JP2017145968A - Hot water storage type hot-water supply machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To resolve a problem that an upper part of a hot water storage tank 4 contains hot water of higher temperature than that of a lower part thereof when one unit of the hot water storage tank 4 is installed and the portion becoming a higher temperature side showing easy heat radiation is required to have a higher heat insulation performance.SOLUTION: A right side heat insulation material 15 has a right side heat insulation upper part 15a covering an upper part of the hot water storage tank 4 and a right side heat insulation lower part 15b covering a lower part of the hot water storage tank 4. A left side heat insulation material 16 has a left side heat insulation upper part 16a covering an upper part of the hot water storage tank 4 and a left side heat insulation lower part 16b covering a lower part of the hot water storage tank 4. The right side heat insulation material 15 shows a different expansion ratio between the right side heat insulation upper part 15a near a tap pipe 6 and the right side heat insulation lower part 15b near a water supply pipe 5. The left side heat insulation material 16 shows a different expansion ratio between the left side heat insulation upper part 16a near the tap pipe 6 and the left side heat insulation lower part 16b near the water supply pipe 5 and at the same time the heat insulation materials showing different expansion ratios are integrally molded in such a way that at least the upper part near the tap pipe 6 may show a lower expansion ratio than that of the lower part near the water supply pipe 5.SELECTED DRAWING: Figure 3

Description

  The present invention is an invention relating to a hot water storage type water heater.

  Conventionally, a hot water storage tank provided in this type of hot water storage type hot water heater has been covered with a foam-molded heat insulating material excellent in heat insulating properties to prevent heat dissipation in the hot water storage tank.

  In addition, in a hot water type hot water heater equipped with two hot water storage tanks, the surroundings are covered with foam-molded heat insulating material so that the two hot water storage tanks are not in contact with each other to prevent heat exchange between the hot water storage tanks and to dissipate hot water in the hot water storage tanks. (Patent Document 1).

JP 2006-349321 A

  However, in the case of a single hot water storage tank, the hot water is higher in the upper part than in the lower part of the hot water storage tank, and in the case of two hot water storage tanks, the hot water storage in which the hot water discharge pipe is connected rather than the hot water storage tank to which the water supply pipe is connected. Since hot water stored in the tank is hotter, there is a problem that higher heat insulation performance is required for the portion on the high temperature side where heat is easily released.

  In the case of two hot water storage tanks, there is a hot water storage tank on the side where hot hot water is stored and a hot water storage tank on which hot water of relatively low temperature is stored. If the thickness of the tank is increased, the outer dimensions of the hot water storage tank on the side where hot water is stored higher than the hot water storage tank on the relatively low temperature side will increase, and the installation area of the tank unit will increase. .

  In order to solve the above-mentioned problems, the present invention provides at least one hot water storage tank for storing hot water heated by a heating means, and the hot water storage tank as a foamed plastic-based heat insulating material for preventing heat dissipation in the hot water storage tank. A right side heat insulating material covering the right half, a left side heat insulating material covering the left half, an upper surface heat insulating material covering the upper part, a lower surface heat insulating material covering the lower part, and the lower part of the hot water storage tank for supplying water into the hot water storage tank A hot-water storage water heater comprising a hot-water supply pipe connected to an upper part of the hot-water storage tank for discharging hot water in the hot-water storage tank, and the right-side heat insulating material includes an upper part of the hot-water storage tank. The upper part of the right side heat insulating material covering the upper part of the hot water storage tank, the lower part of the right side heat insulating material covering the lower part of the hot water storage tank, and the left side heat insulating material cover the upper part of the left side heat insulating material covering the upper part of the hot water storage tank and the lower part of the hot water storage tank. The left side The right side heat insulating material has a foam expansion ratio at the right side heat insulating material upper portion near the hot water pipe and the right side heat insulating material lower portion near the water supply pipe, and the left side heat insulating material is The foaming ratio is different between the upper part of the left side heat insulating material near the hot water pipe and the lower part of the left side heat insulating material near the water supply pipe, and at least the upper part near the hot water pipe is more than the lower part near the water supply pipe. The heat insulating materials having different expansion ratios were integrally molded so that the expansion ratio was low.

