JP3859829B2 - One can two water bath hot water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a canned two-way bath water heater in which a hot water supply heat exchanger and a reheating heat exchanger are integrated, and the integrated heat exchanger is heated by a common burner.
[0002]
[Prior art]
FIG. 4 shows a system configuration example of a single can two water bath hot water heater developed by the applicants. In this figure, this single can two water channel bath water heater (equipment) has a combustion chamber 1 surrounded by an inner body 29, a burner 2 is disposed in the combustion chamber 1, and an upper side of the combustion chamber 1. A hot water supply heat exchanger 3 and a reheating heat exchanger 4 are provided above the burner 2. These hot water supply heat exchangers 3 and reheating heat exchangers 4 are integrated. That is, the hot water supply side pipe line is inserted through a plurality of common fin plates 5 to form the hot water supply heat exchanger 3, and the reheating side pipe line is also inserted through the fin plate 5 to reheat the heat exchanger. The burner 2 is configured to heat both the hot water supply heat exchanger 3 and the reheating heat exchanger 4.
[0003]
The combustion chamber 1 on the lower side of the burner 2 communicates with an air supply passage 6, and a combustion fan 7 is incorporated in the air supply passage 6. Then, air is sent to the burner 2 and exhaust gas generated by the combustion of the burner 2 is discharged to the outside from the exhaust passage 9 communicating with the combustion chamber 1 above the burner 2.
[0004]
A gas nozzle 19 is disposed opposite to the gas inlet of the burner 2, and a gas supply passage 8 for introducing fuel gas is connected to the gas nozzle 19, and the fuel gas introduced by the gas supply passage 8 is connected to the gas nozzle 19. Is supplied to the burner 2 via the gas nozzle 19. The gas supply passage 8 is provided with electromagnetic valves 10, 11a, 11b for opening and closing the passage, and a proportional valve 12 for controlling the gas supply amount by the valve opening amount.
[0005]
One end side of the water supply passage 13 is connected to the inlet side of the hot water supply heat exchanger 3, and one end side of the hot water supply passage 14 is connected to the outlet side of the hot water heat exchanger 3, and the other end of the water supply passage 13 is connected. The other end side (outlet side) of the hot water supply passage 14 is led to a desired hot water supply place such as a kitchen via the external pipe. Further, a bypass passage 27 and a bypass passage 15 that bypass the hot water supply heat exchanger 3 and connect the water supply passage 13 and the hot water supply passage 14 are provided, and a bypass valve that opens and closes the passage is provided in the bypass passage 15. 16 is interposed.
[0006]
One end of a pipe 18 is connected to the inlet side of the reheating heat exchanger 4, and the other end of the pipe 18 is connected to the discharge port of the circulation pump 20. One end side of the return pipe 21 is connected, and the other end side of the return pipe 21 is connected to the bathtub 22. In addition, one end side of a pipe line 23 is connected to the outlet side of the reheating heat exchanger 4, and the other end side of the pipe line 23 is connected to the bathtub 22. The return pipe 21, the circulation pump 20, the pipe 18, the reheating heat exchanger 4, and the line 23 constitute a recirculation circulation path 24.
[0007]
The pipe 18 of the recirculation circulation passage 24 and the hot water supply passage 14 are communicated with each other by a hot water filling passage 25, and the hot water filling passage 25 has a pouring control valve 26 for controlling the opening and closing of the passage, and the water level of the bathtub 22. And a water level sensor 28 for detecting the above.
[0008]
In the figure, 30 is an air volume sensor that detects the air volume in the combustion chamber 1, 31 is a water volume sensor that is provided in the water supply passage 13 and detects the flow rate of the water supply, and 32 is water in the water supply passage 13. A water temperature sensor for detecting temperature, 34 is a flow rate control valve provided in the hot water supply passage 14 to control the flow rate of water flow, and 35 is provided in the hot water supply passage 14 to indicate that hot water is being supplied. A hot water supply confirmation switch to be detected, 36 is a water flow sensor for detecting the water flow in the recirculation circulation passage 24, and 37 is a circulation passage hot water temperature for detecting the hot water in the recirculation circulation passage 24 as a bath water temperature (bath temperature). A bath temperature sensor which is a detection means, and 38 is a hot water temperature sensor which detects the temperature of hot water produced by the hot water supply heat exchanger 3.
