Hot water supply heater

Abstract

To install a heating tank without interfering with pipelines.SOLUTION: A secondary heat exchanger 200 includes an inlet of a heat absorption pipe, and an outlet of the heat absorption pipe. At the inlet of the heat absorption pipe, a heating return pipe 32 is connected which is connected to a heating return port of a bottom plate part 3B1, and at the outlet of the heat absorption pipe, an intermediate pipeline 35 connected to a heating tank 69 is connected. The heating return pipe 32 includes: a return pipe side rear extension part extending backward from the inlet of the heat absorption pipe; and a return pipe side downward extension part extending downward from a the return pipe side rear extension part. The intermediate pipeline 35 includes: an intermediate pipeline side rear extension part extending backward from the outlet of the heat absorption pipe; and an intermediate pipeline side downward extension part extending downward from the intermediate pipeline side rear extension part. The return pipe side rear extension part and the intermediate pipeline side rear extension part are arranged above the heating tank 69, and the return pipe side downward extension part and the intermediate pipeline side downward extension part are disposed so as to be along a back surface wall 3B5 of a housing 3 and so as to overlap with each other in a side view.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a hot water heater. [Background technology]

[0002] A water heater described in Japanese Patent Laid-Open No. 2021-32543 (Patent Document 1 below) is known. The water heater described in Patent Document 1 includes a primary heat exchanger that recovers sensible heat from combustion exhaust gas, a secondary heat exchanger that is disposed above the primary heat exchanger and that recovers latent heat from the combustion exhaust gas and has a drain outlet formed therein for discharging drain generated as a result of the recovery of the latent heat, and a drain hose connected to the drain outlet. The primary heat exchanger includes a can body whose interior is divided into left and right sections by a partition, and two primary heat exchangers that are disposed adjacent to each other in the left-right direction within the can body, with the partition sandwiched between them. The front end of the secondary heat exchanger is disposed in a form that protrudes forward beyond the front surface of the can body. The drain outlet is formed below the front end of the secondary heat exchanger and at a position corresponding to the partition of the primary heat exchanger in the left-right direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-32543 Summary of the Invention [Problem to be solved by the invention]

[0004] In the water heater described above, the drain hose is connected to the neutralizer at the end opposite the drain outlet. To avoid interference between the drain hose and other components within the water heater or heat damage caused by contact with those components, the drain hose is bent to bypass those components while connecting the drain outlet and the neutralizer. In other words, the drain hose does not connect the drain outlet and the neutralizer in a straight line via the shortest possible route. For example, a portion of the drain hose is arranged at a shallow downward incline relative to the horizontal. Therefore, when attaching the drain hose to the drain outlet, depending on the attachment angle of the drain hose relative to the drain outlet, the shallow downward incline portion of the drain hose may be arranged at an upward incline, or the drain hose may interfere with other components, making it difficult to properly position the drain hose within the water heater.

[0005] Furthermore, the above-mentioned problem is not limited to drain hoses, but applies to all flexible hoses used in water heaters. [Means for solving the problem]

[0006] The water heater of the present disclosure comprises an attachment member having an attachment port and a flexible hose having an end attached to the attachment port, the flexible hose having a visible identification mark at the end, and when the flexible hose is attached at a suitable attachment angle to the attachment port, the identification mark is arranged facing forward. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a water heater that can recognize the preferred attachment angle of a flexible hose. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view of a hot water heater according to an embodiment. [Figure 2] FIG. 2 is an enlarged perspective view of the inner body as seen from the front right. [Figure 3]FIG. 3 is a right side view of the inner barrel. [Figure 4] FIG. 4 is a left side view of the inner barrel. [Figure 5] FIG. 5 is an enlarged perspective view of the inner body as seen from the front left. [Figure 6] FIG. 6 is an enlarged perspective view of the inner body showing the positioning member and the gently sloping portion of the drain hose. [Figure 7] FIG. 7 is a perspective view of the positioning member. [Figure 8] FIG. 8 is a schematic circuit diagram of the hot water heater. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described.

[0010] (1) The water heater of the present disclosure comprises an attachment member having an attachment port and a flexible hose having an end attached to the attachment port, the flexible hose having a visible identification mark at the end, and when the flexible hose is attached at a suitable attachment angle to the attachment port, the identification mark is arranged facing forward.

[0011] With this configuration, a worker who attaches the flexible hose to the attachment port can use the identification mark as a guide to attach the flexible hose to the attachment port at a suitable attachment angle, thereby stabilizing the posture of the flexible hose and positioning the flexible hose in an appropriate position within the water heater.

[0012] (2) In the water heater described in (1), the mounting member may be a secondary heat exchange device that recovers latent heat of combustion exhaust, and the flexible hose may be a drain hose.

