Water heater

Abstract

To provide a water heater which is constituted so as to prevent electrical components stored in a case from being poured with droplets by rainwater.SOLUTION: In a water heater, a combustion part and a control section for performing combustion control of the combustion part are stored in a box-like case including an opening (12) for inserting an exhaust pipe into, and a front panel (11) having an air supply opening below the opening, and clean water is heated and supplied by using combustion heat generated in the combustion part. A rainproof plate (13) for preventing immersion of rainwater from the air supply opening into the case is equipped on the rear face of the front panel, and an air-supply passage (14) is formed between the front panel and the rainproof plate. The rainproof plate has a rainwater introduction part (15) formed in an outlet of the air-supply passage below the opening so as to receive rainwater immersing from the opening and making it flow down, and the rainwater introduction part is formed in an outward bulged state by separating the top edge part of the rainproof plate forming the outlet from the front panel.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a hot water heater that contains a combustion section and a control section that controls combustion in the combustion section in a box-shaped case, and that supplies hot water by utilizing the combustion heat generated in the combustion section. [Background technology]

[0002] Conventionally, there has been a wide use of combustion-type hot water heaters that burn, for example, fuel gas in a combustion section to generate combustion heat and use this combustion heat to heat hot water. As shown in Patent Documents 1 and 2, for example, the hot water heater is formed by accommodating a burner, a blower fan that sends air for combustion to the burner, a fuel supply section that adjusts the fuel supplied to the burner, a heat exchanger that uses the combustion heat to heat clean water, and a control section that controls the combustion in the combustion section, all housed in a box-shaped case.

[0003] Since water heaters are often installed outdoors, electrical components that may break down or malfunction due to exposure to water, such as the blower fan and control unit, are housed in a box-shaped case and protected from exposure to water during rain by the case. The case has a removable front panel so that the case can be opened for maintenance of the internal devices, for example. The front panel has multiple air intakes for supplying air from outside the case to the blower fan.

[0004] A rainproof plate is provided on the rear surface of the front panel to prevent rainwater from entering the case together with the air introduced into the case from the air intake port on the front panel during rainfall and causing the electrical components inside the case to become wet. The rainproof plate changes the flow direction of the air introduced from the air intake port, and catches and drops the rainwater that enters with the air. The rainproof plate also guides the air from the air intake port upward into the air intake passage between the front panel and the rainproof plate, leading to the inside of the case. As a result, rainwater that enters from the air intake port is drained outside the case without entering the case beyond the rainproof plate. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 9-329356 [Patent Document 2] JP 2020-16382 A Summary of the Invention [Problem to be solved by the invention]

[0006] The water heater has an exhaust pipe for discharging the exhaust gas that has been cooled by heat exchange in the heat exchanger to the outside. This exhaust pipe is inserted into an opening provided in the front panel of the case. The exhaust pipe is disposed in the upper part of the water heater so that the exhaust gas is discharged from a high position and is less likely to hit people in front of the water heater. Therefore, the opening of the front panel is formed in the upper part of the front panel above the upper end of the air supply passage. Since there is a gap between this opening and the exhaust pipe to allow for assembly errors, rainwater may enter the case from this opening over the rainproof plate, causing the electrical components to become wet.

[0007] On the other hand, the control unit is disposed in the lower part of the case where it is not easily affected by the heat of combustion, so as to be adjacent to the weatherproof plate. Since this control unit generates heat when energized, an air vent is provided in the part of the weatherproof plate corresponding to the control unit so that cooling air can be supplied from the intake passage. However, when it rains, rainwater may reach the control unit through the air vent, causing the control unit to become wet.

[0008] SUMMARY OF THE PRESENT DISCLOSURE In view of the above, an object of the present invention is to provide a water heating device that is configured so that electrical components housed in a case are not exposed to rainwater. [Means for solving the problem]

[0009] The water heating device of the invention of claim 1 is a water heating device in which a combustion unit and a control unit for controlling the combustion of the combustion unit are housed in a box-shaped case having an opening for inserting an exhaust pipe and a front panel having an air intake port below the opening, and which heats drinking water by heating it to supply hot water, and a rainproof plate is provided on the rear surface of the front panel to prevent rainwater from entering the case through the air intake port, and an air intake passage is formed between the front panel and the rainproof plate, and the rainproof plate has a rainwater inlet portion formed at the outlet of the air intake passage below the opening to receive rainwater entering through the opening and allow it to flow down into the air intake passage, and the rainwater inlet portion is formed in a bulging shape by separating an upper end portion of the rainproof plate which forms the outlet from the front panel.