[0009]
A control device 40 is provided in the single can two water bath hot water heater, and a remote controller 41 is connected to the control device 40. The remote control 41 is provided with hot water supply temperature setting means for setting the hot water supply temperature, bath temperature setting means for setting the bath temperature of the bathtub 22, bath water level setting means for setting the hot water level of the bathtub 22, and the like. ing.
[0010]
The control device 40 takes in sensor output signals from various sensors and information from the remote controller 41, and performs various appliance operations such as a hot water supply operation, a hot water filling operation and a reheating operation according to the information and a sequence program given in advance. The operation is controlled as follows.
[0011]
For example, when a faucet of a hot water supply passage led to a kitchen or the like is opened, water flows into the water supply passage 13 from a water supply source, and the water amount sensor 31 detects water passing through the water supply passage 13, the appliance starts a hot water supply operation. . First, the rotational drive of the combustion fan 7 is started, and both or one of the solenoid valves 11a and 11b and the solenoid valve 10 are opened to supply the fuel gas to the burner 2 through the gas supply passage 8, which is not shown. The burner 2 is ignited by ignition means to start combustion.
[0012]
Then, the valve opening amount of the proportional valve 12 is controlled (the amount of gas supplied to the burner 2 is controlled) so that the hot water temperature becomes the hot water setting temperature set in the hot water temperature setting means. The combustion capacity is controlled, and the water flowing through the hot water supply heat exchanger 3 is heated by the combustion flame of the burner 2 to produce hot water having a set temperature, and this hot water is supplied to the hot water supply place through the hot water supply passage 14.
[0013]
When the use of hot water is finished and the faucet is closed, water flow to the hot water supply heat exchanger 3 is stopped, and the electromagnetic valve 10 is closed when the water amount sensor 31 no longer detects water flow through the water supply passage 13. The combustion of the burner 2 is stopped. Thereafter, when a predetermined post-purge period (for example, 5 minutes) elapses, the rotation drive of the combustion fan 7 is stopped, the hot water supply operation is terminated, and the next hot water supply is prepared.
[0014]
When performing the hot water filling operation, for example, the pouring control valve 26 is opened, and by the opening operation of the pouring control valve 26, water flows from the water supply source into the water supply passage 13, and the water amount sensor 31 is connected to the water supply passage 13. When water flow is detected, combustion of the burner 2 is started similarly to the hot water supply operation.
[0015]
Hot water produced in the hot water supply heat exchanger 3 by the combustion flame of the burner 2 is sent to the recirculation circulation passage 24 through the hot water supply passage 14 and the hot water filling passage 25 in order, and the hot water flowing into the recirculation circulation passage 24 returns. It is dropped into the bathtub 22 by two paths, a path passing through the pipe 21 and a path passing through the reheating heat exchanger 4. When the water level of the bathtub 22 detected by the water level sensor 28 reaches the set water level set in the remote controller 41, the pouring control valve 26 is closed, the electromagnetic valve 10 is closed, and the combustion of the burner 2 is stopped. The hot water filling operation is terminated.
[0016]
When the reheating operation is performed, the circulation pump 20 is driven to circulate hot water in the bathtub 22 through the recirculation circulation passage 24, and combustion of the burner 2 is started, and the reheating heat exchanger 4 is heated by the combustion flame of the burner 2. Heat up the circulating hot water and reheat. When the bath temperature detected by the bath temperature sensor 37 reaches the set temperature set by the bath temperature setting means, the combustion of the burner 2 is stopped and the reheating operation is ended.