[0013] (3) In the water heater described in (1), the attachment member may be a heating tank provided in a circulation circuit through which a liquid circulates, and the flexible hose may be an overflow hose.

[0014] [Details of the embodiments of the present disclosure] Embodiments of the present disclosure will be described with reference to Figures 1 to 8. The present disclosure is not limited to these examples, but is defined by the scope of the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0015] [Overall structure of the hot water heater] The hot water heater 1 (an example of a hot water heater) of this embodiment has both a hot water supply function of heating supplied tap water and supplying hot water to the outside, and a heating function of supplying hot water to a radiator installed indoors or under the floor to heat the room or floor. In detail, the hot water heater 1 has a hot water supply circuit A, a heating circuit B (an example of a circulation circuit), and a bath circuit C.

[0016] 1, the hot water heater / room heater 1 includes a housing 3, an inner body 2 housed within the housing 3, a heating tank 69, a controller 80, etc. The housing 3 includes a box-shaped housing main body 3B having an opening 3A on the front side, and a front cover (not shown) that closes the opening 3A of the housing main body 3B. The housing main body 3B includes a bottom plate 3B1 located on the lower side when viewed from the front, a left side plate 3B2 located on the left side when viewed from the front, a right side plate 3B3 located on the right side when viewed from the front, a top plate 3B4 located on the upper side when viewed from the front, and a rear wall 3B5 located on the rear side.

[0017] As shown in FIGS. 1 to 3 , the inner body 2 includes a primary heat exchanger 100, a secondary heat exchanger 200 (an example of a mounting member), a burner device 300, and an exhaust hood 400. As shown in FIG. 8 , the primary heat exchanger 100 includes two heat exchangers: a hot water supply primary heat exchanger 110 and a heating primary heat exchanger 120. The secondary heat exchanger 200 is disposed above the primary heat exchanger 100. The secondary heat exchanger 200 includes two heat exchangers: a hot water supply secondary heat exchanger 210 and a heating secondary heat exchanger 220. The hot water supply secondary heat exchanger 210 is connected to the upstream side of the hot water supply primary heat exchanger 110 in the water flow path (hot water supply circuit A). The heating secondary heat exchanger 220 is connected to the upstream side of the heating primary heat exchanger 120 in the water flow path (heating circuit B). The burner device 300 is connected to the lower part of the primary heat exchanger 100. The burner device 300 includes a burner case 330 (see FIGS. 2 and 3), and a hot water supply burner group 310 and a heating burner group 320 arranged inside the burner case 330.

[0018] As shown in FIG. 3 , exhaust hood 400 has a lower end connected to primary heat exchanger 100 and an upper end connected to secondary heat exchanger 200. Exhaust hood 400 forms a path for sending the combustion exhaust gas discharged from primary heat exchanger 100 into secondary heat exchanger 200. As shown in FIG. 8 , inner body 2 is divided into left and right halves, with hot water burner group 310, hot water primary heat exchanger 110, and hot water secondary heat exchanger 210 provided on the right side, and heating burner group 320, heating primary heat exchanger 120, and heating secondary heat exchanger 220 provided on the left side. Hot water heater 1 functions to recover sensible heat from the combustion exhaust gas using primary heat exchanger 100. Hot water heater 1 also functions to recover latent heat from the combustion exhaust gas using secondary heat exchanger 200.

[0019] Burner device 300 burns gas together with combustion air to generate combustion exhaust. Burner device 300 includes a hot water supply burner group 310 and a heating burner group 320 arranged side by side in the left-right direction. Hot water supply burner group 310 is disposed below hot water supply primary heat exchanger 110. Heating burner group 320 is disposed below heating primary heat exchanger 120. Hot water supply burner group 310 generates combustion exhaust to be supplied to hot water supply primary heat exchanger 110 and hot water supply secondary heat exchanger 210. Heating burner group 320 generates combustion exhaust to be supplied to heating primary heat exchanger 120 and heating secondary heat exchanger 220. Spark plugs 8 and flame rods 9 are provided in the spaces above each burner group 310, 320. Combustion fans 10 are provided in the lower part of inner body 2 to supply combustion air to each burner group 310, 320.

[0020] A gas pipe 17, to which an external gas pipe is connected, is connected to a gas inlet provided on the bottom plate portion 3B1 of the housing 3. Gas branch pipes 18, 18... branching from the gas pipe 17 are connected to each burner group 310, 320, and each gas branch pipe 18 is provided with a gas solenoid valve 19 for opening and closing the gas flow path. In addition, a main gas solenoid valve 20 and a gas proportional valve 21 are provided, from upstream, on the gas pipe 17 before branching.

