JP2017225757A - Hot water heating device and mist apparatus including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water heating device capable of appropriately controlling a temperature after heating a heating-object hot water by a heat exchanger, while simplifying a whole structure and reducing the manufacturing cost.SOLUTION: A hot water heating device B including a heat exchanger 3 that heats heating-object hot water by heat exchange between the heating-object hot water and heating hot water flowing in first and second hot water flow passages 1 and 2 respectively, includes a temperature regulating valve V. The temperature regulating valve V includes: a valve element 60 provided at the second hot water flow passage 2 for changing an amount of the heating hot water to be supplied to the heat exchanger 3; and a temperature-sensitive actuator 62 provided to detect a temperature after the heating of the heating-object hot water and operating the valve element 60 in association with the detected temperature so as to, when the detected temperature is high, decrease the amount of the heating hot water to be supplied to the heat exchanger 3 more than a case where the detected temperature is low.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot water heating apparatus of a type that uses a heat exchanger to heat heated hot water (hot water to be heated) with hot water for heating, and a mist device including the same.

An example of a mist device is disclosed in Patent Document 1.
The mist device described in the document enables heating of mist hot water supplied to a mist ejection nozzle installed in a bathroom using a so-called liquid-liquid heat exchanger. The heat exchanger is fed with hot water for mist and hot water for heating for heating the hot water for mist. It is possible to enhance the comfort of the mist bath by heating the hot water for mist and ejecting warm mist from the mist ejection nozzle.

  However, in the past, as described below, there is still room for improvement.

  In order to further enhance the comfort of the mist bath, it is desired to stabilize the temperature of the mist around a desired target temperature. For that purpose, it is necessary to stabilize the temperature after heating the hot water for mist by the heat exchanger. However, for example, when tap water is used as hot water for mist, the temperature is not constant. Therefore, if the temperature and flow rate of the hot water supplied to the heat exchanger are simply fixed, after heating the hot water for mist, It is difficult to stabilize the temperature at around the desired target temperature. On the other hand, in patent document 1, the means for adjusting the temperature after heating the hot water for mist is not taken, and the above-mentioned malfunction cannot be solved appropriately.

  As a means for stabilizing the temperature after heating the hot water for mist around the desired target temperature, a temperature sensor is used to detect the temperature after heating the hot water for mist, and a heat exchanger is used according to the detected temperature. It is conceivable to control the supply amount of hot water for heating using an electromagnetic or electric flow control valve. However, according to such means, in addition to the temperature sensor and the electromagnetic or electric flow rate regulating valve, a control circuit for controlling the flow rate regulating valve is also required, which is disadvantageous in that these costs are expensive. There is.

  The problems as described above are not limited to the case where the hot water for mist is heated in the mist device for bathrooms, but occurs in the case where a system for heating desired hot water using a so-called liquid-liquid heat exchanger is adopted. .

Japanese Patent No. 4651949

  The present invention has been conceived under the circumstances as described above, and the temperature after heating hot water by the heat exchanger is reduced while simplifying the overall structure and reducing the manufacturing cost. An object of the present invention is to provide a hot and cold water heating device that can be appropriately controlled and a mist device including the hot water heating device.

  In order to solve the above problems, the present invention takes the following technical means.

  The hot and cold water heating device provided by the first aspect of the present invention includes first and second hot water channels through which heated hot water and hot water for heating individually circulate, and these first and second hot water channels. And a heat exchanger for heating the hot water to be heated by heat exchange between the hot water to be heated and the hot water for heating. Provided with a temperature adjustment valve for controlling the temperature after heating of the hot water to be heated, which is provided in the second hot water channel and for heating the heat exchanger. A valve body for changing the amount of hot water supplied, and the temperature after heating of the hot water to be heated can be detected, and when the detected temperature is high, the hot water for heating to the heat exchanger is lower than when the temperature is low The sensing temperature so that the supply amount of Is characterized in that correspondingly comprises a temperature-sensitive actuator for operating said valve body.