[0017]
As described above, the canned and two-channel bath water heater is a system in which the integrated hot water supply heat exchanger 3 and the reheating heat exchanger 4 are heated using the common burner 2, and therefore, a hot water supply provided separately. Compared with the method in which the heat exchanger and the reheating heat exchanger are each heated by combustion using separate burners, the device configuration can be simplified, and accordingly, the device can be downsized and the cost can be reduced. .
[0018]
[Problems to be solved by the invention]
By the way, when the reheating operation is performed, the water pipe of the hot water supply heat exchanger 3 is heated by the combustion flame of the burner 2, and the water in the water pipe of the hot water supply heat exchanger 3 is contacted with the hot water supply heat exchanger 3 as a heat medium. The water pipe of the reheating heat exchanger 4 is heated and the circulating hot water in the reheating heat exchanger 4 is heated, and the canned and double water bath water heater does not perform the hot water supply operation but only the reheating operation. Since hot water stays in the hot water supply heat exchanger 3 when the solitary operation is performed, the temperature of the accumulated hot water in the hot water heat exchanger 3 rises due to the combustion flame of the burner 2 by the reheating operation. It becomes very hot.
[0019]
For this reason, when hot water supply is started during the reheating single operation or immediately after the renewal single operation is finished, the hot water in the hot water supply heat exchanger 3 heated to a high temperature due to the reheating single operation is discharged. There is a possibility that serious problems such as giving the hot water user discomfort due to hot hot water and causing the hot water user to be burned by the hot water.
[0020]
Therefore, as means for avoiding the above problem, for example, when the bypass valve 16 is opened and the hot water is discharged during the reheating independent operation or immediately after the retreating independent operation is stopped, the hot water flowing out from the hot water supply heat exchanger 3 is used. There has been proposed a means for avoiding the problem of the high temperature hot water by adding water from the bypass passage 15 to lower the hot water temperature of the hot water supply passage 14.
[0021]
However, if the hot water in the hot water supply heat exchanger 3 becomes high due to the reheating independent operation, the high temperature hot water can be prevented even if the water in the bypass passage 15 is added to the hot water in the hot water supply heat exchanger 3. In some cases, the hot water temperature does not drop to the above level, and the problem of the high temperature hot water discharge cannot be avoided. In particular, during the reheating independent operation, the hot water tap (not shown) provided on the outlet side of the hot water supply passage 14 is closed, and the water pressure on the outlet side of the hot water heat exchanger 3 shown in FIG. Is about 3 to 3.5 kg / cm ^2, but when the hot-water tap is opened and hot water supply is started, the water pressure on the outlet side of the hot water heat exchanger 3 decreases to about 2 kg / cm ^2. For this reason, the hot water temperature at the outlet side of the hot water supply heat exchanger 3 may become higher and higher, and may suddenly boil and become steam.
[0022]
Then, even if water in the bypass passage 15 is added to the steam, the steam and water do not mix well, so hot hot water comes out, or water from the bypass passage 15 comes out from the outlet side of the hot water supply passage 14 as it is. As a result, the temperature of the hot water coming out of the hot water supply passage 14 will fluctuate, which is dangerous and makes the user feel very uncomfortable.
[0023]
Therefore, in order to prevent the accumulated hot water of the hot water supply heat exchanger 3 from boiling or becoming close to boiling during the reheating independent operation, for example, the burner 2 is burned intermittently, The combustion capacity has to be set low, and it has been difficult to improve the combustion efficiency of the chasing single operation and shorten the bath boiling time.
[0024]
The present invention has been made in order to solve the above-mentioned problems, and the object thereof is to prevent the hot water supply side hot water discharge and the fluctuation of the hot spring water temperature due to the reheating independent operation, and the reheating operation. An object of the present invention is to provide a single can two water channel bath water heater capable of improving the efficiency of the single operation and shortening the boiling time of the bath.
