Storage water heater

Abstract

To provide a storage type water heater that allows a worker to easily carry out a process of assembling piping communicating with a hot water storage tank.SOLUTION: The storage type water heater comprises a hot water storage tank, an upper insulation material 21 covering the upper part of the hot water storage tank, a lid insulation material 25 attached to the upper face of the upper insulation material 21, and an upper pipe 50 passing through a gap formed between the upper insulation material 21 and the lid insulation material 25, with one end of the pipe connected to a port 52 disposed on the upper part of the hot water storage tank. The lid insulation material 25 comprises a holder that contacts an object, i.e., either or both of the upper pipe 50 and a first instrument attached to the upper pipe 50 to block the object from moving.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] The hot water storage type water heater disclosed in the following Patent Document 1 is constructed by integrating wall-like protrusions on both sides of the pressure relief valve connected to a pressure relief valve pipe connected to the top of the hot water storage tank with the insulating material surrounding the hot water storage tank, thereby positioning and fixing the pressure relief valve without installing any new parts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-230190 Summary of the Invention [Problem to be solved by the invention]

[0004] In the manufacturing process of a storage-type hot water heater, a process of assembling a pipe connected to the hot water tank is carried out after a process of assembling a heat insulating material that covers the hot water tank. The storage-type hot water heater disclosed in Patent Document 1 has the following problem. When the heat insulating material with a wall-like protrusion is attached, the pressure relief valve is fixed in position, eliminating flexibility in its position. When the process of connecting the pressure relief valve pipe to the hot water tank or the process of connecting the expansion water discharge pipe to the pressure relief valve is carried out in this state, the lack of flexibility in the position of the pressure relief valve makes it difficult to connect the pipe. Therefore, workers may forcefully insert and connect the pipe. Forcing the pipe to be inserted and connected can easily damage the sealing material at the pipe connection or generate residual stress in the sealing material. As a result, the sealing performance of the sealing material deteriorates over time, potentially resulting in water leakage.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a storage-type water heater that can easily perform the process of assembling piping that connects to the hot water storage tank. [Means for solving the problem]