  Also, a first hot water tank and a second hot water storage tank for storing hot water heated by the heating means, a right side heat insulating material covering the right half of the first hot water storage tank and the second hot water storage tank, and a left side surface covering the left half A heat insulating material, an upper surface heat insulating material covering the upper portion, a lower surface heat insulating material covering the lower portion, a hot water discharge pipe for discharging hot water in the first hot water storage tank connected to the upper portion of the first hot water storage tank, and the second hot water storage tank A foamed plastic comprising the water supply pipe for supplying water to the second hot water storage tank connected to the lower part, and a tank connection pipe for connecting the lower part of the first hot water storage tank and the upper part of the second hot water storage tank to prevent heat dissipation of hot water In the right side heat insulating material and the left side heat insulating material of the system, in order to prevent heat exchange between the first hot water storage tank and the second hot water storage tank, inter-tank convex portions covering between the tanks are respectively provided. The hot water storage hot water heater I had The right side heat insulating material includes a right side heat insulating material front portion covering the first hot water storage tank side, a right side heat insulating material rear portion covering the second hot water storage tank side, and the left side heat insulating material includes the first side heat insulating material. A left side heat insulating material front portion covering the hot water storage tank side and a left side heat insulating material rear portion covering the second hot water storage tank side; and the right side heat insulating material includes the right side heat insulating material front portion and the left side heat insulating material. The expansion ratio of the heat insulating material is different at the rear part, and the left side heat insulating material has different expansion ratios of the heat insulating material at the left side heat insulating material front part and the left side heat insulating material rear part, and at least the right side heat insulating material front part. And the heat insulating material of a different foaming ratio was integrally molded so that the foaming ratio might become lower in the front part of the left side heat insulating material and the rear part of the right side heat insulating material and the left side heat insulating material.

  Further, the convex portion between the tanks of the right side heat insulating material is a heat insulating material having substantially the same expansion ratio as that of the front portion of the right side heat insulating material, and is molded integrally with the right side heat insulating material. The inter-tank convex portion of the heat insulating material is a heat insulating material having substantially the same expansion ratio as that of the front portion of the left side heat insulating material, and is formed integrally with the left side heat insulating material.

  In addition, the foaming ratio of the hot water storage tank is continuously lowered along a path along which hot water flows from the water supply pipe to the hot water discharge pipe.

  According to this invention, hot water is stored at a relatively high temperature, and only the upper part of the hot water storage tank near the outlet pipe is covered with the upper part of the right side heat insulating material and the upper side of the left side heat insulating material with high heat insulation performance and low foaming ratio. Heat insulation from the upper part of the tank where the foam is stored can be prevented by a heat insulating material with a low expansion ratio, and the heat insulation effect can be enhanced. By using the material and the left side heat insulating material, it is possible to suppress an increase in the number of parts for manufacturing a plurality of heat insulating materials having different expansion ratios, and to prevent an increase in manufacturing cost due to an increase in man-hours.

  In addition, the first hot water storage tank for storing hot water of relatively high temperature is covered with the front part of the right side heat insulating material and the front side of the left side heat insulating material having a low foaming ratio and high heat insulating performance, so that the first amount of heat is stored most. Heat insulation from the hot water storage tank can be prevented by a heat insulating material having a low expansion ratio to enhance the heat insulating effect, and the heat insulating material of the first hot water storage tank and the heat insulating material of the second hot water storage tank, which are heat insulating materials having different expansion ratios, Is used as the right side heat insulating material and the left side heat insulating material, thereby suppressing an increase in the number of parts for manufacturing a plurality of heat insulating materials having different foaming ratios, and increasing the number of steps increases the manufacturing cost. Can be prevented.

  Further, since the convex portion between the tanks is the same heat insulating material as the front portion of the right side heat insulating material and the front portion of the left side heat insulating material, which has a low foaming ratio of the first hot water storage, the first hot water tank and the second hot water storage tank. It is possible to reliably prevent heat exchange between the tanks and collapse of the temperature stratification of the hot water in the hot water storage tank.

Schematic configuration diagram of a hot water storage type water heater of the first embodiment of the present invention Schematic configuration diagram of a hot water storage type water heater of the first embodiment of the present invention Configuration diagram of molded heat insulating material and hot water storage tank of first embodiment of the present invention The block diagram of the molding heat insulating material of 1st embodiment of this invention Schematic configuration diagram of a hot water storage type water heater of a second embodiment of the present invention Configuration diagram of molded heat insulating material and hot water storage tank of second embodiment of the present invention The block diagram of the molding heat insulating material of 2nd embodiment of this invention The exploded sectional view which looked at the heat insulating material of the second embodiment of the present invention from the upper part.

