Hot water supply system, method for controlling hot water supply system, terminal device, method for controlling terminal device, and computer program

Abstract

To provide a hot water supply system improved in usability thereof: to provide a method for controlling the hot water supply system: to provide a terminal device: to provide a method for controlling the terminal device: and to provide a computer program.SOLUTION: A hot water supply system includes: at least one hot water supply device having at least one function of boiling hot water for supplying hot water; a terminal device related to the hot water supply device; and a server managing the hot water supply device. The server acquires contract information related to the electric power contract applied to the hot water supply device, and determines the function of the hot water supply device restricted by the electric power contract on the basis of the acquired contract information. And the server displays a first notification related to the restricted function and the electric power contract as a restriction reason on the terminal device.SELECTED DRAWING: Figure 2

Description

Technical Field

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[0001] The present disclosure relates to a hot water supply system, a method for controlling a hot water supply system, a terminal device, a method for controlling a terminal device, and a computer program.

Background Art

[0002] Conventionally, there is a hot water supply system having a storage type water heater. The storage type water heater has a function of "boiling up" hot water before the user uses the hot water, that is, boiling up the hot water and storing it in a hot water storage tank. Using this function, various extended functions have been developed. For example, when the hot water supply system of Patent Document 1 acquires warning information from a weather server, it has a function of storing the hot water in the hot water storage tank in preparation for the occurrence of water cut or power failure. In addition, a function of boiling up hot water at midnight using relatively cheap night-time electricity and storing it in a hot water storage tank has also been developed.

Prior Art Documents

Patent Documents

[0003] <于 <于

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] <于 However, the use of the extended functions using the above-mentioned boiling up may sometimes be limited. Therefore, there is a risk that the usability of the hot water supply system may decrease. <于 <于

[0005] <于 An object of the present disclosure is to provide a hot water supply system, a method for controlling a hot water supply system, a computer program, and a storage medium that improve the usability of the hot water supply system. <于

Means for Solving the Problems

[0006] <于 To solve the aforementioned problems, this disclosure provides a hot water supply system, a method for controlling the hot water supply system, a terminal device, a method for controlling the terminal device, and a computer program.

[0007] One embodiment of a hot water supply system relating to this disclosure includes at least one water heater having at least one function of heating water for hot water supply, a terminal device associated with the water heater, and a server that manages the water heater. The server acquires contract information relating to the electricity contract applied to the water heater and determines the functions of the water heater that are restricted by the electricity contract based on the acquired contract information. The server then causes the terminal device to display a first notice relating to the restricted functions and the electricity contract that is the reason for the restriction.

[0008] Furthermore, a method for controlling a hot water supply system in another aspect relating to this disclosure controls a hot water supply system comprising at least one water heater, a terminal device associated with the water heater, and a server that manages the water heater. The water heater has at least one function of heating water for hot water supply. The method includes the steps of: the server obtaining contract information relating to the electricity contract applied to the water heater; the server determining, based on the obtained contract information, the functions of the water heater restricted by the electricity contract; and the server causing the terminal device to display a first notice relating to the restricted functions and the electricity contract that gives rise to the restriction.

[0009] Furthermore, other embodiments of the terminal device relating to this disclosure are associated with at least one water heater having at least one function of heating water for hot water supply. The terminal device includes a terminal display unit, a terminal communication unit capable of communicating with a server for managing the water heater, and a terminal control unit that manages the terminal display unit and the terminal communication unit. The terminal control unit starts a management program for managing the water heater and receives contract information related to the electricity contract applied to the water heater via the terminal communication unit. Based on the received contract information, the terminal control unit obtains the functions of the water heater that are restricted by the electricity contract. The terminal control unit then causes the management program to display a first notice via the terminal display unit relating to the restricted functions and the electricity contract that is the reason for the restriction.

[0010] Furthermore, a method for controlling a terminal device in another aspect of the present disclosure controls a terminal device associated with at least one water heater. The water heater has at least one function of heating water for hot water supply. The method for controlling the terminal device includes the steps of: starting a management program for managing the water heater; receiving contract information relating to the electricity contract applied to the water heater from a server for managing the water heater; obtaining the functions of the water heater restricted by the electricity contract based on the received contract information; and causing the management program to display a first notice relating to the restricted functions and the electricity contract.