[0025]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration as means for solving the above problems. That is, according to the first aspect of the present invention, a water supply passage is connected to the inlet side of the hot water heat exchanger, a hot water supply passage is connected to the outlet side of the hot water heat exchanger, and the water supply passage and the hot water passage are connected to the hot water supply passage. It is connected by a bypass passage that bypasses the heat exchanger, and has a reheating heat exchanger that heats the hot water circulating in the recirculation circulation passage that is incorporated in the recirculation circulation passage of the bathtub hot water. The hot water supply unit supplies the hot water produced by the hot water supply heat exchanger through the hot water supply passage, and is provided with a burner that heats the hot water supply heat exchanger and the additional heat exchanger in common. This is a canned and two-way bath water heater having a function and a reheating function for heating the bathtub hot water through the reheating heat exchanger in the recirculation circulation passage and retreating the bath. It said from the side bar The site of the hot water supply passage leading to the connection portion of the path passage and along the water supply passage is disposed, the cooling unit for cooling the water exiting the heated water supply passage portion to which the hot water supply passage along with the hot-water supply heat exchanger It is configured as a feature. In addition, the second aspect of the invention includes the configuration of the first aspect of the invention, and the hot water supply passage portion extending from the outlet side of the hot water heat exchanger to the connection portion with the bypass passage is connected to the bypass passage. It is characterized by being along the passage part of the water supply passage on the downstream side.
[0026]
In the third aspect of the invention, a water supply passage is connected to the inlet side of the hot water heat exchanger, a hot water passage is connected to the outlet side of the hot water heat exchanger, and the water supply passage and the hot water passage are connected to the hot water supply passage. It is connected by a bypass passage that bypasses the heat exchanger, and has a reheating heat exchanger that heats the hot water circulating in the recirculation circulation passage that is incorporated in the recirculation circulation passage of the bathtub hot water. The hot water supply unit supplies the hot water produced by the hot water supply heat exchanger through the hot water supply passage, and is provided with a burner that heats the hot water supply heat exchanger and the additional heat exchanger in common. This is a canned and two-way bath water heater having a function and a reheating function for heating the bathtub hot water through the reheating heat exchanger in the recirculation circulation passage and retreating the bath. It said from the side bypass Characterized in that it placed along a portion of the hot water supply passage leading to the connecting portion between the passage in the bypass passage disposed to form a cooling unit for cooling the water exiting the heat the bypass passage by the hot-water supply heat exchanger It is configured as.
[0027]
Further, according to the fourth aspect of the invention, a water supply passage is connected to the inlet side of the hot water heat exchanger, a hot water passage is connected to the outlet side of the hot water heat exchanger, and the water supply passage and the hot water passage are connected to the hot water supply passage. It is connected by a bypass passage that bypasses the heat exchanger, and has a reheating heat exchanger that heats the hot water circulating in the recirculation circulation passage that is incorporated in the recirculation circulation passage of the bathtub hot water. The hot water supply unit supplies the hot water produced by the hot water supply heat exchanger through the hot water supply passage, and is provided with a burner that heats the hot water supply heat exchanger and the additional heat exchanger in common. This is a canned and two-way bath water heater having a function and a reheating function for heating the bathtub hot water through the reheating heat exchanger in the recirculation circulation passage and retreating the bath. The hot water passage on the side Through the ventilation part wind § down a structure for guiding the connection portion between the bypass passage, as characterized in that form the cooling unit for hot water cooling exiting the heated vent air portion in the hot water supply heat exchanger It is configured.
[0028]
In the present invention configured as described above, the hot water supply passage on the outlet side of the hot water heat exchanger is arranged along the water supply passage in the first invention, and cooling of the hot water heated by the hot water supply heat exchanger is provided in the water supply passage. In the second aspect of the invention, the hot water supply passage is disposed along a bypass passage that bypasses the hot water supply heat exchanger, and the bypass passage forms the cooling portion. Therefore, even if the hot water supply heat exchanger is heated during the reheating independent operation, and the staying hot water in the hot water supply heat exchanger boils or is in a state close to boiling, the hot water supply passage formed in the cooling section In addition, since it is cooled by water passing through the bypass passage and guided to the outlet side of the hot water supply passage, boiling or hot water close to boiling is not discharged from the outlet side of the hot water supply passage, and the possibility of hot hot water supply is avoided.