[0010] According to the above configuration, the water heater formed by housing the combustion unit and the control unit in a box-shaped case has an opening for inserting the exhaust pipe through the front panel of the case, and an air supply port below the opening. A rainproof plate for preventing rainwater from entering through the air supply port is provided on the rear surface of the front panel, and an air supply passage is formed between the front panel and the rainproof plate. In addition, a bulging rainwater introduction portion is formed by separating the upper end portion of the rainproof plate, which forms the outlet of the air supply passage below the opening of the front panel, from the front panel. As a result, the rainproof plate prevents rainwater from entering through the air supply port, and the rainwater introduction portion receives rainwater that has entered through the opening of the front panel and allows it to flow down to the air supply passage. Therefore, it is possible to prevent the electrical components in the case from becoming wet.

[0011] The water heating device of the invention of claim 2 is characterized in that, in the invention of claim 1, it has a first guide portion extending rearward and diagonally upward from the upper end portion to guide rainwater from the opening into the air supply passage. According to the above configuration, a first guide portion is formed at the upper end portion of the rainwater introduction portion, extending rearward and diagonally upward. This first guide portion can guide more rainwater that seeps in through the opening in the front panel to the air supply passage, preventing the electrical components inside the case from becoming wet.

[0012] The hot water supply device of the invention of claim 3 is characterized in that, in the invention of claim 1, the rainwater inlet portion has a horizontally extending slit formed in the rainproof plate to guide rainwater flowing down the rear surface of the rainproof plate into the air supply passage, and a second guide portion formed by raising the lower edge portion of the slit so as to extend diagonally rearward and upward from the rainproof plate. According to the above configuration, the rainwater introduction section has a second guide section formed so that the lower edge portion of the slit formed to extend horizontally in the rainproof plate overhangs rearward. Rainwater that infiltrates through the opening in the front panel, reaches the upper end of the rainwater introduction section, and flows down along the rear surface of the rainproof plate is guided by this second guide section and introduced into the air supply passage through the slit. Therefore, more rainwater that infiltrates through the opening in the front panel can be guided into the air supply passage, and the electrical components in the case can be prevented from becoming wet.

[0013] The water heating apparatus of the invention of claim 4 is characterized in that, in the invention of claim 1, the control unit is arranged below the rainwater inlet portion, and the rainproof plate has an air vent in a portion corresponding to the control unit through which cooling air for the control unit passes, and an infiltration prevention portion is provided between the rainwater inlet portion and the air vent for guiding rainwater introduced into the air supply passage away from the left and right sides of the air vent, the infiltration prevention portion being formed by protruding the rainproof plate toward the front panel. According to the above configuration, between the cooling air vent formed in the portion of the rainproof plate corresponding to the control unit and the rainwater inlet, there is an intrusion prevention portion for preventing rainwater from infiltrating through the vent. The intrusion prevention portion is formed by protruding the rainproof plate toward the front panel, and guides rainwater introduced between the front panel and the rainproof plate away to the left and right of the vent. The rainwater inlet increases the amount of rainwater flowing down the rainproof plate between the front panel and the rainproof plate, but this rainwater is guided away from the vent by the intrusion prevention portion above the vent, and flows down the left or right of the vent. Therefore, rainwater flowing down the rainproof plate between the front panel and the rainproof plate does not reach the vent, and the control unit can be prevented from becoming wet through the vent. Effect of the Invention

[0014] According to the water heater of the present invention, it is possible to prevent the electrical components housed in the case from being wetted by rainwater. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram showing a configuration of a hot water supply device according to an embodiment of the present invention. [Diagram 2] 2 is an external perspective view of a case of the water heater of FIG. 1. FIG. [Diagram 3] 3 is a perspective view showing the rear side of the front panel of the case of FIG. 2. [Figure 4] 4 is an enlarged view of a main portion including an outlet of the air supply passage shown in FIG. 3. [Diagram 5] FIG. 4 is an enlarged view of a main part including the ventilation hole in FIG. 3. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, the mode for carrying out the present invention will be described based on examples. EXAMPLES