[0011] Furthermore, another embodiment of the computer program relating to this disclosure is a computer program that causes the server of the hot water supply system to execute the method for controlling the hot water supply system described above. Alternatively, the computer program is a computer program that causes a terminal device associated with at least one hot water supply unit to execute the method for controlling the terminal device described above. [Effects of the Invention]

[0012] In this disclosure, the usability of the hot water supply system can be improved by a hot water supply system, a method for controlling the hot water supply system, a terminal device, a method for controlling the terminal device, and a computer program.

Brief Description of the Drawings

[0013] [Figure 1] Block diagram showing the configuration of the hot water supply system according to Embodiment 1 [Figure 2] Flowchart of an example of a method for controlling the hot water supply system in Embodiment 1 [Figure 3A] Example of a function list table of the water heater in Embodiment 1 [Figure 3B] Another example of the function list table of the water heater in Embodiment 1 [Figure 4] Example of the first notification in Embodiment 1 [Figure 5] Flowchart of an example of a method for controlling the terminal device in Embodiment 1 [Figure 6] Flowchart of an example of a method for controlling the hot water supply system in Embodiment 2 [Figure 7] Example of the second notification in Embodiment 2 [Figure 8] Flowchart of an example of a method for controlling the hot water supply system in Embodiment 3 [Figure 9] Example of the third notification in Embodiment 3 [Figure 10] Another example of the third notification in Embodiment 3 [Figure 11] Block diagram showing the configuration of the hot water supply system according to Embodiment 3 [Figure 12] Flowchart of an example of a method for controlling the hot water supply system in Embodiment 4

Modes for Carrying Out the Invention

[0014] (Background Leading to the Present Disclosure) As described above, there are times when the use of the extended function using boiling is restricted. For example, in the case of a condominium building or the like that has entered into a high-voltage bulk power reception power contract for collectively receiving high-voltage power in order to step down high-voltage power and distribute it to multiple users, the use of the function during a specific time period may be restricted for overall load leveling.

[0015] In addition, when the power contract applied to the hot water supply system is changed, specific functions may be restricted or unrestricted depending on the rate setting or the like of the power contract. In the conventional hot water supply system, when a function is restricted, the user is not notified and the system automatically does not activate the function. The user only notices the restriction when trying to use the function, but does not know why the function cannot be used.

[0016] As described above, in the conventional hot water supply system, the restriction or unrestriction of functions is performed without any notification to the user, and the user cannot know why the function is restricted. Therefore, the conventional hot water supply system has low usability for the user.

[0017] Therefore, in order to improve the usability of the hot water supply system, the inventors have considered notifying the user of the restriction or unrestriction of functions together with the reason, and have arrived at the present disclosure.

[0018] First, various aspects of a hot water supply system, a method for controlling the hot water supply system, a terminal device, a method for controlling the terminal device, and a computer program will be described.

[0019] The hot water supply system according to the first aspect of the present disclosure includes at least one hot water heater having at least one function of boiling water for hot water supply, a terminal device associated with the hot water heater, and a server that manages the hot water heater. The server acquires contract information related to the power contract applied to the hot water heater, and determines the functions of the hot water heater restricted by the power contract based on the acquired contract information. Then, the server causes the terminal device to display a first notification related to the restricted function and the power contract that is the reason for the restriction.

[0020] According to such a configuration, the server notifies the user of information related to the restricted function and the power contract that is the reason for the restriction via the terminal device. Therefore, the usability of the hot water supply system can be improved.

[0021] In the second embodiment of the hot water supply system relating to the present disclosure, the server may further cause the terminal device to display a first notification before receiving a command from the terminal device to perform a restricted function.

[0022] With this configuration, users are notified in advance of any restrictions before they actually use the restricted functions. Therefore, the usability of the hot water system can be further improved.

[0023] In the third embodiment of the hot water supply system relating to the present disclosure, in the first or second embodiment, the server may further cause the terminal device to display a second notice if it receives a contract change notice indicating that the electricity contract applicable to the hot water supply has been changed. The second notice may include information relating to the changed electricity contract.

[0024] This configuration allows for further improvement in the usability of the hot water supply system by notifying users of changes in their electricity contracts.

[0025] In the fourth aspect of the hot water supply system relating to this disclosure, in the third aspect, the second notice may further include information relating to functions that are unrestricted or restricted as a result of the changed electricity contract.

[0026] This configuration allows for further improvement in the usability of the hot water supply system by notifying users of the impact of changes in their electricity contracts.

[0027] The fifth embodiment of the hot water supply system relating to this disclosure may, in any one of the first to fourth embodiments, have a power contract that is a bulk high-voltage power receiving contract for receiving high-voltage power in bulk in order to transform the high-voltage power and distribute it to multiple users.

