JP2011075160A - Instantaneous hot water system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instantaneous hot water system filling a hot water storage part with hot water in a short time according to the temperature of water supplied from a water heater while coping with the case where a long passage is formed from the water heater without enlarging the capacity of the hot water storage part. <P>SOLUTION: This instantaneous hot water system QW includes a selector valve 30 switching a passage to the first passage 12 side when water of a first temperature or higher is supplied from the water heater HW side and to the second passage 14 side when water lower than the first temperature is supplied, and a thermostat valve 34 regulating the quantity of water supplied from the first passage 12 and the quantity of water supplied from the second passage 14 so that water supplied to a passage 16 extending to a faucet FC is close to a second temperature. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an immediate hot water system disposed between a water heater and a faucet.

  As an immediate hot water system that can supply hot water immediately when a faucet is opened at a hot water supply station, a hot water supply pipe connected to a hot water supply pipe and a hot water supply pipe leading to the hot water supply station are connected to this hot water supply pipe. Some have a circulation path formed by connecting a tapping pipe with a return pipe provided with a circulation pump. In this circulation type instant hot water system, when the faucet is closed and hot water is not used, the hot water supply device and the circulation pump are operated to perform a circulating heat insulation operation for circulating hot water at a predetermined temperature in the circulation path. When hot water is opened and used, hot water is immediately supplied to the hot water supply location.

  In addition, an immediate hot water pot having a heat insulation heating element is disposed between the main water heater and the faucet, and a hot water supply pipe from the main hot water heater is directly connected to the lower portion of the immediate hot water pot so that the hot water supply pipe from the initial stage of the hot water supply is connected. A hot water storage system that guides all of the cold water into the instant hot water pot, mixes the guided cold water and the hot water in the instant hot water pot in the immediate hot water pot, removes it from the outlet at the top of the immediate hot water pot, and discharges it from the faucet. There is also an instant hot water system.

  In the hot water storage type hot water system, the hot water stored in the hot water pot is pushed up by the cold water flowing from the bottom at the beginning of the hot water, and only the hot water is taken out from the upper hot water outlet and flows out from the hot water outlet as it is. Therefore, the hot water may be discharged as it is in the faucet. Therefore, the bypass path that branches off from the hot water supply pipe from the main water heater to the immediate hot water pot faces the hot water outlet, and the cold water from the hot water supply pipe in the initial stage of hot water is branched into the bypass side and the immediate hot water pot side. There has also been proposed an instant hot water system in which hot water in a hot water pot and cold water from a bypass channel are mixed at a tap outlet and supplied to a faucet (see, for example, Patent Document 1 below).

  However, in a circulating hot water storage system, additional parts such as a circulation pump increase the cost. Moreover, in the hot water storage type hot water storage system, in addition to the cost of parts such as an electric heater, a pressure reducing valve or the like is used to prevent the instant hot water pot from being damaged by water pressure by releasing the expansion water and pressure generated when heating the water. However, there is a problem that the safety device becomes expensive. Further, in addition to these initial costs, continuing to operate the circulation pump and the electric heater not only requires maintenance costs such as electricity costs, but is also not preferable from the viewpoint of environmental conservation such as measures against global warming.

  Thus, a hot water storage system that does not use an electric heater or the like has been proposed (see Patent Document 2 below). The hot water storage system described in the following Patent Document 2 includes a hot water storage portion having heat insulation disposed in the middle of a hot water supply pipe connecting a water heater and a faucet. Specifically, when the temperature of the water sent from the hot water supply side is lower than a predetermined temperature, the main water in the hot water supply pipe is supplied into the hot water storage part, and the residual water pushed out from the hot water storage part is plugged. When the temperature of the water supplied from the hot water supply side is higher than the predetermined temperature, a part of the hot water in the hot water supply pipe is supplied into the hot water storage section, and the residual water pushed out from the hot water storage section and the hot water supply pipe The hot water fed directly without going through the hot water storage section is mixed and supplied to the faucet.

