JP2007085579A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater dispensing with draining equipment for discharging drain. <P>SOLUTION: In this water heater 1, the drain generated in a sub-heat exchanger 10 is absorbed by cloth 50 supported by a cloth supporting member 45. The air supplied by an air supply fan 5 for combustion is partially distributed toward the cloth 50 retaining the drain, thus the drain retained by the cloth 50 is vaporized and discharged to the outside of a water heater main body 2. Thus the draining equipment for discharging the drain becomes unnecessary, and further piping work and the like for the draining equipment becomes unnecessary. Further the vaporizing efficiency of the cloth 50 can be improved as the cloth 50 is not only suspended by the cloth supporting member 45 but also the discharge air of the air supply fan 5 for combustion is partially distributed thereto. As the air supply fan 5 for combustion used in a conventional constitution can be utilized, a manufacturing cost of a vaporizing discharging means can be saved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water heater, and more particularly, to a water heater provided with a heat exchanger that recovers sensible heat and latent heat from combustion exhaust of a burner to heat water.

  Conventionally, a main heat exchanger mainly for the purpose of sensible heat recovery is provided upstream in the combustion exhaust passage, and a secondary heat exchanger mainly for the purpose of recovering latent heat is provided on the downstream side to achieve a high heat exchange rate. An obtained latent heat recovery type water heater is known (for example, see Patent Document 1). This type of water heater has, for example, a finned tube type auxiliary heat exchanger and a finned tube type main heat exchanger that are spaced apart in two upper and lower stages, and in the space between them, the latent heat is generated by the auxiliary heat exchanger. The drain receiving tray for receiving the drain (condensed water after the latent heat recovery) generated by the recovery is provided.

In such a latent heat recovery type water heater, first, the high-temperature combustion exhaust from the burner flows between the main fins of the main heat exchanger through the air supply fan, and heat is exchanged well. Further, the combustion exhaust whose temperature has decreased flows between the sub-fins of the sub-heat exchanger, and heat is exchanged well in the sub-heat exchanger, and is discharged outside the appliance through the exhaust hood. On the other hand, the drain generated by the latent heat recovery in the auxiliary heat exchanger placed above is collected in the drain pan, processed in the neutralizer through the drain discharge pipe, and then discharged to drainage facilities such as sewers. The
JP 2002-267273 A

  However, since the water heater described in Patent Document 1 requires a drainage facility for discharging the drain collected in the drain pan, the construction work such as piping of the drainage facility is troublesome. there were.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a water heater that does not require a drainage facility for discharging drainage.

  To achieve the above object, according to the hot water heater of the invention according to claim 1, a burner for burning fuel gas in a combustion chamber provided in the appliance, and combustion air for supplying combustion air to the burner A main heat exchanger that recovers sensible heat from the combustion gas of the supply fan and the burner to heat the water passing through the heat transfer tube, and the main heat exchanger recovers the combustion gas that has passed through the main heat exchanger. A secondary heat exchanger that collects latent heat in addition to the sensible heat that could not be exhausted to heat the water flow in the heat transfer tube, a saucer that receives drain generated by the latent heat recovery in the subsidiary heat exchanger, and a A water heater comprising vaporizing and discharging means for vaporizing the accumulated drain and discharging it out of the appliance, wherein the vaporizing and discharging means absorbs the drain accumulated in the tray and naturally evaporates; and A part of the water absorbing member is collected in the tray. Support means for supporting immersed in drain, and a blower means for blowing air toward the water absorbing member.

  According to the water heater of the invention according to claim 2, in addition to the configuration of the invention according to claim 1, the blower means is a blower fan that sucks outside air and blows it toward the water absorbing member. .

  According to the water heater of the invention according to claim 3, in addition to the configuration of the invention according to claim 1, the blower means is a pipe for guiding a part of the exhaust of the combustion air supply fan to the water absorbing member. It is.

  According to the water heater of the invention according to claim 4, in addition to the configuration of the invention according to any one of claims 1 to 3, the water absorbing member is a fabric.

  According to the water heater of the invention according to claim 5, in addition to the configuration of the invention according to any one of claims 1 to 3, the water absorbing member is a ceramic having high thermal conductivity.

  According to the water heater of the invention according to claim 6, in addition to the configuration of the invention according to any one of claims 1 to 5, the vaporizing and discharging means causes the drain to flow down from the upper part of the water absorbing member to absorb water. A drain flow means is provided.

