JP2019095105A - Hot water heating device - Google Patents

Abstract

To provide a hot water heating device capable of simplifying construction of piping.SOLUTION: A hot water heating device includes a housing having a first side plate, a second side plate opposed to the first side plate, and a bottom plate connected to the first side plate and the second side plate, a first going pipe header having a plurality of first pipe connection ports arranged along a first direction as a direction from the first side plate toward the second side plate, a second going pipe header having a plurality of second pipe connection ports disposed on the bottom plate and arranged along the first direction, and a return pipe header disposed on the bottom plate, and having a plurality of third pipe connection ports arranged along the first direction. The first pipe connection port on a closest position from the first side plate is positioned at a second side plate side with respect to the second pipe connection port on a position separating most from the first side plate.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hot water heater.

  Conventionally, for example, a gas hot water heating bath-type water heater described in Non-Patent Document 1 (Noritsu, gas hot water heating system general catalog, page 34, August 2017) is known.

  The gas water heater with heating water heater according to Non-Patent Document 1 has a housing, a first forward piping header, a second forward piping header, and a return piping header. The housing has a first side plate, a second side plate, and a bottom plate. The first side plate and the second side plate face each other. The first forward piping header, the second forward piping header, and the return piping header are disposed on the bottom plate.

  The first forward piping header has a plurality of first piping connection ports. The second forward pipe header has a plurality of second pipe connection ports. The return pipe header has a plurality of third pipe connection ports. The first pipe connection port and the second pipe connection port are connected to the third pipe connection port via the pipe. That is, the hot and cold water supplied to the first forward piping header and the second forward piping connection port returns to the return piping header after performing the heating operation at the heating terminals disposed in the respective rooms.

  In addition, the compound heat source machine of patent 3928549 (patent document 1) is known as another prior art example.

Patent No. 3928549 gazette

Noritz Co., Ltd., Gas Hot Water Heating System General Catalog, page 34, August 2017

  However, in the bath water heater with gas hot water heating described in Non-Patent Document 1, when connecting the first pipe connection port, the second pipe connection port, and the third pipe connection port by pipes, the respective pipes cross each other. There is a risk of As a result, in the bath water heater with gas hot water heating described in Non-Patent Document 1, there is a possibility that installation of piping may be complicated.

  The present invention has been made in view of the problems of the prior art as described above. More specifically, the present invention provides a hot water heating apparatus capable of facilitating the installation of piping.

  A hot water heating apparatus according to an aspect of the present invention is disposed in a bottom plate, a casing having a first side plate, a second side plate facing the first side plate, a first side plate and a bottom plate connected to the second side plate, And a first forward piping header having a plurality of first pipe connection ports arranged along a first direction which is a direction from the first side plate to the second side plate, and disposed on the bottom plate and along the first direction A second forward pipe header having a plurality of arranged second pipe connection ports, and a return pipe header having a plurality of third pipe connection ports arranged on the bottom plate and arranged along the first direction. The first pipe connection port located closest to the first side plate is closer to the second side board than the second pipe connection port located far from the first side plate.

  In the above-described water heater, the return pipe header may be disposed between the first forward pipe header and the second forward pipe header.

  In the above-described hot water heating apparatus, each of the first pipe connection ports may be disposed linearly. Each of the second pipe connection ports may be arranged linearly. Each of the third pipe connection ports may be arranged linearly.

  In the above-described water heater, the distance between adjacent first pipe connection openings, the distance between adjacent second pipe connection openings, and the distance between adjacent third pipe connection openings may be equal to each other. .

  In the hot water heating apparatus described above, the straight line connecting the centers of the adjacent first and third pipe connection ports may be orthogonal to the straight line connecting the centers of the third pipe connection port. The straight line connecting the centers of the adjacent second pipe connection and third pipe connection may be orthogonal to the straight line connecting the centers of the third pipe connection.

  In the above-described hot water heating apparatus, the extension allowance of the first pipe connection from the bottom plate, the extension allowance of the second pipe connection from the bottom, and the protrusion allowance of the third pipe connection from the bottom are equal to each other. May be

  In the above-described water heater, the first forward piping header, the second forward piping header, and the return piping header may each be formed of an integral member.

  In the above-described hot water heating apparatus, the temperature of hot water supplied to the first forward piping header may be lower than the temperature of hot water supplied to the second forward piping header. In the above-described hot water heating apparatus, the temperature of hot water supplied to the first forward piping header may be higher than the temperature of hot water supplied to the second forward piping header.