[0017] As shown in FIG. 1, the hot water supply device 1 is configured by accommodating a combustion section 2, a control section 7 for controlling the combustion of the combustion section 2, and the like in a box-shaped case 10. The combustion section 2 has a burner 2a for burning fuel, a fuel supply section 2b for supplying fuel to the burner 2a, a blower fan 2c for supplying air for combustion to the burner 2a, and an ignition device 2d for igniting the burner 2a by using electric discharge. Clean water is supplied from a water supply passage 4 to a heat exchanger 3, which uses heat (combustion heat) of the combustion gas generated in the combustion section 2 to heat the clean water. The hot water heated by the heat exchanger 3 is discharged to a hot water discharge passage 5. The combustion gas (combustion exhaust) used to heat the clean water by the heat exchanger 3 is discharged to the outside via an exhaust pipe 6.

[0018] A water supply flow rate sensor 4a that detects the clean water supply flow rate to the heat exchanger 3, a water supply temperature sensor 4b that detects the clean water temperature, and a distribution valve 4c located upstream of these are disposed in the water supply passage 4. A bypass passage 8 branched off from the water supply passage 4 at the distribution valve 4c is connected to the hot water outlet passage 5. A hot water supply flow rate adjustment valve 5a that adjusts the hot water supply flow rate, and a hot water supply temperature sensor 5b that detects the hot water supply temperature are disposed downstream of the connection between the hot water outlet passage 5 and the bypass passage 8.

[0019] The control unit 7 sets the amount of heat (required amount of heat) required to supply hot water at the set hot water temperature based on the flow rate detected by the water supply flow rate sensor 4a and the temperature detected by the water supply temperature sensor 4b. Then, in order to generate the required amount of heat, the control unit 7 controls the supply of fuel gas from the fuel supply unit 2b and the supply of air from the blower fan 2c to perform combustion control.

[0020] Furthermore, the control unit 7 performs hot water supply control so that the temperature detected by the hot water temperature sensor 5b, i.e., the temperature of the hot water to be supplied, becomes the hot water supply set temperature by mixing the hot water heated by the heat exchanger 3 with clean water from the bypass passage 8. In the hot water supply control, the distribution ratio of clean water to the bypass passage 8 and the heat exchanger 3 is adjusted by adjusting the distribution valve 4c, and the flow rate is adjusted by the hot water supply flow rate adjustment valve 5a when necessary, for example, to supply high-temperature hot water.

[0021] The hot water supply device 1 has a reheating passage 21 and a bath pump 22 for circulating hot water in a bathtub (not shown), and a bath heat exchanger 23 for heating the hot water flowing through the reheating passage 21. The bath heat exchanger 23 heats the hot water in the bathtub using the combustion heat generated by the reheating burner 2e of the combustion section 2. The control section 7 drives the bath pump 22 and operates the ignition device 2f that uses electric discharge to ignite and burn the reheating burner 2e, thereby performing reheating.

[0022] At the hot water supply flow rate adjustment valve 5a, a hot water pouring passage 24 branched off from the hot water outlet passage 5 is connected to the reheating passage 21. A hot water pouring valve 25, a hot water pouring flow rate sensor 26, and a water level sensor 27 for detecting the water level in the bathtub are disposed in the hot water pouring passage 24. The control unit 7 opens the hot water pouring valve 25, fills the bathtub with temperature-adjusted hot water supplied from the hot water outlet passage 5 via the hot water pouring passage 24 and the reheating passage 21, and closes the hot water pouring valve 25 when the bathtub has been filled to a preset amount (water level).

[0023] The heat exchanger 3 and the bath heat exchanger 23 each have a primary heat exchanger that recovers the sensible heat of the combustion gas and a secondary heat exchanger that recovers the latent heat of the combustion gas. The acidic drain water, which is formed when moisture contained in the combustion gas is condensed in the secondary heat exchanger, is collected in a neutralizer 28 that contains a neutralizing agent, neutralized, and drained.

[0024] As shown in Fig. 2, box-shaped case 10 has a removable front panel 11. Arrows U, F, and L in the figure indicate the upper (U), front (F), and left (L) directions of water heater 1 (case 10), respectively. Front panel 11 is formed to bulge forward, and an opening 12 is formed in its upper part for inserting exhaust pipe 6. In addition, a plurality of air intake ports 11a are formed below opening 12 of front panel 11 in order to supply air into case 10 from the front and sides of front panel 11. Although not shown, front panel 11 is also formed with an air intake port that takes in air from below.