According to such a configuration, the following effects can be obtained.
That is, the temperature adjustment valve corresponds to the temperature of the heated hot water so that when the temperature after heating of the heated hot water by the heat exchanger is high, the amount of hot water supplied to the heat exchanger is smaller than when the temperature is low. Therefore, it is possible to appropriately control to stabilize the temperature after heating the hot water to be around a desired target temperature. On the other hand, according to the present invention, since the temperature adjustment actuator is provided with the temperature adjustment valve, a temperature sensor is not necessary, and it is not necessary to use an electromagnetic or electric type as the temperature adjustment valve. Furthermore, a control circuit for controlling the operation of the temperature regulating valve can be eliminated. Accordingly, it is possible to appropriately simplify the configuration of the hot water heater and reduce the cost.

  In the present invention, preferably, the temperature-sensitive actuator is arranged in the first hot water flow path so that at least a part thereof is in contact with the heated hot water after passing through the heat exchanger, or It arrange | positions in the location connected to the said 1st hot water flow path.

  According to such a configuration, the temperature of the hot water to be heated can be appropriately sensed by the temperature-sensitive actuator, which is preferable for proper operation of the temperature adjustment valve.

  In the present invention, preferably, the temperature regulating valve is a hollow casing member provided so as to connect the first and second tubular members that form the first and second hot water flow paths, respectively. A valve shaft disposed inside the casing member to support the valve body and reciprocated in the axial length direction of the casing member by the temperature-sensitive actuator; and the valve shaft is slid in the axial length direction. And a water stop seal is provided in a region between the valve shaft and the first and second hot water passages to prevent the first and second hot water passages from communicating with each other through the inside of the casing member. And a partition wall provided to do so.

  According to such a configuration, while preventing a cross connection (inflow of hot water from one of the first and second hot water channels to the other) between both the first and second hot water channels, The temperature adjustment valve can be assembled to the first and second tubular members, and the operation intended by the present invention can be appropriately caused in the temperature adjustment valve.

  In the present invention, preferably, the temperature-sensitive actuator is a shape memory alloy spring, and the casing member has a spring holding portion for accommodating and positioning the shape memory alloy spring inside, The spring holding portion is provided with a plurality of openings that allow the hot water to flow in and out between the inside and outside of the spring holding portion.

According to such a configuration, since the shape memory alloy spring is used as the temperature-sensitive actuator, advantages such as a reduction in the cost of the parts can be obtained. Besides, the shape memory alloy spring can be properly positioned and held by using the spring holding portion, and the degree to which the hot water is in contact with the shape memory alloy spring is increased, and the temperature of the hot water is accurately adjusted to the shape memory alloy spring. It can also be perceived.

  In the present invention, preferably, as the partition wall portion, at least two partition wall portions arranged in the axial length direction are provided, and a gap is formed between the two partition wall portions, and the casing When heated hot water or hot water for heating leaks into the gap from at least one of the first and second hot water flow paths, the leaked hot water flows from the gap to the casing wall of the casing member. A drainage hole that can be discharged to the outside is provided.

  According to such a configuration, it is possible to more thoroughly prevent the occurrence of cross connection between the first and second hot water flow paths.

  The mist device provided by the second aspect of the present invention is capable of heating the hot water heating device provided by the first aspect of the present invention and the hot water for heating at a position upstream of the heat exchanger. A mist spraying means capable of misting and spraying the supplied hot water, and the first hot water flow path uses the hot water from a hot water supply source as the heated hot water for the heat exchange. It is provided so that the to-be-heated hot water which supplied to the container and passed the said heat exchanger may be supplied to the said mist ejection means.

  According to such a configuration, the same effect as described for the hot water heater provided by the first aspect of the present invention can be obtained, and when the mist is ejected, the mist temperature is preferably stabilized. Can do.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a schematic explanatory drawing which shows an example of the mist apparatus which concerns on this invention. It is principal part sectional drawing which shows the temperature control valve with which the mist apparatus shown in FIG. 1 was equipped. It is a principal part perspective view of FIG. It is principal part sectional drawing which shows the other example of this invention.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  A mist device A shown in FIG. 1 is installed in a hot water heating device B, a heat source device 40, and a bathroom configured by combining a plate-type heat exchanger 3 as a liquid-liquid heat exchanger and a temperature control valve V. At least one mist ejection nozzle 41 and first and second hot water flow paths 1 and 2 are provided.