  In the hot water heating apparatus according to one aspect of the present invention, the first pipe connection port located closest to the first side plate is closer to the second side board than the second pipe connection port located farther from the first side plate. Since there exists, the piping which connects a 1st piping connection port and a 3rd piping connection port does not cross easily the piping which connects a 2nd piping connection port and a 3rd piping connection port. Therefore, in this case, the installation of the pipe can be facilitated.

FIG. 1 is a schematic view of a hot water heating apparatus 100 according to a first embodiment. FIG. 1 is a perspective view of a hot water heating device 100 according to a first embodiment. FIG. 2 is a bottom view of the hot water heating device 100 according to the first embodiment. It is a cross-sectional schematic diagram of the forward piping header 6a in the hot water heating apparatus 100 which concerns on Embodiment 1. FIG. It is a cross-sectional schematic diagram of the forward piping header 6b in the hot water heating apparatus 100 which concerns on Embodiment 1. FIG. It is a cross-sectional schematic diagram of the return piping header 7 in the hot water heating apparatus 100 which concerns on Embodiment 1. FIG. FIG. 1 is a schematic side view of a hot water heating apparatus 100 according to a first embodiment. It is a bottom view of warm water heating system 200 concerning a comparative example. FIG. 6 is a bottom view of a hot water heating device 110 according to a second embodiment. It is a cross-sectional schematic diagram of the forward piping header 6a in the hot water heating apparatus 110 which concerns on Embodiment 2. FIG.

  The details of the embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts will be denoted by the same reference numerals, and overlapping descriptions will not be repeated.

(Hot water heater according to the first embodiment)
The configuration of the hot water heating apparatus 100 according to the first embodiment will be described below.

  As shown in FIG. 1, the hot water heating apparatus 100 according to the first embodiment includes a primary heat exchanger 1a, a secondary heat exchanger 1b, a burner 2, a pipe 3a, a pipe 3b, a pipe 3c, and a pipe 3d, piping 3e, piping 3f, tank 4, pump 5, forward piping header 6a, forward piping header 6b, and return piping header 7.

  One end of the pipe 3a is connected to a portion where one end of the pipe 3b and one end of the pipe 3c are connected. The other end of the pipe 3 a is connected to the tank 4. The other end of the pipe 3b is connected to the primary heat exchanger 1a.

  The other end of the pipe 3c is connected to the forward pipe header 6a. One end of the pipe 3d is connected to the primary heat exchanger 1a. The other end of the pipe 3d is connected to the forward pipe header 6b.

  One end of the pipe 3 e is connected to the return pipe header 7. The other end of the pipe 3e is connected to the secondary heat exchanger 1b. One end of the pipe 3 f is connected to the secondary heat exchanger 1 b. The other end of the pipe 3 f is connected to the tank 4. The pump 5 is disposed on the path of the pipe 3a. The burner 2 is disposed in the vicinity of the primary heat exchanger 1a.

  The operation of the hot water heating apparatus 100 according to the first embodiment is as follows. That is, the water supplied from the waterworks and stored in the tank 4 is supplied by the pump 5 to the primary heat exchanger 1 a via the pipe 3 a and the pipe 3 b. The water supplied to the primary heat exchanger 1 a becomes hot water by heat exchange with the burner 2. This hot water is supplied to the forward piping header 6b through the piping 3d.

  The hot water supplied to the forward piping header 6b is distributed to the plurality of pipes 3g in the forward piping header 6b and is supplied to the plurality of hot water heating terminals 8a (high temperature heating terminals). The temperature of the hot water supplied to the plurality of hot water heating terminals 8a is lowered by performing the heating operation. Hot and cold water supplied to the plurality of hot water heating terminals 8a is supplied to the return pipe header 7 through the plurality of pipes 3h.

  The hot water supplied to the return piping header 7 is supplied to the secondary heat exchanger 1b via the piping 3e. The temperature of the hot water supplied to the secondary heat exchanger 1 b is increased by heat exchange with the residual heat of the burner 2. The hot water whose temperature has risen returns to the tank 4 through the pipe 3f.

  The hot water stored in the tank 4 is supplied by the pump 5 to the forward piping header 6 a via the piping 3 a and the piping 3 c. Therefore, the temperature of the hot water supplied to the forward piping header 6a is lower than the temperature of the hot water supplied to the forward piping header 6b.