[0029]
In the third aspect of the invention, the hot water supply passage is led to the hot water outlet side through the air ventilation section of the fan, and this ventilation section forms the cooling section. The hot water in the exchanger is cooled by the wind of the fan and guided to the outlet side of the hot water supply passage, and the possibility of boiling or hot water close to boiling coming out from the outlet side of the hot water passage is avoided.
[0030]
In addition, since the temperature of the hot water in the hot water heat exchanger is lowered by the cooling part in this way, the boiling steam is not passed through the hot water supply passage, and the hot water supply passage bypasses the hot water heat exchanger. Since the water heater is a type of water heater that adds water from the bypass passage to the hot water passing through the hot water passage, water from the bypass passage is not added to the steam. In addition, fluctuations in the temperature of hot water supplied can be avoided.
[0031]
Furthermore, in the present invention having the above-described configuration, as described above, since the hot water passed from the hot water supply heat exchanger to the hot water supply passage is cooled by the cooling unit, as compared with a water heater without a cooling unit, Even if the temperature in the hot water supply heat exchanger is raised during reheating independent operation, the risk of the high temperature hot water can be avoided, so that the efficiency of burner combustion during reheating independent operation can be improved accordingly. As a result, the bath boiling time is shortened, and the above problem is solved.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a system configuration diagram of an embodiment of a single can / two-channel bath water heater according to the present invention. In addition, in the same figure, the same code | symbol is attached | subjected to the same name part as the one can two water channel bath water heater shown in FIG. 4, and the duplication description is abbreviate | omitted. 1 is also provided with the control device 40 and the remote control 41 shown in FIG. 4, but these are omitted in FIG. is there.
[0033]
The one can two water bath hot water heater of this embodiment is configured in substantially the same manner as the one can two water bath hot water shown in FIG. 4, and this embodiment is different from the appliance of FIG. The hot water supply passage 14 on the outlet side of the hot water supply heat exchanger 3 (the passage upstream from the junction 39a with the constant bypass passage 27) is disposed along the water supply passage 13, and this water supply passage 13 is exchanged for hot water supply heat. This is configured as a cooling unit for cooling the hot water heated in the vessel 3. In the present embodiment, as shown in FIG. 1, a passage on the upstream side of the region arranged along the water supply passage 13 of the hot water supply passage 14 is wound around the inner body 29, and this is done. Thus, the hot water passing through the hot water supply passage 14 on the outlet side of the hot water supply heat exchanger 3 is also cooled by the inner body 29.
[0034]
The present embodiment is configured as described above, and this embodiment is also operated by the control device 14 (not shown in FIG. 1) by substantially the same operation as that of the single can two water bath hot water heater shown in FIG. In this embodiment, the hot water supply passage 14 on the outlet side of the hot water heat exchanger 3 extends along the water supply passage 13 according to the control of the hot water supply operation. The hot water heated by the hot water supply heat exchanger 3 is cooled by the heat passing through the water supply passage 13 and is led to the outlet side of the hot water supply passage 14. Therefore, for example, even if the hot water in the hot water supply heat exchanger 3 is heated and boiled during the reheating independent operation, the steam formed by the boiling does not reach the joining portions 39a and 39b of the hot water supply passage 14.
[0035]
And since the hot water cooled by the cooling part is discharged from the outlet side of the hot water supply passage 14 through the hot water supply passage 14, the possibility of the high temperature hot water supply is avoided. Further, if the bypass valve 16 of the bypass passage 15 is opened and the water from the bypass passage 15 is added to the hot water passing through the hot water supply passage 14, the temperature of the hot water can be further lowered. It is possible to avoid the fluctuation of hot water temperature when water is added to the steam, and it is possible to discharge hot water having a substantially stable hot water temperature from the outlet side of the hot water supply passage 14, It can avoid making the user feel uncomfortable.
