 via the other pipe 9 (hereinafter, referred to as “tap water side pipe 9”). .
[0020]
The hot water side pipe 6 forms a pipe 61 branched from the pipe of the relief valve 30, and the hot water of the pipe 61 passes through a junction T <b> 2 with the pipe 8 of the heat exchanger 4, and passes through the pipes 63 and 64 through the bathtub. 10 to be supplied.
Further, the tap water side pipe 9 branches off from the water pipe S downstream of the pressure-reducing check valve 11, and the water in the tap water side pipe 9 passes through the junction T 1 with the pipe 7 of the heat exchanger 4, It is supplied to the bathtub 10 via 91.
[0021]
On the upstream side of the junction T2 of the hot water pipe 61, a control means 22 including a solenoid valve 19, a flow sensor 20 and a check valve 21 is provided, and at the upstream of the junction T1 of the tap water pipe 9. On the side, a control means 23 having the same configuration is provided.
In addition, temperature sensors 31 and 32 are disposed on the upstream side and the downstream side of the control means 23, respectively.
When these control means 22 and 23 supply the hot water of the electric water heater from the hot water side pipe 6 and the tap water from the water pipe S to the bathtub 10, respectively, the temperature of the hot water supplied to the bathtub 10 and the temperature of the tap water are controlled. On the basis of this, the amount of hot water and tap water in the electric water heater is adjusted, and the temperature and amount of hot water in the bathtub 10 are appropriately controlled, whereby the hot water supply speed can be increased and the hot water supply time can be greatly reduced. .
[0022]
In this case, the hot water side pipe 63 and the tap water side pipe 91 are connected by the connection pipe 24 having the check valve 25, and at least a part of the tap water is connected to the hot water side pipe 64 together with the hot water of the electric water heater. The water is supplied to the bathtub 10 through the tub 10.
Thus, by mixing the tap water with the high-temperature hot water in the hot water-side pipe 64 and lowering the temperature of the hot water, the hot water can be supplied to the bathtub 10 in a state where the temperature of the tap water from the tap water-side pipe 92 is unlikely to be uneven. it can.
[0023]
The control means 22 and 23 are configured to stop supplying tap water to the bathtub 10 and supply only hot water from the electric water heater when the amount of hot water in the bathtub 10 approaches the set amount. .
Thereby, the low-temperature hot water staying at the bottom of the bathtub 10 is stirred by the convection of the hot water finally supplied, so that the temperature of the hot water in the bathtub 10 can be made uniform.
[0024]
Further, the hot water side pipe 63 connected to the bathtub 10 is connected to the pipe 8 of the heat exchanger 4 at the junction T2, and the tap water side pipe 91 is connected to the pipe 7 of the heat exchanger 4 at the junction T1. Thereby, the hot water in the bathtub 10 can be circulated to the heat exchanger 4 and the hot water in the bathtub 10 can be reheated. This makes it possible to reduce the cost particularly when using an electric water heater that uses midnight power. The use of late-night power can be promoted.
[0025]
In the present embodiment, the two pipes 7 and 8 extending from the heat exchanger 4 are connected to the bathtub 10 via the adapter 33, whereby the hot water in the bathtub 10 is circulated through the heat exchanger 4. In this case, the hot water in the bathtub 10 can be reheated.
A mixing valve 18 is connected to the pipe 7 of the heat exchanger 4 on the way, and a water level sensor 12, a strainer 13, and a temperature sensor 14 are connected to the pipe 7 between the mixing valve 18 and the junction T1 of the pipe 91. , A circulation pump 15, a solenoid valve 16 and a check valve 17 are respectively arranged in order from the upstream side. The water level sensor 12 and the temperature sensor 14 detect the water level and the temperature of the bathtub 10. The hot water inside is sucked up, and the hot water in the bathtub 10 is circulated to the heat exchanger 4.
[0026]
In addition, the tap water pipe 93 is branched upstream of the control means 23 of the tap water pipe 9, and the hot water pipe 62 is branched upstream of the control means 22 of the hot water pipe 61. By connecting the side pipe 93 and the hot water side pipe 62 by the mixing valve 26, another pipe path 29 including the temperature sensor 27 and the flow rate sensor 28 is formed.
In the pipe line 29, the amounts of hot water and tap water in the electric water heater can be adjusted based on the set temperature, and the temperature of the hot water supplied through the pipe line 29 can be controlled.