  The hot water supplied to the forward piping header 6a is distributed to the plurality of pipes 3i in the forward piping header 6a and supplied to the plurality of hot water heating terminals (low-temperature heating terminals) 8b. The temperature of the hot water supplied to the plurality of hot water heating terminals 8b is lowered by performing the heating operation. The hot water supplied to the plurality of hot water heating terminals 8b is supplied to the return pipe header 7 through the plurality of pipes 3j.

  As shown in FIG. 2, the hot water heating apparatus 100 according to the first embodiment has a housing 10. Although not shown, inside the casing 10, the primary heat exchanger 1a, the secondary heat exchanger 1b, the burner 2, the piping 3a, the piping 3b, the piping 3c, the piping 3d, the piping 3e, the piping 3f, the tank 4 And the pump 5 are accommodated.

  The housing 10 includes a first side plate 11, a second side plate 12, a third side plate 13, a fourth side plate 14, a bottom plate 15, and a top plate 16. The second side plate 12 faces the first side plate 11. Hereinafter, the direction from the first side plate 11 to the second side plate 12 is referred to as a first direction DR1. The fourth side plate 14 faces the third side plate 13. The third side plate 13 and the fourth side plate 14 are continuous with the first side plate 11 and the second side plate 12.

  As shown in FIG. 3, the forward piping header 6 a, the forward piping header 6 b and the return piping header 7 are disposed on the bottom plate 15. The return piping header 7 is disposed between the forward piping header 6a and the forward piping header 6b in a second direction DR2 intersecting the first direction DR1.

  The forward piping header 6a has a plurality of piping connection ports 6aa. The number of pipe connection ports 6aa is, for example, six. However, the number of pipe connection ports 6aa is not limited to this. The pipe connection port 6aa is disposed along the first direction DR1. Preferably, the pipe connection port 6aa is disposed linearly along the first direction.

  The forward piping header 6b has a plurality of piping connection ports 6ba. The number of pipe connection ports 6ba is, for example, four. However, the number of pipe connection ports 6ba is not limited to this. The pipe connection port 6ba is disposed along the first direction DR1. Preferably, the pipe connection port 6ba is disposed linearly along the first direction DR1.

  The return pipe header 7 has a plurality of pipe connection ports 7a. The number of pipe connection ports 7a is equal to the total number of pipe connection ports 6aa and pipe connection ports 6ba. However, the number of pipe connection ports 7a is not limited to this. The number of pipe connection ports 7a may be equal to or more than the total number of pipe connection ports 6aa and pipe connection ports 6ba. The pipe connection port 7a is disposed along the first direction DR1. Preferably, the pipe connection port 7a is disposed linearly along the first direction DR1.

  The pipe connection port 6 aa and the pipe connection port 7 a having the same order of proximity from the second side plate 12 are connected to each other. Specifically, the pipe connection port 6aa closest to the second side plate 12 is connected to the pipe connection port 7a closest to the second side plate 12, and the pipe connection port 6aa second to the second side plate 12 is second to the second It is connected to the pipe connection port 7a near the two side plates 12, and the same applies to the following order. Such connection is shown by the dotted lines in FIG.

  The pipe connection port 6 ba and the pipe connection port 7 a having the same order of proximity from the first side plate 11 are connected to each other. Specifically, the pipe connection port 6 ba closest to the first side plate 11 is connected to the pipe connection port 7 a closest to the first side plate 11, and the pipe connection port 6 ba closest to the first side plate 11 is second It is connected to the pipe connection port 7a close to the 1 side plate 11, and the same applies to the following order. Such connection is shown by the dotted lines in FIG.

  The pipe connection port 6 aa located closest to the first side plate 11 is closer to the second side plate 12 than the pipe connection port 6 ba located far from the first side plate 11. From another point of view, in the first direction DR1, the plurality of pipe connection ports 6aa provided in the forward pipe header 6a and the plurality of pipe connection ports 6ba provided in the forward pipe header 6b are They are arranged so as not to overlap each other.

  As shown in FIG. 4, the forward piping header 6a has a first portion 6ab, a second portion 6ac, and a connecting portion 6ad. The connecting portion 6 ad connects the first portion 6 ab and the second portion 6 ac.

