JP2024068949A - Stationary type water heater - Google Patents

Abstract

To prevent wobble of a detection temperature of a hot water tapping thermistor.SOLUTION: A stationary type water heater 1 is the stationary type water heater 1 which is placed on a placement surface and includes: a housing H having a pair of side plates HA, HB; a heat exchanger disposed inside the housing H, and having an outlet part 32 where heated water flows out; a hot water tapping pipe 27 extending toward one side plate HA from the outlet part 32 of the heat exchanger; a fixing tool 70 for connecting a downstream end part of the hot water tapping pipe 27 to a hot water tapping port 72 provided at the one side plate HA; a by-pass pipe 30 connected to the hot water tapping pipe 27, and for allowing water to flow in a hot water tapping path OR of the hot water tapping pipe 27; and a hot water tapping thermistor provided on the downstream end part of the hot water tapping pipe 27, and for detecting a temperature. The hot water tapping path OR of the hot water tapping pipe 27 is further on the downstream side of a connection point 33 with the by-pass pipe 30, and includes a detour path DR formed so as to detour a structure disposed inside the housing H.SELECTED DRAWING: Figure 1

Description

This disclosure relates to a free-standing water heater.

As a hanging-fixed water heater that is fixed to a wall, for example, the water heater described in JP 2021-55889 A (Patent Document 1 below) is known. This water heater is equipped with a primary heat exchanger in which a hot water supply primary heat exchanger and a bath primary heat exchanger are arranged side by side with a partition part interposed. The hot water supply primary heat exchanger is equipped with a series of heat transfer piping formed in a serpentine shape, and this heat transfer piping is equipped with heat transfer tubes that extend in the front-rear direction and are arranged in the left-right direction, and a U-shaped connecting pipe that connects the heat transfer tubes to each other. Of the multiple heat transfer tubes, the rear end of the heat transfer tube farthest from the partition part is the hot water supply inlet opening, and the front end of the heat transfer tube closest to the partition part is the hot water supply outlet opening. The base end of the hot water outlet pipe is connected to this hot water supply outlet opening, and this hot water outlet pipe inclines downward to the right side and merges with the bypass pipe, then extends downward near the right side plate in the housing and is fixed to the bottom plate of the housing. A hot water outlet temperature thermistor is provided at the downstream end of the hot water outlet pipe, and the water heater is equipped with a controller that performs combustion control based on the detected temperature, etc., detected by this hot water outlet temperature thermistor.

On the other hand, freestanding water heaters that are placed on a support surface such as the floor are also available. Because freestanding water heaters are used by placing them on a support surface, the tap and other connectors are fixed to the side panels of the housing, not the bottom panel.

JP 2021-55889 A

However, in the case of freestanding water heaters, the length of the hot water outlet pipe is extremely short compared to that of a suspended fixed type. This means that the distance from the junction with the bypass pipe to the connector is too short, and the water from the bypass cannot be mixed sufficiently inside the hot water outlet pipe. As a result, the temperature detected by the hot water outlet temperature thermistor fluctuates, which can cause the combustion control to become unstable.

The freestanding water heater of the present disclosure is a freestanding water heater that is placed on a placement surface and includes a housing having a pair of side panels, a heat exchanger disposed inside the housing and having an outlet from which heated water flows out, a hot water outlet pipe extending from the outlet of the heat exchanger toward one of the side panels, a fixture connecting the downstream end of the hot water outlet pipe to a hot water outlet provided on one of the side panels, a bypass pipe connected to the hot water outlet pipe and allowing water to flow into the hot water outlet path of the hot water outlet pipe, and a hot water outlet thermistor provided at the downstream end of the hot water outlet pipe for detecting temperature, and the hot water outlet path of the hot water outlet pipe includes a bypass path downstream of the connection point with the bypass pipe and formed to bypass a structure disposed inside the housing.

This disclosure makes it possible to prevent fluctuations in the temperature detected by the hot water outlet thermistor.

FIG. 1 is a front view of a water heater according to an embodiment. FIG. 2 is an enlarged front view of the water heater showing the configuration around the hot water outlet pipe. FIG. 3 is a front view of the piping and surrounding area. FIG. 4 is a perspective view of the tap hole as seen diagonally from above on the left. FIG. 5 is a perspective view of the bypass pipe as viewed from diagonally below on the right. FIG. 6 is a schematic circuit diagram of a water heater according to an embodiment.