  The heat source device 40 has the same configuration as, for example, a gas hot water supply device, has a hot water heating function, and is connected to the heat exchanger 3 via the second hot water flow channel 2 (2a, 2b). ing. The second hot water flow path 2 is a circulation flow path, and heating hot water existing in the second hot water flow path 2 is heated in the heat source unit 40 by opening the on-off valve 42 as a thermal valve. Then, it can be sent to the heat exchanger 3 and then returned to the heat source unit 40.

The first hot water flow channel 1 (1a, 1b) uses hot water supplied from a hot water supply source 43 such as a water pipe as hot water for mist, and after the hot water for mist is sent to the heat exchanger 3, It is a flow path that leads to the mist ejection nozzle 41. The hot water for mist corresponds to an example of hot water to be heated in the present invention. The heat exchanger 3 can heat the hot water for mist by causing heat exchange between the hot water for mist and the hot water for heating. The structure itself of the heat exchanger 3 is the same as that of a conventionally known plate heat exchanger, and the description thereof is omitted.

The mist device A further includes a bimetal switch SW1, a mist open / close valve 45, a pressure switch SW2, and a relay circuit 44 provided in the first hot water flow channel 1, and the following operation is executed. It is configured as follows.
That is, when the mist opening / closing valve 45 is opened, mist is ejected from the mist ejection nozzle 41. At that time, the pressure switch SW2 detects an increase in pressure and outputs a contact ON signal to the relay circuit 44. Then, a contact point ON signal is output from the relay circuit 44 to the heat source device 40, the heat source device 40 starts a hot water heating operation, and power for opening operation is supplied to the on-off valve 42. Thus, hot water for heating circulates between the heat source device 40 and the heat exchanger 3, and the hot water for mist is heated by the hot water for heating in the heat exchanger 3. Although the specific configuration and operation of the temperature adjustment valve V will be described later, the temperature adjustment valve V is controlled so that the temperature after heating the hot water for mist by the heat exchanger 3 is stabilized around a desired target temperature. Is done. When the mist open / close valve 45 is closed, the contact of the pressure switch SW2 is turned off, so that the signal output from the relay circuit 44 to the heat source device 40 is turned off and the operation of the heat source device 40 is stopped. At the same time, the on-off valve 42 is closed by turning off the power supply.

The bimetal switch SW1 is used for freeze prevention operation. Specifically, when the temperature of the installation location of the bimetal switch SW1 falls below a predetermined temperature for preventing freezing, the bimetal switch SW1 outputs a contact ON signal to the relay circuit 44. Thereby, the operation of the heat source device 40 is started and the opening / closing valve 42 is opened, and the hot water heated by the heat source device 40 circulates in the second hot water channel 2 to prevent freezing. When the heat exchanger 3 is warmed by hot water for heating and the detected temperature of the bimetal switch SW1 exceeds a predetermined temperature due to the conduction heat or the like, the contact is turned off, the operation of the heat source unit 40 is stopped, and the on-off valve 42 is closed. It is.
In the operation control described above, it is not necessary to use a control circuit equipped with a complicated control program, and the manufacturing cost of the mist device A can be reduced.

  As shown in FIG. 2, the temperature adjustment valve V includes a casing member 5 that connects the first and second tubular members 10, 20 configured as a pipe joint, a valve body 60, and a valve shaft 61 that supports the casing member 5. A shape memory alloy spring 62, a bias spring 63, and two partition walls 7a and 7b are provided as an example of a temperature sensitive actuator.

  The first and second tubular members 10 and 20 are members constituting a part of each of the first and second hot water flow paths 1 and 2, and are provided in an arrangement close to each other. The first tubular member 10 is a member located in the vicinity of the outlet of the heat exchanger 3 in the first hot water flow channel 1 shown in FIG. 1, and the second tubular member 20 is the second tubular member 20. It is a member located in the vicinity of the inlet of the heat exchanger 3 in the hot water channel 2. The first and second tubular members 10 and 20 are connected to other piping members that form the first and second hot water flow paths 1 and 2. The hot water for mist after being heated by the heat exchanger 3 flows, while the hot water for heating before being fed into the heat exchanger 3 flows in the second tubular member 20. Short tubular branch tube portions 10a and 20a are connected to the first and second tube members 10 and 20, respectively. The axial length direction of these branch pipe parts 10a and 20a is the same direction as the axial length direction of the casing member 5 (the left-right direction in FIG. 2).