[0027]
As described above, one embodiment of the hot water supply device provided with the electric water heater has been described. However, the hot water supply device of the present invention is not particularly limited thereto, and any hot water tank of a hot water storage type can be used. Further, in the present invention, a hot water supply / heating system is connected to the hot water storage type tank.
[0028]
By the way, in this hot water supply / heating system, a heating heat exchanger (bathroom heating / drying heat exchanger) 41 is provided separately and separately from the reheating heat exchanger 4 provided in the upper part of the tank 1. A heating device (bathroom heating / drying device) 42 disposed in the bathroom, a heating-side heat exchanger 41, and heating-side piping 43, 44 arranged to circulate hot water between the heating device 42, and one of the heating devices. It is composed of an open type expansion tank 45 and a circulation pump 46 connected to the side pipe 43.
[0029]
The heating heat exchanger 41 has a spiral shape similar to the heat exchanger 4 and has a smaller diameter than the diameter of the heat exchanger 4, so that the heat exchanger 41 is concentric with the inner peripheral side of the heat exchanger 4. It is arranged in a way.
Thereby, in the same tank, the two heat exchangers 4 and 41 simultaneously heat water or hot water by heat exchange.
Although not particularly limited, the heating heat exchangers 41 are spirally disposed on the inner peripheral side of the heat exchanger 4 so that the hot water in the bathtub 10 requiring a large amount of heat is provided. It is possible to easily balance the calorific value of the reheating heat exchanger 4 and the heating heat exchanger 41 that requires only a relatively small calorific value.
However, the arrangement relationship between the heat exchanger 41 and the heat exchanger 4 is not limited to the embodiment in which the heat exchangers are arranged concentrically on the inner and outer circumferences. It is also possible to arrange them, and the configuration and arrangement of these two heat exchangers are not limited to this.
[0030]
The expansion tank 45 is provided with an upper limit level sensor 47a and a lower limit level sensor 47b, and an overflow pipe 48. A make-up water pipe 49 branched from the water pipe S is connected to the expansion tank 45, and an on-off valve connected to the make-up water pipe 49. (Water supply solenoid valve) 50 in the expansion tank 45 so that the amount of water circulating between the heat exchanger 41 and the heater 42 is always constant even if the volume expands or contracts due to the temperature change. In addition to the absorption, even when the amount of circulating water is reduced, the circulating water can be replenished by the on-off valve 50 by the detection of the lower limit level sensor 47b. It is possible to circulate between the heaters 42.
The heater 42 is provided with a control device 51, and the control device 51 operates or stops the operation of the heater 42.
The heating-side pipes 43 and 44 are provided with drain cocks 52 and 53 so that drainage in the pipes 43 and 44 can be performed easily and reliably at the time of inspection or the like. , A freezing prevention temperature sensor 54 is provided.
[0031]
Next, the operation of the hot water supply / room heating system using the electric water heater of the water heater as a heat source will be described.
In the winter season or the like, when heating the bathroom when bathing, or when drying the bathroom or drying the laundry dried in the bathroom, the heater 42 is operated. Normally, since the opening / closing valve 50 of the hot water supply / heating system is closed, the water in the heating heat exchanger 41 provided in the tank 1 is heated by heat exchange with the hot water in the tank 1. By driving the circulation pump 46 in this state, hot water heated by heat exchange in the heat exchanger 41 passes between the heat exchanger 41 and the heater 42 to the heating side pipes 43 and 44. Will be circulated through. Since the heat exchanger 42a and the blower 42b are provided in the heater 42, the heat is exchanged in the heater 42, and the air is blown into the bathroom as warm air, thereby heating the bathroom. And / or drying can be performed.
[0032]
In this case, the circulating water for heating is heated when passing through the heat exchanger 41, and expands in volume due to the heating temperature, and conversely, contracts in volume due to a decrease in the temperature of the circulating water. Or Thereby, the volume of the circulating water changes in the sealed heating-side pipes 43 and 44. When the volume changes, the expansion tank 45 arranged in the heating side pipe 43 absorbs the volume change of the circulating water, so that a constant amount of circulating water is always maintained in the circulating pipe. As a result, stable circulation is performed, and heating and / or drying of the bathroom is performed.
[0033]
As described above, the heat exchanger for heating the water in the system piping of the heater is provided in the tank of the electric water heater, and the hot water generated by the heat exchanger is supplied to the heater to perform heating. Because of the method of heating and drying by the air heat exchanger in the machine, especially at the start of operation, the heated water has already been stagnated in the heat exchanger, so the heater was heated to the heater in a short time. It can supply hot water, has excellent temperature rise characteristics, and does not require a combustor as in the boiler hot water system, so even when performing temperature control in the bathroom, combustion is repeatedly started and stopped. The loss at the time of is eliminated.