JP-A-1-266463 JP 2009-52884 A

  In the instant hot water system described in Patent Document 2, when water lower than a predetermined temperature is supplied from the hot water supply side, a certain percentage (for example, approximately 100%) of water is supplied into the hot water storage section. It was. For this reason, from the viewpoint of ensuring quick hot water properties, it is necessary to secure a hot water storage amount corresponding to the amount of water for the length of the flow path from the water heater to the hot water storage section, and there is a flow path from the water heater to the hot water storage section. There is a concern that the hot water storage section becomes larger when it is assumed to be longer. In the instant hot water system described in Patent Document 2, when water higher than a predetermined temperature is supplied from the hot water supply side, a certain proportion (for example, approximately 20%) of water is supplied into the hot water storage section. It was. Therefore, regardless of the temperature of the water supplied from the water heater side, without the use of a predetermined amount or more of water in the hot water storage unit is not filled with warm water. If the water supplied from the water heater side is, for example, 60 ° C. and 50 ° C., if the water faucet is mixed with normal temperature water as water having a temperature of about 40 ° C., the faucet The amount of water required is less at 60 ° C., and as a result, more water can be supplied to the hot water storage than at 50 ° C. However, in the above-described conventional technology, since a fixed amount of water is supplied to the hot water storage unit, the supply amount in the case of lower-temperature 50 ° C. water is supplied to the hot water storage unit as a reference. It took a lot of time to complete the hot water storage.

  The present invention has been made in view of such problems, and the object thereof can be dealt with when a long flow path is formed from the water heater without increasing the capacity of the hot water storage section. An object of the present invention is to provide an instant hot water system that can fill a hot water storage section with warm water in a short time according to the temperature of water supplied from a water heater.

  In order to solve the above problems, an immediate hot water system according to the present invention is an immediate hot water system disposed between a water heater and a faucet, and includes a first flow path and a second flow that are provided independently of each other. A branch that divides a channel, a third channel connecting the middle of the first channel and the second channel, and a channel extending from the water heater side into the first channel and the second channel A joining portion that joins the first passage and the second passage and connects to the passage extending to the faucet, and a hot water storage portion that can store water and has heat insulation, The three flow paths are formed so as to communicate the first flow path and the inside of the hot water storage section, and to communicate the second flow path and the inside of the hot water storage section, and the flow path switching means provided in the branch section includes the hot water supply When water at a first temperature or higher is supplied from the vessel side, the flow path is switched to the first flow path side, while the first When water having a temperature lower than that is supplied, the flow path is switched to the second flow path side, and the temperature adjusting means provided in the merging portion is configured so that the water supplied to the flow path extending to the faucet is first. The amount of water supplied from the first flow path and the amount of water supplied from the second flow path are adjusted so as to approach two temperatures, and the water mixed in the junction is the second temperature. If it is less than, increase the amount of water supplied from the first flow path and reduce the amount of water supplied from the second flow path, and when the water mixed in the junction is higher than the second temperature , characterized in that it is configured to increase the amount of water supplied from the second flow path while reducing the amount of water supplied from the first flow path.

  In the present invention, in the branch portion, when water having a temperature lower than the first temperature is supplied from the hot water heater side, the flow path switching means switches the flow path to the second flow path side, so the water supplied from the hot water heater side is It flows into the second flow path. Therefore, the water that is supplied from the hot water heater side and passes through the second flow path and the water that is pushed out of the hot water storage section by the water that flows from the second flow path into the third flow path and passes through the first path is supplied to the junction. And flows. On the other hand, when water having a temperature equal to or higher than the first temperature is supplied from the water heater side, the channel switching means switches the channel to the first channel side, so that the water supplied from the water heater side flows through the first channel. Therefore, in the junction part, water supplied from the hot water supply side and passing through the first flow path, and water pushed out of the hot water storage part by water flowing from the first flow path into the third flow path and passing through the second flow path, Flows in.

  The water flowing through the first flow path and the second flow path described above flows into the joining portion, and the flow rate flowing out from each flow path to the flow path extending to the water faucet is adjusted by the temperature adjusting means. The temperature adjusting means increases the amount of water supplied from the first flow path and decreases the amount of water supplied from the second flow path when the water mixed at the junction becomes less than the second temperature, The flow rate is adjusted so that the temperature of the water supplied to the extending flow path approaches the second temperature. Therefore, when relatively low temperature water is supplied from the water heater via the second flow path, the water directly supplied from the second flow path to the junction is also increased while increasing the ratio of flowing into the hot water storage section. Since it can ensure, the warm water in a hot water storage part can be utilized effectively compared with the case where all the water is sent to a hot water storage part.