[0036]
Further, even if the hot water in the hot water supply heat exchanger 3 boils as described above, it is possible to prevent the possibility of high temperature hot water and the fluctuation of the hot water temperature. The stop period can be shortened, and the burner combustion operation can be performed with a high combustion capacity. For this reason, it is possible to improve the combustion efficiency of the chasing single operation, thereby shortening the bath boiling time.
[0037]
In addition, this invention is not limited to the said embodiment example, Various aspects can be taken. For example, in the above embodiment, a part of the hot water supply passage 14 is disposed along the water supply passage 13 and the water supply passage 13 is used as a cooling unit. However, as shown in FIG. May be arranged along the bypass passage 27, and the constant bypass passage 27 may be used as a cooling section. As shown in FIG. 3, a dedicated cooling fan 33 for cooling the hot water passing through the hot water supply passage 14 is provided. The hot water supply passage 14 may be provided to the hot water supply side through the ventilation portion of the cooling fan 33, and the ventilation portion may be the cooling portion. Further, without providing the cooling fan 33, the wind of the combustion fan 7 may be used, and the ventilation portion of the combustion fan 7 may be a cooling unit that cools the hot water supply passage 14.
[0038]
Further, in the above embodiment, the hot water supply passage 14 on the outlet side of the hot water supply heat exchanger 3 is wound around the inner cylinder 29. However, the hot water supply path 14 does not necessarily have to be wound around the inner cylinder 29, and any one of the above What is necessary is just to guide to the hot water side through a cooling part.
[0039]
Further, in the above embodiment, the single can two water bath hot water heater provided with both the bypass passage 27 and the bypass passage 15 is provided. However, the single can two water bath hot water heater of the present invention is always provided with the bypass passage 27. The present invention is also applied to a single can two-way bath water heater of a type that is not provided or a type that is not provided with the bypass passage 15, and the present invention has one bypass passage having a hot water supply function and a reheating function. It is widely applied to can two waterway bath water heaters.
[0040]
【The invention's effect】
According to the invention, arranged and along a portion of the hot water supply passage extending from the outlet side of the hot-water supply heat exchanger to the connection portion between the bypass passage to the water supply passage and exits the heated water supply passage with the hot water supply heat exchanger or forms a cooling unit for hot water cooling, the site of a hot water supply passage leading to the connecting portion between the bypass passage from the outlet side of the hot water supply passage, wherein the bypass passage and arranged along a said bypass passage cooling A hot water supply passage on the outlet side of the hot water heat exchanger is guided to a connection portion with the bypass passage through a fan air ventilation portion, and the ventilation portion is formed with the cooling portion. Therefore, even if the accumulated hot water in the hot water heat exchanger becomes boiling or near boiling during the reheating independent operation, the temperature of the steam or hot water generated by boiling is reduced by the cooling unit. Can be lowered and discharged from the outlet side of the hot water passage It can be avoided the risk of high-temperature hot water.
[0041]
Further, a water supply passage and hot water supply passage have a bypass passage is provided for connecting communicating, because as one can of two waterways water heater of a type that tapping by adding water from the bypass passage to the hot water through the hot water supply passage, for example, When the hot water stays in the hot water heat exchanger boils and becomes steam due to the independent operation of the bath and reaches the junction with the bypass passage of the hot water passage, the water temperature is reduced by adding water from the bypass passage to the steam. However, according to the present invention, the steam does not reach the merging section as it is, and the hot water whose temperature has been lowered by the cooling section reaches the merging section. By adding this water, it is possible to more reliably avoid the possibility of high temperature hot water and to stabilize the hot water temperature, thereby avoiding making the user feel uncomfortable.
[0042]
In addition, as described above, even if the hot water in the hot water heat exchanger boils during the reheating independent operation, it is possible to avoid the possibility of high temperature hot water on the hot water supply side or the fluctuation of the hot water temperature. It is possible to improve the efficiency of the solitary operation, and it is possible to shorten the bath boiling time.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram showing an embodiment of a single-can two-water bath water heater according to the present invention.