  According to the water heater of the invention according to claim 7, in addition to the configuration of the invention according to any one of claims 1 to 5, the vaporizing and discharging means sprays water toward the water absorbing member to absorb water. Drain watering means is provided.

  In the water heater according to the first aspect of the present invention, the drain is vaporized by the vaporizing / discharging means and discharged to the outside of the appliance, so that a drainage facility for discharging the drain becomes unnecessary. Further, since the drain is vaporized and discharged into the air, it is economical because less energy is required than when the drain is evaporated and discharged.

  Further, in the water heater of the invention according to claim 2, in addition to the effect of the invention of claim 1, since the air can be blown toward the water absorbing member by the blower fan, the vaporization efficiency of the water absorbing member can be improved.

  In addition, in the water heater of the invention according to claim 3, in addition to the effect of the invention of claim 1, a part of the exhaust of the combustion air supply fan can be guided from the pipe toward the water absorbing member. The vaporization efficiency of the water absorbing member can be improved. Moreover, since the combustion air supply fan which a water heater naturally has can be utilized, manufacturing cost can be saved.

  Further, in the water heater of the invention according to claim 4, in addition to the effect of the invention according to any one of claims 1 to 3, since the water absorbing member is a fabric, the drain can be absorbed and held.

  Further, in the water heater of the invention according to claim 5, in addition to the effect of the invention according to any one of claims 1 to 3, the water absorbing member is a ceramic having high thermal conductivity, so that the drain is absorbed and held. At the same time, the temperature of the entire water absorbing member can be made uniform. Thereby, drain can be vaporized from the whole water absorption member.

  In addition, in the water heater of the invention according to claim 6, in addition to the effect of the invention according to any one of claims 1 to 5, drain is caused to flow down from the upper part of the water absorption member by the drain flow means, so that the water absorption member On the other hand, the drain can be uniformly spread and absorbed.

  Further, in the water heater of the invention according to claim 7, in addition to the effect of the invention according to any one of claims 1 to 5, the drain water is sprayed on the water absorbing member by the drain water spraying means. The drain can be supplied evenly.

  Hereinafter, the water heater which is the 1st and 2nd embodiment of the present invention is explained based on a drawing. First, the water heater 1 which is 1st Embodiment is demonstrated. FIG. 1 is a side sectional view of a water heater 1 according to the first embodiment.

  The water heater 1 according to the first embodiment includes a drain tray 17 that drains generated in the auxiliary heat exchanger 10 and a fabric 50 that absorbs and holds the drain accumulated in the tray 17. A feature of the present invention is that the drain held by the fabric 50 can be vaporized by blowing part of the air supplied from the combustion air supply fan 5 toward the fabric 50.

  First, the hot water heater 1 will be schematically described. As shown in FIG. 1, the water heater 1 includes an appliance main body 2, and a combustion chamber 3 is provided in the appliance main body 2. A combustion air supply fan 5 connected to the motor 4 is attached below the combustion chamber 3 so that outside air is taken in as combustion air through an air supply port 6 provided in the lower part of the instrument body 2. It has become. On the other hand, an exhaust port 7 for discharging combustion exhaust gas after heat exchange is provided in an upper part of the instrument body 2. Furthermore, a drain exhaust port 20 through which the vaporized drain is discharged is provided below the exhaust port 7. The positions of the air supply port 6, the exhaust port 7, and the drain exhaust port 20 are not limited to this.

  Next, the internal structure of the combustion chamber 3 will be described. In the combustion chamber 3, in order from the bottom, a burner 8 that burns a mixed gas of fuel gas and primary air from the combustion air supply fan 5, and a main that recovers mainly sensible heat in the combustion exhaust from the burner 8. A fin tube type main heat exchanger 9 having a heat transfer tube 9a and a main fin 9b, and a fin tube type sub heat having a sub heat transfer tube 10a and a sub fin 10b that mainly recover latent heat and generate drain. An exchange 10 is provided. In addition, it is preferable that the main heat exchanger 9 is made of copper having excellent heat conductivity, and the auxiliary heat exchanger 10 is made of stainless steel having excellent corrosion resistance against drain.

  Further, an exhaust hole 27 for discharging combustion exhaust after heat exchange by the main heat exchanger 9 and the sub heat exchanger 10 to the outside of the combustion chamber 3 is opened at the upper part of the combustion chamber 3. A cylindrical exhaust hood 28 is provided substantially horizontally between the exhaust hole 27 and the exhaust port 7, and one end on the downstream side of the exhaust hood 28 faces the outside of the instrument body 2 from the exhaust port 7. Protruding. The exhaust hood 28 exhausts the combustion exhaust after heat exchange (after latent heat recovery) to the outside of the instrument body 2.