[0021] The primary heat exchange device 100 includes a water heater body 130 (see FIGS. 2 and 3), a hot water supply primary heat exchanger 110, and a heating primary heat exchanger 120. As shown in FIG. 2, the water heater body 130 has a generally rectangular shape in plan view that is long in the left-right direction, and is formed into a rectangular tubular shape that is perforated vertically. The lower part of the water heater body 130 is connected to a burner case 330. The upper part of the water heater body 130 is connected to an exhaust hood 400. The hot water supply primary heat exchanger 110 and the heating primary heat exchanger 120 are each composed of heat transfer tubes that are formed continuously in a serpentine shape. The heat transfer tubes pass through the inside of the water heater body 130 and are fixed to the water heater body 130 in a form that penetrates the front and rear walls of the water heater body 130.

[0022] The secondary heat exchange device 200 includes a casing 230 (see FIGS. 2 and 3), a hot water supply secondary heat exchanger 210 (see FIG. 8), and a heating secondary heat exchanger 220 (see FIG. 8). As shown in FIG. 2, the casing 230 is formed in the shape of a box that is long in the left-right direction. As shown in FIG. 3, the rear of the casing 230 is connected to an exhaust hood 400. An exhaust pipe 231 that discharges the combustion exhaust gas that has passed through each of the secondary heat exchangers 210, 220 is formed on the front of the casing 230. The hot water supply secondary heat exchanger 210 and the heating secondary heat exchanger 220 each include a heat absorption pipe that is formed continuously in a serpentine shape. The heat absorption pipe is arranged inside the casing 230.

[0023] 3, the casing 230 is disposed such that its bottom surface slopes downward toward the front. The front end of the casing 230 is provided to overhang forward of the front surface of the boiler body 130 of the primary heat exchanger 100. A drain outlet 232 (an example of an attachment port) is provided on the underside of this overhanging portion, and a drain hose 65 (an example of a flexible hose) is connected to the drain outlet 232.

[0024] As shown in Fig. 8, a water supply pipe 22, which is connected to the water inlet of the bottom plate portion 3B1, is connected to the inlet of the heat absorption pipe of the hot water secondary heat exchanger 210. From the upstream side, the water supply pipe 22 is provided with a strainer 23 equipped with a drain plug, a hot water supply water volume sensor 24 for detecting the volume of water flowing through the water supply pipe 22, a hot water supply water inlet thermistor 25 for detecting the inlet water temperature, and a water volume control valve 26 for controlling the volume of water flowing through the water supply pipe 22. The outlet of the heat absorption pipe is connected to the inlet of a heat transfer pipe of the hot water supply primary heat exchanger 110, and the outlet of the heat transfer pipe is connected to a hot water outlet pipe 27, which is connected to the hot water outlet of the bottom plate portion 3B1. The hot water outlet pipe 27 is provided with a hot water heat exchanger thermistor 28 for detecting the outlet temperature from the hot water primary heat exchanger 110, and a hot water outlet thermistor 29 for detecting the outlet temperature of hot water from the appliance downstream of the hot water heat exchanger thermistor 28. A bypass pipe 30 that bypasses the hot water primary heat exchanger 110 and the hot water secondary heat exchanger 210 is connected between the upstream side of the hot water outlet thermistor 29 in the hot water outlet pipe 27 and the downstream side of the water volume control valve 26 in the water supply pipe 22, and a water distribution valve 31 that controls the bypass flow rate is provided in the bypass pipe 30.

[0025] In this way, a hot water circuit A is formed within the housing 3, in which water from the water supply pipe 22 passes through the hot water secondary heat exchanger 210 and the hot water primary heat exchanger 110 in that order, where it is heated by heat exchange with the combustion exhaust from the hot water burner group 310, and then discharged from the hot water outlet pipe 27.

[0026] On the other hand, a heating return pipe 32, which is connected to a heating return port of the bottom plate portion 3B1, is connected to the inlet of the heat absorption pipe of the heating secondary heat exchanger 220. The heating return port is connected to the downstream ends of pipes extending from a high-temperature radiator 33 and a low-temperature radiator 34 outside the hot water heater / heater 1. The high-temperature radiator 33 is, for example, a heating fan that blows warm air into the room. The low-temperature radiator 34 is, for example, a floor heater. The outlet of the heat absorption pipe of the heating secondary heat exchanger 220 is connected to an intermediate pipe 35. A heating tank 69 (an example of a mounting member) and a heating circulation pump 36 are provided on the intermediate pipe 35.