[0006] The hot water storage type water heater according to the present disclosure comprises a hot water storage tank, an upper insulation covering the top of the hot water storage tank, a lid insulation attached to the upper surface of the upper insulation, and an upper pipe having one end connected to a port provided on the top of the hot water storage tank and passing through a gap formed between the upper insulation and the lid insulation, the lid insulation having a retaining portion that prevents movement of an object, which is either or both of the upper pipe and a first device attached to the upper pipe, a groove is formed on the upper surface of the upper insulation, the upper pipe is arranged to pass through the groove, the width of the groove is larger than the outer diameter of the upper pipe, when the lid insulation is not attached to the upper insulation, the upper pipe can move within the groove, and when the lid insulation is removed from the upper insulation, the range of movement of the object is wider than when the lid insulation is attached to the upper insulation. The lid insulation material has a groove as a holding portion into which the object is fitted, and the object is held in a state of being pressed into the groove. It is something. In addition, the hot water storage type water heater according to the present disclosure comprises a hot water storage tank, an upper insulation covering the top of the hot water storage tank, a lid insulation attached to the upper surface of the upper insulation, and an upper pipe having one end connected to a port provided on the top of the hot water storage tank and passing through a gap formed between the upper insulation and the lid insulation, the lid insulation having a retaining portion that prevents movement of an object, which is either or both of the upper pipe and a first device attached to the upper pipe, a groove formed on the upper surface of the upper insulation, the upper pipe being arranged to pass through the groove, and the width of the groove is The groove is larger than the outer diameter of the upper piping, and when the lid insulation is not attached to the upper insulation, the upper piping can move within the groove.When the lid insulation is removed from the upper insulation, the range of movement of the object is expanded compared to when the lid insulation is attached to the upper insulation.The device further includes an outer case that houses the hot water storage tank, the upper insulation, the lid insulation, the upper piping, and the first equipment, and the outer case has removable side panels, and the lid insulation can be removed from the upper insulation by sliding it toward the side panels relative to the upper insulation. In addition, the hot water storage type water heater of the present disclosure comprises a hot water storage tank, an upper insulation covering the top of the hot water storage tank, a lid insulation attached to the upper surface of the upper insulation, and an upper piping having one end connected to a port provided on the top of the hot water storage tank and passing through a gap formed between the upper insulation and the lid insulation, the lid insulation has a retaining portion that prevents movement of an object, which is either or both of the upper piping and a first device attached to the upper piping, a groove is formed on the upper surface of the upper insulation, the upper piping is arranged to pass through the groove, the width of the groove is greater than the outer diameter of the upper piping, when the lid insulation is not attached to the upper insulation, the upper piping can move within the groove, and when the lid insulation is removed from the upper insulation, the range of movement of the object is expanded compared to when the lid insulation is attached to the upper insulation, and the hardness of the lid insulation is lower than that of the upper insulation. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a hot water storage type water heater that can easily perform the process of assembling piping that communicates with the hot water storage tank. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a front view showing a hot water storage type water heater according to a first embodiment. [Figure 2] 1 is a perspective view of the upper part of the hot water storage type water heater according to embodiment 1, with the outer case removed, as seen from diagonally in front. [Figure 3] 1 is a perspective view of the upper part of the hot water storage type water heater according to embodiment 1, with the outer case removed, as seen from diagonally in front. [Figure 4]This is an oblique view of the lid insulation from the underside. [Figure 5] This is an oblique view showing the state in which the lid insulation is being removed from the upper insulation by sliding the lid insulation in a front direction relative to the upper insulation. [Figure 6] FIG. 10 is an exploded oblique view of the upper part of the hot water storage type water heater according to embodiment 2, with the outer case removed, as seen from diagonally in front. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment will be described with reference to the drawings. Common or corresponding elements in each drawing will be assigned the same reference numerals, and the description will be simplified or omitted. In the following description, the term "water" generally means liquid water, and can include water ranging from low-temperature water to high-temperature hot water.

[0010] Embodiment 1 Fig. 1 is a front view showing a storage type water heater 100 according to embodiment 1. Note that in Fig. 1, devices such as piping, pumps, valves, heat exchangers, and control boards provided in storage type water heater 100 are omitted from the illustration.

[0011] As shown in Figure 1, the hot water storage type water heater 100 of this embodiment includes a hot water storage tank 10. The hot water storage tank 10 of this embodiment has a cylindrical outer shape. When the hot water storage type water heater 100 is installed, the central axis of the hot water storage tank 10 is parallel to a vertical line. In the following description, directions will be specified assuming that the central axis of the hot water storage tank 10 is parallel to a vertical line.

[0012] The upper insulation material 21 covers at least a portion of the upper part of the hot water storage tank 10. In the illustrated example, the upper part of the hot water storage tank 10 has a hemispherical or bowl-shaped outer shape with a convex outer surface. The upper insulation material 21 is molded from foamed plastic.

[0013] A plurality of remaining hot water thermistors 32 are attached at positions at different heights on the surface of the body of the hot water storage tank 10. The remaining hot water thermistors 32 correspond to temperature sensors that detect the temperature of the hot water in the hot water storage tank 10.

[0014] The hot water storage type water heater 100 of this embodiment further includes a lower insulation material 22, a vacuum insulation material 23, and a body insulation material 24. The lower insulation material 22 and the body insulation material 24 are molded from foamed plastic. The lower insulation material 22 covers at least a portion of the lower part of the hot water storage tank 10. In the illustrated example, the lower part of the hot water storage tank 10 has a hemispherical or bowl-shaped outer shape with a convex outer surface. The vacuum insulation material 23 covers the periphery of the body of the hot water storage tank 10. The body insulation material 24 covers the body of the hot water storage tank 10 from the outside of the vacuum insulation material 23. The hot water storage type water heater 100 of the present disclosure does not necessarily include the vacuum insulation material 23. Furthermore, the lower insulation material 22 or the body insulation material 24 is not limited to being made of foamed plastic, and may be made of, for example, glass wool.

