JP2007255753A - Hot water supply system and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply system, safely and efficiently supplying emergency water when a disaster occurs. <P>SOLUTION: In this hot water supply system using a hot water storage type water heating apparatus, when the occurrence of a disaster such as an earthquake or a fire is detected by a disaster detecting means 6, hot water in the hot water storage tank 5 is controlled to be low-temperature and uniform by an in-tank hot water temperature control means 7. Thus, even when cut-off of water or power failure is caused after the disaster occurs, water for living can be supplied with ease of use and safely. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hot water supply system using a hot water storage hot water heater that can supply hot water as emergency water when a disaster occurs.

  When disasters such as earthquakes occur, water outages often occur along with power outages, and in particular when water outages occur, securing water for use in toilets and washrooms becomes a major problem. As a technique for securing water for daily use in the event of such a disaster, a bathtub water storage system that automatically fills a bathtub with water or hot water when an earthquake occurrence is detected is disclosed (Patent Document 1).

  On the other hand, in a hot water supply system using a hot water storage water heater represented by an electric heat pump, hot water is boiled in a hot water storage tank provided, and the hot water in the hot water storage tank is supplied with tap water supplied from a water supply pipe. It is mixed by a mixing valve, temperature-controlled at a set temperature, and supplied to a user through a hot water supply pipe.

In such a water heater, it is common to store hot water having the highest temperature that can be discharged in a hot water storage tank. In a heat pump water heater, high-temperature heated hot water exceeding 90 ° C. can be supplied depending on the refrigerant. A technology related to a hot water storage type hot water heater (water heater) for using hot water stored in such a hot water storage tank as domestic water in the event of a disaster is also disclosed (Patent Document 2).
JP 2006-22970 A Japanese Patent Laid-Open No. 10-103781

  However, in the water storage system as in the above-mentioned Patent Document 1, water or hot water is put in the bathtub every time an earthquake occurs, and when water is not actually stopped, water is only consumed wastefully. In addition, even when a water outage occurs, all water for daily life must be taken out of the bathtub, which is inconvenient.

  In this regard, as in Patent Document 2, it is useful to use hot water stored in a hot water storage tank in a hot water supply system as domestic water, but in a conventional hot water storage water heater such as Patent Document 2, The hot water in the hot water storage tank is drained as it is from the drain tap at the bottom, so if all the hot water in the tank is set to a high temperature, the hot water in the tank is kept at the highest temperature that can be discharged. In this case, hot water of 65 to 90 ° C. is drained directly.

  When water breaks off due to an earthquake, water for diluting hot water cannot be obtained, so even if hot water is obtained at this temperature, a situation occurs where it is too hot to be used after all.

  When considered as emergency water, what is needed is not hot water, but water or hot water around 40 ° C. that can be directly bathed or showered is desirable in cold winters.

Moreover, since patent document 2 is an electric water heater (heating with a heater), compared with a heat pump water heater, since it becomes uniform temperature in the whole hot water in a hot water storage tank, 65-90 degreeC hot water may be drained. . On the other hand, in a water heater using a stacked boiling type hot water storage tank found in a heat pump water heater, as described later, a high temperature layer and a low temperature layer can be formed in the hot water storage tank, for example, by stirring this, The temperature can be adjusted.

  In order to solve the above-described conventional problems, a hot water supply system of the present invention is a hot water supply system using a hot water storage type hot water heater, and detects the occurrence of a disaster in the tank hot water temperature control means for controlling the hot water temperature in the hot water storage tank. A disaster detection means, and when the occurrence of a disaster is detected by the disaster detection means, the hot water temperature control means in the tank sets the boiling temperature of the hot water storage tank to a low temperature and performs boiling. .

  When the occurrence of a disaster such as an earthquake is detected, the hot water supply system of the present invention keeps the hot water in the hot water storage tank at a low temperature in preparation for a water outage or a power outage. Even in the case of occurrence of water, it is possible to provide water for daily use that is easy to use as an emergency while avoiding dangerous conditions such as burns caused by hot water.

  Also, for example, when a mild earthquake is detected, the hot water that is heated excessively is stopped while normal hot water is supplied, so a larger earthquake, which is the main shock, occurs following a mild earthquake. In such a case, it is possible to avoid dangers such as leakage of hot water due to collapse of the hot water storage tank and burns during supply.