  On the other hand, below the auxiliary heat exchanger 10, a stainless steel flat plate-shaped drain receiving portion 11 for receiving the generated drain is inclined. A drain discharge hole 12 for discharging the drain is opened at a contact portion between the drain receiving portion 11 and the combustion chamber 3, and a drain discharge pipe 13 is connected to the drain discharge hole 12. Further, an S-shaped trap 14 is provided in the middle of the drain exhaust pipe 13, and when the drain accumulates in the S-shaped trap 14, the combustion exhaust gas returns to the instrument through the drain exhaust pipe 13. Is preventing. A neutralizer 15 for neutralizing acidic drain is connected to one end on the downstream side of the drain exhaust pipe 13. Further, a drain exhaust pipe 16 through which the drain after neutralization treatment flows is connected to the downstream outlet of the neutralizer 15, and one end on the downstream side of the drain exhaust pipe 16 is fixed to a fabric support member 45 described later. It is arrange | positioned at the upper part of the fabric 50 made.

  In addition, an inlet of a water supply pipe 30 to which tap water is supplied is provided at the bottom of the appliance main body 2, and a downstream end of the water supply pipe 30 is connected to a water inlet of the sub heat transfer pipe 10a. Furthermore, the water outlet of the sub heat transfer tube 10a is connected to the water inlet of the main heat transfer tube 9a. And the water outlet of the main heat exchanger tube 9a is connected to the winding tube (not shown). In addition, this winding pipe is arrange | positioned so that the outer periphery of the combustion chamber 3 may be wound, and the hot water discharge pipe 31 is connected to the downstream one end part. And the exit of the downstream one end part of the hot water extraction pipe 31 is arrange | positioned at the bottom part of the instrument main body 2. FIG. The water supply pipe 30 is provided with a water-side control unit 34 having a water flow sensor and a water governor, and the gas pipe 32 for supplying gas to the burner 8 is provided with a main electromagnetic valve 35 and a gas proportional valve 36. . Further, the water flow sensor in the water-side control unit 34, the main electromagnetic valve 35, the gas proportional valve 36, and the motor 4 are arranged in the lower part of the appliance body 2 and are connected to the controller 40 that controls the combustion operation of the water heater 1. Electrically connected.

  Next, the structure of the vaporization discharge means that is a feature of the present invention will be described. A fabric support member 45 having a substantially Z-shaped cross section for hanging and supporting the fabric 50 is fixed to the inner side surface directly above the drain exhaust port 20 by welding. Furthermore, the upper end portion of the fabric 50 having a rectangular shape when viewed from the front is fixed to the fabric support member 45 by a plurality of fixtures 46 (only one is shown in FIG. 1), and is suspended downward from the instrument body 2. It has been. The material of the fabric 50 is not particularly limited. For example, synthetic fibers having a large effective vaporization area are used. Furthermore, the fabric 50 suspended from the fabric support member 45 is disposed so as to face the drain exhaust port 20. Further, a drain tray 17 for receiving drain that has fallen without being absorbed by the fabric 50 is disposed below the fabric 50. And the lower end part of the fabric 50 is immersed in the drain collected in the drain tray 17. The fabric support member 45 shown in FIG. 1 corresponds to “support means”.

  On the other hand, an insertion hole 23 is provided in the lower part of the combustion chamber 3, and the insertion hole 23 is upstream of the supply air pipe 33 for drawing a part of the supply air of the combustion air supply fan 5 out of the combustion chamber 3. One end of the side is connected. The downstream end portion of the air supply pipe 33 is disposed opposite to the surface opposite to the surface of the fabric 50 facing the drain exhaust port 20, and the downstream end portion is disposed on the back surface of the fabric 50. A diameter-expanded portion 33a that is increased in diameter is provided. With the above configuration, a vaporization discharge unit for vaporizing the drain is configured. The air supply pipe 33 shown in FIG. 1 corresponds to “pipe”.

