JP3798123B2 - One can two water channel type water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a single-can two-water channel type hot water supply apparatus having two functions of hot water supply and memorial service.
[0002]
[Prior art]
In general, a conventional canned two-water channel type hot water supply apparatus includes one heat exchanger, a hot water supply pipe and an additional pipe provided in the heat exchanger, and a gas burner (heat generation unit) for heating the heat exchanger. have. When the hot water tap is opened at the time of hot water supply, the water supplied to the hot water supply pipe is heated in the heat exchanger and discharged from the hot water tap. Moreover, at the time of remedy, when the pump provided in the remedy pipe is started, the hot water in the bathtub circulates through the remedy pipe and is heated in the heat exchanger and returned to the bathtub.
[0003]
By the way, in the one-pipe two-water channel type hot water supply apparatus, since the hot water supply pipe and the remedy pipe are provided in one heat exchanger, the hot water in the remedy pipe is also heated during the hot water supply operation. The water supply in the hot water supply pipe is also heated. In particular, in the case of a shape like the heat exchanger shown in FIG. 5, that is, in the case where the remedy water pipe 21 which is a part of the remedy pipe is arranged on the hot water pipe 11 which is a part of the hot water pipe. During the chasing operation, the hot water supply pipe 11 is first heated by a gas burner (not shown), and the hot water in the chasing water pipe 21 is indirectly heated by using the hot water in the hot water supply pipe 11 as a heat medium. Of course, the hot water in the memorial water pipe 21 is also heated directly. Here, since the hot water supply pipe 11 is arranged closer to the gas burner than the remedy water pipe 21, the hot water in the hot water supply pipe 11 is taken away by heating the hot water in the remedy water pipe 21. If the amount of heat received from the gas burner by the water supply in the hot water supply pipe 11 is greater than the amount of heat generated, the water may boil during the memorial operation.
[0004]
In order to prevent boiling of the feed water during the memorial operation, in the conventional one-can two-water channel hot water supply apparatus, the memorial stop temperature T _OFF and the memorial resumption temperature T _ON (<T _OFF ) are set in advance. In addition, when the temperature of the water supply in the hot water supply pipe reaches the renewal stop temperature T _OFF , the refueling combustion of the gas burner is temporarily stopped, and then the gas burner is combusted again when the water supply temperature becomes lower than the resumption resumption temperature T _ON. Yes. Then, the combustion stop and the combustion restart of the gas burner are repeated until the temperature of the hot water in the bathtub reaches a desired temperature.
[0005]
[Problems to be solved by the invention]
As shown in FIG. 6, the boiling temperature of the feed water varies depending on the pressure. When the feed water pressure decreases, the boiling temperature of the feed water also decreases accordingly. For this reason, if additional combustion is performed in a state where the supply water pressure is low, the supply water may boil before reaching the additional stop temperature T _OFF .
[0006]
Of course, if the memory stop temperature T _OFF is set to a low value in advance, the water supply can be prevented from boiling. However, if the remedy stop temperature T _OFF is set low, when the feed water pressure is high, combustion is stopped at a low temperature at which there is no fear of boiling, resulting in frequent combustion cessation. Will fall.
[0007]
[Means for Solving the Problems]
In order to solve the above problem, the invention according to claim 1 is directed to a hot water supply pipe and a remedy pipe provided in one heat exchanger, a heat generation unit for heating the heat exchanger, and during the remedy. In a one-can two-water channel hot water supply apparatus having a control unit that stops heating by the heat generation unit when the water temperature in the hot water supply tube reaches a predetermined renewal stop temperature, the pressure of the supply water supplied to the hot water supply pipe is A water supply pressure detecting means for detecting and a stop temperature determining means for determining the tracking stop temperature based on a pressure detected by the water supply pressure detecting means are provided.
[0008]
In this case, in the hot water supply pipe between the water supply pressure detecting means and the heat exchanger, the flow of water supply from the upstream side to the downstream side is allowed, and the flow of water supply from the downstream side to the upstream side is blocked. It is desirable to provide a stop valve.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 shows a schematic configuration of a single can two-water channel hot water supply apparatus according to the present invention. This hot water supply apparatus includes one can (not shown) and a gas burner (heat) accommodated in a lower portion of the can. Generator 1, a heat exchanger 2 housed in the upper portion of the can, and a fan (not shown) for supplying combustion air to the gas burner 1. The means for supplying gas to the burner 1 has a gas pipe 3 and a main electromagnetic on-off valve 4 and an electromagnetic proportional valve 5 provided on the gas pipe 3 respectively. An ignition mechanism (not shown) is disposed in the vicinity of the burner 1.