  A first aspect of the present invention is a hot water supply system using a hot water storage type water heater, comprising: a tank hot water temperature control means for controlling the hot water temperature in the hot water storage tank; and a disaster detection means for detecting the occurrence of a disaster, the disaster detection means. When an occurrence of an earthquake is detected in the tank, the hot water temperature control means in the tank performs boiling by setting the boiling temperature of the hot water storage tank to a low temperature.

  This makes it possible to provide water for daily use that is easy to use as an emergency while avoiding dangerous situations such as burns caused by hot water even when water breaks off due to the occurrence of an earthquake.

  Also, for example, when a mild earthquake is detected, the hot water that is heated excessively is stopped while normal hot water is supplied, so a larger earthquake, which is the main shock, occurs following a mild earthquake. In such a case, it is possible to avoid dangers such as leakage of hot water due to collapse of the hot water storage tank and burns during supply.

  According to a second invention, in the first invention, when the occurrence of an earthquake is detected by the disaster detection means, the boiling temperature of the hot water storage tank heated by the hot water temperature control means in the tank is set outside the water heater. It changes depending on the temperature.

  As a result, when boiling cannot be performed due to a power failure or disconnection at the time of the earthquake, the hot water stored in the hot water is being cooled. For example, when the outside air temperature is low as in winter, it is 45-50. By setting the hot water storage temperature according to the outside temperature, such as hot water of about ℃, or storing warm water of about 38 to 42 ℃ when the outside temperature is high like summer, it provides easier-to-use domestic water I can do it.

  A third invention comprises a disaster detection means for detecting the occurrence of an earthquake in a hot water supply system using a hot water storage type hot water heater, and a hot water supply control means at the time of disaster occurrence that enables hot water to be supplied to the user when a disaster occurs. When the occurrence of an earthquake is detected by the disaster detection means, the hot water supply control means at the time of occurrence of a disaster supplies hot water only with hot water held in the hot water storage tank.

  This makes it possible to continue to use hot water supply functions such as showering and bathing even in the event of a water outage when an earthquake occurs.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, when the occurrence of an earthquake is detected by the disaster detection means, the hot water supply at the time of the disaster is provided. Hot water is supplied at a low temperature only with hot water held in the hot water storage tank by the control means.

  This makes it possible to continue using hot water supply functions such as showering and bathing even when water breaks off in the event of an earthquake, and avoids dangerous conditions such as burns caused by hot water. The hot water supply is possible.

  5th invention is equipped with the stirring means which stirs the hot water in a hot water storage tank in 1st-4th invention, The said hot water supply control means at the time of a disaster occurrence detects the occurrence of an earthquake in the said disaster detection means The temperature in the hot water storage tank is controlled by the stirring means.

  Accordingly, hot water or water at a temperature suitable for an emergency can be supplied by forcibly mixing hot water in the high temperature layer and water in the low temperature layer.

  A sixth invention is the invention according to any one of the first to fifth aspects, wherein the occurrence of an earthquake is detected by the disaster detection means, and the hot water temperature in the hot water storage tank is controlled to a low temperature by the hot water temperature control means in the tank. Alternatively, after hot water is supplied by the hot water supply control means at the time of disaster occurrence, if the occurrence of an earthquake is not detected again within a predetermined period, the normal operation state is restored and normal temperature control or hot water supply control in the hot water storage tank is performed. Is what you do.

  As a result, if a large-scale earthquake does not occur after detecting a small-scale earthquake, the temperature control in the hot water storage tank automatically returns to the boiling-up control in the normal state, and hot water is efficiently added. Can be boiled up. Similarly, even when hot water is supplied by the hot water supply means at the time of disaster occurrence, it returns to the normal hot water supply control, so that hot water can be supplied efficiently.

  The seventh invention is a program for causing a computer to execute at least one of the hot water supply systems of the first to sixth inventions. According to this configuration, since it is a program, a part or all of the hot water supply system of the present invention can be easily realized using a microcomputer or the like. In addition, it is possible to facilitate the distribution of the program by recording the program on a recording medium or distributing the program using a communication line.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
In the present embodiment, the present invention will be described by taking as an example a hot water supply system using a heat pump water heater as a hot water storage type hot water heater.