  Next, the operation of the water heater 1 having the above configuration will be described. As shown in FIG. 1, first, tap water flows through the water supply pipe 30 by opening a hot-water tap (not shown), and the controller 40 performs a hot water supply control operation based on a detection signal from a water amount sensor in the water-side control unit 34. Start. Then, a predetermined pre-purge is performed by the combustion air supply fan 5, and then the main electromagnetic valve 35 and the gas proportional valve 36 of the burner 8 are opened, gas is supplied to the burner 8, and an igniter (not shown) is used. The ignition operation of the burner 8 is performed.

  Next, when the ignition operation ends, the proportional control is started. In this proportional control, the gas proportional valve 36 is controlled in accordance with the difference between the hot water temperature detected by the hot water temperature thermistor (not shown) and the set temperature, whereby the amount of gas is continuously changed to change the heat exchanger. The outlet temperature can be kept constant. Further, the rotational speed of the combustion air supply fan 5 is also changed in accordance with the change in the gas amount by the gas proportional valve 36, and control is performed so that the gas amount and the air supply amount are always kept in a predetermined relationship.

  Further, in this water heater 1, since the main heat exchanger 9 is provided upstream of the exhaust passage and the auxiliary heat exchanger 10 is provided downstream of the exhaust passage, high-temperature combustion exhaust from the burner 8 is generated. The combustion air supply fan 5 flows between the main fins 9b of the main heat exchanger 9 to exchange heat well. Furthermore, the combustion exhaust gas whose temperature has decreased flows between the sub fins 10b of the sub heat exchanger 10 and is also exchanging heat well in the sub heat exchanger 10 and is discharged to the outside through the exhaust hood 28.

  On the other hand, the combustion exhaust discharged from the main heat exchanger 9 is discharged at a high temperature of about 200 ° C. in order to prevent partial drain generation in a local low temperature portion such as the main heat transfer tube 9a which is a water flow portion. Has been. On the other hand, the auxiliary heat exchanger 10 collects sensible heat that could not be recovered by the main heat exchanger 9, and drainage is generated when the combustion exhaust gas temperature becomes the dew point or lower, so that latent heat can also be recovered. The drain generated here flows through the drain receiving portion 11, passes through the drain exhaust pipe 13, and is neutralized by the neutralizer 15. The drain neutralized by the neutralizer 15 is vaporized and discharged through the drain exhaust pipe 16 by the method described below.

  Next, a method for vaporizing and discharging drain in the water heater 1 will be described. First, the drain neutralized by the neutralizer 15 is dropped through the drain exhaust pipe 16 toward the upper part of the fabric 50 supported by the fabric support member 45. As described above, since the fabric 50 is suspended by the fabric support member 45, the drain dripped onto the upper portion of the fabric 50 penetrates in the direction of gravity and finally reaches the entire fabric 50. Water is absorbed. Further, the drain that has not been absorbed by the fabric 50 is stored in the drain tray 17 disposed below the fabric 50. And since the lower end part of the fabric 50 is immersed in the drain collected on the drain receiving tray 17, the drain collected on the drain receiving tray 17 is sucked up again from the lower side of the fabric 50 by capillary action. Accordingly, the maximum amount of drain that does not exceed the maximum retention capacity of the drain can be absorbed and held in the fabric 50 at all times.

  On the other hand, a part of the supply air from the combustion air supply fan 5 is supplied from the enlarged diameter portion 33 a of the supply air pipe 33 toward the back surface of the fabric 50. Thereby, during the operation of the combustion air supply fan 5, air directly hits the entire fabric 50, so that the drain absorbed and held by the fabric 50 is vaporized as needed. The vaporized drain is discharged to the outside of the instrument body 2 from the drain exhaust port 20 by the flow of air passing through the plurality of holes formed in the fabric 50. This eliminates the need for a drainage facility for discharging the drain, thus eliminating the need for piping work for the drainage facility.

  As described above, in the water heater 1 according to the first embodiment, the drain generated in the auxiliary heat exchanger 10 is absorbed by the fabric 50 and held. Then, a portion of the air supplied by the combustion air supply fan 5 is blown toward the fabric 50 where the drain is held, whereby the drain held by the fabric 50 is vaporized and discharged outside the instrument body 2. can do. This eliminates the need for a drainage facility for discharging the drain, thus eliminating the need for piping work for the drainage facility. Moreover, since not only the fabric 50 is suspended by the fabric support member 45 but also a part of the exhaust air of the combustion air supply fan is blown, the vaporization efficiency of the fabric 50 can be improved. In addition, since the combustion air supply fan 5 that the water heater originally has can be used, the manufacturing cost of the vaporization discharge means can be saved.