The casing member 5 has a hollow shape (internal hollow shape) and is connected to each of the first and second tubular members 10 and 20. The casing member 5 is connected to the first tubular member 10 by engaging a part of the casing member 5 into the branch tubular body portion 10a and then engaging and locking the outer periphery of the casing member 5 on the outer periphery. And the distal end flange portion 10b of the branch tube portion 10a are locked and held using a fixture 81 so as not to be separated from each other. The fixing device 81 is, for example, called a quick fastener, and is a known member described in FIG. 6 of Japanese Patent Application Laid-Open No. 2006-266651. The casing member 5 is connected to the second tubular body member 20 by, for example, bringing one end portion of the casing member 5 into contact with the distal end flange portion of the branch tubular body portion 20a and fastening them using the bolts 82. It is planned by.

  The valve body 60 is disposed opposite to the valve opening 21 provided on the inner side of the second tubular body member 20 and the valve seat 22 around the valve opening portion 21, and reciprocates in the axial length direction of the casing member 5. The flow rate of hot water for heating can be changed. The valve shaft 61 supports the valve body 60 at the tip, and is slidable in the axial direction of the casing member 5 in the casing member 5. The bias spring 63 is a normal coil spring, and is disposed between the abutting member 64 and the partition wall portion 7a mounted near the base end portion of the valve shaft 61, thereby retracting the valve shaft 61. Always biased in the direction (right side of FIG. 2).

  The shape memory alloy spring 62 is a coil spring made of a shape memory alloy such as Ni—Ti or Ni—Ti—Cu, and at least a part of the shape memory alloy spring 62 is provided so as to be located in the first hot water channel 1. It can detect the temperature of hot water. The shape memory alloy spring 62 is housed in a spring holding portion 50 provided continuously with the casing member 5, and is positioned and held so that one end of the shape memory alloy spring 62 is in contact with the contact member 64. The spring holding portion 50 has a configuration in which a plurality of strip-like portions 50a extending in the axial length direction of the casing member 5 are arranged at intervals in the circumferential direction on the outer periphery of the shape memory alloy spring 62 (see also FIG. 3). . Between each of the belt-like portions 50a, there is an elongated rectangular opening 50b through which hot water for mist can pass. The spring holding part 50 and the shape memory alloy spring 62 are provided so as to protrude from the inside of the branch pipe part 10a to the first hot water channel 1 side. Further, a gap C1 through which hot water for mist can enter is provided between the spring holding portion 50 and the peripheral wall of the branch pipe body portion 10a, and substantially the entire shape memory alloy spring 62 is immersed in the hot water for mist. It has become.

  The shape memory alloy spring 62 changes so that the spring constant becomes larger when the sensed temperature is high than when it is low. When the spring constant increases, the contact member 64 and the valve shaft 61 are pushed forward (left side in FIG. 2) by the shape memory alloy spring 62 against the elastic force of the bias spring 63, and the valve body 60. As a result, the amount of hot water supplied to the heat exchanger 3 decreases. On the other hand, when the sensing temperature decreases, the spring constant of the shape memory alloy spring 62 decreases, the valve body 60 moves backward by the elastic force of the bias spring 63, and hot water for heating to the heat exchanger 3. The supply of will increase.

  The partition walls 7a and 7b support the valve shaft 61 so as to be slidable, prevent the first and second hot water flow paths 1 and 2 from communicating with each other, and prevent cross-connection between them. It is. These partition walls 7 a and 7 b are configured using auxiliary members 70 a and 70 b that are separate from the casing member 5. Specifically, the one partition wall portion 7a has a configuration in which the auxiliary member 70a is fitted into the hole portion of the casing member 5 and a water-stop seal portion using an O-ring 71a is provided therebetween. The other partition wall portion 7b has a configuration in which the auxiliary member 70b is fitted into the branch pipe body portion 20a and a water-stop seal portion using an O-ring 71b is provided between them. Between the outer peripheral surface of the valve shaft 61 and the inner peripheral surfaces of the partition walls 7a and 7b, a water stop seal portion using O-rings 72a and 72b is provided so that the valve shaft 61 can slide. . At the end of the partition wall portion 7a on the partition wall portion 7b side, a pop-out preventing portion for the fixing washer of the O-ring 72b of the other partition wall portion 7b is provided.