[Description of the embodiments of the present disclosure]
First, embodiments of the present disclosure will be listed and described.
(1) The free-standing water heater of the present disclosure is a free-standing water heater placed on a mounting surface, and includes a housing having a pair of side panels, a heat exchanger arranged inside the housing and having an outlet portion from which heated water flows out, a hot water outlet pipe extending from the outlet portion of the heat exchanger toward one of the side panels, a fixing device connecting the downstream end of the hot water outlet pipe to a hot water outlet provided on one of the side panels, a bypass pipe connected to the hot water outlet pipe and allowing water to flow into the hot water outlet path of the hot water outlet pipe, and a hot water outlet thermistor provided at the downstream end of the hot water outlet pipe for detecting temperature, wherein the hot water outlet path of the hot water outlet pipe has a bypass path downstream of the connection point with the bypass pipe and formed to bypass a structure arranged inside the housing.

The hot water outlet path is a detour downstream of the connection point with the bypass pipe, so a long distance can be secured between the connection point with the bypass pipe and the fixture. Therefore, even when a common heat exchanger is used, the water from the bypass pipe can be mixed sufficiently within the hot water outlet path. This prevents the temperature detected by the hot water outlet thermistor from fluctuating.

(2) It is preferable that the outlet pipe includes a downflow pipe section descending from the outlet portion of the heat exchanger toward one of the side plates, a connecting pipe section extending horizontally from the downstream end of the downflow pipe section, and an upflow pipe section extending upward from the downstream end of the connecting pipe section, and that the connecting pipe section is provided with a connection point with the bypass pipe.
Since the connecting pipe section is located lower than the downflow pipe section and the upflow pipe section, when the drain plug provided on the fixing device is removed, the hot water in the downflow pipe section and the upflow pipe section can be easily drained outside the water heater through the bypass pipe.

(3) It is preferable that the riser pipe section extends toward a surplus space formed between the heat exchanger and one of the side plates, and the outlet pipe comprises a first extension pipe extending from the upper end of the riser pipe section toward one of the side plates within the surplus space, and a second extension pipe extending downward from the downstream end of the first extension pipe toward the fixing device.
The surplus space can be effectively utilized for mixing, and the hot and cold water in the first and second extension pipes can be guided to the fixing device and efficiently discharged outside the water heater.

[Details of the embodiment of the present disclosure]
The present disclosure will be described below with reference to the embodiments. The present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

<Embodiment>
An embodiment of the present disclosure will be described with reference to Fig. 1 to Fig. 6. In the following description, the front-rear direction, the up-down direction, and the left-right direction are based on the directions indicated by arrows in each figure.

[Overall structure of the water heater]
FIG. 1 is a front view of the freestanding water heater 1, showing a state in which a front cover (not shown) is removed. FIG. 6 is a schematic circuit diagram of the freestanding water heater 1. As shown in FIG. 1, the freestanding water heater 1 is configured to include a square box-shaped housing H with an opening on the front side, a combustion device, a primary heat exchanger HE1, a secondary heat exchanger HE2, a plurality of internal pipes IP, and a front cover that covers the opening on the front side of the housing H. In the housing H, the combustion device, the primary heat exchanger HE1, and the secondary heat exchanger HE2 are arranged in order from the bottom. The plurality of internal pipes IP are a plurality of pipes arranged in a closed space formed by the housing H and the front cover. The plurality of internal pipes IP include a water inlet pipe 22, a hot water outlet pipe 27, a return pipe 35, a forward pipe 42, and the like. The detailed configuration of each internal pipe IP will be described later, showing the connection with other members and the arrangement in the freestanding water heater 1.

The freestanding water heater 1 is a freestanding type that is placed on a support surface such as the ground or the floor of a building. For this reason, fixtures 70 for connecting the ends of the internal piping IP, such as the water inlet 71, hot water outlet 72, hot water inlet 73, hot water outlet 74, drain outlet 75, and gas inlet 76, are formed on one (left) side plate HA of the housing H. For example, the fixture 70 connects the downstream end of the hot water outlet pipe 27 to the hot water outlet 72 provided on one side plate HA.

As a result, some of the internal pipes IP connected to the multiple fixtures 70 are densely arranged near one side plate HA of the housing H. In other words, a surplus space SS is formed between each heat exchanger HE1, HE2 and one side plate HA, and some of the internal pipes IP connected to the multiple fixtures 70 are densely arranged in the surplus space SS.