[0012]
The gas burner 1 and the heat exchanger 2 are used in common for both the hot water supply pipe 10 and the remedy pipe 20. That is, the heat exchanger 2 includes a large number of thin fin plates 2 a, and the fin plate 2 a has a hot water supply pipe 11 that is a part of the hot water supply pipe 10 and a memorial service that is a part of the memorial pipe 20. The water pipes 21 are arranged in a penetrating state. As shown in FIG. 5, the hot water supply pipe 11 penetrates the lower part of the fin plate 2a a plurality of times and then penetrates the upper part of the fin plate 2a a plurality of times. It arrange | positions so that the upper surface may be contacted along the lower part of the hot water supply pipe 11. Of course, other known arrangements may be employed.
[0013]
A water supply pipe 12 is connected to the inlet end of the hot water supply pipe 11, and a hot water discharge pipe 13 is connected to the outlet end. A hot water supply pipe 10 is constituted by the hot water supply water pipe 11, the water supply pipe 12 and the hot water supply pipe 13. A hot-water tap 14 is provided at the end of the hot water discharge pipe 13. In addition, two bypass pipes 15 and 16 are provided in parallel with the hot water supply pipe 11 between the water supply pipe 12 and the hot water supply pipe 13. In FIG. 1, connection points between the bypass pipe 15 and the water supply pipe 12 and the hot water discharge pipe 13 are indicated by reference numerals P1 and P2, respectively. Connection points between the bypass pipe 16 and the water supply pipe 12 and the hot water supply pipe 13 are indicated by reference numerals P3 and P4. Each is shown.
[0014]
The bypass pipe 15 closer to the heat exchanger 2 is not provided with a valve or the like, and the supply water flowing through the water supply pipe 12 is always at a constant ratio between the hot water supply pipe 11 side and the bypass pipe 12 side at the connection point P1. (For example, 70:30). And it merges again in the connection point P2.
[0015]
On the other hand, the bypass pipe 16 far from the heat exchanger 2 is provided with a flow control valve GM2. As the flow control valve GM2, for example, a gear motor driven type configured as follows is used. That is, a gear motor-driven flow control valve includes an annular valve seat provided in a pipe, a valve body movable with respect to the valve seat, a shaft having one end fixed to the valve body, and the shaft And a motor connected to the other end portion via a reduction gear train. The shaft is screwed into the valve case. Therefore, when the motor rotates, the shaft moves in the axial direction, thereby changing the opening between the valve body and the valve seat. Therefore, the ratio of the amount of water flowing from the connection point P3 to the hot water supply pipe 11 side and the amount of water flowing to the bypass pipe 16 side can be appropriately changed. In addition, the flow control valve GM1 comprised similarly to the flow control valve GM2 is provided also in the hot water discharge pipe 13 between the connection points P2 and P4.
[0016]
The hot water supply pipe 10 is provided with first and second flow sensors FL1, FL2. The first flow sensor FL1 is disposed in the water supply pipe 12 between the connection points P1 and P3, and the second flow sensor FL2 is disposed in the hot water discharge pipe 13 between the connection point P4 and the hot water tap 14. Yes.
[0017]
The hot water supply pipe 10 is provided with four temperature sensors TH _IN , TH _Z , TH _OUT , and TH _MIX . The temperature sensor TH _IN is disposed in the water supply pipe 12 upstream from the connection point P3, and detects the water supply temperature. The temperature sensor TH _Z is disposed in the bend portion of the hot water supply pipe 11 and detects the temperature of the water in the hot water supply pipe 11. The temperature sensor TH _OUT is arranged in the hot water discharge pipe 13 near the outlet of the hot water supply water pipe 11 and detects the temperature of the hot water coming out of the hot water supply water pipe 11. The temperature sensor TH _MIX is disposed in the hot water discharge pipe 13 on the downstream side from the connection point P4 and detects the temperature of the hot water discharged from the water tap 14.