A gap 58 having an appropriate width in the axial direction of the casing member 5 is formed between the partition walls 7a and 7b. On the other hand, the peripheral wall portion of the casing member 5 is provided with at least one drain hole 59 communicating with the gap portion 58. For example, when a seal failure occurs in the water stop seal portion using the O-ring 72b, the hot water for heating in the second hot water channel 2 passes through the seal failure portion as indicated by arrows N1 and N2. There is a risk of leakage into the gap 58. The drain hole 59 is useful for discharging the leaked hot water as described above from the inside of the gap 58 to the outside of the casing member 5 as indicated by an arrow N3. The same applies to the case where the hot water for mist leaks into the gap portion 58 due to the occurrence of a sealing failure in the water stop seal portion using the O-ring 72a.

  Next, the operation of the hot water heating device B and the mist device A will be described.

  First, the temperature adjustment valve V operates such that when the temperature after heating the hot water for mist by the heat exchanger 3 is high, the amount of hot water supplied to the heat exchanger 3 is less than when the temperature is low. It is possible to stabilize the temperature after heating the hot water at a temperature near the desired target temperature. Therefore, the temperature of the mist ejected from the mist ejection nozzle 41 can be maintained at an optimum temperature for a mist bath and the like, and the user's comfort can be enhanced.

  On the other hand, the temperature control of the mist described above is executed using the temperature control valve V using the shape memory alloy spring 62. The temperature control valve V has a simple configuration and is manufactured at a relatively low cost. Is possible. In addition, in the mist device A of the present embodiment, as means for controlling the temperature after heating the hot water for mist by the heat exchanger 3, a dedicated temperature sensor, an electromagnetic or electric flow control valve, and There is no need to use such a control circuit. Therefore, simplification of the configuration of the mist device A and cost reduction can be appropriately achieved.

  The shape memory alloy spring 62 is in a state of projecting from the inside of the branch pipe body portion 10a to the first hot water channel 1 side, and the spring holding portion 50 has a plurality of openings 50b through which mist hot water flows in and out. Are provided with a large aperture ratio. Further, a gap C <b> 1 through which hot water for mist flows is provided around the spring holding portion 50. For this reason, the hot water for mist flowing through the first hot water flow channel 1 directly contacts substantially the entire shape memory alloy spring 62 with a high contact frequency. As a result, the shape memory alloy spring 62 can be made to react rapidly with respect to the temperature change of the mist hot water, and the temperature adjustment valve V can be made excellent in responsiveness.

  Since the first and second tubular members 10 and 20 are connected via a hollow casing member 5 in which a valve shaft 61 is disposed, the first and second hot water flow paths 1 are used. , 2 needs to be prevented appropriately. On the other hand, as described above, the two partition wall portions 7a and 7b are provided in the casing member 5 in a state in which a water sealing is appropriately achieved. Further, for example, as indicated by arrows N1 to N3, even if the hot water for heating in the second hot water flow channel 2 leaks to the gap 58, the leaked hot water passes from the drain hole 59 to the outside of the casing member 5. Since it is discharged, it does not travel to the first hot water flow path 1. Based on such an action, it is possible to thoroughly prevent the occurrence of cross connection between the first and second hot water flow paths 1 and 2.

  FIG. 4 shows another embodiment of the present invention. In the figure, the same or similar elements as those in the above embodiment are given the same reference numerals as in the above embodiment.

In the structure shown in FIG. 4, the first tubular member 10A has a different configuration from the first tubular member 10 shown in FIG. 2, and is formed in the first tubular member 10A. The first hot water channel 1 is bent in a substantially L shape. The branch tube portion 10 a of the first tube member 10 </ b> A is provided in an arrangement facing the hot water inlet 18. For this reason, the shape memory alloy spring 62 is also positioned in the first hot water flow channel 1 so as to face the hot water inlet 18.
According to such a configuration, when the hot water for mist flows into the first tubular member 10 </ b> A from the hot water inlet 18, the hot water for mist reaches the position of the shape memory alloy spring 62 as it is. Accordingly, the hot water for mist can be brought into contact with the entire shape memory alloy spring 62 more efficiently.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the hot water heater and the mist device according to the present invention can be modified in various ways within the intended scope of the present invention.