The freestanding water heater 1 of this embodiment is configured with two circuits, a hot water supply circuit A and a bath circuit B, as shown in FIG. 6. The hot water supply circuit A is a circuit that heats water from a tap or the like and flows it out as hot water. The bath circuit B is a circuit that circulates and heats the hot water in the bathtub 37. The freestanding water heater 1 has a hot water supply combustion chamber 4 and a bath combustion chamber 5 separated by a partition member 3 and a burner 6 in an inner body 2 housed in a housing H. The burner 6 is equipped with a hot water supply burner 6A arranged at the bottom of the hot water supply combustion chamber 4 and a bath burner 6B arranged at the bottom of the bath combustion chamber 5. In addition, each combustion chamber 4, 5 is provided with an ignition plug 8 and a flame rod 9. A combustion fan 10 that supplies combustion air to each burner 6A, 6B is provided at the bottom of the inner body 2.

At the top of the hot water combustion chamber 4, there are a hot water primary heat exchanger 11 and a hot water secondary heat exchanger 12 through which the combustion exhaust from the hot water burner 6A passes. At the top of the bath combustion chamber 5, there are a bath primary heat exchanger 13 and a bath secondary heat exchanger 14 through which the combustion exhaust from the bath burner 6B passes. An exhaust hood 15 is fixed to the downstream end of each secondary heat exchanger 12, 14. The exhaust hood 15 has an exhaust port 16 that discharges the combustion exhaust that has passed through each secondary heat exchanger 12, 14. The hot water primary heat exchanger 11 and the bath primary heat exchanger 13 form a primary heat exchanger HE1, and the hot water secondary heat exchanger 12 and the bath secondary heat exchanger 14 form a secondary heat exchanger HE2.

A gas pipe 17, which is connected to a gas pipe from outside, is connected to a gas inlet 76 provided on one side plate HA of the housing H. Gas branch pipes 18, 18... branching off from the gas pipe 17 are connected to the hot water burner 6A and the bath burner 6B, respectively, and each gas branch pipe 18 is provided with a gas solenoid valve 19 that opens and closes the gas flow path. In addition, a main gas solenoid valve 20 and a gas proportional valve 21 are provided upstream of the gas pipe 17 before branching.

The inlet of the heat absorption tube of the hot water secondary heat exchanger 12 is connected to the water inlet 71 of one side plate HA of the housing H. The water inlet tube 22 is provided with a strainer 23 equipped with a drain plug, a hot water volume sensor 24 for detecting the volume of water flowing through the water inlet tube 22, a hot water inlet thermistor 25 for detecting the inlet water temperature, and a water volume control valve 26 for controlling the volume of water flowing through the water inlet tube 22, from the upstream side. The outlet of the heat absorption tube is connected to the inlet of the heat transfer tube of the hot water primary heat exchanger 11, and the outlet 32 of the heat transfer tube is connected to the hot water outlet 72 of one side plate HA of the housing H. The hot water outlet tube 27 is provided with a hot water heat exchanger thermistor 28 for detecting the outlet temperature from the hot water primary heat exchanger 11, and a hot water outlet thermistor 29 for detecting the outlet temperature from the appliance downstream of the hot water heat exchanger thermistor 28. A bypass pipe 30 that bypasses the hot water primary and secondary heat exchangers 11 and 12 is connected between the upstream side of the hot water outlet thermistor 29 in the hot water outlet pipe 27 and the downstream side of the water volume control valve 26 in the water inlet pipe 22, and the bypass pipe 30 is provided with a water distribution valve 31 that controls the bypass flow rate.

In this way, inside the housing H, a hot water supply circuit A is formed in which water from the water inlet pipe 22 passes through the hot water supply secondary heat exchanger 12 and the hot water supply primary heat exchanger 11 in that order, is heated by heat exchange with the combustion exhaust from the hot water supply burner 6A, and then is discharged from the hot water supply outlet pipe 27.

On the other hand, a return pipe 35 connected to a hot water inlet 73 on one side panel HA of the housing H is connected to the inlet of the heat absorption pipe of the bath secondary heat exchanger 14. The hot water inlet 73 is connected to the bathtub 37 via an external return pipe 36. A pump 38 is provided downstream of the return pipe 35. A bath return thermistor 39 that detects the bath return temperature is provided upstream of the pump 38. A water flow switch 40 and a water level sensor 41 are provided downstream of the pump 38. The water flow switch 40 detects the flow of hot and cold water sent out from the pump 38 and activates the bath burner 6B.