[0018]
On the other hand, in the remedy pipe 20, a return pipe 22 is connected between the inlet end of the remedy water pipe 21 and the bathtub 6, and an outgoing path is connected between the outlet end of the remedy water pipe 21 and the bathtub 6. A tube 23 is connected. A memorial pipe 20 is constituted by the memorial water pipe 21, the return pipe 22, and the forward pipe 23. The return pipe 22 is provided with a pump 24, a temperature sensor TH _HR, and a flowing water switch FS. The temperature sensor TH _HR detects the temperature of hot water (or water) flowing into the return pipe 22 from the bathtub 6. Therefore, the temperature sensor TH _HR substantially detects the temperature of hot water in the bathtub 6. The flowing water switch FS is for detecting whether or not hot water is flowing in the return pipe 22, and is turned on when hot water is flowing in the return pipe 22 and is not flowing. Is turned off. When the running water switch FS is in an OFF state, the burner 1 is not ignited even if a follow-up switch described later is turned on.
[0019]
Between the outlet pipe 13 of the hot water supply pipe 10 and the return pipe 22 of the memorial pipe 20, a pouring pipe 30 for filling the bathtub 6 is provided. The pouring pipe 30 and the outlet pipe 13 are provided. Each connection point with the return pipe 22 is indicated by reference numerals P5 and P6. The pouring pipe 30 is provided with a pouring valve 31 composed of an electromagnetic on-off valve.
[0020]
The hot water supply apparatus further includes a control unit (control unit) 50 and a remote controller 60. The control unit 50 receives detection signals from various detection means. Here, detection signals from temperature sensors TH _IN , TH _Z , TH _OUT , TH _MIX , TH _{H R} , flow sensors FL 1, FL 2 and flowing water switch FS are inputted. In the following, the same reference numerals as those of the detection means are used for the detection signals of the detection means. The control unit 50 controls the main electromagnetic on-off valve 4 and the electromagnetic proportional valve 5 of the gas supply means, the ignition mechanism, the fan, the flow rate control valves GM ₁ and GM ₂ , the pump 24 and the pouring valve 31 based on each detection signal. To do. On the other hand, the remote controller 60 includes an operation switch, a bath automatic operation switch, a memory switch, a temperature setting unit, and a display unit (none of which are shown). While outputting to the control unit 50, this information is displayed on a display part. As will be described later, the display unit also displays error information from the control unit 50.
[0021]
In the case of performing hot water supply, chasing and automatic hot water filling using the hot water supply apparatus having the above configuration, when hot water supply is performed first, the operation switch of the remote controller 60 is turned on and the hot water tap 14 is opened. Then, the control unit 50 ignites the gas burner 1 and also controls the electromagnetic proportional control valve based on the set temperature, the water supply amount FL1 of the water supplied to the water supply pipe 12, the water supply temperature TH _IN , the hot water temperature TH _OUT and the hot water supply amount FL2. 5 and flow control valves GM1 and GM2 are controlled. Thereby, hot water having a temperature equal to the set temperature is discharged from the hot-water tap 14.
The control of the electromagnetic proportional control valve 5 and the like is the same as that of the conventional one and is not a main part of the present invention, and therefore detailed description thereof is omitted. The same applies to the following memorial service and automatic hot water filling. Further, when there is a difference between the water supply amount FL1 and the hot water supply amount FL2 that is greater than or equal to a predetermined magnitude, it is assumed that there is a water leak in the piping, and the combustion of the gas burner 1 is stopped and the display unit displays an error. .
[0022]
When performing the tracking, the tracking switch of the remote controller 60 is turned on. Then, first, the pump 24 is activated, and the hot water in the bathtub 6 circulates through the return pipe 22 and the forward pipe 23. When the flowing water switch FS detects the flow of hot water in the return pipe 22, the gas burner 1 is ignited. Thereby, the hot water in the bathtub 6 is heated. When the detection signal from the temperature sensor TH _HR reaches the set temperature, the combustion of the gas burner 1 is automatically stopped and the pump 24 is stopped.
[0023]
When performing automatic hot water filling, the bath automatic operation switch of the remote controller 60 is turned ON. Then, the gas burner 1 is ignited, the pouring valve 31 is opened, and hot water heated in the hot water supply water pipe 11 passes through the pouring pipe 30 and is supplied to the bathtub 6 through the return pipe 22 and the forward pipe 23. The Of course, it is controlled by the control unit 50 so that the temperature of the hot water supplied to the bathtub 6 becomes the set temperature. When a predetermined amount of hot water accumulates in the bathtub 6, the pouring valve 31 is closed based on a detection signal from a detection means (not shown) for detecting the water amount in the bathtub 6, and combustion of the gas burner 1 is stopped. The hot water filling is finished.