  Further, the temperature adjusting means reduces the amount of water supplied from the first flow path and increases the amount of water supplied from the second flow path when the water mixed at the junction is higher than the second temperature. The flow rate is adjusted so that the temperature of the water supplied to the flow path extending to the second temperature approaches the second temperature. Therefore, when relatively high temperature water is supplied from the water heater via the first flow path and relatively low temperature water is stored in the hot water storage section, the first flow path directly enters the merge section. While securing the supplied water, it can flow into the hot water storage part, push out the water in the hot water storage part, and supply it from the second flow path to the confluence part, so that warm water can be efficiently stored in the hot water storage part. it can. In addition, when water having a temperature lower than that of relatively high temperature is supplied from the water heater via the first channel, the amount of water directly supplied from the first channel to the junction is increased and supplied to the hot water storage unit. Therefore, warm water can be efficiently stored in the hot water storage section according to the temperature of the water supplied from the water heater.

  In the instant hot water system according to the present invention, it is also preferable that the second temperature is set to be higher than the first temperature. In this preferable aspect, when the temperature of the water supplied from the water heater is equal to or higher than the first temperature and lower than the second temperature, the temperature adjustment means increases the amount of water supplied from the first flow path and the second flow path. The flow rate is adjusted so that the temperature of the water supplied to the flow path extending to the water faucet approaches the second temperature by reducing the amount of water supplied from. Therefore, when the temperature of the water supplied from the water heater does not exceed the second temperature, the water can be continuously supplied from the first flow path to the faucet side, and the water temperature supplied from the water heater is kept to the faucet. Can be supplied with.

  According to the present invention, it is possible to cope with a case in which a long flow path is formed from a water heater without increasing the capacity of the hot water storage section, and a short time according to the temperature of water supplied from the water heater. Thus, it is possible to provide an immediate hot water system capable of filling warm water in the hot water storage section.

It is a figure for demonstrating the basic concept in embodiment of this invention. It is a figure for demonstrating the basic concept in embodiment of this invention. It is a schematic block diagram which shows the structure of the instant hot water system which is embodiment of this invention. It is a schematic block diagram for demonstrating operation | movement of the instant hot water system shown in FIG. It is a schematic block diagram for demonstrating operation | movement of the instant hot water system shown in FIG. It is a schematic block diagram for demonstrating operation | movement of the instant hot water system shown in FIG. It is a schematic block diagram for demonstrating operation | movement of the instant hot water system shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  Prior to describing the embodiments of the present invention, the basic concept of immediate hot water system, which is the embodiment of the present invention will be described with reference to FIGS. The instant hot water system of the present embodiment is arranged between the water heater HW and the faucet FC, and supplies hot water immediately when water is discharged from the faucet FC. Figure 1 is a diagram for explaining a basic concept in the embodiments of the present invention, the water supplied from the water heater HW is a diagram showing a case of a low temperature. FIG. 2 is a diagram illustrating a case where the water supplied from the water heater HW is at a high temperature. In the faucet FC shown in FIG. 1 and FIG. 2, hot water at 38 ° C. to 43 ° C. is discharged in response to supply of hot water (not shown) and supply of water (not shown). Accordingly, the supply temperature on the hot water side to the faucet FC shown in FIGS. 1 and 2 only needs to be slightly higher than 38 ° C. to 43 ° C., which is the actual use temperature, and in this embodiment, 45 ° C. Assumed.

  As shown in FIG. 1A, when water at 20 ° C. is supplied from the water heater HW and water at 60 ° C. is stored in the hot water storage section WT, the water heater HW with respect to the faucet FC. The ratio of water supplied from the side to water supplied from the hot water storage section WT is set to 3: 7, and water at approximately 45 ° C. is supplied to the faucet FC. In this case, the remaining water supplied from the water heater HW is supplied to the hot water storage section WT, and 60 ° C. water pushed out by this supply is supplied to the faucet FC side.

  As shown in FIG. 1B, when water at 20 ° C. is supplied from the water heater HW and water at 50 ° C. is stored in the hot water storage section WT, the water heater HW with respect to the faucet FC. The ratio of water supplied from the side to water supplied from the hot water storage section WT is set to 2: 8, and water at approximately 45 ° C. is supplied to the faucet FC. In this case, the remaining water supplied from the water heater HW is supplied to the hot water storage section WT, and 50 ° C. water pushed out by this supply is supplied to the faucet FC side.