Next, a first embodiment of the present invention will be described with reference to the drawings.
1 is a tank unit for storing hot water, and 2 is a heat pump type heating means for storing hot water in the tank unit 1 and supplying hot water from a hot water tap 3 when a hot water supply is requested.

  Next, the tank unit 1 will be described with reference to the schematic diagram of FIG. 2. 4 is a hot water storage tank, 5 is a water supply pipe connected to the lower part of the hot water storage tank 4, and 6 is connected to the upper part of the hot water storage tank 4. The hot water supply pipe, 7 is a water supply bypass pipe that branches in the middle of the water supply pipe 5, and 8 is a hot water supply that mixes hot water flowing through the hot water supply pipe 6 and city water flowing through the water supply bypass pipe 7 at an appropriate ratio to adjust the hot water supply set temperature. A mixing valve, 9 is a hot water supply pipe through which the mixed water mixed by the hot water supply mixing valve 8 flows, 10 is a heating forward pipe connecting the lower part of the hot water storage tank 4 and the inflow side of the heating means 2, and 11 is an upper part of the hot water storage tank 4 and the heating means. A heating return pipe 12 connecting the outflow side of 2 is a heating circulation pump which is provided in the middle of the heating forward pipe 10 and circulates the hot water in the heating means 2 and the hot water storage tank 4 to exchange heat.

  Reference numeral 13 denotes a control device responsible for operation control of the hot water supply operation. The control device 13 includes a heating operation control means 14 for controlling the heating circulation pump 12 and the heating means 2 during the heating operation to perform the heating operation. Is provided.

Next, the boiling operation of the hot water storage type water heater will be described.
When a boiling request is generated, the boiling operation control means 14 drives the heating circulation pump 12 and also drives the heating means 2 so that the lower part of the hot water storage tank 4 taken out from the lower part of the hot water storage tank 4 through the heating forward pipe 10. Is heated by the heating means 2. Then, the hot water heated by the heating means 2 so as to reach a predetermined boiling temperature is stored in a stacked form from the upper part of the hot water storage tank 4 through the heating return pipe 11 and heated while being circulated by the circulation pump 12. By repeating the above, the hot water storage tank 4 is made hot.

  Next, the hot water supply operation will be described. When the hot-water tap 3 is opened and hot water is supplied, the pressure on the hot-water supply pipe 9 side decreases, the water supply from the water supply pipe 5 is supplied from the lower part of the hot water storage tank 4, and the hot water in the high temperature layer at the upper part of the hot water storage tank 4 6 is pushed out. On the other hand, the water supply from the water supply pipe 5 is mixed with the hot water from the hot water discharge pipe 6 by the hot water supply mixing valve 8 through the water supply bypass pipe 7 and supplied to the hot water tap 3 through the hot water supply pipe 9. Thus, in the hot water storage tank 4, the hot water supply operation is performed, so that the water from the water supply pipe 5 is formed on the lower layer side and the hot water pushed up by the water supply is formed on the upper layer side. The upper part of the hot water storage tank 4 becomes hot water, and the lower part of the hot water storage tank 4 becomes low temperature water.

Next, a first embodiment will be described with reference to FIGS.
By the boiling operation and the hot water supply operation, hot water in the high temperature layer is stored in the upper part of the hot water storage tank 4 and hot water in the low temperature layer is stored in the lower part. In general, in order to prevent heat dissipation from the hot water storage tank 4 for storing hot water to the outside of the tank, the hot water storage tank 4 is covered with a heat insulating material made of heat-resistant foamed polystyrene. The heat insulating material covers the side surface of the hot water storage tank 4 by combining the right side heat insulating material 15 covering the right half of the hot water storage tank 4 and the left side heat insulating material 16 covering the left half, and the upper surface heat insulating material 17 and the lower surface heat insulating material 18. By covering the upper and lower sides with, the entire circumference of the hot water storage tank 4 is covered.