  In FIG. 1, the whole block diagram of the hot-water supply system in embodiment of this invention is shown. In this embodiment, an earthquake will be taken as an example of a disaster and the system will be described. Although the occurrence of fire or water shortage may be detected as a disaster, the feature of the present invention that the water heater is controlled by switching between the “disaster occurrence mode” and the “normal mode” is a stage such as pre-quake-main shock It is most effective in disasters called “earthquakes” that require mode switching.

In this hot water supply system, a heat pump water heater (hereinafter referred to as a “hot water heater”) 1, which is a hot water heater, is connected to a seismic device (or operation remote controller) 2, and an earthquake is detected by the disaster detection means 6 </ b> A of the seismic device 2. In addition, the hot water supply system notifies the hot water heater 1 of the occurrence of an earthquake. The water heater 1 and the seismic sensor 2 communicate by wire or wirelessly.

  In addition, the seismic sensor 2 can communicate with the server 100 via a network, and together with the occurrence of an earthquake, the detected earthquake information (earthquake occurrence time, seismic intensity, etc.) and hot water storage obtained by communicating with the water heater 1 Information (such as the temperature and amount of water stored in the hot water storage tank, the user's operation history (whether or not it has been operated by the user after the earthquake), etc.) can be transmitted to the server 100.

  From this information, the server 100 can grasp the damage status and hot water storage status of each home and region. In the present embodiment, information is exchanged with a server, but the present invention is a hot water supply system that can be established without a server, and the present invention is not limited by the presence or absence of a server.

  The seismic sensor 2 is a seismic intensity sensor used in a gas microcomputer meter or the like, and is incorporated in an operation remote controller such as a bathroom remote controller or a kitchen remote controller in a normal hot water supply system or an information terminal for a home control system. Alternatively, display means 3A may be provided to display earthquake information and hot water storage information.

  Of course, the same operation as the seismic device 2 can be realized by using the disaster detection means 6B and the internal display means 3B provided in the water heater 1. With such a configuration, the present invention can be implemented regardless of the presence or absence of the seismoscope / operation remote controller 2.

  If it is displayed on the display means 3B, even if it is not possible to enter the home in the event of a disaster such as a fire or earthquake (when the display of the operation remote control installed indoors cannot be confirmed), the hot water supply installed outdoors You can directly check how much hot water is stored in the machine.

  The water heater 1 is connected with hot water supply means 4 such as a shower, a faucet, and a hot water outlet of a bath, and hot water in the hot water storage tank 5 is supplied by operating the hot water supply means 4 or the operation remote controller 2.

  When the water heater 1 detects the occurrence of an earthquake with the disaster detection means 6B, the operation is started in the “earthquake occurrence mode”.

  The water heater 1 that has started operation in the “earthquake generation mode” adjusts the hot water temperature in the hot water storage tank 5 to an appropriate value by the hot water temperature control means 7 in the tank. At this time, the boiling of the hot water storage tank 5 may be stopped and the hot water in the hot water storage tank 5 may wait to cool, but it is set at a low temperature (for example, 35 to 40 ° C.) suitable for human use. You can raise it.

  FIG. 2 shows an internal configuration diagram of the heat pump water heater 1. The thick line in the figure is a water pipe and shows the flow of water.

  The water heater 1 includes a heat pump unit that houses a refrigerant circulation circuit 15 including a compressor 11, a heat exchanger 12, a decompression means 13, and a heat absorber 14, a hot water storage tank 17 that stores hot water heated by the heat exchanger 12, and related Consists of a hot water storage tank unit that stores piping.

  The refrigerant circulation circuit 15 constitutes a heat pump cycle, and encloses a refrigerant whose high-pressure side refrigerant pressure is equal to or higher than a critical pressure, such as carbon dioxide. The heat absorber 14 is constituted by a refrigerant / air heat exchanger having a fan.

The hot water heated to a high temperature by exchanging heat with the refrigerant flowing through the heat exchanger 12 is conveyed from the hot water storage pipe 17 to the hot water storage tank 5 by the stacking pump. The hot water storage pipe 17 is connected to the top of the hot water storage tank 5, and the hot water storage tank 5 is a stacked hot water storage tank in which hot hot water is stored from above.