[0027] The heating tank 69 is intended to prevent damage to the pipes and other components of the heating circuit B when the liquid (water in this embodiment) circulating through the heating circuit B is heated and expands. As shown in FIG. 5, the heating tank 69 is box-shaped. As shown in FIG. 6, an overflow port 70 (an example of an attachment port) that opens downward is provided in the front portion of the upper part of the heating tank 69. An overflow hose 71 (an example of a flexible hose) is connected to the overflow port 70. The end of the overflow hose 71 opposite the overflow port 70 is connected to an overflow outlet provided in the bottom plate portion 3B1. When the liquid in the heating tank 69 exceeds a predetermined liquid level, the overflow port 70 causes the liquid to overflow (overflow) outside the heating tank 69, thereby preventing damage to the heating tank 69. As shown in FIG. 8, the heating tank 69 is provided with a heating low-temperature thermistor 37.

[0028] The downstream end of the intermediate piping 35 is connected to the inlets of the heating low-temperature forward pipe 38 and the heat transfer pipe of the heating primary heat exchanger 120. The heating low-temperature forward pipe 38 is connected to the low-temperature radiator 34 via an internal thermal valve 39. The outlet of the heat transfer pipe of the heating primary heat exchanger 120 is connected to the heating high-temperature forward pipe 40. The heating high-temperature forward pipe 40 is connected to the high-temperature radiator 33. A heating high-temperature forward pipe 40 is provided with a heating high-temperature thermistor 41. The heating high-temperature forward pipe 40 and the heating return pipe 32 are connected by a bath heating piping 42. A reheating flow control valve 43 is provided in the bath heating piping 42. A heating bypass pipe 44 that bypasses the heating primary heat exchanger 120 and the heating secondary heat exchanger 220 is connected between the upstream side of the heating tank 69 in the intermediate piping 35 and the heating high-temperature forward pipe 40, and a bypass thermal valve 45 that controls the bypass flow rate is provided in the heating bypass pipe 44.

[0029] Therefore, in the heating circuit B, the hot water heated in the heating secondary heat exchanger 220 circulates to the heating return pipe 32 via the intermediate pipe 35, the heating tank 69, the heating low-temperature supply pipe 38, and the low-temperature radiator 34, and also flows into the heating primary heat exchanger 120 via the intermediate pipe 35. The hot water heated in the heating primary heat exchanger 120 returns to the heating return pipe 32 via the heating high-temperature supply pipe 40 and the high-temperature radiator 33, and circulates to the heating secondary heat exchanger 220, the intermediate pipe 35, and the heating tank 69 to the heating primary heat exchanger 120.

[0030] The bath circuit C is provided with a bath heat exchanger 46 into which the bath heating pipe 42 is inserted. The inlet of the bath heat exchanger 46 is connected to a bath return pipe 47 connected to the bath return port of the bottom plate portion 3B1. The bath return port is connected to the bathtub 49 via an external bath return pipe 48. A bath circulation pump 50 is provided downstream of the bath return pipe 47. A bath return thermistor 51 that detects the bath return temperature is provided upstream of the bath circulation pump 50. A water flow switch 52 and a water level sensor 53 are provided downstream of the bath circulation pump 50. The outlet of the bath heat exchanger 46 is connected to a bath supply pipe 54 that is connected to the bath supply port of the bottom plate portion 3B1. The bath supply port is connected to the bathtub 49 via an external bath supply pipe 55. A bath supply thermistor 56 that detects the bath supply temperature is provided in the bath supply pipe 54.

[0031] A drop pipe 57 is connected between the hot water outlet pipe 27 downstream of the bypass pipe 30 and the bath return pipe 47 upstream of the bath circulation pump 50. This drop pipe 57 is equipped with a drop water solenoid valve 58 for opening and closing the drop pipe 57, and a bath water volume sensor 59 for detecting the volume of water flowing through the drop pipe 57, from the upstream side (hot water outlet pipe 27 side). The drop pipe 57 allows hot water heated by the hot water supply circuit A to be supplied to the bathtub 49. Three check valves 60, 60, 60 are installed downstream of the bath water volume sensor 59. A cut-off valve 61 is connected between these check valves 60. This cut-off valve 61 is connected to a drain pipe 62 connected to an overflow outlet provided in the bottom plate portion 3B1 and an inlet pipe 63 connected to the water supply pipe 22 downstream of the strainer 23. When the internal pressure of the hot water in the drop pipe 57 increases due to the back pressure from the bath return pipe 47 and becomes greater than the back pressure from the inlet pipe 63, the cut-off valve 61 discharges the hot water that has flowed back from the drop pipe 57 to the overflow outlet via the drain pipe 62.

[0032] In this way, a bath circuit C that circulates hot and cold water in the bathtub 49 is formed by the bath heat exchanger 46, the bath supply pipe 54, the bath return pipe 47, etc.