  The first portion 6ab has a structure in which a plurality of thermal valves 6aba are connected. The thermal valve 6aba controls the flow and stop of hot and cold water to the pipe connection port 6aa. The second portion 6ac has the same configuration as the first portion 6ab. That is, the second portion 6ac has a structure in which a plurality of thermal valves 6aca are connected. A flow path 6ada is provided in the inside of the connection portion 6ad. The flow path 6ada is connected to the pipe 3c. The flow passage 6ada is in communication with the pipe connection port 6aa via the thermal valve 6aba and the thermal valve 6aca.

  As shown in FIG. 5, the forward piping header 6b has a main body 6bb. A flow path 6bc is provided in the inside of the main body 6bb. The flow path 6bc is in communication with the pipe connection port 6ba. The flow path 6 bc is connected to the pipe 3 d. The main body 6bb is configured integrally with the pipe connection port 6ba. That is, the forward piping header 6b is comprised by the integral member.

  As shown in FIG. 6, the return pipe header 7 has a main body 7b. The flow path 7c is provided in the inside of the main body 7b. The flow path 7c is in communication with the pipe connection port 7a. The flow path 7b is connected to the pipe 3e. The main body 7 b is integrally formed with the pipe connection port 7 a. That is, the return piping header 7 is formed of an integral member. The return pipe header 7 may be covered by the heat insulating member 7 d.

  As shown in FIG. 7, the pipe connection port 6 aa, the pipe connection port 6 ba, and the pipe connection port 7 a protrude from the bottom plate 15. The projection allowance of the pipe connection port 6aa, the projection allowance of the pipe connection port 6ba, and the projection allowance of the pipe connection port 7a are equal to one another. The projection allowance of the pipe connection port 6aa (the projection allowance of the pipe connection port 6ba, the projection allowance of the pipe connection port 7a) is the tip of the pipe connection port 6aa (the tip of the pipe connection port 6ba, the tip of the pipe connection port 7a ) And the bottom plate 15.

  The phrase “protrusion allowance of piping connection port 6aa, projection allowance of piping connection opening 6ba and projection allowance of piping connection opening 7a are equal to each other” means the projection allowance of piping connection opening 6aa, the projection of piping connection opening 6ba It means that all the outset allowances of the space | interval and the piping connection port 7a exist in the range of +/- 5%.

  Below, the effect of the hot water heating apparatus 100 which concerns on Embodiment 1 is demonstrated, comparing with a comparative example.

  As shown in FIG. 8, the hot water heating apparatus 200 according to the comparative example is, like the hot water heating apparatus 100 according to the first embodiment, a forward pipe header 6 a provided with a plurality of pipe connection ports 6 aa and a plurality of pipe connections It has a forward piping header 6b provided with a port 6ba and a return piping header 7 provided with a plurality of piping connection ports 7a.

  However, in the hot water heating apparatus 200 according to the comparative example, the pipe connection port 6aa located closest to the first side plate 11 is closer to the first side plate 11 than the pipe connection port 6ba located farthest from the first side plate. is there. Therefore, as shown by dotted lines in FIG. 8, when connecting the pipe connection port 6 aa and the pipe connection port 6 ba with the pipe connection port 7 a by piping, there is a possibility that the respective pipes cross each other.

  On the other hand, in the hot water heating apparatus 100 according to the embodiment, the pipe connection port 6aa located closest to the first side plate 11 is closer to the second side plate 12 than the pipe connection port 6ba located farthest from the first side plate. is there. Therefore, as shown by dotted lines in FIG. 3, when connecting the pipe connection port 6 aa and the pipe connection port 6 ba with the pipe connection port 7 a by pipes, it is difficult for the respective pipes to cross each other. Therefore, according to the hot water heating apparatus 100 which concerns on embodiment, it becomes possible to perform construction of piping easily.

  When the projection allowance of the pipe connection port 6aa, the projection allowance of the pipe connection port 6ba, and the projection allowance of the pipe connection port 7a are equal to one another, the piping is attached to the pipe connection port 6aa, the pipe connection port 6ba, and the pipe connection port 7a. It can be done more easily.

(Hot water heating device according to the second embodiment)
The configuration of the hot water heating apparatus 110 according to the second embodiment will be described below. In the following, points different from the configuration of hot water heating apparatus 100 according to the first embodiment will be mainly described, and overlapping description will not be repeated.

  The hot water heating apparatus 110 according to the second embodiment includes a primary heat exchanger 1a, a secondary heat exchanger 1b, a burner 2, a pipe 3a, a pipe 3b, a pipe 3c, a pipe 3d, and a pipe 3e. It has piping 3f, tank 4, pump 5, forward piping header 6a, forward piping header 6b, and return piping header 7.