  During normal operation (when operating in the “normal mode”), water is supplied through the water supply pipe 10 connected to the bottom of the hot water storage tank 5, and is discharged from the upper hot water discharge pipe 18A by the pressure. And it mixes with the water obtained from the water supply pipe | tube 10 with the mixing valve 19, and warm water with a predetermined | prescribed flow volume and temperature is supplied from a hot-water supply port. As described above, it is assumed that the hot water storage tank 5 is operated at full water in normal times.

  In the present embodiment, 11 to 17 for controlling the state of hot water in the hot water storage tank 5 are treated as the hot water temperature control means 7 in the tank. Among these, 16 to 17 having a mechanism for circulating water (or hot water) in the tank is handled as the stirring means 9.

  Here, the tank hot water temperature control means 7 has the stirring means 9, but the stirring means may be implemented by a mechanism different from the tank hot water temperature control means (for example, an agitator in the hot water storage tank). I do not care.

  A safety valve 20 is attached to the top of the hot water storage tank 5, and when the pressure in the hot water storage tank 5 becomes abnormal (super pressurized state), the valve is opened to lower the pressure.

  In the “earthquake occurrence mode”, the safety valve 20 is released by the hot water supply control means 8 at the time of disaster occurrence, air is taken in from the safety valve 20, and discharged from the hot water discharge pipe 18 </ b> B below the hot water storage tank 5. When water is not obtained from the water supply pipe 10, the hot water discharged from the hot water discharge pipe 18B becomes hot water supplied from the hot water supply port as it is.

  Thus, hot water (or water) is supplied from the hot water supply means 4 using the hot water supply control means 8 when a disaster occurs during the “earthquake occurrence mode” operation. At this time, by displaying the remaining hot water amount in the hot water storage tank on the internal or external display means 3, it is possible to inform how many hot water can be used. This remaining hot water amount may be transmitted to the server 100 to collectively manage how much hot water (or water) is stored in which tank.

  FIG. 3 illustrates the operation of the present system based on the control flow in the hot water heater 1.

  Here, the “earthquake occurrence mode” handled in the present embodiment will be described. “Earthquake occurrence mode” is intended to solve the following problems, assuming that “power outage” or “water outage” occurs after an earthquake occurs.

(Problem 1) If the power outage caused by an earthquake remains in the "normal mode", hot water may be stored in the hot water storage tank, and the hot water temperature in the tank cannot be adjusted due to a power outage. It is dangerous to use as it is as daily life water in an emergency, and it is not easy to use.

(Problem 2) If the water is shut off due to an earthquake and remains in “normal mode”, hot water may be stored in the hot water storage tank, and hot water cannot be diluted by water outage. It is dangerous to use as it is as daily life water in an emergency, and it is not easy to use.

  Based on the above, “Earthquake occurrence mode” controls the hot water in the hot water storage tank to a non-hazardous temperature when an earthquake is detected, and stores hot water as an emergency water whenever a power outage or water outage occurs. In this mode, the water heater is controlled so that hot water or water in the tank can be used.

  Therefore, even if an earthquake occurs, there is no need to stop the refrigerant circulation circuit 15 to stop boiling, or close the mixing valve 19 to stop water supply.

  Furthermore, according to the seismic intensity detected by the seismic sensor 2, “Continue to operate in“ Earthquake occurrence mode ”to detect occurrence of pre-shock if seismic intensity is less than 5”, “Emergency stop mode” to detect occurrence of mainshock if seismic intensity is 5 or more The mode may be further divided and controlled, for example, “Stop boiling at”.

  From these things, in FIG. 3, in order to "store a low temperature hot water in the hot water storage tank 5 when an earthquake is detected", the method of "boiling", "supplying water", and "stirring" is taken.

  The water heater 1 detects an earthquake with the disaster information acquisition means 6B (S0), and switches to the “earthquake occurrence mode” if the earthquake has a seismic intensity of 4 or less (S2).

  If the earthquake has a seismic intensity of 5 or more, “emergency stop mode” is set (S3), the refrigerant circulation circuit 15 is stopped to stop boiling, and the water temperature in the tank is made uniform by the stirring means 9 (S14). The safety valve 20 is opened and hot water is supplied by the hot water supply control means 8 when a disaster occurs (S15).