[0033] As shown in Figures 1 to 3, a neutralizer 64 for neutralizing drain generated in the secondary heat exchange device 200 is provided within the housing 3. As shown in Figure 3, the inlet of the neutralizer 64 is connected via a drain hose 65 to a drain discharge port 232 provided in a casing 230 of the secondary heat exchange device 200. Furthermore, as shown in Figure 8, the outlet of the neutralizer 64 is connected via a drain discharge pipe 67 to the drain pipe 62 of the isolation valve 61. The neutralizer 64 is provided with a water level electrode 68 for detecting the water level.

[0034] Controller 80 (not shown in FIG. 8) receives detection signals from thermistors, sensors, etc. and operates valves, etc. to control the outlet hot water temperature, fill bathtub 49 with hot water, and control the heating temperature. Although not shown, hot water heater 1 is equipped with a remote control, etc. that is connected to controller 80 so that it can communicate with it.

[0035] [Drain hose] The configuration of the drain hose 65 of this embodiment will be described in detail below. As shown in Fig. 3, the upper end of the drain hose 65 is fixed to the cylindrical drain outlet 232 by a hose band 66, with the cylindrical drain outlet 232 inserted inside. The drain hose 65 is made of, for example, a resin material. The drain hose 65 maintains a predetermined shape in its natural state when no external force is applied, and is configured to be able to flex and deform to a certain extent when an external force is applied.

[0036] As shown in FIGS. 2 and 6, the drain hose 65 has a shape that is bent at multiple locations. Specifically, the drain hose 65 includes a first extending portion 65A, a first bent portion 65B, a gently sloping portion 65C, a second bent portion 65D, and a second extending portion 65E. The first extending portion 65A is a conduit that extends vertically, and the upper portion of the first extending portion 65A is connected to the drain outlet 232. The first bent portion 65B is a conduit that continues to the lower end of the first extending portion 65A and bends to the right from the first extending portion 65A. The gently sloping portion 65C is a conduit that continues to the first bent portion 65B and extends to the right from the first bent portion 65B. The gently sloping portion 65C is disposed so as to have a gentle slope relative to the horizontal direction. Specifically, the gentle slope portion 65C slopes gently downward from its left end located on the drain outlet 232 side (i.e., the upstream side) to its right end located on the neutralizer 64 side (i.e., the downstream side). The second bent portion 65D is a pipe continuing from the gentle slope portion 65C and is a pipe bent downward from the gentle slope portion 65C. The second extending portion 65E is a pipe continuing from the second bent portion 65D and is a pipe extending downward from the second bent portion 65D. The lower end of the second extending portion 65E is connected to the neutralizer 64.

[0037] [Identification mark] The drain hose 65 has a visible identification mark M1 on its upper end (first extension portion 65A). When the drain hose 65 is attached to the drain outlet 232 at a suitable angle, the identification mark M1 faces forward. The identification mark M1 may be, for example, a sticker or paint. Alternatively, the identification mark M1 may be formed by providing an uneven shape on the outer peripheral surface of the first extension portion 65A.

[0038] Drain hose 65 has a curved shape to avoid other components within hot water heater 1, and the installation angle of drain hose 65 when attaching drain hose 65 to drain outlet 232 (more specifically, the rotation angle relative to drain outlet 232, which extends in the vertical direction) is important. If the installation angle of drain hose 65 is inappropriate, drain hose 65 may interfere with other components (e.g., hot water outlet pipe 27 or primary heat exchanger 100), making it difficult to properly position. For example, gently sloping portion 65C of drain hose 65, which should be positioned in a downwardly sloping position, may interfere with other components and end up in a slightly upwardly sloping position. Furthermore, if the component with which drain hose 65 interferes becomes hot, drain hose 65 may be thermally damaged.

[0039] However, in this embodiment, by providing drain hose 65 with identification mark M1, drain hose 65 can be appropriately positioned in hot water heater 1. In detail, an operator can avoid interference between drain hose 65 and other components by attaching drain hose 65 to drain outlet 232 at an attachment angle such that identification mark M1 is at the front.

[0040] [Overflow hose] The configuration of overflow hose 71 of this embodiment will be described in detail below. As shown in Fig. 4, the upper end of overflow hose 71 is fixed to overflow port 70, which is cylindrical, with overflow port 70 inserted into the upper end. Overflow hose 71 is made of, for example, a resin material. Overflow hose 71 maintains a predetermined shape in its natural state when no external force is applied, and is configured to be able to flex and deform to a certain extent when an external force is applied.