[0015] The hot water storage tank 10 is housed in a metal outer case 30 while being covered with the above-mentioned insulating material. A bottom plate 31 forms the bottom of the outer case 30. The hot water storage tank 10 is supported on the bottom plate 31 by a plurality of internal legs 40 fixed to the hot water storage tank 10. The hot water storage type water heater 100 is fixed to a foundation or floor surface by a plurality of mounting legs 41 provided below the bottom plate 31.

[0016] The outer shape of the outer case 30 may be a rectangular parallelepiped. The outer case 30 has removable side panels. In this embodiment, the front panel that forms the front of the outer case 30 corresponds to the removable side panel. FIG. 1 shows the outer case 30 with the front panel removed. The front panel of the outer case 30 is removed when performing maintenance on the equipment inside the outer case 30. As shown in the figure, the entire front panel of the outer case 30 may be removable, or only a partial area of the front panel of the outer case 30 may be removable.

[0017] The hot water storage type water heater 100 may include a water heating means for heating the water in the hot water storage tank 10. The configuration of the water heating means is not particularly limited, and may be, for example, a heat pump type or an electric heater disposed in the hot water storage tank 10.

[0018] Figures 2 and 3 are perspective views of the upper part of the storage type water heater 100 according to embodiment 1, with the outer case 30 removed, as seen from the diagonal front. As shown in these figures, the storage type water heater 100 is provided with a lid insulation 25 attached to the upper surface of the upper insulation 21. Figure 2 shows the state before the lid insulation 25 is attached to the upper insulation 21. Figure 3 shows the state after the lid insulation 25 has been attached to the upper insulation 21. The lid insulation 25 is made of foamed plastic. Note that the lid insulation 25 is not shown in Figure 1.

[0019] As shown in Figure 2, the hot water storage type water heater 100 includes an upper pipe 50 that communicates with the hot water storage tank 10, and a relief valve 51 attached to the upper pipe 50. One end of the upper pipe 50 is connected to a port 52 provided at the top of the hot water storage tank 10. As shown in Figure 3, the upper pipe 50 passes through a gap formed between the upper insulation 21 and the lid insulation 25 and protrudes outside the upper insulation 21 and the lid insulation 25. A relief valve 51 is attached to this protruding portion. The lid insulation 25, the upper pipe 50, and the relief valve 51 are housed within the outer case 30.

[0020] When the water in the hot water storage tank 10 is heated and the internal pressure of the hot water storage tank 10 rises above a specified value, the relief valve 51 opens to discharge the fluid, thereby preventing the internal pressure of the hot water storage tank 10 from rising above the specified value. The relief valve 51 corresponds to the first device attached to the upper piping 50.

[0021] Relief valve 51 has a lever 51a. For example, when draining the hot water storage tank 10, lever 51a can be operated to forcibly open relief valve 51 and allow air into hot water storage tank 10. Although not shown in the figures, an installer or user can operate lever 51a through a window formed in the front panel of outer case 30.

[0022] A groove 25a is formed on the underside of the lid insulation 25. As shown in Fig. 3, when the lid insulation 25 is attached to the upper insulation 21, the upper piping 50 fits into the groove 25a, preventing the upper piping 50 from moving. The groove 25a is an example of a retaining portion that contacts the upper piping 50 to prevent the upper piping 50 from moving.

[0023] When the lid insulation 25 is attached to the upper insulation 21, the upper piping 50 is prevented from moving, and therefore the relief valve 51 attached to the upper piping 50 is prevented from moving. Therefore, the relief valve 51 can be reliably positioned in the appropriate position, and the lever 51a can be reliably operated from the window in the front panel of the outer case 30.