  The heat insulating material made of heat-resistant foamed polystyrene is foamed about 30 to 80 times by pre-foaming raw material beads made of polystyrene resin and hydrocarbon-based foaming agent, filling the mold and heating. Is molded. Insulating materials with different expansion ratios can be made by setting different expansion ratios in the pre-foamed state.For example, in the case where the expansion ratio is changed above and below the heat insulating material as in the first embodiment, pre-expanding is performed at a low magnification. Filling the upper part of the mold with the pre-foamed foam at a high magnification, filling the lower part of the mold and heating, to form a heat insulating material with parts of different expansion ratio in one heat insulating material It can be made, and it can be set as the heat insulating material with high heat insulation performance by making low the foaming magnification of the location where heat insulation is especially required.

  In addition, since the heat insulation performance is required to be high on the high temperature layer side, the heat dissipation of the hot water stored in the hot water is reliably suppressed by lowering the expansion ratio. Instead, by increasing the foaming ratio and molding the heat insulating material with a small amount of polystyrene, the molding cost of the heat insulating material can be reduced.

  In the first embodiment, the side surface is covered with the right side heat insulating material 15 and the left side heat insulating material 16, and the upper and lower sides of the hot water storage tank 4 are covered with the upper surface heat insulating material 17 and the lower surface heat insulating material 18. Covering. The right side heat insulating material 15 is a heat insulating material obtained by integrally molding a right side heat insulating material upper portion 15a covering the upper portion and a right side heat insulating material lower portion 15b covering the lower portion. A low heat insulating material is used, and the right side heat insulating material lower portion 15b uses a heat insulating material having a higher expansion ratio than the right side heat insulating material upper portion 15a, so that the expansion ratio is different between the upper and lower sides. Similarly, the left side heat insulating material 16 is a heat insulating material obtained by integrally molding a left side heat insulating material upper portion 16a covering the upper portion and a left side heat insulating material lower portion 16b covering the lower portion.

  Thus, the upper part of the hot water storage tank 4 near the hot water pipe 6 where hot water of relatively high temperature is stored is covered with the right side heat insulating material upper part 15a and the left side heat insulating material upper part 16a with low foaming ratio and high heat insulating performance, The hot water storage tank 4 is covered with a right side heat insulating material lower portion 15b and a left side heat insulating material lower portion 16b having high foaming ratio and low heat insulating performance at the lower part of the hot water storage tank 4 near the water supply pipe 5 where hot water of relatively low temperature is stored. By making the foaming ratios different from each other, the heat insulation effect of the relatively hot water close to the hot water discharge pipe 6 at the upper part of the hot water storage tank 4 can be enhanced, and the right side heat insulating material upper part 15a and the right side heat insulating material lower part 15b The left side heat insulating material lower portion 16a and the left side heat insulating material lower portion 16b are integrally molded, thereby suppressing an increase in the number of parts, such as manufacturing a plurality of heat insulating materials having different foaming ratios, and increasing man-hours. It can be prevented from being increased manufacturing costs in Rukoto.

Next, the tank unit 1 of 2nd Embodiment is demonstrated based on the schematic of FIG. Here, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
Reference numeral 19 denotes a first hot water storage tank, 20 denotes a second hot water storage tank, 21 denotes a tank connection pipe connecting the lower part of the first hot water storage tank 19 and the upper part of the second hot water storage tank 20, and 22 denotes the lower part of the second hot water storage tank 20 and the heater 2. A two-side heater forward pipe 23 connecting the inflow side, and a one-side heater return pipe connecting the upper portion of the first hot water storage tank 19 and the outflow side of the heater 2.

The boiling operation of the two-can type water heater will be described.
The hot water flowing into the heater 2 from the lower part of the second hot water storage tank 20 via the two-side heater outgoing pipe 22 and heated to a high temperature by the heater 2 passes through the two-side heater return pipe 23 and passes through the first hot water storage tank. It flows into the tank 19. Thus, boiling is performed by circulating the heater 2 and the first and second storage tanks. The hot water stored in the second hot water storage tank 20 is once stored in the first hot water storage tank 19 and then stored in the second hot water storage tank 20 via the tank connection pipe 21. The hot water having a relatively high temperature that is not dissipated from the hot water in the second hot water storage tank 20 is stored.