  Subsequent to S2, the tank internal hot water temperature control means 7 measures the total energy amount in the tank (calculates the total energy amount (heat amount) in the tank from the amount of hot water stored in the tank and the hot water temperature of each layer) (S4). ), It is determined whether or not boiling is necessary (S5). Although not shown, a temperature sensor for measuring the hot water temperature in the hot water storage tank is provided. For example, a plurality of temperature sensors are provided to measure the temperatures of the high temperature layer and the low temperature layer in the hot water storage tank.

  If the total amount of energy measured in S3 is lower than the amount of energy when the inside of the tank is made uniform at the set temperature, boiling-up control is performed, and the entire amount in the tank is set to a uniform set temperature (S6).

  If the total amount of energy is high, water is drawn from the water supply pipe 10 and circulated to lower the amount of energy and make the temperature in the tank uniform (S7).

  If the total energy amount is substantially equal, the hot water in the hot water storage tank is stirred by operating only the laminating pump 16 in the stirring means 9 and feeding the low temperature water into the hot water storage pipe 17 to match the set temperature. (S8). And these control contents are alert | reported by the display means 3 (S9-11).

  Here, the process is divided by measuring the total amount of energy and comparing the result with the set temperature. However, if a power failure occurs, “boiling” cannot be performed and water breakage occurs. In some cases, water supply cannot be performed, so it is possible to agitate the hot water in the tank by the agitation means 9 assuming that a power outage has occurred or that a water outage has occurred when an earthquake is detected. .

  Moreover, you may switch the means of S6-S8 (including re-switching) by the power failure detection after a earthquake detection, and water stop detection. At this time, the set temperature and the temperature in the tank may not necessarily coincide with each other depending on the stacking state of hot water in the tank and the occurrence of power failure / water supply.

In addition, the set temperature here is a temperature at which a person touches the hot water supplied from the hot water outlet, and a low temperature (35 to 42 ° C.) is used as a guideline as a temperature that can be directly used for a bath or shower. The temperature may be uniquely determined as “35 to 42 ° C.”, a plurality of temperature centers are arranged outside the hot water storage tank and the outside air temperature is measured, and “when the outside air temperature is low (for example, 15 degrees or less)” The tank hot water temperature control means 7 makes adjustments such as “hot water of about 45 to 50 ° C.” and “warm hot water of about 35 to 40 ° C. when the outside air temperature is high (for example, 15 ° C. or higher)”. You can go.

  Also, it can be set according to the application. If you do not use it in a bath and want lukewarm water, you can set it to 25-35 ° C. It doesn't matter. This temperature may be set in advance by the user before the occurrence of an earthquake such as during installation using the setting means of the operation remote controller 2, for example.

  Further, a calendar means (not shown) may be provided in any of the hot water storage type hot water heater 1, the operation remote controller 2, and the server 100, and the hot water supply set temperature in the hot water storage tank may be switched according to the season instead of the outside air temperature.

  When the hot water temperature in the hot water storage tank has been set to the set temperature, the hot water supply control means 8 switches the hot water supply means from what has been mixed with water by the normal mixing valve 19 to the hot water supply by releasing the safety valve 20. (S12). This timing may be performed when the “earthquake occurrence mode” is entered, or power failure detection means such as a voltage sensor that detects a voltage drop or a flow rate sensor that detects a flow rate drop in a water supply pipe, or a water failure detection means. It may be performed when a power failure or water outage is detected.

  In case of shifting to “Earthquake occurrence mode”, the release timer for a predetermined period is activated in preparation for the mainshock. If an earthquake that appears to be a mainshock is not detected after a predetermined period (for example, 3 days), the process returns to the “normal mode” and switches to normal temperature control in the hot water storage tank such as efficient laminated boiling control (S13). .

  This cancellation timer may also be set as “a predetermined period until an earthquake with a seismic intensity of 5 or more occurs” or “when an earthquake with a seismic intensity of 3 or more falls within 3 times within the period” Alternatively, the setting method may be “if an earthquake with a seismic intensity of 3 or more does not occur within a day”. The “earthquake generation mode” is continued until the condition is satisfied.

  The present invention is intended for a hot water storage type water heater, and the heating means may be an electric water heater that heats water in a tank with an electric heater or the like, or other heating means. It doesn't matter.

  As described above, in the present embodiment, the hot water supply system of the present invention detects the occurrence of a disaster such as an earthquake and lowers the hot water in the hot water storage tank assuming a situation where a power failure or water outage occurs. is there. As a result, even when a disaster such as an earthquake occurs, the hot water in the hot water storage tank will not be heated to a high temperature, wasteful energy will not be wasted, and water will be supplied from the hot water outlet as an emergency water supply. Even when it is performed, it is possible to avoid a dangerous state such as a burn caused by hot water.