[0024] When the lid insulation 25 is removed from the upper insulation 21, the upper piping 50 and the relief valve 51 have a wider range of movement than when the lid insulation 25 is attached to the upper insulation 21. When the lid insulation 25 is removed from the upper insulation 21, the upper piping 50 and the relief valve 51 can move within a certain range, for example, in a direction perpendicular to the longitudinal direction of the upper piping 50. In the manufacturing process of the hot water storage type water heater 100, after the upper insulation 21 is attached to the hot water storage tank 10, work is performed to connect the upper piping 50 to the port 52, or work is performed to connect other piping to the upper piping 50 or the relief valve 51, before attaching the lid insulation 25 to the upper insulation 21. In this case, because the upper piping 50 and the relief valve 51 are movable, workers can easily perform the piping connection work without any strain. This reliably prevents workers from forcibly inserting and connecting piping. This reliably prevents problems such as damage to the seal member at the pipe connection due to excessive work or residual stress caused by excessive load being applied to the seal member, thereby ensuring that the seal member can maintain the tightness of the pipe connection for a long period of time and reliably preventing water leaks.

[0025] As shown in FIG. 2, the hot water storage type water heater 100 further includes an upper pipe 53 that communicates with the hot water storage tank 10. One end of the upper pipe 53 is connected to a port 54 provided at the top of the hot water storage tank 10. As shown in FIG. 3, the upper pipe 53 passes through a gap formed between the upper insulation 21 and the lid insulation 25 and protrudes outside the upper insulation 21 and the lid insulation 25. A groove 25b is formed on the underside of the lid insulation 25. When the lid insulation 25 is attached to the upper insulation 21, the upper pipe 53 fits into the groove 25b, preventing the upper pipe 53 from moving. The groove 25b is an example of a retaining portion that contacts the upper pipe 53 to prevent the upper pipe 53 from moving.

[0026] When the lid insulation 25 is removed from the upper insulation 21, the upper piping 53 has a wider range of movement than when the lid insulation 25 is attached to the upper insulation 21. When the lid insulation 25 is removed from the upper insulation 21, the upper piping 53 can move within a certain range, for example, in a direction perpendicular to the longitudinal direction of the upper piping 53. In the manufacturing process of the hot water storage type water heater 100, after the upper insulation 21 is attached to the hot water storage tank 10, the upper piping 53 is connected to the port 54 or another piping is connected to the upper piping 53 before the lid insulation 25 is attached to the upper insulation 21. Because the upper piping 53 is movable during this process, workers can easily and comfortably perform the piping connection work. This reliably prevents workers from forcibly inserting and connecting piping. This reliably prevents problems such as damage to the sealing member at the piping connection due to forced work or residual stress caused by excessive loads being applied to the sealing member. As a result, the sealing performance of the pipe connection portion provided by the sealing member can be reliably maintained for a long period of time, and the occurrence of water leakage can be reliably prevented.

[0027] As shown in FIG. 2, grooves 21a and 21b are formed on the upper surface of the upper insulation 21. The upper piping 50 is arranged to pass through groove 21a. The upper piping 53 is arranged to pass through groove 21b. The width of groove 21a is larger than the outer diameter of the upper piping 50. The width of groove 21b is larger than the outer diameter of the upper piping 53. When the lid insulation 25 is not attached to the upper insulation 21, the upper piping 50 is movable within groove 21a, and the upper piping 53 is movable within groove 21b. When the lid insulation 25 is attached to the upper insulation 21, grooves 21a and 21b are covered by the lid insulation 25.

[0028] In the following description, the horizontal direction toward the front plate inside the outer case 30 is referred to as the "front direction." Each of the upper pipes 50 and 53 has a portion that extends along the front direction. The portions of the upper pipes 50 and 53 that extend along the front direction fit into the grooves 25a and 25b.