  As shown in FIG. 1C, when water at 20 ° C. is supplied from the water heater HW and water at 47 ° C. is stored in the hot water storage section WT, the water heater HW with respect to the faucet FC. The ratio of water supplied from the side to water supplied from the hot water storage section WT is set to 1: 9, and water at approximately 45 ° C. is supplied to the faucet FC. In this case, the remaining water supplied from the water heater HW is supplied to the hot water storage section WT, and 47 ° C. water pushed out by this supply is supplied to the faucet FC side.

  As shown to (a)-(c) of FIG. 1, according to the temperature of the water currently stored by the hot water storage part WT, the mixing ratio with the water directly supplied to the faucet FC from the water heater HW is adjusted. Thus, the water stored in the hot water storage section WT is effectively used, and water at a target temperature is stably supplied to the faucet FC. Compared to the case where all the water supplied from the water heater HW is supplied to the hot water storage unit WT and the water in the hot water storage unit WT is pushed out without such a device, the water consumption in the hot water storage unit WT is reduced. Can be suppressed. Therefore, it is possible to cope with the case where the pipe length from the water heater HW is longer than the length corresponding to the internal capacity of the hot water storage section WT.

  As shown in FIG. 2A, when water at 60 ° C. is supplied from the water heater HW and water at 20 ° C. is stored in the hot water storage section WT, the water heater HW with respect to the faucet FC. The ratio of water supplied from the side to water supplied from the hot water storage section WT is set to 7: 3, and water at approximately 45 ° C. is supplied to the faucet FC. In this case, the remaining water supplied from the water heater HW is supplied to the hot water storage section WT, and 20 ° C. water pushed out by this supply is supplied to the faucet FC side.

  As shown in FIG. 2B, when water at 50 ° C. is supplied from the water heater HW and water at 20 ° C. is stored in the hot water storage section WT, the water heater HW with respect to the faucet FC. The ratio of water supplied from the side to water supplied from the hot water storage section WT is set to 8: 2, and water at approximately 45 ° C. is supplied to the faucet FC. In this case, the remaining water supplied from the water heater HW is supplied to the hot water storage section WT, and 20 ° C. water pushed out by this supply is supplied to the faucet FC side.

  As shown in FIG. 2C, when water at 45 ° C. is supplied from the water heater HW and water at 20 ° C. is stored in the hot water storage section WT, the water heater HW with respect to the faucet FC. The ratio of water supplied from the side to water supplied from the hot water storage section WT is set to 10: 0, and water at approximately 45 ° C. is supplied to the faucet FC. In this case, all the water supplied from the water heater HW is supplied to the faucet FC side and is not supplied to the hot water storage section WT.

  As shown in FIGS. 2A to 2C, the mixing ratio with the water directly supplied from the water heater HW to the faucet FC is adjusted according to the temperature of the water stored in the hot water storage section WT. Thus, water can be effectively stored in the hot water storage section WT, and water at a target temperature is stably supplied to the faucet FC. Compared to the case where a certain percentage (for example, 20%) of water supplied from the water heater HW is supplied to the hot water storage unit WT without pushing out the water in the hot water storage unit WT without such a device. High temperature water can be efficiently stored in the WT.

  The embodiment of the present invention is for realizing the concept as described above. Subsequently, an immediate hot water system QW according to an embodiment of the present invention will be described with reference to FIG. FIG. 3 is a schematic configuration diagram of the immediate hot water system QW.

  As shown in FIG. 3, the immediate hot water system QW is disposed between the water heater HW and the faucet FC, and when hot water discharge is started from the faucet FC, there is no time lag as much as possible. It is a system for supplying. The water heater HW is supplied with room temperature water from the water supply pipe W <b> 1 and heated, and the water after overheating is sent out to the flow path 10. The faucet FC is supplied with high-temperature water from the flow path 16 and is supplied with normal temperature water from the water supply pipe W2, and mixes and discharges the water.

  The immediate hot water system QW includes a first flow path 12 and a second flow path 14 provided independently of each other. The 1st flow path 12 and the 2nd flow path 14 are branched and formed from the branch part 101 which branches the flow path 10 extended from the water heater HW. The first flow path 12 and the second flow path 14 merge at the merge portion 161 and are connected to the flow path 16 extending to the faucet FC. The immediate hot water system QW includes a first branch channel 20 that branches from an intermediate part 121 in the middle of the first channel 12, and a second branch channel 18 that branches from an intermediate part 141 in the middle of the second channel 14. have. The first branch flow path 20 communicates with the hot water storage section 32, and the second branch flow path 18 communicates with the hot water storage section 32. Accordingly, the first branch channel 20 and the second branch channel 18 connect the intermediate part 121 of the first channel 12 and the intermediate part 141 of the second channel 14 and correspond to the third channel of the present invention. To do.