  Next, the water heater 100 which is 2nd Embodiment is demonstrated based on drawing. FIG. 2 is a side sectional view of the water heater 100 according to the second embodiment.

  The water heater 100 according to the second embodiment is a modification of the water heater 1 according to the first embodiment, and includes an air supply fan 65 that is different from the combustion air supply fan 5. A feature of the present invention is that the drain held by the fabric 50 can be vaporized by blowing the air supplied from the air supply fan 65 toward the fabric 50 supported by the fabric support member 45. Therefore, in the following description, members common to the water heater 1 are described with the same reference numerals, and description of structural parts common to the water heater 1 is omitted.

  As shown in FIG. 2, an air supply fan 65 different from the combustion air supply fan 5 is provided outside the combustion chamber 3. A motor 66 is coupled to the air supply fan 65, and the motor 66 is electrically connected to the controller 40. In addition, an air supply pipe 43 is connected to the air supply fan 65, and the downstream end of the air supply pipe 43 is expanded toward the back surface of the fabric 50 supported by the fabric support member 45. A diameter portion 43a is provided. And like the water heater 1 of 1st Embodiment, the fabric 50 is supported so that it may hang from the fabric support member 45 facing the drain exhaust port 20, and the lower end part of the fabric 50 is a drain pan. 17 is in a state of being immersed in the drain accumulated in the interior.

  Next, a method for vaporizing and discharging drain in the water heater 100 will be described. First, similarly to the water heater 1 of the first embodiment, the drain neutralized by the neutralizer 15 is directed to the upper portion of the fabric 50 supported by the fabric support member 45 via the drain exhaust pipe 16. Then dripped. The drain dripped onto the upper portion of the fabric 50 penetrates in the direction of gravity and is finally absorbed by the entire fabric 50. Further, the drain that has not been absorbed by the fabric 50 is stored in the drain tray 17 disposed below the fabric 50. And since the lower end part of the fabric 50 is immersed in the drain collected on the drain receiving tray 17, the drain collected on the drain receiving tray 17 is sucked up again from the lower side of the fabric 50 by capillary action.

  On the other hand, the motor 66 is driven by the control signal output from the controller 40, and the air supply fan 65 is driven. Then, the air supply from the air supply fan 65 passes through the air supply pipe 43 and is supplied from the enlarged diameter portion 43 a of the air supply pipe 43 toward the entire back surface of the fabric 50. As a result, the air supplied from the air supply fan 65 directly hits the entire back surface of the fabric 50, so that the drain absorbed and held by the fabric 50 is vaporized as needed. The vaporized drain is discharged to the outside of the instrument body 2 from the drain exhaust port 20 by the flow of air passing through the plurality of holes formed in the fabric 50. This eliminates the need for a drainage facility for discharging the drain, thus eliminating the need for piping work for the drainage facility. Moreover, since the air supply fan 65 can adjust the ventilation volume by control of the controller 40, the vaporization amount from the fabric 50 can be adjusted freely.

  As described above, in the water heater 100 according to the second embodiment, similar to the water heater 1 according to the first embodiment, the drain generated in the auxiliary heat exchanger 10 is absorbed by the fabric 50 and held. Yes. Then, air supplied from the air supply fan 65 is blown toward the fabric 50 in which the drain is held, whereby the drain held in the fabric 50 can be vaporized and discharged out of the instrument body 2. . This eliminates the need for a drainage facility for discharging the drain, thus eliminating the need for piping work for the drainage facility. Moreover, since not only the fabric 50 is suspended by the fabric support member 45 but also the air supplied from the air supply fan 65 can be blown, the vaporization efficiency of the fabric 50 can be improved.

  Furthermore, the amount of drain vaporization from the fabric 50 can be freely adjusted by adjusting the air supply amount of the air supply fan 65. Further, since the amount of air blown from the air supply fan 65 can be adjusted by the amount of drain generated in the auxiliary heat exchanger 10, it is possible to save power costs.

  Needless to say, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, in the first and second embodiments, the fabric 50 is used as the water absorbing member. However, for example, a synthetic resin (for example, silicon carbide) made of ceramic having high thermal conductivity may be used. In this case, since the thermal conductivity of the water absorbing member is high, the drain can be absorbed and retained, and the temperature of the entire water absorbing member can be made uniform. Thereby, drain can be vaporized from the whole water absorption member. It is also possible to use a water absorbing member in which a synthetic resin made of ceramic and a fabric are combined. In this case, it is preferable that the lower part of the water-absorbing member is made of a fabric to ensure the water absorption performance of the drain.