[0024]
Here, in this hot water supply apparatus, in order to prevent boiling of the hot water in the hot water supply pipe 11 during the chasing operation, the temperature detected by the temperature sensor TH _OUT (hereinafter referred to as hot water temperature) TH _OUT is used as a reference additional. When the _soot stop temperature T _OFF0 is reached, the combustion (additional combustion) of the gas burner 1 is temporarily stopped. Reference additionally fired stop temperature T _OFF0, in case the pressure of the feed water is a predetermined reference sheet pressure ^{A (≧ 1Kg / cm 2)} , when the hot water temperature TH _OUT becomes reference additionally fired stop temperature T _OFF0, hot water pipe 11 is set to such a temperature that the water supply in 11 does not boil. In this embodiment, when the reference feed water pressure A is 1 kg / cm ² , the reference additional combustion stop temperature T _OFF is set to 70 ° C.
[0025]
On the other hand, the supply water in the hot water supply pipe 11 is not received heat by the combustion due to the temporary stop of the additional combustion, while the heat is continuously released from the hot water in the additional water pipe 21 and the temperature of the hot water supply TH is decreased. _{When OUT} reaches a predetermined resumption temperature T _ON (<T _OFF ), the combustion of the gas burner 1 is resumed. When the detection signal from the temperature sensor TH _HR reaches the set temperature TH ₀ while repeating the stop and restart of the combustion of the gas burner 1, the combustion of the gas burner 1 is automatically stopped and the pump 24 is stopped. .
[0026]
By the way, since the reference chase stop temperature T _OFF0 is determined based on a predetermined set water supply pressure A, when the actual pressure of the water supplied to the water supply pipe 12 is lower than the set water supply pressure A, the tapping temperature There is a possibility that the water supply in the hot water supply pipe 11 will boil before TH _OUT becomes the reference tracking stop tracking _TOFF0 .
In addition, when the reference chasing stop temperature T _OFF0 and the chasing resumption temperature T _ON are measured not by the temperature sensor TH _OUT but by the temperature sensor TH _IN ′ arranged at the inlet of the hot water supply pipe 11 or the temperature sensor TH _Z , When boiling occurs, the hot water coming out of the hot water supply pipe 11 and the water in the water supply pipe 12 are mixed, and the temperature is rapidly lowered to become the resumption temperature T _ON or less, so that the combustion is restarted again. That is, the resumption of combustion that should be performed by heat radiation to the hot water in the main body water purging water pipe 21 is performed by mixing with the water in the water supply pipe 12 due to boiling.
[0027]
In order to prevent such a problem, in this hot water supply apparatus, a check valve V is provided in the water supply pipe 12 arranged on the upstream side of the heat exchanger 2. In particular, in this embodiment, the check valve V is arranged between the connection point P3 and the temperature sensor TH _IN. The check valve V allows the flow of water supply from the upstream side to the downstream side, but prevents the flow of water supply from the downstream side to the upstream side, and has such a function. If it is, the structure is arbitrary.
[0028]
In the hot water supply apparatus configured as described above, when the hot water tap 14 is closed, water in the hot water supply pipe 10 is confined between the check valve V and the hot water tap 14. Therefore, when the water supply in the hot water supply pipe 11 is heated and expanded during the chasing operation, the pressure in the hot water supply pipe 10 increases. As a result, even if the pressure of the feed water supplied to the hot water supply pipe 10 is lower than the reference feed water pressure A, if the feed water in the hot water supply pipe 11 is heated by the additional combustion, the pressure becomes higher than the reference feed water pressure A. . Therefore, it is possible to prevent boiling water in the hot water supply pipe 11 from boiling before the hot water temperature TH _OUT reaches the reference tracking stop temperature T _OFF0 .
[0029]
Next, another embodiment of the present invention will be described.
Water heater of the embodiment shown in FIG. 2, instead of the check valve V, having thereon a pressure sensor P _S for measuring the pressure of the feed water supplied to the hot water supply pipe 10, the pressure sensor P _S Is arranged between the temperature sensor TH _IN and the connection point P3. The detection signal of the pressure sensor P _S is sent to the control unit 50. The control unit 50 is configured to determine the add-fired stop temperature T _OFF during add-fired operation based on the output signal of the pressure sensor P _S, the hot water temperature TH _OUT is additionally fired stop temperature T _OFF, temporarily add焚燃ware It is supposed to stop.