[0029] FIG. 4 is a perspective view of the lid insulation 25 as viewed from the underside. In the following description, the dimension of the groove 25a in the horizontal direction perpendicular to the longitudinal direction of the groove 25a is referred to as the "width" of the groove 25a. Furthermore, the direction inside the groove 25a from the shallow portion near the underside of the lid insulation 25 to the deep portion of the groove 25a is referred to as the "groove depth direction." The groove depth direction faces vertically upward when the lid insulation 25 is attached to the upper insulation 21. The width of the groove 25a continuously decreases in the groove depth direction. That is, the width of the groove 25a gradually narrows toward the depth of the groove 25a. This provides the following advantages. Because the width of the groove 25a is wide in the shallow portion of the groove 25a, the upper piping 50 can be more reliably and easily inserted into the groove 25a when attaching the lid insulation 25 to the upper insulation 21. This more reliably prevents the upper piping 50 from being pinched between the underside of the lid insulation 25 and the upper side of the upper insulation 21, causing the lid insulation 25 to lift up. Furthermore, since the width of the groove 25a gradually narrows toward the depth of the groove 25a, the upper piping 50 fits more reliably into the groove 25a and is positioned therein. Therefore, the upper piping 50 can be more reliably held in the appropriate position. The same applies to the width of the groove 25b. For example, by providing a rounded R-shape or a chamfered shape for the portion indicated by the dashed line in FIG. 3, the widths of the grooves 25a and 25b can be formed to continuously decrease in the groove depth direction.

[0030] The upper pipe 50 may be held in a state where it is press-fitted into the groove 25a. Also, the upper pipe 53 may be held in a state where it is press-fitted into the groove 25b. By doing so, the following effects can be obtained. The upper pipes 50, 53 can be held more securely in the appropriate positions. No gaps are generated between the upper pipes 50, 53 and the grooves 25a, 25b, improving the insulation performance. The lid insulation material 25 is fixed by the frictional force between the upper pipes 50, 53 and the grooves 25a, 25b, so adhesive tape or the like for fixing the lid insulation material 25 can be omitted or simplified, improving assembly.

[0031] The hardness of the lid insulation 25 may be configured to be lower than the hardness of the upper insulation 21. This "hardness" can be compared, for example, by the value of Young's modulus or compressive modulus of elasticity. The higher the value of Young's modulus or compressive modulus of elasticity, the higher the hardness. If the hardness of the lid insulation 25 is lower than that of the upper insulation 21, the lid insulation 25 is more likely to elastically deform when attaching the lid insulation 25 to the upper insulation 21, making the work easier. Furthermore, by having the lid insulation 25, which is more likely to elastically deform, adhere closely to the upper piping 50, 53, the upper piping 50, 53 can be more reliably held in the appropriate position.

[0032] The lid insulation 25 may be held in a pressed-fit state in a recess formed in the upper insulation 21. This makes it possible to omit or simplify adhesive tape or the like for fixing the lid insulation 25, improving assembly ease.

[0033] The lid insulating material 25 may be made of expanded polystyrene. Expanded polystyrene is easy to mold even into complex structures, making it easy to create retaining structure such as the grooves 25a and 25b.

[0034] The top insulation 21 may be made of foamed polyurethane. Foamed polyurethane has lower thermal conductivity and better insulating properties than foamed polystyrene or glass wool. The foamed polyurethane may be what is generally called rigid urethane foam. It is more difficult to form complex shapes from foamed polyurethane than from foamed polystyrene. However, since the shape of the top insulation 21 is not as complex as that of the lid insulation 25, it can also be molded from foamed polyurethane.

[0035] As shown in Figure 4, grooves 25a, 25b continue straight from front end 25c to rear end 25d of lid insulation 25. Therefore, upper piping 50, 53 can move relatively longitudinally within grooves 25a, 25b. Therefore, lid insulation 25 can be removed from upper insulation 21 by sliding lid insulation 25 in a predetermined direction relative to upper insulation 21.