[0041] As shown in FIGS. 4 and 5, overflow hose 71 has a shape that is bent at multiple locations. Specifically, overflow hose 71 includes a first extending portion 71A, a first bent portion 71B, a second extending portion 71C, a second bent portion 71D, a third extending portion 71E, a third bent portion 71F, and a fourth extending portion 71G. First extending portion 71A is a conduit that extends substantially vertically, and an upper portion of first extending portion 71A is connected to overflow port 70. First bent portion 71B is a conduit that continues to the lower end of first extending portion 71A and is bent rearward from first extending portion 71A. Second extending portion 71C is a conduit that continues to first bent portion 71B and extends rearward while sloping downward from first bent portion 71B. The second bent portion 71D is a pipe continuing from the second extending portion 71C and is a pipe bent so as to bend downward from the second extending portion 71C. The third extending portion 71E is a pipe continuing from the second bent portion 71D and is a pipe extending substantially downward from the second bent portion 71D. The third bent portion 71F is a pipe continuing from the third extending portion 71E and is a pipe bent so as to bend toward the right from the third extending portion 71E. The fourth extending portion 71G is a pipe continuing from the third bent portion 71F and is a pipe extending to the right while sloping downward from the third bent portion 71F. The end of the fourth extending portion 71G opposite the third bent portion 71F is connected to an overflow outlet provided in the bottom plate portion 3B1.

[0042] [Identification mark] As shown in FIGS. 2 and 6, overflow hose 71 has a visible identification mark M2 on its upper end (the upper end of first extension 71A). When overflow hose 71 is attached to overflow port 70 at a suitable angle, identification mark M2 faces forward. Identification mark M2 may be, for example, a sticker or paint. Identification mark M2 may also be formed by providing an uneven shape on the outer circumferential surface of first extension 71A.

[0043] Overflow hose 71 has a curved shape that avoids other components inside hot water heater 1, and the installation angle of overflow hose 71 when attaching it to overflow port 70 (more specifically, the angle of rotation relative to overflow port 70, which extends in the vertical direction) is important. If the installation angle of overflow hose 71 is inappropriate, overflow hose 71 may interfere with other components (for example, heating return pipe 32 (see Figures 4 and 5)), making it difficult to position it properly. Furthermore, if the component that overflow hose 71 interferes with becomes too hot, overflow hose 71 may be thermally damaged.

[0044] However, in this embodiment, by providing identification mark M2 on overflow hose 71, overflow hose 71 can be appropriately positioned in hot water heater 1. In detail, an operator can avoid interference between overflow hose 71 and other components by attaching overflow hose 71 to overflow port 70 at an attachment angle such that identification mark M2 is at the front.

[0045] [Positioning member] In this embodiment, as shown in Fig. 6, a positioning member 90 is provided to position the drain hose 65 in an appropriate posture. The positioning member 90 is configured to position the drain hose 65 so that the gently sloping portion 65C of the drain hose 65 can maintain a downwardly sloping posture in particular.

[0046] As shown in FIG. 7, the positioning member 90 is plate-shaped. The positioning member 90 is made of, for example, a metal plate. The positioning member 90 includes a main body portion 91, a slope portion 92, a pressing portion 93, and a fixing portion 94. The main body portion 91 is plate-shaped and long in the left-right direction and thin in the front-to-back direction. Two first insertion holes 91A are provided near the center of the main body portion 91 in the left-to-right direction, spaced apart from each other in the left-to-right direction. The first insertion holes 91A penetrate the main body portion 91 in the front-to-back direction.

[0047] The slope portion 92 has a shape that is long in the left-right direction and extends forward from the lower part of the main body portion 91. The slope portion 92 is shaped like a thin plate that is approximately vertically. The slope portion 92 is formed in approximately two-thirds of the right side of the main body portion 91. The slope portion 92 slopes gently downward as it extends to the right. The slope portion 92 is formed, for example, by bending the metal plate that constitutes the positioning member 90 forward.

[0048] The pressing portion 93 is provided at a position near the right end of the main body portion 91. The pressing portion 93 includes an upper pressing portion 93A extending forward from the main body portion 91 and a front pressing portion 93B extending downward from the front end of the upper pressing portion 93A. The upper pressing portion 93A is a plate-like member that is thin in the vertical direction, and the front pressing portion 93B is a plate-like member that is thin in the front-rear direction. The upper pressing portion 93A faces the slope portion 92 in the vertical direction. The pressing portion 93 is formed, for example, by cutting and bending the metal plate that constitutes the positioning member 90.

[0049] The fixed portion 94 extends leftward from the main body 91. The fixed portion 94 is shaped like a thin plate in the front-to-rear direction. A second insertion hole 94A is formed at the left end of the fixed portion 94. The second insertion hole 94A penetrates the fixed portion 94 in the front-to-rear direction.