FIG. 2 is an explanatory diagram showing a cooling unit configuration of another embodiment of a single can / two water bath hot water heater according to the present invention.
FIG. 3 is an explanatory diagram showing a cooling unit configuration of still another embodiment of the single can / two water bath hot water heater according to the present invention.
FIG. 4 is a system configuration diagram showing a model example of a single can / two water bath hot water heater.
[Explanation of symbols]
1 Combustion chamber 2 Burner 3 Hot water supply heat exchanger 4 Reheating heat exchanger 7 Combustion fan 13 Water supply passage 14 Hot water supply passage 24 Reheating circulation passage 33 Cooling fan

Claims (4)

A hot water supply passage is connected to the inlet side of the hot water heat exchanger, a hot water supply passage is connected to the outlet side of the hot water heat exchanger, and the hot water passage and the hot water passage are bypassed by a bypass passage that bypasses the hot water heat exchanger. are connected in communication with, incorporated into bath of hot water reheating circulation passage has a reheating heat exchanger for heating the hot water circulating the reheating circulation passage, the hot water supply heat exchanger Reheating heat exchanger integrally The hot water supply heat exchanger and the reheating heat exchanger are provided with a burner that heats the hot water supply heat exchanger and the reheating heat exchanger in common. A one-can two-water bath water heater having a reheating function that heats through a recirculation passage heat exchanger and retreats a bath, and is connected to the bypass passage from the outlet side of the hot water heat exchanger leading to the And a portion of the hot water passage and along the water supply passage is disposed, characterized in that form the cooling unit for cooling the water exiting the heated water supply passage portion in which the hot water supply passage along with the hot-water supply heat exchanger One can two water bath hot water heater. 2. The hot water supply passage portion extending from the outlet side of the hot water supply heat exchanger to the connection portion with the bypass passage is arranged along the passage portion of the water supply passage downstream of the connection portion with the bypass passage. One can two water bath hot water heater. A hot water supply passage is connected to the inlet side of the hot water heat exchanger, a hot water supply passage is connected to the outlet side of the hot water heat exchanger, and the hot water passage and the hot water passage are bypassed by a bypass passage that bypasses the hot water heat exchanger. The hot water supply heat exchanger and the reheating heat exchanger are integrated with each other and have a reheating heat exchanger that heats the hot water circulating in the recirculation circulation passage and is incorporated in the recirculation circulation passage of the bathtub hot water. The hot water supply heat exchanger and the reheating heat exchanger are provided with a burner that heats the hot water supply heat exchanger and the reheating heat exchanger in common. A one-can two-water bath water heater having a reheating function that heats through a recirculation passage heat exchanger and retreats a bath, and is connected to the bypass passage from the outlet side of the hot water heat exchanger leading to the And a portion of the hot water passage along a said bypass passage is disposed, a can two waterways bath, characterized in that form the cooling unit for cooling the water exiting the heat the bypass passage by the hot-water supply heat exchanger Water heater. A hot water supply passage is connected to the inlet side of the hot water heat exchanger, a hot water supply passage is connected to the outlet side of the hot water heat exchanger, and the hot water passage and the hot water passage are bypassed by a bypass passage that bypasses the hot water heat exchanger. are connected in communication with, incorporated into bath of hot water reheating circulation passage has a reheating heat exchanger for heating the hot water circulating the reheating circulation passage, the hot water supply heat exchanger Reheating heat exchanger integrally The hot water supply heat exchanger and the reheating heat exchanger are provided with a burner that heats the hot water supply heat exchanger and the reheating heat exchanger in common. A one-can two-water bath water heater having a reheating function that heats through a recirculation passage heat exchanger and retreats a bath, wherein the hot water passage on the outlet side of the hot water heat exchanger is connected to the Through the ventilation section Wherein a structure for guiding the connection portion of the bypass passage, a can two waterways bath water heater, characterized in that it forms a cooling portion for cooling of the hot water exiting the heated vent air portion in the hot water supply heat exchanger.

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