  The hot water storage section 32 is a tank capable of storing water therein, and is formed of a material having heat insulation properties or surrounded by a material having heat insulation properties, thereby having heat insulation properties as a whole. When water is supplied from the first branch flow path 20 and the second branch flow path 18 into the hot water storage section 32, the supply speed is reduced, and the water is distributed over the entire cross section that intersects the supply direction. . As a result, even when hot water is supplied from the first branch channel 20 and the second branch channel 18 into the hot water storage section 32 and low temperature water is already stored in the hot water storage section 32, The low-temperature water stored is pushed out without mixing them. Similarly, when low-temperature water is supplied into the hot water storage section 32 from the first branch flow path 20 and the second branch flow path 18 and high-temperature water is already stored in the hot water storage section 32, the stored high temperature. Water is pushed out.

  A switching valve 30 serving as a flow path switching unit is disposed at a branch portion 101 between the first flow path 12 and the second flow path 14. A valve body 301 is provided in the switching valve 30, and water is selectively supplied to one of the first flow path 12 and the second flow path 14 according to the temperature of water supplied from the flow path 10. As described above, one of the flow paths is fully closed. In the case of this embodiment, when water of 38 ° C. (first temperature) or more is supplied from the hot water heater HW side, the flow path is switched to the first flow path 12 side, and the second flow path 14 is fully closed. It is configured as follows. Further, when water of less than 38 ° C. (first temperature) is supplied from the water heater HW side, the flow path is switched to the second flow path 14 side, and the first flow path 12 is fully closed. ing.

  A thermostat valve 34 serving as a temperature adjusting means is disposed at a junction 161 between the first flow path 12 and the second flow path 14. A valve body 341 is provided in the thermostat valve 34, and the amount of water supplied from the first flow path 12 according to the temperature of the water supplied from each of the first flow path 12 and the second flow path 14, The amount of water supplied from the two flow paths 14 is adjusted, and the temperature is adjusted so as to be as close to 45 ° C. (second temperature) as possible. More specifically, the thermostat valve 34 increases the amount of water supplied from the first flow path 12 and decreases the amount of water supplied from the second flow path 14 when the water to be mixed is less than 45 ° C. When the water to be mixed is higher than 45 ° C., the amount of water supplied from the first flow path 12 is reduced and the amount of water supplied from the second flow path 14 is increased.

  Next, a specific operation of the instant hot water system QW will be described with reference to FIGS. 4, water heater HW water of less than 38 ° C. from the side is supplied, 50 ° C. water shows a case that has been stored in the hot water storage unit 32. The switching valve 30 into which water of less than 38 ° C. flows moves so that the valve body 301 fully closes the first flow path 12 and water flows to the second flow path 14 side. Flowing into the second flow path 14 side water is branched at an intermediate portion 141, a portion flows through the thermostat valve 34 side, and the remainder flows through the second branch flow channel 18 side. The water that has flowed to the second branch flow path 18 side flows into the hot water storage section 32 and pushes the water in the hot water storage section 32 to the first branch flow path 20. The water pushed out to the first branch flow path 20 flows into the first flow path 12 from the intermediate part 121 and flows to the thermostat valve 34 side.

  In the thermostat valve 34, water of 50 ° C. flowing from the first flow path 12 side and water of less than 38 ° C. flowing from the second flow path 14 side are mixed and sent out to the flow path 16 side as 45 ° C. water. . In the case of this embodiment, the valve body 341 moves so that the water from the first flow path 12 side is approximately 89% and the water from the second flow path 14 side is approximately 11%. The situation shown in FIG. 4 is a situation in which water discharge is started at the faucet FC and normal temperature water is still being supplied from the water heater HW.

  Subsequently, the situation shown in FIG. 5 shows a situation where the temperature of the water supplied from the water heater HW rises, less water 45 ° C. at over 38 ℃ is supplied. Switching valve 30 to over 38 ℃ 45 ° C. below the water flows, the valve body 301 is fully closed a second channel 14, is moved to the first flow path 12 side as water flows. The water that has flowed into the first flow path 12 side flows into the thermostat valve 34 side. In the thermostat valve 34, since the flow of water less than 45 ° C. 38 ° C. or higher, the valve body 341 to accept only water flowing from the first flow path 12 side moves.