[0025] As shown in Fig. 3, a rainproof plate 13 having approximately the same size as the front panel 11 and a notch at the top to avoid the opening 12 is attached to the rear surface of the front panel 11, which is the inside of the case 10. The left and right edges of the notch and the left and right ends and bottom end of the rainproof plate 13 are fixed to the front panel 11. A reinforcing part connecting the left and right parts of the notch may be fixed to the front panel 11 below the opening 12. The rainproof plate 13 protrudes most of its length toward the front panel 11 in order to avoid interference with equipment and piping, such as the combustion unit 2, inside the case 10.

[0026] Between the front panel 11 and the rain guard plate 13, an air supply passage 14 is formed through which air from the multiple air supply ports 11a passes. Below the opening 12, an outlet of the air supply passage 14 is formed by an upper end portion of the rain guard plate 13 separated from the front panel 11. The flow direction of the air introduced from the air supply port 11a is changed by the rain guard plate 13, flows upward through the air supply passage 14, and reaches the inside of the case 10 from the outlet of the air supply passage 14. The air from the air supply port 11a located above the outlet of the air supply passage 14 flows downward by the rain guard plate 13, then changes direction and flows upward to reach the outlet of the air supply passage 14. Note that some of the air rises through the space between the front panel 11 and the rain guard plate 13 that extends vertically on the left and right of the opening 12 and reaches the inside of the case 10.

[0027] The rain guard 13 receives rainwater that enters the air supply passage 14 together with the air introduced from the air supply port 11a, drops it, and guides it to an air supply port (not shown) provided at the lower end of the front panel 11 for drainage. Because water is heavier than air, it is difficult for the rainwater that enters from the air supply port 11a to move upward through the air supply passage 14, pass over the rain guard 13, and reach the inside of the case 10.

[0028] Furthermore, the rainproof plate 13 guides rainwater that has entered through the opening 12 into the air supply passage 14 between the plate and the front panel 11, and drains it by letting it flow down. For this purpose, a rainwater inlet 15 is provided at the outlet of the air supply passage 14 below the opening 12. The rainwater inlet 15 is formed in a rearward bulging shape by separating the upper end portion of the rainproof plate 13, which forms the outlet of the air supply passage 14, from the front panel 11 without protruding toward the front panel 11 or by reducing the amount of protrusion. This rainwater inlet 15 has a two-stage shape with a portion that is farther away from the front panel 11 and a portion that is farther away from the front panel 11 in the left-right direction so as not to interfere with the devices and piping inside the case 10.

[0029] A first guide portion 16 for guiding rainwater between the rainproof plate 13 and the front panel 11 is provided in a portion where the separation distance of the rainwater introduction portion 15 is large. As shown in Fig. 4, the first guide portion 16 is formed such that the upper end portion of the portion where the separation distance of the rainwater introduction portion 15 is large extends rearward and diagonally upward, and extends further inward (rearward) of the case 10 than the rainwater introduction portion 15. Note that if the first guide portion 16 interferes with the devices and piping in the case 10, the first guide portion 16 may be formed partially, or the first guide portion 16 may not be formed at all.

[0030] The portion of rainwater inlet 15 with a small separation distance avoids interference with components that will not cause problems if they get wet, such as water piping. However, because the separation distance from front panel 11 is small, some of the rainwater that seeps in through opening 12 is not guided to air supply passage 14, but flows down along the rear surface of rainproof plate 13. To guide this rainwater into air supply passage 14, rainwater inlet 15 has second guide portion 17 and slit 18 below the upper end where it will not interfere with the equipment and piping inside case 10.

[0031] The second guide section 17 is formed by raising the lower edge of a slit 18 formed horizontally in a portion where the separation distance of the rainwater introduction section 15 is small, so as to extend rearward and diagonally upward, and projecting behind the rainproof plate 13. Rainwater flowing down the rear surface of the rainproof plate 13 falls from the upper end portion of the slit 18, and is guided by the second guide section 17 through the slit 18 to the air supply passage 14 between the rainproof plate 13 and the front panel 11 by the second guide section 17. If the second guide section 17 interferes with the equipment and piping in the case 10, the second guide section 17 may be partially formed, or the second guide section 17 may not be formed. Furthermore, if there is no interference with the equipment and the like in the case 10, the second guide section 17 may be formed in a portion where the separation distance of the rainwater introduction section 15 is large, and the first guide section 16 may be formed in a portion where the separation distance of the rainwater introduction section 15 is small.