  The forward piping header 6a has a plurality of piping connection ports 6aa. The pipe connection ports 6aa are arranged along the first direction DR1. The pipe connection port 6aa is preferably arranged in a straight line along the first direction DR1.

  The forward piping header 6b has a plurality of piping connection ports 6ba. The pipe connection ports 6ba are arranged along the first direction DR1. It is preferable that the pipe connection port 6ba be disposed linearly along the first direction DR1.

  The return pipe header 7 has a plurality of pipe connection ports 7a. The pipe connection ports 7a are arranged along the first direction DR1. It is preferable that the pipe connection port 7a be disposed linearly along the first direction DR1.

  The return pipe header is preferably disposed between the forward pipe header 6a and the forward pipe header 6b. It is preferable that the projection allowance of the pipe connection port 6 aa from the bottom plate 15, the projection allowance of the pipe connection port 6 ba from the bottom plate 15, and the projection allowance of the pipe connection port 7 a from the bottom plate 15 be equal to each other.

  Regarding the above points, the configuration of the hot water heating apparatus 110 according to the second embodiment is common to the configuration of the hot water heating apparatus 100 according to the first embodiment. However, regarding the details of the arrangement of the pipe connection port 6aa, the pipe connection port 6ba, and the pipe connection port 7a, the configuration of the hot water heating device 110 according to the second embodiment is different from the configuration of the hot water heating device 100 according to the first embodiment. . Below, this difference is explained in full detail.

  As shown in FIG. 9, the pipe connection port 6 ba located closest to the first side plate 11 is closer to the second side plate 12 than the pipe connection port 6 aa located farthest from the first side plate 11.

  The pipe connection port 6 aa and the pipe connection port 7 a having the same order of proximity from the first side plate 11 are connected to each other. More specifically, the pipe connection port 6aa closest to the first side plate 11 is connected to the pipe connection port 7a closest to the first side plate 11, and the pipe connection port 6aa closest to the first side plate 11 is second It is connected to the pipe connection port 7a close to the first side plate 11, and the same applies to the following order.

  The pipe connection port 6 ba and the pipe connection port 7 a having the same order of proximity from the second side plate 12 are connected to each other. More specifically, the pipe connection port 6ba closest to the second side plate 12 is connected to the pipe connection port 7a closest to the second side plate 12, and the pipe connection port 6ba closest to the second side plate 12 is second It is connected to the pipe connection port 7a close to the second side plate 12, and the same applies to the following order.

  The pipe connection ports 6aa are preferably arranged at equal intervals along the first direction DR1. The pipe connection ports 6ba arranged adjacent to each other are preferably arranged at equal intervals along the first direction DR1. The pipe connection openings 7a are preferably arranged at equal intervals along the first direction DR1.

  The distance between the adjacent pipe connection ports 6aa is a distance D1. The distance between the pipe connection ports 6ba arranged adjacent to each other is a distance D2. The distance between the adjacent pipe connection ports 7a is a distance D3. Preferably, the distances D1, D2 and D3 are equal to one another. "The distance D1, the distance D2 and the distance D3 are equal to each other" means that the distances D1, D2 and D3 are all within the range of ± 5%.

  A straight line connecting the centers of the adjacent pipe connection ports 7a is taken as a straight line L1. A straight line connecting the centers of the adjacent pipe connection port 6aa and the pipe connection port 7a is taken as a straight line L2. A straight line connecting the centers of the adjacent pipe connection port 7a and pipe connection port 6ba is taken as a straight line L3. The straight line L1, the straight line L2 and the straight line L3 are shown by dotted lines in FIG. Preferably, the straight line L2 is orthogonal to the straight line L1. Preferably, the straight line L3 is orthogonal to the straight line L1.

  “The straight line L2 and the straight line L1 are orthogonal to each other” means that the angle formed by the straight line L2 and the straight line L1 is in the range of 90 ° ± 5 °. “The straight line L3 and the straight line L1 are orthogonal to each other” means that the angle between the straight line L3 and the straight line L1 is in the range of 90 ° ± 5 °.

  As shown in FIG. 10, the forward piping header 6a has a structure in which the same number of thermal valves 6ae are connected to the pipe connection port 6aa. That is, the forward piping header 6a is configured by an integral member. Moreover, the forward piping header 6a can arrange piping connection port 6aa at equal intervals by setting it as the structure where thermal valve 6ae of the same number was connected with piping connection port 6aa.