Next, a two-can type hot water supply operation will be described.
When the hot-water tap 3 is opened, the hot water in the first hot water storage tank 19 is pushed out by the water supply pressure by the water supply, and the hot water stored in the first hot water storage tank 19 and the water supplied from the water supply bypass pipe 7 are combined. And the mixed water mixed is fed from the hot water tap 3. At this time, hot water in the second hot water storage tank 20 flows into the first hot water storage tank 19 via the tank connection pipe 21 by the amount of hot water flowing out from the first hot water storage tank 19 at the same time as the hot water supply. Water corresponding to the outflowed hot water is supplied from the water supply pipe 5 to the second hot water storage tank 20.

  Then, when hot water is supplied for a while, when all the hot water accumulated in the second hot water storage tank 20 is pushed out by the water supply pressure, all the hot water in the second hot water storage tank 20 via the tank connection pipe 21 is first hot water storage. A relatively high temperature hot water is stored in the first hot water storage tank 19 and only the supplied water is stored in the second hot water storage tank 20.

Next, the heat insulating material of 2nd Embodiment is demonstrated in detail using FIG. 6, FIG.
In the second embodiment, the right side heat insulating material 15 is close to the outlet pipe 6, and the right side heat insulating material front portion 15 c covering the first hot water storage tank 19 where hot water having a relatively high temperature is stored is relatively close to the water supply pipe 5. A heat insulating material formed integrally with the right side heat insulating material rear portion 15d covering the second hot water storage tank 20 in which low temperature hot water is stored is used, and the right side heat insulating material front portion 15c uses a heat insulating material with a low expansion ratio. The right side heat insulating material rear portion 15d uses a heat insulating material having a higher expansion ratio than the right side heat insulating material front portion 15c, and the expansion ratio is different for each tank. Similarly, the left side heat insulating material 16 is also close to the hot water discharge pipe 6 and is close to the left side heat insulating material front portion 16c and the water supply pipe 7 covering the first hot water storage tank 19 where hot water is stored at a relatively high temperature. This is a heat insulating material formed integrally with the left side lower heat insulating material 16d covering the second hot water storage tank 20 to store hot water.

FIG. 8 is an exploded sectional view of the tank unit 1 as viewed from above.
In order to prevent the temperature stratification from collapsing due to heat exchange between the adjacent first hot water storage tank 19 and second hot water storage tank 20, the right side heat insulating material 15 and the left side surface are not in contact with each other to prevent heat exchange. The inter-tank convex portion 24 is formed integrally with the heat insulating material 16. The inter-tank convex portion 24 is made of a heat insulating material having a foaming ratio substantially the same as that of the right side heat insulating material front part 15c and the left side heat insulating material front part 15d having a low foaming rate, so that the expansion ratio is low and the heat insulating performance is high. The convex portion 24 can reliably prevent heat exchange between the tanks.

  Thus, the first hot water storage tank 19 for storing hot water of relatively high temperature close to the hot water discharge pipe 6 is covered with the right side heat insulating material front portion 15c and the left side heat insulating material front portion 16c having a low expansion ratio and high heat insulating performance, The second hot water storage tank 20 for storing hot water having a relatively low temperature close to the water supply pipe 5 includes a right side heat insulating material rear portion 15d having a higher foaming ratio than the right side heat insulating material front portion 15c and a left side heat insulating material front portion 16c. By covering with the left side heat insulating material rear part 16d having a high foaming ratio, the heat insulating effect of the relatively hot water in the first hot water storage tank 19 can be enhanced, and the right side heat insulating material front part 15c and the right side heat insulating material Since the rear portion 15d, the left side heat insulating material front portion 16c and the left side heat insulating material rear portion 16d are integrally molded, an increase in the number of parts of manufacturing a plurality of heat insulating materials having different expansion ratios is suppressed, and the number of man-hours is reduced. Increase production It is possible to prevent the door will up.

  The present invention is not limited to the embodiment, and does not prevent modification without changing the gist. For example, in the first embodiment, the temperature stratification of the hot water storage tank 4 is performed at a relatively high temperature. The upper and lower heat insulation parts 15a and 15b are divided into two parts, the upper part and the lower part of the lower temperature, and the flow path of hot water from the water supply pipe to the tapping pipe. A configuration in which the expansion ratio continuously decreases along the line may be used.

  Further, although the heat pump type heating means 2 has been described in the embodiment of the present invention, an electric water heater provided with a heater may be used.