[0032] The devices housed in the case 10, namely the fuel supply unit 2b, the blower fan 2c, the ignition device 2d, the sensors such as the water supply flow rate sensor 4a, the valves such as the distribution valve 4c, and the bath pump 22, are electric components that operate on electricity, and the control unit 7 that controls them is also an electric component. The control unit 7 generates heat when powered, so that in order to cool it, a number of vents 13a that pass air from the air supply passage 14 are formed in a portion of the rainproof plate 13 that corresponds to the control unit 7 below the rainwater introduction portion 15 as shown in Figs. 3 and 5. The control unit 7 is disposed in the lower part of the case 10, which is not easily affected by the heat of the combustion unit 2 and the heat of the exhaust pipe 6, so as to be close to the front panel 11, and is cooled by air that is introduced from the air supply port 11a and supplied through the vents 13a.

[0033] During rainfall, the rainwater introduction section 15 increases the amount of rainwater flowing down the air supply passage 14 between the rainproof plate 13 and the front panel 11. If the rainwater introduction section 15 is provided with one or both of the first guide section 16 and the second guide section 17, the amount of rainwater flowing down the air supply passage 14 further increases. The rainproof plate 13 has an infiltration prevention section 19 between the multiple air vents 13a and the rainwater introduction section 15 to prevent this rainwater from infiltrating into the case 10 through these air vents 13a and causing the control section 7 to become wet.

[0034] The infiltration prevention portion 19 is a canopy formed by projecting the rainstop plate 13 into the air supply passage 14 toward the front panel 11, and is formed in an umbrella shape that guides rainwater flowing down the front panel 11 side of the rainstop plate 13 in the left-right direction so as to move it away from the air vents 13a. Rainwater that flows down the rainstop plate 13 and reaches the infiltration prevention portion 19 is guided to flow to the right or left of the multiple air vents 13a, so that the rainwater does not reach these air vents 13a.

[0035] When the blower fan 2c is not in operation, the heat from the control unit 7 warms the surrounding air and causes it to flow upward, and air is supplied from the air supply passage 14 through the multiple vents 13a to the periphery of the control unit 7. When the blower fan 2c is in operation, the amount of air supplied through the multiple vents 13a increases. Since the intrusion prevention unit 19 prevents rainwater from reaching the multiple vents 13a during rainfall, the control unit 7 is prevented from being wetted by rainwater from the vents 13a regardless of the operating state of the blower fan 2c.

[0036] The operation and effects of the above-described water heating apparatus 1 will now be described. Water heater 1, formed by housing combustion section 2 and control section 7 in box-shaped case 10, has an opening 12 for inserting exhaust pipe 6 and air intake port 11a in front panel 11 of case 10. A rainproof plate 13 for preventing rainwater from entering through air intake port 11a is attached to the rear surface of front panel 11, and an air intake passage 14 is formed between front panel 11 and rainproof plate 13.

[0037] The rainproof plate 13 has a bulging rainwater introduction portion 15 formed away from the front panel 11 at an upper end portion of the rainproof plate 13 that forms the outlet of the air supply passage 14 below the opening 12 of the front panel 11. This allows the rainproof plate 13 to prevent rainwater from entering through the air supply port 11a, and allows rainwater that has entered through the opening 12 of the front panel 11 to be received by the rainwater introduction portion 15 and flow down into the air supply passage 14. This prevents electrical components inside the case 10, such as the control unit 7, from becoming wet.

[0038] A first guide portion 16 extending rearward and diagonally upward is formed at the upper end portion of the rainwater introduction portion 15. This first guide portion 16 can guide more rainwater that seeps in through the opening 12 of the front panel 11 to the air supply passage 14, and can prevent the electrical components inside the case 10 from becoming wet.