[0050] In this embodiment, as shown in FIG. 6 , the positioning member 90 is fixed to the primary heat exchange device 100. Specifically, the positioning member 90 is fixed to a part of an exhaust hood 400 that is fixed to the can body 130 of the primary heat exchange device 100 so as to close the upper opening of the can body 130. The positioning member 90 is fixed to the exhaust hood 400 (and the primary heat exchange device 100) by fastening screws inserted into the first insertion holes 91A to fastening portions provided on the exhaust hood 400. The positioning member 90 is disposed on the front side of the upper part of the primary heat exchange device 100 and above the heat transfer tubes that penetrate the front surface of the can body 130. As shown in FIG. 3 , the main body 91 is disposed spaced apart from the front surface of the can body 130 in the front-rear direction. This provides a gap between the drain hose 65 positioned by the positioning member 90 and the front surface of the can body 130. With this arrangement, it is possible to prevent drain hose 65 from being thermally damaged by the heat that primary heat exchange device 100 carries while hot water heater 1 is in operation.

[0051] As shown in FIG. 6 , the positioning member 90 abuts against the gentle slope portion 65C of the drain hose 65, thereby ensuring that the gentle slope portion 65C is in a downwardly inclined position. Specifically, substantially the entire lower portion of the gentle slope portion 65C is disposed along the upper surface of the slope portion 92, and the portion of the gentle slope portion 65C near the right end (i.e., downstream side) is clamped between the upper retaining portion 93A and the slope portion 92. The front retaining portion 93B restricts the gentle slope portion 65C from moving forward. Therefore, the gentle slope portion 65C is prevented from being in an upwardly inclined position. As a result, the drain can be successfully sent to the neutralizer 64 via the drain hose 65.

[0052] Furthermore, fixing portion 94 of positioning member 90 fixes heating tank 69. Note that in FIG. 6 , heating high-temperature supply pipe 40 is omitted to make fixing portion 94 easier to see. The screw inserted into second insertion hole 94A is fastened to a fastening portion provided on heating tank 69, thereby fixing heating tank 69 to positioning member 90. With this configuration, there is no need to provide any other configuration for fixing heating tank 69, and therefore the configuration of hot water heater 1 can be simplified.

[0053] [Effects of the embodiment] As described above, the water heater / heating apparatus 1 (an example of a water heater) of the embodiment comprises a secondary heat exchanger 200 (an example of an attachment member) that recovers latent heat from the combustion exhaust, the secondary heat exchanger 200 having a drain outlet 232 (an example of an attachment port) provided therein, and a drain hose 65 (an example of a flexible hose) having an end attached to the drain outlet 232, the drain hose 65 having a visible identification mark M1 at its end, and when the drain hose 65 is attached at a suitable attachment angle to the drain outlet 232, the identification mark M1 is arranged facing forward.

[0054] With this configuration, a worker attaching drain hose 65 to drain outlet 232 can use identification mark M1 as a guide to attach drain hose 65 to drain outlet 232 at a suitable attachment angle. Therefore, the posture of drain hose 65 can be stabilized, and drain hose 65 can be placed in an appropriate position within hot water heater 1.

[0055] Furthermore, the hot water heater 1 of the embodiment comprises a heating tank 69 (an example of an attachment member) provided in a heating circuit B (an example of a circulation circuit) through which liquid circulates, the heating tank 69 having an overflow port 70 (an example of an attachment port) provided therein, and an overflow hose 71 (an example of a flexible hose) having an end attached to the overflow port 70, the overflow hose 71 having a visible identification mark M2 at its end, and when the overflow hose 71 is attached at a suitable attachment angle to the overflow port 70, the identification mark M2 is arranged facing forward.

[0056] With this configuration, a worker attaching overflow hose 71 to overflow port 70 can use identification mark M2 as a guide to attach overflow hose 71 to overflow port 70 at a suitable angle. This allows the posture of overflow hose 71 to be stabilized, and overflow hose 71 to be positioned in an appropriate position within hot water heater 1.

[0057] <Other embodiments> (1) In the above embodiment, the drain hose 65 and the overflow hose 71 are exemplified as flexible hoses. However, the flexible hose of the present disclosure may be either a drain hose or an overflow hose, or a hose other than a drain hose or an overflow hose. Similarly, a member different from that of the above embodiment may be used as the attachment member of the present disclosure. Furthermore, the shape and arrangement of the flexible hose may be modified as appropriate within the scope that allows the object of the present disclosure to be achieved.

[0058] (2) In the above embodiment, the positioning member 90 is provided, but the positioning member does not have to be provided.