DESCRIPTION OF SYMBOLS 1 Tank unit 2 Heater 4 Hot water storage tank 5 Water supply pipe 6 Outlet pipe 15 Right side heat insulating material 15a Right side heat insulating material upper part 15b Right side heat insulating material lower part 15c Right side heat insulating material front part 15d Right side heat insulating material rear part 16 Left side heat insulating material 16a Left side heat insulating material upper part 16b Left side heat insulating material lower part 16c Left side heat insulating material front part 16d Left side heat insulating material rear part 17 Upper surface heat insulating material 18 Lower surface heat insulating material 19 First hot water storage tank 20 Second hot water storage tank 21 Tank connection pipe 22 Two sides Heating pipe 23 One side heating return pipe 24 Convex part between tanks

Claims (4)

At least one hot water storage tank for storing hot water heated by the heating means; and a right side heat insulating material covering the right half of the hot water storage tank, which is a foamed plastic heat insulating material that prevents heat dissipation of the hot water in the hot water storage tank; A left side heat insulating material covering the left half, an upper surface heat insulating material covering the upper part, a lower surface heat insulating material covering the lower part, a water supply pipe connected to the lower part of the hot water storage tank for supplying water into the hot water storage tank, and the hot water storage In the hot water storage type water heater provided with a hot water pipe connected to an upper part of the hot water storage tank for discharging hot water in the tank, the right side heat insulating material includes an upper right side heat insulating material covering the upper part of the hot water storage tank and the hot water storage. The lower part of the right side heat insulating material covering the lower part of the tank, the left side heat insulating material, the upper part of the left side heat insulating material covering the upper part of the hot water storage tank and the lower part of the left side heat insulating material covering the lower part of the hot water storage tank, Right side cut The material has a different foaming ratio between the upper part of the right side heat insulating material near the hot water pipe and the lower part of the right side heat insulating material near the water supply pipe, and the left side heat insulating material is the upper part of the left side heat insulating material near the hot water pipe. And the left side heat insulating material lower part near the water supply pipe have different foaming ratios, and at least the upper part near the hot water pipe has a lower foaming ratio than the lower part near the water supply pipe. A hot water storage type water heater characterized by integrally molding a heat insulating material. A first hot water storage tank and a second hot water storage tank for storing hot water heated by the heating means; a right side heat insulating material covering the right half of the first hot water storage tank and the second hot water storage tank; and a left side heat insulating material covering the left half. An upper surface heat insulating material covering the upper part, a lower surface heat insulating material covering the lower part, a hot water pipe for discharging hot water in the first hot water storage tank connected to the upper part of the first hot water storage tank, and a lower part of the second hot water storage tank The water supply pipe for supplying water to the connected second hot water storage tank, the tank connection pipe for connecting the lower part of the first hot water storage tank and the upper part of the second hot water storage tank, and a foamed plastic system that prevents heat dissipation of hot water The right side heat insulating material and the left side heat insulating material respectively have inter-tank convex portions that cover between the tanks in order to prevent heat exchange between the first hot water storage tank and the second hot water storage tank. In the hot water storage water heater The right side heat insulating material includes a right side heat insulating material front portion covering the first hot water storage tank side, a right side heat insulating material rear portion covering the second hot water storage tank side, and the left side heat insulating material includes the first hot water storage tank. A left side heat insulator front part covering the side and a left side heat insulator rear part covering the second hot water storage tank side, and the right side heat insulator is the right side heat insulator front part and the right side heat insulator rear part. The heat insulating material has a different expansion ratio, and the left side heat insulating material has different expansion ratios of the heat insulating material between the left side heat insulating material front and the left side heat insulating material rear, and at least the right side heat insulating material front and the left side. Hot water storage type hot water supply, wherein heat insulating materials with different foaming ratios are integrally molded so that the front surface insulating material has a lower foaming ratio than the right side heat insulating material and the left side heat insulating material rear part. Machine. The convex part between the tanks of the right side heat insulating material is a heat insulating material having an expansion ratio substantially the same as the front part of the right side heat insulating material, and is molded integrally with the right side heat insulating material. The said convex part between tanks is a heat insulating material of the expansion ratio substantially the same as the front part of the said left side surface heat insulating material, It was what was integrally molded to the said left side heat insulating material. Hot water storage water heater. The expansion ratio of the hot water storage tank is continuously reduced along a path along which hot water flows from the water supply pipe to the hot water discharge pipe. The hot water storage water heater described.

Images