[0036] 5 is a perspective view showing the state in which the lid insulation 25 is in the process of being removed from the upper insulation 21 by sliding the lid insulation 25 in a front direction relative to the upper insulation 21. When the front panel of the outer case 30 is removed during maintenance, the lid insulation 25 becomes slidable in a front direction relative to the upper insulation 21, so that the lid insulation 25 can be removed. In this embodiment, the lid insulation 25 can be removed without removing the top panel of the outer case 30.

[0037] As shown in Figure 2, the upper insulation 21 has an opening for exposing the port 52 and an opening for exposing the port 54. Before attaching the lid insulation 25, these exposed portions may be covered with another insulation material (not shown). This improves the insulation performance. Furthermore, since there is no need to form a protrusion on the lid insulation 25 to cover the openings, a structure in which the lid insulation 25 can slide forward relative to the upper insulation 21 can be easily achieved.

[0038] In the present embodiment, grooves 25a and 25b have been described as an example of a retaining portion that prevents movement of upper pipes 50 and 53, but the configuration of the retaining portion in this disclosure is not limited to grooves 25a and 25b. For example, a configuration may be made in which a protrusion is provided on lid insulation 25 as a retaining portion, and the protrusion comes into contact with upper pipes 50 and 53 to prevent movement of upper pipes 50 and 53. Furthermore, the retaining portion may be formed by a separate part that is integrated by insert molding when lid insulation 25 is molded from foam plastic.

[0039] In the present embodiment, the groove 25a serving as the retaining portion contacts the upper piping 50 between the relief valve 51 and the port 52. This is more advantageous in preventing movement of the relief valve 50. Note that in the present embodiment, an example has been described in which the retaining portion contacting the upper piping 50 prevents movement of the upper piping 50, thereby preventing movement of the relief valve 51. This example is not limiting, and in the present disclosure, a retaining portion that contacts the relief valve 51 itself to prevent movement of the relief valve 51 may be formed in the lid insulating material 25. Furthermore, a retaining portion that contacts both the upper piping 50 and the relief valve 51 may be formed in the lid insulating material 25.

[0040] Embodiment 2 Next, a second embodiment will be described with reference to Fig. 6, focusing on the differences from the first embodiment described above, and elements that are common to or correspond to the elements described above will be given the same reference numerals, and explanations of the common elements will be simplified or omitted. Fig. 6 is an exploded perspective view of the upper part of a hot water storage type water heater 101 according to the second embodiment, with the outer case 30 removed, as seen from the diagonal front.

[0041] As shown in Figure 6, storage type hot water heater 101 of the present embodiment includes lid insulation 25A and lid insulation 25B instead of lid insulation 25 in embodiment 1. Lid insulation 25A and lid insulation 25B correspond to lid insulation 25 divided into two halves at cut surface 25e between groove 25a and groove 25b. Lid insulation 25A includes groove 25a as a retaining portion. Lid insulation 25B includes groove 25b as a retaining portion. In this embodiment, the work of attaching lid insulation 25A so that upper piping 50 fits into groove 25a can be separated from the work of attaching lid insulation 25B so that upper piping 53 fits into groove 25b, making the work even easier and more reliable. [Explanation of symbols]

[0042] 10 hot water storage tank, 21 upper insulation material, 21a groove, 21b groove, 22 lower insulation material, 23 vacuum insulation material, 24 body insulation material, 25 lid insulation material, 25A lid insulation material, 25B lid insulation material, 25a groove, 25b groove, 25c front end, 25d rear end, 25e cut surface, 30 outer case, 31 bottom panel, 32 remaining hot water thermistor, 40 internal leg, 41 mounting leg, 50 upper piping, 51 relief valve, 51a lever, 52 port, 53 upper piping, 54 port, 100 hot water storage type water heater, 101 hot water storage type water heater