[0059] (3) In the above embodiment, the hot water heater 1 includes a hot water circuit A, a heating circuit B, and a bath circuit C. However, the hot water heater of the present disclosure does not necessarily have to include a heating circuit and a bath circuit. [Explanation of symbols]

[0060] 1: Hot water heater / heater (water heater) 2: inner body, 3: housing, 3A: opening, 3B: housing body, 3B1: bottom plate, 3B2: left side plate, 3B3: right side plate, 3B4: top plate, 3B5: rear wall, 8: ignition plug, 9: flame rod, 10: combustion fan, 17: gas pipe, 18: gas branch pipe, 19: gas solenoid valve, 20: main gas solenoid valve, 21: gas proportional valve, 22: water supply pipe, 23: straight Na, 24: Hot water supply water volume sensor, 25: Hot water supply inlet thermistor, 26: Water volume control valve, 27: Hot water outlet pipe, 28: Hot water heat exchanger thermistor, 29: Hot water outlet thermistor, 30: Bypass pipe, 31: Water distribution valve, 32: Heating return pipe, 33: High-temperature radiator, 34: Low-temperature radiator, 35: Intermediate pipe, 36: Heating circulation pump, 37: Heating low-temperature thermistor, 38: Heating Low temperature supply pipe, 39: Built-in thermal valve, 40: Heating high temperature supply pipe, 41: Heating high temperature thermistor, 42: Bath heating pipe, 43: Reheating flow control valve, 44: Heating bypass pipe, 45: Bypass thermal valve, 46: Bath heat exchanger, 47: Bath return pipe, 48: External bath return pipe, 49: Bathtub, 50: Bath circulation pump, 51: Bath return thermistor, 52: Water flow switch, 53: Water level sensor, 54: Bath supply pipe, 55: External bath supply pipe, 56: Bath supply thermistor, 57: Drop pipe, 58: Drop water solenoid valve, 59: Bath water level sensor, 60: Check valve, 61: Cut-off valve, 62: Drain pipe, 63: Inlet pipe, 64: Neutralizer, 66: Hose band, 67: Drain discharge pipe, 68: Water level electrode, 80: Controller 65: Drain hose (flexible hose), 65A: First extension portion, 65B: First bent portion, 65C: Gentle slope portion, 65D: Second bent portion, 65E: Second extension portion, M1: Identification mark 69: Heating tank (mounting part), 70: Overflow port (mounting port) 71: overflow hose (flexible hose), 71A: first extension, 71B: first bent portion, 71C: second extension, 71D: second bent portion, 71E: third extension, 71F: third bent portion, 71G: fourth extension, M2: identification mark 90: Positioning member, 91: Main body, 91A: First insertion hole, 92: Slope portion, 93: Pressing portion, 93A: Upper pressing portion, 93B: Front pressing portion, 94: Fixing portion, 94A: Second insertion hole 100: Primary heat exchanger, 110: Hot water primary heat exchanger, 120: Heating primary heat exchanger, 130: Boiler body 200: Secondary heat exchanger (mounting member), 210: Hot water secondary heat exchanger, 220: Heating secondary heat exchanger, 230: Casing, 231: Exhaust pipe, 232: Drain outlet (mounting port) 300: burner device, 310: hot water burner group, 320: heating burner group, 330: burner case 400: Exhaust hood A: Hot water circuit, B: Heating circuit, C: Bath circuit

Claims

[Claim 1] A hot water heater including a housing, an inner body housed in the housing, and a heating tank, The housing includes a front cover located on the front side, a bottom plate portion located on the lower side in a front view, a pair of side plate portions located on both the left and right sides in a front view, a top plate portion located on the upper side in a front view, and a rear wall located on the rear side, The inner shell includes a burner device, a primary heat exchanger, and a secondary heat exchanger, the secondary heat exchanger is disposed above the primary heat exchanger, the burner device is connected to a lower part of the primary heat exchanger, and the heating tank is disposed between the inner shell and one of the side plate portions; the secondary heat exchanger has an inlet of a heat absorption tube and an outlet of the heat absorption tube; a heating return pipe connected to the heating return port of the bottom plate portion is connected to an inlet of the heat absorption pipe, and an intermediate pipe connected to the heating tank is connected to an outlet of the heat absorption pipe, The heating return pipe includes a return pipe side rear extension portion extending rearward from the inlet of the heat absorption pipe, and a return pipe side downward extension portion extending downward from the return pipe side rear extension portion, the intermediate pipe includes an intermediate pipe-side rearward extending portion extending rearward from an outlet of the heat absorption pipe, and an intermediate pipe-side downward extending portion extending downward from the intermediate pipe-side rearward extending portion, the return pipe side rear extension portion and the intermediate pipe side rear extension portion are disposed above the heating tank, The hot water heater, wherein the return pipe side downward extension portion and the intermediate pipe side downward extension portion are arranged along the rear wall of the housing and overlap each other in a side view.

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