The outlet of the heat absorption tube of the bath secondary heat exchanger 14 is connected to the inlet of the heat transfer tube of the bath primary heat exchanger 13. The outlet of the heat transfer tube is connected to a feed pipe 42 that is connected to a hot water outlet 74 on one side plate HA of the housing H. The hot water outlet 74 is connected to the bathtub 37 via an external feed pipe 43. The feed pipe 42 is provided with a bath feed thermistor 44 that detects the bath feed temperature.

In this way, within the housing H, a bath circuit B is formed in which hot and cold water in the bathtub 37 passes through the return pipe 35, the bath secondary heat exchanger 14, and the bath primary heat exchanger 13 in that order by operating the pump 38, where it is heated by heat exchange with the combustion exhaust from the bath burner 6B, and then returns to the bathtub 37 through the supply pipe 42.

A drop pipe 45 is connected between the downstream side of the bypass pipe 30 in the hot water outlet pipe 27 and the upstream side of the pump 38 in the return pipe 35. A drop water solenoid valve 46 that opens and closes the drop pipe 45 and a bath water volume sensor 47 that detects the amount of water flowing through the drop pipe 45 are provided on the upstream side (hot water outlet pipe 27 side) of this drop pipe 45. Three check valves 48, 48, 48 are provided downstream of the bath water volume sensor 47. A cutoff valve 49 is connected between these check valves 48. This cutoff valve 49 is connected to a drain pipe 50 connected to a drain outlet 75 provided on one side plate HA of the housing H and an inlet pipe 51 connected to the downstream side of the strainer 23 in the water inlet pipe 22. When the internal pressure of the hot water in the drop pipe 45 increases due to the back pressure from the return pipe 35 and becomes greater than the back pressure from the inlet pipe 51, the cutoff valve 49 discharges the hot water that has backflowed from the drop pipe 45 through the drain pipe 50 to the drain outlet 75.

A neutralizer 55 is provided within the housing H to neutralize the drain generated in the hot water secondary heat exchanger 12 and the bath secondary heat exchanger 14. This neutralizer 55 is connected to a drain receiver 56 provided on the bottom surface of the exhaust hood 15 via a drain inlet pipe 57, and is connected to the drain pipe 50 of the cutoff valve 49 via a drain outlet pipe 58. The neutralizer 55 is also provided with a water level electrode 59 for detecting the water level, and a drain outlet 60 for discharging the drain from one side panel HA of the housing H.

As shown in FIG. 1, the freestanding water heater 1 includes a controller 7 that receives detection signals from thermistors, sensors, etc. and operates various valves to control the outlet water temperature and the filling of the bathtub 37, and a remote control (not shown) that is communicatively connected to the controller 7. The controller 7 is installed below the combustion device. The controller 7 is configured, for example, as a known microcomputer, and is configured to be able to acquire signals from various sensors provided in the freestanding water heater 1, and is configured to be able to control various actuators provided in the freestanding water heater 1. For example, when the freestanding water heater 1 detects the flow of water in the water inlet pipe 22 by the hot water supply amount sensor 24, it operates the hot water supply burner 6A to generate hot water.

[Detour route]
In general, in a freestanding water heater, the distance from the hot water primary heat exchanger to the hot water outlet is shorter than in a suspended fixed type, and the hot water outlet path of the hot water outlet pipe is also likely to be short. Therefore, the distance from the connection point with the bypass pipe to the fixture becomes even shorter, and the water from the bypass pipe cannot be mixed sufficiently in the hot water outlet pipe, so that the detected temperature of the hot water outlet thermistor fluctuates and the combustion control may become unstable. For this reason, in the freestanding water heater 1 of the present disclosure, as shown in FIG. 3, the hot water outlet path OR of the hot water outlet pipe 27 is provided with a detour path DR formed downstream of the connection point 33 with the bypass pipe 30 and bypassing a structure (the drop pipe 45 is exemplified in FIG. 1) arranged inside the housing H.

As shown in Figures 2 to 5, the hot water outlet pipe 27 includes a descending pipe section 27A that descends from the outlet section 32 of the hot water primary heat exchanger 11 toward one side plate HA, a connecting pipe section 27B that extends horizontally from the downstream end of the descending pipe section 27A, an ascending pipe section 27C that extends upward from the downstream end of the connecting pipe section 27B toward the surplus space SS, a first extension pipe 27D that extends from the downstream end (upper end) of the ascending pipe section 27C toward one side plate HA within the surplus space SS, and a second extension pipe 27E that extends downward from the downstream end of the first extension pipe 27D toward the fixture 70.