Claims

1. A hot water tank and an upper heat insulating material covering an upper portion of the hot water storage tank; a lid insulation material attached to the upper surface of the upper insulation material; an upper pipe having one end connected to a port provided at the upper part of the hot water storage tank and passing through a gap formed between the upper insulation material and the lid insulation material; Equipped with the lid insulation has a holding portion that contacts one or both of the upper piping and a first device attached to the upper piping to prevent the object from moving, a groove is formed on an upper surface of the upper heat insulating material, the upper piping is arranged to pass through the groove, and a width of the groove is larger than an outer diameter of the upper piping; When the lid insulation is not attached to the upper insulation, the upper piping is movable within the groove, When the lid insulation is removed from the upper insulation, the range of movement of the object is increased compared to when the lid insulation is attached to the upper insulation, The lid insulating material has a groove as the holding portion into which the object fits, The object is a storage tank type water heater that is held in a pressed-fit state in the groove.

2. A hot water tank and an upper heat insulating material covering an upper portion of the hot water storage tank; a lid insulation material attached to the upper surface of the upper insulation material; an upper pipe having one end connected to a port provided at the upper part of the hot water storage tank and passing through a gap formed between the upper insulation material and the lid insulation material; Equipped with the lid insulation has a holding portion that contacts one or both of the upper piping and a first device attached to the upper piping to prevent the object from moving, a groove is formed on an upper surface of the upper heat insulating material, the upper piping is arranged to pass through the groove, and a width of the groove is larger than an outer diameter of the upper piping; When the lid insulation is not attached to the upper insulation, the upper piping is movable within the groove, When the lid insulation is removed from the upper insulation, the range of movement of the object is increased compared to when the lid insulation is attached to the upper insulation, an outer case that houses the hot water storage tank, the upper insulation material, the lid insulation material, the upper piping, and the first device; The outer case has a removable side panel, A hot water storage type water heater in which the lid insulation can be removed from the upper insulation by sliding the lid insulation toward the side panel relative to the upper insulation.

3. A hot water tank and an upper heat insulating material covering an upper portion of the hot water storage tank; a lid insulation material attached to the upper surface of the upper insulation material; an upper pipe having one end connected to a port provided at the upper part of the hot water storage tank and passing through a gap formed between the upper insulation material and the lid insulation material; Equipped with the lid insulation has a holding portion that contacts one or both of the upper piping and a first device attached to the upper piping to prevent the object from moving, a groove is formed on an upper surface of the upper heat insulating material, the upper piping is arranged to pass through the groove, and a width of the groove is larger than an outer diameter of the upper piping; When the lid insulation is not attached to the upper insulation, the upper piping is movable within the groove, When the lid insulation is removed from the upper insulation, the range of movement of the object is increased compared to when the lid insulation is attached to the upper insulation, A storage type hot water heater in which the hardness of the lid insulation is lower than the hardness of the top insulation.

4. The hot water storage type water heater according to claim 2 or 3, wherein the lid insulation material has a groove as the holding portion into which the object fits.

5. 5. The hot water storage type water heater according to claim 1, wherein the width of the groove continuously decreases in the direction of the depth of the groove.

6. The hot water storage type water heater according to claim 4, wherein the object is held in a state of being pressed into the groove.

7. 7. A hot water storage type water heater according to claim 1, wherein the lid insulation is removable from the upper insulation by sliding the lid insulation in a predetermined direction relative to the upper insulation.

8. The hot water storage type water heater according to any one of claims 1 to 7, comprising a plurality of the lid insulation members, each of the lid insulation members having the holding portion.

9. The hot water storage type water heater according to any one of claims 1 to 8, wherein the cover insulation is held in a state of being pressed into a recess formed in the upper insulation.

10. The hot water storage type water heater according to any one of claims 1 to 9, wherein the lid insulation material is made of expanded polystyrene.

11. The hot water storage type water heater according to any one of claims 1 to 10, wherein the holding portion contacts the upper piping between the first device and the port.

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