  Further, although the fabric 50 is disposed so that one surface of the fabric 50 faces the drain exhaust port 20, the fabric 50 may be disposed along a direction orthogonal to the drain exhaust port 20. Furthermore, the fabric 50 is not limited to a single sheet, and for example, a plurality of cloths 50 may be arranged and supported at predetermined intervals. Then, the fabrics 50 are arranged so as to be parallel to the flow of air (the supply air from the combustion air supply fan 5 or the supply air from the supply air fan 65), and the gaps are spaced at predetermined intervals. Air may be allowed to flow through. In this case, since the contact area between the air and the drain (water held by the fabric 50) becomes large, the vaporization efficiency of the drain can be further improved.

  Further, in the above embodiment, the drain generated in the neutralizer 15 is dropped from the drain discharge pipe 16 from the upper part of the fabric 50 fixed to the fabric support member 45 and absorbed in the gravity direction. The drain accumulated in the tray 17 may be sucked up by a pump and sprinkled with a nozzle or the like on the entire fabric 50 to cause the entire fabric 50 to absorb water.

  Alternatively, the drain neutralized by the neutralizer 15 may be supplied to the drain tray 17 and the drain 50 collected in the drain tray 17 may be absorbed by the fabric 50 only by capillary action.

  Further, the upper end of the fabric 50 is supported by being fixed to the fabric support member 45 by the fixture 46. However, the support method for supporting the fabric 50 is not limited to this, and the upper end of the fabric 50 is supported. You may make it fix on both sides of a part.

  In addition, the fabric 50 is suspended in a planar shape by the fabric support member 45. For example, the fabric 50 is supported substantially horizontally in a pleat shape or a zigzag shape, and a part of the fabric 50 is collected in the drain tray 17. It is good also as a state immersed in. Furthermore, it is also possible to employ an arrangement in which an endless (loop) -shaped water-absorbing member is prepared, the lower part is provided so as to be immersed in a drain tray, and the water-absorbing member is rotated by external power.

  The water heater of the present invention can be applied to a water heater that generates drainage in a heat exchanger.

It is side view sectional drawing of the water heater 1 which is 1st Embodiment. It is side view sectional drawing of the water heater 100 which is 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water heater 2 Appliance main body 3 Combustion chamber 5 Combustion air fan 9 Main heat exchanger 9a Main heat transfer pipe 10 Sub heat exchanger 10a Sub heat transfer pipe 17 Drain pan 33 Supply air pipe 45 Fabric support member 50 Fabric 65 Supply air fan 100 Water heater

Claims (7)

A burner for burning fuel gas in a combustion chamber provided in the instrument, a combustion air supply fan for supplying combustion air to the burner, and collecting sensible heat from the combustion gas of the burner to pass through the heat transfer tube. From the main heat exchanger that heats the water and the combustion gas that has passed through the main heat exchanger, in addition to the sensible heat that could not be recovered by the main heat exchanger, latent heat was recovered and water in the heat transfer tube was passed through. A hot water supply comprising a secondary heat exchanger to be heated, a tray that receives drain generated by the recovery of latent heat in the secondary heat exchanger, and a vaporization discharge unit that vaporizes the drain accumulated in the tray and discharges the drain to the outside of the appliance. A vessel,
The vaporizing and discharging means includes
A water-absorbing member that absorbs the drain accumulated in the tray and evaporates naturally;
Support means for immersing and supporting a part of the water absorbing member in the drain accumulated in the tray;
A water heater comprising a blowing means for blowing air toward the water absorbing member.   The hot water supply device according to claim 1, wherein the blower means is a blower fan that sucks outside air and blows air toward the water absorbing member.   The hot water heater according to claim 1, wherein the blower means is a pipe that guides a part of the exhaust of the combustion air supply fan to the water absorbing member.   The water heater according to any one of claims 1 to 3, wherein the water absorbing member is a fabric.   The water heater according to any one of claims 1 to 3, wherein the water absorbing member is a ceramic having high thermal conductivity.   The hot water heater according to any one of claims 1 to 5, wherein the vaporizing / discharging unit includes a drain flowing-down unit that drains the drain from the upper portion of the water-absorbing member to absorb the water. The water heater according to any one of claims 1 to 5, wherein the vaporizing and discharging unit includes a drain watering unit that sprays water toward the water absorbing member to absorb the water.

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