  Subsequently, in the situation shown in FIG. 6, the temperature of the water supplied from the water heater HW rises, water of 45 ° C. or more and less than 60 ° C. is supplied, and water of less than 38 ° C. is stored in the hot water storage section 32. Shows the case. Switching valve 30 to 45 ° C. or higher 60 ° C. below the water flows, the valve body 301 is fully closed a second channel 14, is moved to the first flow path 12 side as water flows. The water that has flowed into the first flow path 12 is branched at the intermediate portion 121, a part flows toward the thermostat valve 34, and the remaining part flows toward the first branch flow path 20. The water that has flowed to the first branch flow path 20 flows into the hot water storage section 32 and pushes the water in the hot water storage section 32 to the second branch flow path 18. The water pushed out to the second branch flow path 18 flows into the second flow path 14 from the intermediate portion 141 and flows to the thermostat valve 34 side.

  In the thermostat valve 34, water of 45 ° C. or more and less than 60 ° C. flowing from the first flow path 12 side and water of less than 38 ° C. flowing from the second flow path 14 side are mixed to obtain 45 ° C. water as the flow path 16 side. To be sent to. In the case of this embodiment, the valve body 341 moves so that the water from the first flow path 12 side is approximately 73% and the water from the second flow path 14 side is approximately 27%. In the situation shown in FIG. 6, the hot water storage section 32 is filled with water at 45 ° C. or more and less than 60 ° C.

  Subsequently, in the situation shown in FIG. 7, the temperature of the water supplied from the water heater HW is further increased, water at 60 ° C. is supplied, and water at 45 ° C. or more and less than 60 ° C. is stored in the hot water storage section 32. Shows the case. The switching valve 30 into which 60 ° C. water flows moves so that the valve body 301 fully closes the second flow path 14 and water flows to the first flow path 12 side. The water that has flowed into the first flow path 12 side flows into the first branch flow path 20 side in the intermediate portion 121. The water that has flowed to the first branch flow path 20 flows into the hot water storage section 32 and pushes the water in the hot water storage section 32 to the second branch flow path 18. The water pushed out to the second branch flow path 18 flows into the second flow path 14 from the intermediate portion 141 and flows to the thermostat valve 34 side. The water that has flowed into the second flow path 14 side flows into the thermostat valve 34 side. In the thermostat valve 34, since water of 45 ° C. or higher flows, the valve body 341 moves so as to receive only water flowing from the second flow path 14 side.

10: channel 12: first channel 14: second channel 16: channel 18: second branch channel 20: first branch channel 30: switching valve 32: hot water storage unit 34: thermostat valve 101: branch unit 121 : Intermediate part 141: Intermediate part 161: Junction part 301: Valve body 341: Valve body FC: Water faucet HW: Water heater QW: Instant water system W 1: Water supply pipe W 2: Water supply pipe WT: Hot water storage part

Claims (2)

An instant hot water system disposed between a water heater and a faucet,
A first channel and a second channel provided independently of each other;
A third flow path connecting the way of the first flow path and the way of the second flow path;
A branch part that branches the flow path extending from the water heater side into the first flow path and the second flow path;
A merging portion that joins the first flow path and the second flow path to the flow path extending to the faucet;
A hot water storage section capable of storing water and having heat insulation,
The third flow path is formed so as to communicate the first flow path and the inside of the hot water storage section and to communicate the second flow path and the inside of the hot water storage section,
The flow path switching means provided in the branch section switches the flow path to the first flow path side when water having a temperature equal to or higher than the first temperature is supplied from the water heater side, while water having a temperature lower than the first temperature is When supplied, it is configured to switch the channel to the second channel side,
The temperature adjusting means provided in the junction is
Adjusting the amount of water supplied from the first channel and the amount of water supplied from the second channel so that the water supplied to the channel extending to the faucet approaches the second temperature,
When the water to be mixed in the junction is less than the second temperature, the amount of water supplied from the first channel is increased and the amount of water supplied from the second channel is decreased, and the water is mixed in the junction. When the amount of water to be supplied is higher than the second temperature, the amount of water supplied from the first channel is reduced and the amount of water supplied from the second channel is increased. Hot water system.   The instant hot water system according to claim 1, wherein the second temperature is set to be higher than the first temperature.

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