[0039] The rainwater introduction section 15 has a second guide section 17 formed so that the lower edge portion of a slit 18 formed to extend horizontally in the rainstop plate 13 projects rearward. Rainwater that enters through the opening 12 in the front panel 11, reaches the upper end of the rainwater introduction section 15, and flows down along the rear surface of the rainstop plate 13 is guided by the second guide section 17 and introduced from the slit 18 into the air supply passage 14. Therefore, more rainwater that enters through the opening 12 in the front panel 11 can be guided to the air supply passage 14, and the electrical components inside the case 10 can be prevented from becoming wet.

[0040] The rainproof plate 13 has an infiltration prevention portion 19 between the cooling air vent 13a formed in the portion corresponding to the control portion 7 and the rainwater introduction portion 15, for preventing rainwater from infiltrating through the vent 13a. The infiltration prevention portion 19 is formed by protruding the rainproof plate 13 toward the front panel 11, and guides rainwater that is introduced into the air supply passage 14 and flows down along the rainproof plate 13 away from the left and right of the vent 13a. The rainwater introduction portion 15 increases the amount of rainwater flowing down the air supply passage 14 along the rainproof plate 13, but this rainwater is guided away from the vent 13a by the infiltration prevention portion 19 above the vent 13a, and flows down the left or right of the vent 13a. Therefore, rainwater flowing down between the rain guard plate 13 and the front panel 11 does not reach the ventilation opening 13a, and the control unit 7 can be prevented from becoming wet through the ventilation opening 13a.

[0041] The rainwater introduction section 15 may be formed by protruding the rainproof plate 13 rearward (inward of the case 10) so as not to interfere with the devices inside the case 10. In addition, a person skilled in the art can implement the present invention in a form in which various modifications are added to the above embodiment without departing from the spirit of the present invention, and the present invention includes such modifications. [Explanation of symbols]

[0042] 1: Hot water supply equipment 2: Combustion section 2a: Burner 2b:Fuel supply section 2c: Blower fan 2d:Ignition device 2e: Reheat burner 3: Heat exchanger 4:Water supply passage 4a: Water supply flow sensor 4b: Water supply temperature sensor 4c: Distribution valve 5: Hot water passage 5a: Hot water flow control valve 5b: Hot water temperature sensor 6:Exhaust stack 7: Control section 8: Bypass passage 10: Case 11: Front panel 11a: Air supply port 12: Opening 13: Rainproof board 13a: Vent 14: Air supply passage 15: Rainwater inlet 16: 1st induction part 17:Second induction part 18: Slit 19: Intrusion prevention part 21: Reheating passage 22: Bath pump 23: Bath heat exchanger 24: Pouring passage 25: Pouring valve 26: Pouring flow rate sensor 27: Water level sensor 28: Neutralizer

Claims

1. A hot water supply device that uses combustion heat generated by the combustion unit to heat drinking water and supply hot water, the device including a combustion unit and a control unit that controls combustion of the combustion unit, housed in a box-shaped case having an opening for inserting an exhaust pipe and a front panel having an air intake port below the opening, A rainproof plate is provided on the rear surface of the front panel to prevent rainwater from entering the case through the air intake port, and an air intake passage is formed between the front panel and the rainproof plate; The rainproof plate has a rainwater introduction portion formed at an outlet of the air supply passage below the opening in order to receive rainwater entering through the opening and allow it to flow down into the air supply passage, The hot water supply device, wherein the rainwater introduction portion is formed in a bulging shape by separating an upper end portion of the rainproof plate, which forms the outlet, from the front panel.

2. 2. The hot water supply apparatus according to claim 1, wherein the rainwater introduction portion has a first guide portion extending rearward and diagonally upward from the upper end portion in order to guide the rainwater from the opening portion into the air supply passage.

3. The hot water supply device as described in claim 1, characterized in that the rainwater inlet section has a horizontally extending slit formed in the rainproof plate to guide rainwater flowing down the rear surface of the rainproof plate into the air supply passage, and a second guide section formed by raising the lower edge portion of the slit so as to extend diagonally upward and rearward of the rainproof plate.

4. The control unit is disposed below the rainwater introduction unit, The water heater device described in claim 1, characterized in that the rainproof plate has an air vent in the part corresponding to the control unit through which cooling air for the control unit passes, and has an infiltration prevention portion between the rainwater inlet portion and the air vent that guides rainwater introduced into the air supply passage away from the left and right sides of the air vent, the infiltration prevention portion being formed by protruding the rainproof plate toward the front panel.

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