  Although not shown in the figure, when transitioning to “Earthquake occurrence mode” or “Emergency stop mode”, the hot water temperature and the remaining hot water amount in the hot water storage tank are displayed on the display means of the water heater or the external display means of the operation remote controller. It is also possible to notify the administrator or notify the administrator by transmitting it to the server.

  Here, the server is, for example, a government office or a fire department, and it is possible to grasp where the water (or hot water) remains in the hot water storage tank of the house. Furthermore, it is conceivable to remotely control the hot water supply control means 8 at the time of disaster occurrence from the server to permit permission to open the safety valve and take water. Thereby, emergency water can be used effectively.

In the above embodiment, the seismic intensity information is acquired from the seismic sensor 2, but as a method for acquiring the earthquake information from the server by a network, a wired communication network such as the Internet, a wireless communication network such as a mobile phone, It is conceivable to use a broadcasting network such as television or radio.

  Further, for simplicity of explanation, the server has been described as one, but information may be acquired separately from a plurality of servers.

  In addition, when a program for causing a computer to execute at least one means in the present system is used, a part or all of the system of the present invention can be easily realized using a microcomputer or a personal computer. Also, the program can be easily distributed by recording on a recording medium or using a communication line.

  As described above, the present invention detects disasters such as fires and earthquakes by means of disaster detection means, and efficiently and safely supplies hot water in the event of a disaster. The amount of hot water stored can be ascertained. For this reason, it is possible to construct a large-scale disaster water storage information management system that minimizes damage and manages water storage information for the entire region even when a large-scale fire or earthquake disaster occurs.

The whole block diagram of the hot-water supply system in this embodiment The internal block diagram of the hot water storage type water heater 1 in embodiment of this invention Control flow diagram in hot water storage type hot water heater 1 in the embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage type water heater 4 Hot water supply means 5 Hot water storage tank 6 Disaster detection means 7 Tank hot water temperature control means 8 Disaster hot water control means 9 Stirring means

Claims (7)

In a hot water supply system using a hot water heater, a hot water temperature control means in the tank for controlling the hot water temperature in the hot water storage tank and a disaster detection means for detecting the occurrence of a disaster are provided, and the occurrence of an earthquake is detected by the disaster detection means. If detected, the hot water temperature control means in the tank sets the boiling temperature of the hot water storage tank to a low temperature and performs boiling. The hot water supply according to claim 1, wherein when the occurrence of a disaster is detected by the disaster detection means, the boiling temperature of the hot water storage tank heated by the hot water temperature control means in the tank is changed according to the outside air temperature of the hot water heater. system. In a hot water supply system using a hot water storage type hot water heater, it comprises a disaster detection means for detecting the occurrence of a disaster, and a hot water control means for a disaster when hot water can be supplied to a user when a disaster occurs. A hot water supply system in which when the occurrence of an earthquake is detected, the hot water supply control means at the time of disaster occurrence supplies hot water only with hot water held in the hot water storage tank. A hot water supply control means at the time of disaster occurrence that enables hot water to be supplied to the user when a disaster occurs, and when the occurrence of an earthquake is detected by the disaster detection means, the hot water supply control means at the time of disaster occurrence is stored in the hot water storage tank The hot water supply system according to claim 1, wherein hot water is supplied at a low temperature using only hot water held in the water. A stirring means for stirring the hot water in the hot water storage tank is provided, and the hot water supply control means at the time of disaster occurrence controls temperature in the hot water storage tank by the stirring means when the occurrence of an earthquake is detected by the disaster detection means. The hot water supply system according to 3 or 4. After the occurrence of an earthquake is detected by the disaster detection means and the hot water temperature in the hot water storage tank is controlled to be low by the hot water temperature control means in the tank, or after hot water is supplied by the hot water supply control means at the time of disaster occurrence, The hot water supply system according to any one of claims 1 to 5, wherein if the occurrence of an earthquake is not detected again within the period, the normal operation is resumed and temperature control or hot water supply control in a normal hot water storage tank is performed. A program for causing a computer to execute at least one of the hot water supply systems according to claim 1.