The detour path DR of the discharge pipe 27 is the portion of the discharge path OR downstream of the connection point 33 with the bypass pipe 30. The detour path DR of the discharge pipe 27 is arranged in the surplus space SS and is formed by detouring upward to avoid the drop pipe 45.

In this embodiment, the hot water outlet path OR is a detour path DR downstream of the connection point 33 with the bypass pipe 30, so a long distance can be secured between the connection point 33 with the bypass pipe 30 and the fixture 70 on one side panel HA of the housing H. Therefore, even when a common heat exchanger is used with a suspended fixed water heater, the water from the bypass pipe 30 can be sufficiently mixed within the hot water outlet path OR, and fluctuations in the detected temperature of the hot water supply and outlet thermistor 29 can be prevented.

In addition, because the connecting pipe section 27B is located lower than the descending pipe section 27A and the ascending pipe section 27C, when the drain plug provided on the fixture 70 is removed, the hot and cold water in the ascending pipe section 27C and the descending pipe section 27A can be guided to the fixture 70 through the bypass pipe 30 and easily drained outside the freestanding water heater 1.

In addition, the rising pipe section 27C extends toward the surplus space SS, and from the upper end of the rising pipe section 27C, a first extension pipe 27D extends toward one side plate HA within the surplus space SS, and from this first extension pipe 27D, a second extension pipe 27E extends downward toward the fixture 70, so that the surplus space SS can be effectively utilized for mixing. Furthermore, the hot and cold water in the first and second extension pipes 27D, 27E can be guided to the fixture 70 and efficiently extracted outside the freestanding water heater 1.

[Effects of the embodiment]
As described above, the free-standing water heater 1 according to the embodiment is a free-standing water heater 1 placed on a support surface, and includes a housing H having a pair of side panels HA, HB, a primary heat exchanger HE1 arranged inside the housing H and having an outlet portion 32 from which heated water flows out, a hot water outlet pipe 27 extending from the outlet portion 32 of the primary heat exchanger HE1 toward one of the side panels HA, a fixing device 70 connecting the downstream end of the hot water outlet pipe 27 to a hot water outlet 72 provided on one of the side panels HA, a bypass pipe 30 connected to the hot water outlet pipe 27 and allowing water to flow into the hot water outlet path OR of the hot water outlet pipe 27, and a hot water supply and outlet thermistor 29 provided at the downstream end of the hot water outlet pipe 27 and detecting temperature, and the hot water outlet path OR of the hot water outlet pipe 27 is a free-standing water heater 1 including a bypass path DR formed downstream of a connection point 33 with the bypass pipe 30 and bypassing a structure arranged inside the housing H.

The hot water outlet path OR is a detour path DR downstream of the connection point 33 with the bypass pipe 30, so a long distance can be secured between the connection point 33 with the bypass pipe 30 and the fixture 70. Therefore, even if a common heat exchanger is used, the water from the bypass pipe 30 can be mixed sufficiently within the hot water outlet path OR. This prevents the temperature detected by the hot water supply and outlet thermistor 29 from fluctuating.

The hot water outlet pipe 27 includes a downflow pipe section 27A that descends from the outlet section 32 of the primary heat exchanger HE1 toward one side plate HA, a connecting pipe section 27B that extends horizontally from the downstream end of the downflow pipe section 27A, and an upflow pipe section 27C that extends upward from the downstream end of the connecting pipe section 27B. It is preferable that the connecting pipe section 27B is provided with a connection point 33 with the bypass pipe 30.

Since the connecting pipe section 27B is located lower than the descending pipe section 27A and the rising pipe section 27C, when the drain plug provided on the fixing device 70 is removed, the hot and cold water in the descending pipe section 27A and the rising pipe section 27C can be easily drained outside the freestanding water heater 1 through the bypass pipe 30.

The rising pipe section 27C extends toward the surplus space SS formed between each heat exchanger HE1, HE2 and one of the side plates HA, and the discharge pipe 27 preferably includes a first extension pipe 27D extending from the upper end of the rising pipe section 27C toward one of the side plates HA within the surplus space SS, and a second extension pipe 27E extending downward from the downstream end of the first extension pipe 27D toward the fixture 70.

The surplus space SS can be effectively utilized for mixing, and the hot and cold water in the first and second extension pipes 27D, 27E can be guided to the fixture 70 and efficiently discharged outside the freestanding water heater 1.

<Other embodiments>
(1) In the above embodiment, the freestanding water heater 1 has the hot water circuit A and the bath circuit B. However, the freestanding water heater 1 may have only the hot water circuit A.