As the temperature-sensitive actuator, a shape memory alloy spring having a shape other than the coil shape can be used. For example, a wax thermoelement (paraffin wax whose volume changes depending on the temperature is enclosed in the case, and the volume change of the wax is Can also be used).
The heat exchanger for heating the hot water to be heated is not limited to the plate type heat exchanger but may be of other types.

The partition wall portion of the temperature control valve only needs to be provided so as to prevent the first and second hot water flow paths from communicating with each other through the inside of the casing member, and is different from the above-described embodiment. For example, a configuration in which only one is provided is also possible.
The spring holding portion of the temperature regulating valve can be formed using, for example, a water-permeable mesh member.

The heated hot water referred to in the present invention is not limited to hot water for mist, and other hot water can be used as heated hot water. The hot water heating apparatus according to the present invention can be used as a component of an apparatus different from the mist apparatus.
In the mist device according to the present invention, the mist ejection means is not limited to the mist ejection nozzle. For example, as described in Japanese Patent No. 4905232, mist is generated by splashing hot water around the rotor using the centrifugal force of the rotor rotated using a motor. A mist generator can also be used.

A Mist device B Hot water heating device V Temperature control valve 1, 1st and 2nd hot water flow path 3 Heat exchanger 40 Heat source device 41 Mist ejection nozzle (mist ejection means)
5 Casing member 50 Spring holding part 50b Opening part (of spring holding part)
58 Air gap 59 Drain hole 60 Valve body 61 Valve shaft 62 Shape memory alloy spring (temperature-sensitive actuator)
7a, 7b Bulkhead

Claims (6)

First and second hot water passages through which heated hot water and hot water for heating flow individually,
A heat exchanger connected to the first and second hot water flow paths and for heating the heated hot water by heat exchange between the heated hot water and the heated hot water; and
A hot water heating apparatus comprising:
A temperature adjusting valve for controlling the temperature of the heated hot water heated by the heat exchanger;
This temperature control valve
A valve body provided in the second hot water flow path and for changing a supply amount of the hot water for heating to the heat exchanger;
It is provided so that the temperature after heating of the heated hot water can be sensed, and corresponds to the sensed temperature so that when the sensed temperature is high, the amount of hot water supplied to the heat exchanger is less than when the sensed temperature is low. A temperature sensitive actuator for operating the valve body;
A hot water heating device comprising: A hot water heating apparatus according to claim 1,
The temperature-sensitive actuator is arranged in the first hot water channel or at least a part of the temperature sensitive actuator so as to contact the heated hot water after passing through the heat exchanger, or the first hot water channel. A hot and cold water heating device that is placed in a place that communicates with the hot water. A hot water heating apparatus according to claim 1 or 2,
The temperature regulating valve is
A hollow casing member provided so as to connect the first and second tubular members forming the first and second hot water flow paths, respectively;
A valve shaft disposed inside the casing member to support the valve body and reciprocated in the axial length direction of the casing member by the temperature-sensitive actuator;
The valve shaft is slidably supported in the axial direction, a water seal is provided in a region between the valve shaft, and the first and second hot water flow paths are formed on the casing member. A partition provided to prevent communication with each other through the interior;
A hot water heating device. A hot water heating apparatus according to claim 3,
The temperature sensitive actuator is a shape memory alloy spring,
The casing member has a spring holding portion for housing and positioning the shape memory alloy spring, and the spring holding portion is provided between the inside and the outside of the spring holding portion. A hot water heating apparatus provided with a plurality of openings that allow the hot water to flow in and out. A hot water heating apparatus according to claim 3 or 4,
As the partition wall, at least two partition walls aligned in the axial length direction are provided, and a gap is formed between the two partition walls,
When heated hot water or hot water for heating leaks into the gap from at least one of the first and second hot water flow paths, the leaked hot water flows from the gap to the casing on the peripheral wall of the casing member. A hot water heating apparatus provided with a drain hole that can be discharged to the outside of the member. A hot water heating apparatus according to any one of claims 1 to 5,
A heat source device capable of heating the hot water for heating at a position upstream of the heat exchanger;
Mist spraying means capable of misting the supplied hot water and mist,
With
The first hot water flow path supplies hot water from a hot water supply source to the heat exchanger as the heated hot water, and supplies the heated hot water that has passed through the heat exchanger to the mist ejecting means. The mist device provided in

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