As with the boiler hot water system, the system supplies hot water to the heater, so it has a larger heating capacity than the electric heater system, and can maintain the same capacity as the boiler hot water system.Furthermore, the electric heater system and the boiler hot water system Unlike this, since the hot water stored using the midnight power can be used, the running cost can be reduced as compared with the electric heater type and the boiler hot water type.
[0034]
FIG. 3 shows a second embodiment of the hot water supply and heating system of the present invention in which the electric water heater of the hot water supply device is used as a heat source for floor heating.
[0035]
In this hot water supply / room heating system, a heating heat exchanger (floor heating heat exchanger) 41 provided independently and separately from a reheating heat exchanger 4 provided in the upper part of the tank 1 and a living room (Floor heater) 42 laid inside the floor, heating-side pipes 43 and 44 laid out so as to circulate hot water between the heating heat exchanger 41 and the heater 42, and one of these heating sides It comprises an open type expansion tank 45 and a circulation pump 46 connected to the pipe 43.
[0036]
In this hot water supply / room heating system, a bypass pipe 56 branched from the heating-side pipe (return side) 43 is connected to a mixing valve 55 provided on a heating-side pipe (outgoing side) 44 from the heating heat exchanger 41. To do.
A mixing valve control temperature sensor 57 is provided downstream of the heating side pipe (outgoing side) 44 in which the mixing valve 55 is disposed, and a heating side pipe (return side) 43 (or floor surface) near the heater 42. ), The floor surface temperature sensors 58 are respectively arranged.
[0037]
Next, the operation of the hot water supply / room heating system using the electric water heater of the water heater as a heat source will be described.
When the floor heating operation is started, the bypass pipe 56 is closed by the mixing valve 55, so that high-temperature hot water heated by the heating heat exchanger 41 disposed in the tank 1 of the electric water heater is supplied to the floor in the living room. It is supplied to the heat exchanger 42a of the heater 42 laid inside the surface, and is operated so that the floor surface temperature reaches a predetermined temperature in a short time.
At this time, the water temperature (or floor temperature) of the heating side pipe (return side) 43 is measured by the floor surface temperature sensor 58, and after the water temperature (or floor temperature) rises to the set temperature, the set temperature is set. To maintain the temperature of the hot water supplied to the heat exchanger 42a of the heater 42 by controlling the amount of water to be bypassed to the bypass pipe 56 by the mixing valve 55, and further, if necessary, the circulation pump 46. Is controlled (the number of rotations of the circulation pump 46 or ON / OFF).
Here, when using the floor heating, it is assumed that the floor heating is used within the boiling time at midnight. In order to ensure that the hot water stored in the tank 1 of the electric water heater is boiled, it is preferable that the heaters 2 and 3 provided in the tank 1 have a larger capacity than usual.
In addition, since the constituent material of the floor surface functions as a heat storage material, the end time of boiling of the electric water heater is predicted within the boiling time at midnight, and after taking into account the load of floor heating, the power time of midnight is considered. By performing floor heating several hours before the end time of the zone, using inexpensive midnight power, heat is stored in the tank 1 of the electric water heater and the constituent materials of the floor, realizing efficient floor heating. can do.
[0038]
Other configurations and operations of the hot water supply / room heating system are the same as those of the first embodiment.
[0039]
As described above, the hot water supply / room heating system of the present invention has been described based on the embodiment, but the present invention is not limited to the configuration described in the above embodiment, and the configuration may be appropriately changed without departing from the gist of the present invention. It can also be applied to a heater other than the bathroom heater / dryer and the floor heater of the above embodiment.
[0040]
【The invention's effect】
According to the hot water supply and heating system of the present invention, a heating heat exchanger is installed in the tank of the electric water heater, and the hot water generated by the heating heat exchanger using the electric water heater as a heat source device is installed indoors. Since heating (and / or drying) is performed by supplying heat to the heat exchanger and using a heat exchanger of the heater, a new heat source is not required for heating (and / or drying) the room, and equipment costs are reduced. In addition, the running cost can be reduced.