[0030]
Such additional combustion control is executed based on the flowchart shown in FIG. That is, when there is additionally焚指Ordinance detection signal serving reading of supply pressure P _S of the pressure sensor P _S is performed first in step S1. Next, in step S2, additionally fired stop temperature T _OFF and Tsui焚restart temperature T _ON (<T _OFF) is determined based on the water supply pressure P _S.
[0031]
The tracking stop temperature T _OFF is not constant and differs from the reference tracking stop temperature T _OFF0 of the above embodiment in that it is determined according to the feed water pressure P _S. Similarly to the _soot stop temperature T _OFF0 , the combustion of the gas burner 1 is stopped when the tapping temperature TH _OUT reaches the supplementary stop temperature T _OFF . Additionally fired stop temperature T _OFF, the reference feed water pressure P ₀ and the reference OFF temperature T ₀ determined in advance and the actual supply pressure P _S and the reference supply pressure P ₀ reference additionally fired stopped based on the difference between the temperature T ₀ it may be corrected, or water supply pressure P _S and Tsui焚advance to create a map representing the relationship between stop temperature T _OFF in advance, may be selected from the map.
[0032]
On the other hand, it is desirable that the resumption temperature T _ON is determined so as to always have a constant temperature difference with respect to the renewal stop temperature T _OFF , but may be constant. However, even in the case of making it constant, it is a matter of course that T _ON <T _OFF must be satisfied.
[0033]
Next, in step S3, the gas burner 1 is ignited and additional combustion starts. After the start of additional combustion, it is determined in step S4 whether or not the hot water temperature TH _HR of the bathtub 6 is _{equal to} or higher than the set temperature T _H0 . When TH _HR ≧ T _H0 , the temperature of the hot water in the bathtub 6 has reached the desired set temperature, so in step S5, the combustion of the gas burner 1 and the pump 24 are stopped, and the combustion combustion ends. On the other hand, if TH _HR <T _H0 , the process proceeds to step S6.
[0034]
In step S6, it is determined whether or not the tapping temperature TH _OUT is equal to or higher than the renewal stop temperature T _OFF . If TH _OUT <T _H0 , additional combustion is continued and the process returns to step S4. When TH _HR ≧ T _H0 , after the combustion of the gas burner 1 is stopped in step S7, the process proceeds to step S8. The operation of the pump 24 is continued.
[0035]
In step S8, it is determined whether or not the tapping temperature TH _OUT is equal to or lower than the reheating temperature T _ON . If TH _OUT ≦ T _ON , the process returns to step S3, the combustion of the gas burner 1 is resumed, and steps S3 to S8 are repeated. On the other hand, if TH _OUT > T _ON , the process proceeds to step S9.
[0036]
In step S9, whether or not the temperature TH _HR bathtub hot water set temperature TH ₀ or more is determined. If TH _HR ≧ TH ₀ , the pump 24 is stopped in step S10, and the combustion combustion ends. The reason for making the determination in S9 after the combustion of the gas burner 1 is stopped is that the heat exchanger 2, the hot water supply pipe 11 and the heat source pipe 21 are heated by the heat held in the water supply therein, and the combustion of the gas burner 1 is performed. This is because the temperature of the hot water in the bathtub 6 may rise to the set temperature TH ₀ even after the stop. On the other hand, if TH _HR <TH ₀ , the process returns to step S8. That is, it waits until the hot water temperature TH _OUT decreases to the memorial resumption temperature T _ON . When TH _OUT ≦ T _ON , step S3 and subsequent steps are repeated until TH _HR ≧ TH ₀ is satisfied.
[0037]
In the hot water supply apparatus, since the decision on the basis of the additionally-fired stop temperature T _OFF to supply water pressure P _S, prevents water in the water supply pressure P always hot water pipe regardless of the size of _S 11 that boils can do. Moreover, when the water supply pressure P _S is high, because it additionally fired stop temperature T _OFF in accordance with it is set high, never burn stopping the gas burner 1 is frequently performed. Therefore, the memorial efficiency can be improved.
[0038]
3 is a combination of the embodiment shown in FIG. 1 and the embodiment shown in FIG. 2, and includes a check valve V and a pressure sensor P _{S in the} water supply pipe 12. And are provided respectively. The check valve V is disposed on the downstream side of the pressure sensor P _S. Other configurations are the same as those of the embodiment shown in FIG.