  The effects of the hot water heating apparatus 110 according to the second embodiment will be described below. In the following, points different from the effects of the hot water heating apparatus 100 according to the first embodiment will be mainly described, and overlapping description will not be repeated.

  In the hot water heating apparatus 110 according to the second embodiment, when the distance D1, the distance D2 and the distance D3 are equal to one another, all the pipes for connecting the pipe connection port 6aa and the pipe connection port 7a become parallel, and the pipe connection port 6ba The pipes for connecting the pipe and the pipe connection port 7a are all parallel. Therefore, in this case, the pipes are less likely to cross each other.

  In the hot water heating apparatus 110 according to Embodiment 2, when the straight line L2 is orthogonal to the straight line L1 and the straight line L3 is orthogonal to the straight line L1, piping for connecting the piping connection port 6aa and the piping connection port 7a And all the piping for connecting the piping connection port 6ba and the piping connection port 7a become parallel. Therefore, in this case, the pipes are less likely to cross each other.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is indicated not by the embodiments described above but by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

  The above embodiments apply particularly advantageously to a hot water heater.

  1a, 1b Heat exchanger, 2 burners, 3a, 3b, 3c, 3e, 3f, 3g, 3h, 3i, 3j Piping, 4 tanks, 5 pumps, 6a outgoing piping header, 6aa piping connection, 6ab first Part, 6aba thermal valve, 6ac second part, 6aca thermal valve, 6ad connecting part, 6ada channel, 6ae thermal valve, 6b forward piping header, 6ba piping connection port, 6bb main body, 6bc channel, 7 return Piping header 7a piping connection port 7b main body 7c flow path 7d heat insulating member 8a, 8b hot water heating terminal 10 housing 11 first side plate 12 second side plate 13 third side plate 14 fourth side plate , 15 bottom plate, 16 top plate, 100, 110, 200 hot water heater, D1, D2, D3 distance, DR1 first direction, DR2 second direction, L1, L2, L3 straight line.

Claims (9)

A housing having a first side plate, a second side plate facing the first side plate, and a bottom plate connected to the first side plate and the second side plate;
A first forward piping header having a plurality of first piping connection ports disposed on the bottom plate and arranged along a first direction which is a direction from the first side plate to the second side plate;
A second forward pipe header having a plurality of second pipe connection ports disposed on the bottom plate and arranged along the first direction;
A return pipe header disposed on the bottom plate and having a plurality of third pipe connection ports arranged along the first direction;
The hot water heating apparatus according to claim 1, wherein the first pipe connection port located closest to the first side plate is closer to the second side board than the second pipe connection port located far from the first side plate.   The hot water heating apparatus according to claim 1, wherein the return pipe header is disposed between the first forward pipe header and the second forward pipe header. Each of the first pipe connection ports is linearly arranged,
Each of the second pipe connection ports is linearly arranged,
The hot water heating apparatus according to claim 2, wherein each of the third pipe connection ports is linearly arranged.   The hot water according to claim 3, wherein the distance between the adjacent first pipe connection ports, the distance between the adjacent second pipe connection ports, and the distance between the adjacent third pipe connection ports are equal to each other. Heating system. The straight line connecting the centers of the adjacent first pipe connection and the third pipe connection is orthogonal to the straight line connecting the centers of the third pipe connection,
The hot water heating apparatus according to claim 4, wherein the straight line connecting the centers of the adjacent second pipe connection and the third pipe connection is orthogonal to the straight line connecting the centers of the third pipe connection. .   A protrusion margin of the first pipe connection from the bottom plate, a protrusion margin of the second pipe connection from the bottom plate, and a protrusion margin of the third pipe connection from the bottom plate are equal to each other. The hot water heating apparatus of any one of Claims 1-5.   The hot water heating apparatus according to any one of claims 1 to 6, wherein the first forward piping header, the second forward piping header, and the return piping header are each formed of an integral member.   The hot water heating apparatus according to any one of claims 1 to 7, wherein the temperature of the hot water supplied to the first forward piping header is lower than the temperature of the hot water supplied to the second forward piping header. .   The hot water heating apparatus according to any one of claims 1 to 7, wherein the temperature of the hot water supplied to the first forward piping header is higher than the temperature of the hot water supplied to the second forward piping header. .

Images