Also, at the start of operation, the heated hot water is already stagnant in the heat exchanger installed in the tank, so the heated hot water can be supplied to the heater installed indoors in a short time, and the temperature rises. It has excellent characteristics and does not require a combustor unlike the boiler hot water system.Therefore, there is no combustion loss due to repeated combustion operation and stoppage even when performing indoor temperature control, and the heating capacity Can be increased.
In addition, the expansion tank arranged in the heating circuit can absorb the expansion and contraction of the volume of the circulating water due to the temperature change, so that the amount of water in the heating circuit can be kept constant, and the heat exchange for heating can be performed. Hot water can be circulated stably between the vessel and the heater installed in the room.
Furthermore, a makeup water pipe is configured so as to branch and take in makeup water to the expansion tank from the water heater or hot water supply pipe of the electric water heater, and an opening / closing valve that automatically opens and closes the makeup water pipe according to the water level of the expansion tank. Since the circulating water is provided, the circulating water can be replenished even when the amount of circulating water is reduced, so that maintenance can be simplified.
[0041]
In addition, the heat exchanger for heating and the heat exchanger for reheating the hot water in the bathtub are each formed in a spiral shape having a different winding diameter, and are installed in parallel in the upper part of the tank of the electric water heater, so that the electric water heater is provided. The upper space in the tank of the water heater can be effectively used, the amount of hot water required when the inside of the tank of the electric water heater is reheated by the upper heater can be reduced, and the energy cost can be reduced.
[0042]
Also, the winding diameter of the heating heat exchanger is formed smaller than the winding diameter of the heat exchanger for reheating the hot water in the bathtub, and the heat exchanger for reheating the hot water in the bathtub is formed around the outer periphery of the heating heat exchanger. By disposing the heat exchanger, it is possible to easily balance the calorific value of the heat exchanger for reheating the hot water in the bathtub, which requires a large amount of heat, and the heat exchanger for heating, which requires only a relatively small amount of heat. it can.
[0043]
Furthermore, by performing heat storage by performing heating by a heater before the end time of the midnight power time zone, by using inexpensive midnight power, the electric water heater and, for example, to the constituent material of the floor surface Heat can be stored and efficient heating can be realized.
[Brief description of the drawings]
FIG. 1 is a schematic structural view showing a first embodiment of a hot water supply / room heating system of the present invention.
FIG. 2 shows an electric water heater used in the hot water supply / heating system of the present invention, wherein (A) is a sectional view and (B) is a front view of a heat exchanger provided in a tank of the electric water heater.
FIG. 3 is a schematic structural view showing a second embodiment of the hot water supply / room heating system of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric water heater tank 2 Upper heater 3 Lower heater 4 Heat exchanger 5 Water supply pipe 6 Hot water side pipe 7 Heat exchanger pipe 8 Heat exchanger pipe 9 Tap water side pipe 10 Bathtub 41 Heating heat exchanger (bathroom Heat exchanger for heating and drying, heat exchanger for floor heating)
42 heater (bathroom heater / dryer, floor heater)
43 Heating side pipe 44 Heating side pipe 45 Expansion tank 46 Circulation pump 47a Upper limit level sensor 47b Lower limit level sensor 48 Overflow pipe 49 Makeup water pipe 50 Opening / closing valve (water supply solenoid valve)
51 Controller

Claims (4)

The hot water was supplied to the bathtub from the electric water heater, and the space between the heating heat exchanger installed in the upper part of the tank of the electric water heater and the heater installed in the room was heated in the heat exchanger. In a hot water supply / heating system provided with a heating circuit in which hot water is circulated by a circulation pump, an expansion tank is provided in the heating circuit, and supply water to the expansion tank is supplied from a water supply or hot water supply pipe of an electric water heater. A hot water supply / heating system, wherein a makeup water pipe is configured so as to be branched and taken in, and an opening / closing valve that automatically opens and closes in accordance with the water level of the expansion tank is arranged in the makeup water pipe. The heat exchanger for heating and the heat exchanger for reheating the hot water in the bathtub are each formed in a spiral shape having a different winding diameter, and are installed in parallel in an upper part in a tank of the electric water heater. The hot water supply and heating system according to 1. The winding diameter of the heat exchanger for heating is formed smaller than the winding diameter of the heat exchanger for reheating the hot water in the bathtub, and the heat exchanger for reheating the hot water in the bathtub is arranged around the heat exchanger for heating. The hot water supply / heating system according to claim 2, wherein the hot water supply / heating system is provided. 4. The hot water supply / heating system according to claim 1, wherein the heat storage is performed by performing the heating by the heater before the end time of the midnight power time zone.

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