[0039]
In the hot water supply apparatus of this embodiment, it is possible to prevent boiling of the hot water in the hot water supply pipe 11 when the hot water tap 14 is opened during chasing or immediately after chasing.
That is, in the embodiment shown in FIG. 1, the pressure of the water supply in the hot water supply pipe 11 rises during the chasing and becomes higher than the pressure of the water supply supplied to the water supply pipe 12 (hereinafter referred to as the original pressure). There is. For this reason, if the hot-water tap 14 is opened during or after the chasing, the pressure in the hot-water supply pipe 11 is rapidly reduced to the original pressure. As a result, the water supply in the hot water supply pipe 11 may boil.
[0040]
In this regard, the hot water supply device of this embodiment, since the set resume stop temperature T _OFF based on the original pressure (supply water pressure) P _S, the temperature of the feed water of hot water pipe 11 is in the original pressure P _S When the boiling point is not reached. Therefore, even if the hot-water tap 14 is opened during the chasing or immediately after the stop, it is possible to prevent boiling of the water in the hot water supply pipe 11.
[0041]
In addition, this invention is not limited to said embodiment, It can change suitably.
For example, in the embodiment shown in FIG. 2, once the tracking stop temperature T _OFF and the tracking restart temperature T _ON are determined after the start of the tracking, they are used until the tracking is completed. also constantly monitors the source pressure P _S in, may be changed additionally fired stop temperature T _OFF and additionally fired restart temperature T _oN accordingly.
[0042]
Further, in the above embodiment, although detecting the pressure of the feed water supplied to the hot water supply pipe by the pressure sensor P _S provided on the water supply pipe 12, for example, the opening degree of the hot-water tap 14, the opening At this time, the water supply pressure is calculated based on the flow rate of the water supply flowing through the hot water supply pipe 10, and the calculation result is stored in the control unit 50. Then, the OFF temperature and the ON temperature may be determined based on the stored water supply pressure. In that case, it is desirable to calculate and store the feed water pressure each time the hot water tap 14 is opened.
[0043]
Furthermore, in the above embodiment, the temperature of the hot water supply pipe 11 is indirectly detected by detecting the hot water temperature TH _OUT , but the temperature sensor TH _Z is used to detect the temperature of the hot water supply pipe 11. You may make it detect directly.
[0044]
【The invention's effect】
As described above, according to the first aspect of the invention, the hot water in the hot water supply pipe can be prevented from boiling during the chasing, and the merit efficiency can be improved. .
According to the second aspect of the invention, in addition to the effect of the first aspect, when the hot water tap is opened during or after the chasing, it is possible to prevent boiling of the hot water in the hot water pipe. can get.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of an embodiment of the present invention.
FIG. 2 is a diagram showing a main part of another embodiment of the present invention. FIG. 3 is a diagram showing a main part of still another embodiment of the present invention.
4 is a view showing a flowchart for additional combustion according to the embodiment shown in FIG. 2; FIG.
FIG. 5 is a view showing the arrangement of hot water supply pipes and additional water pipes in the heat exchanger according to the present invention.
FIG. 6 is a diagram showing a relationship between feed water pressure and boiling temperature.
[Explanation of symbols]
V check valve P _S Pressure sensor (supply water pressure detecting means)
1 Gas burner (heat generating part)
2 Heat exchanger 10 Hot water supply pipe 20 Mourning pipe 50 Control unit (control unit)

Claims (2)

A hot water supply pipe and a reheating pipe provided in one heat exchanger, a heat generating part for heating the heat exchanger, and the heat when the water temperature in the hot water supply pipe reaches a predetermined renewal stop temperature during the reheating In a single can two-water channel hot water supply apparatus provided with a control unit for stopping heating by the generating unit, a water supply pressure detecting means for detecting the pressure of the water supplied to the hot water supply pipe, and a detected pressure by the water supply pressure detecting means One can two water channel type hot water supply apparatus, characterized in that a stop temperature determining means for determining the renewal stop temperature is provided. The hot water supply pipe between the water supply pressure detecting means and the heat exchanger is provided with a check valve that allows the flow of water supply from the upstream side to the downstream side and prevents the flow of water supply from the downstream side to the upstream side. a can two conduit-type water heater according to claim 1, characterized in that provided.

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