(2) In the above embodiment, the freestanding water heater 1 has a primary heat exchanger HE1 and a secondary heat exchanger HE2, but the freestanding water heater 1 may have only the primary heat exchanger HE1.

(3) In the above embodiment, the hot water outlet path OR of the hot water outlet pipe 27 has a bypass path DR formed to bypass the drop-in pipe 45, but the structure arranged inside the housing H is not limited to the drop-in pipe 45 and may be other pipes or fixtures.

(4) In the above embodiment, the connecting pipe section 27B is provided with a connection point 33 with the bypass pipe 30, but the connecting pipe section 27B is not a required configuration, and the downflow pipe section 27A may be provided with a connection point with the bypass pipe 30.

(5) In the above embodiment, the discharge pipe 27 includes a first extension pipe 27D and a second extension pipe 27E within the surplus space SS. However, if the surplus space is narrower than the surplus space SS in this embodiment, the discharge pipe may include only the second extension pipe without including the first extension pipe.

Description of the Reference Signs 1: Freestanding water heater 2: Inner body 3: Partition member 4: Water supply combustion chamber 5: Bath combustion chamber 6: Burner 6A: Water supply burner 6B: Bath burner 7: Controller 8: Spark plug 9: Flame rod 10: Combustion fan 11: Water supply primary heat exchanger 12: Water supply secondary heat exchanger 13: Bath primary heat exchanger 14: Bath secondary heat exchanger 15: Exhaust hood 16: Exhaust port 17: Gas pipe 18: Gas branch pipe 19: Gas solenoid valve 20: Main gas solenoid valve 21: Gas proportional valve 22: Water inlet pipe 23: Strainer 24: Water supply water volume sensor 25: Water supply inlet thermistor 26: Water volume control valve 27: Water outlet pipe 27A: Downstream pipe section 27B: Connecting pipe section 27C: Upstream pipe section 27D: First extension pipe 27E: Second extension pipe 28: Hot water heat exchanger thermistor 29: Hot water outlet thermistor 30: Bypass pipe 31: Water distribution valve 32: Outlet 33: Connection point 35: Return pipe 36: External return pipe 37: Bathtub 38: Pump 39: Bath return thermistor 40: Water flow switch 41: Water level sensor 42: Supply pipe 43: External supply pipe 44: Bath supply thermistor 45: Drop pipe 46: Drop water solenoid valve 47: Bath water level sensor 48: Check valve 49: Cut-off valve 50: Drain pipe 51: Inlet pipe 55: Neutralizer 56: Drain receiver 57: Drain inlet pipe 58: Drain outlet pipe 59: Water level electrode 60: Drain outlet 70: Fixture 71: Water inlet 72: Hot water outlet 73: Hot water inlet 74: Hot water outlet 75: Drain outlet 76: Gas inlet A: Hot water circuit B: Bath circuit DR: Bypass route IP: Internal piping H: Housing HA: One side panel HB: Other side panel HE1: Primary heat exchanger HE2: Secondary heat exchanger OR: Hot water outlet route SS: Surplus space

Claims (3)

A freestanding water heater that is placed on a placement surface,
A housing having a pair of side panels;
a heat exchanger disposed within the housing and having an outlet through which heated water flows;
a hot water outlet pipe extending from the outlet portion of the heat exchanger toward one of the side plates;
a fixture for connecting a downstream end of the tap pipe to a tap port provided on one of the side plates;
A bypass pipe connected to the hot water outlet pipe for allowing water to flow into the hot water outlet path of the hot water outlet pipe;
A hot water outlet thermistor is provided at the downstream end of the hot water outlet pipe to detect a temperature.
A free-standing water heater, wherein the hot water outlet path of the hot water outlet pipe is provided with a detour path formed downstream of the connection point with the bypass pipe and configured to detour around a structure arranged inside the housing. The outlet pipe includes a downflow pipe section that descends from the outlet portion of the heat exchanger toward one of the side plates, a connecting pipe section that extends horizontally from a downstream end of the downflow pipe section, and an upflow pipe section that extends upward from the downstream end of the connecting pipe section,
The freestanding water heater according to claim 1 , wherein the connecting pipe section is provided with a connection point with the bypass pipe. The riser pipe portion extends toward an excess space formed between the heat exchanger and one of the side plates,
The free-standing water heater of claim 2, wherein the outlet pipe comprises a first extension pipe extending from the upper end of the riser pipe section toward one of the side panels within the excess space, and a second extension pipe extending downward from the downstream end of the first extension pipe toward the fixing device.

Images