[0028] This configuration further improves the usability of the hot water supply system when a high-voltage bulk power supply contract is applied to the hot water supply system.

[0029] The hot water supply system of the sixth aspect relating to this disclosure may, in any one of the first to fourth aspects, have a power contract that is a time-of-use power contract in which different electricity rates are set for multiple time periods.

[0030] This configuration allows for further improvement in the usability of hot water supply systems that are subject to time-of-use electricity contracts.

[0031] In the seventh embodiment of the hot water supply system relating to this disclosure, the restricted function in any one of the first to sixth embodiments may be a function of heating and storing hot water during a specific time period.

[0032] This configuration further improves the usability of a hot water supply system that has the function of heating and storing hot water during specific time periods.

[0033] In any one of the first to seventh embodiments of the hot water supply system relating to the eighth aspect of this disclosure, the server may further perform the following: namely, the server determines at least one recommended time period based on the electricity contract. The server compares the current time period with the recommended time period before performing a function to immediately heat water or a function to heat and store water for a specific time period. If the current time period is not included in the recommended time period, the server may cause the terminal device to display a third notification indicating information related to the recommended time period. Electricity rates for the recommended time period may be set lower than electricity rates for other time periods.

[0034] With this configuration, it is possible to offer proposals that reduce electricity costs for specific functions of the water heater, depending on the electricity contract. By offering proposals that can save on electricity costs, the usability of the water heating system can be further improved.

[0035] The hot water supply system of the ninth aspect of the disclosure may include multiple water heaters in any one of the first to seventh aspects. The server may further do the following: The server determines at least one recommended time period based on the electricity contract. Before performing the function of immediately heating water or the function of heating and storing water at a specific time period, the server designates at least a portion of the recommended time period as a specified time period for each water heater. The server may instruct each water heater to heat water at the specified time period. Electricity rates for the recommended time period may be set lower than electricity rates for other time periods. The specified time periods for at least two water heaters may be different time periods.

[0036] With this configuration, the electricity charges incurred by performing a specific function of the hot water supply system can be reduced based on the electricity contract. Therefore, the usability of the hot water supply system can be further improved.

[0037] A method for controlling a hot water supply system according to a tenth aspect of the present disclosure controls a hot water supply system comprising at least one water heater, a terminal device associated with the water heater, and a server for managing the water heater. The water heater has at least one function of heating water for hot water supply. The method includes the steps of: the server obtaining contract information relating to an electricity contract applied to the water heater; the server determining, based on the obtained contract information, functions of the water heater restricted by the electricity contract; and the server causing the terminal device to display a first notice relating to the restricted functions and the electricity contract that gives rise to the restriction.

[0038] Such control can improve the usability of the hot water system by informing the user of information related to the limited functions and the electricity contract that causes the limitations.

[0039] A terminal device according to the eleventh aspect of the present disclosure is associated with at least one water heater having at least one function of heating water for hot water supply. The terminal device includes a terminal display unit, a terminal communication unit capable of communicating with a server for managing the water heater, and a terminal control unit that manages the terminal display unit and the terminal communication unit. The terminal control unit starts a management program for managing the water heater and receives contract information related to the electricity contract applied to the water heater via the terminal communication unit. Based on the received contract information, the terminal control unit obtains the functions of the water heater that are restricted by the electricity contract. The terminal control unit then causes the management program to display a first notice via the terminal display unit relating to the restricted functions and the electricity contract that is the reason for the restriction.

[0040] With this configuration, the terminal device notifies the user of information related to the limited functions and the electricity contract that causes the limitations. Therefore, the usability of the hot water supply system can be improved.

[0041] In the twelfth aspect of the present disclosure, the terminal device, in the eleventh aspect, may further cause the terminal control unit to display a first notice to the management program before receiving a command from the management program to perform a restricted function.

[0042] With this configuration, users are notified in advance of any restrictions before they actually use the restricted functions. Therefore, the usability of the hot water system can be further improved.

[0043] In the terminal device of the 13th aspect of the present disclosure, in the 11th or 12th aspect, the terminal control unit may further cause the management program to display a second notification when it receives a contract change notification from the server indicating that the electricity contract applicable to the water heater has been changed. The second notification may include information relating to the changed electricity contract.

[0044] This configuration allows for further improvement in the usability of the hot water supply system by notifying users of changes in their electricity contracts.

[0045] In the 14th aspect of the present disclosure, the terminal device, in the 13th aspect, may further include information relating to functions that are unrestricted or restricted as a result of the changed electricity contract.

[0046] This configuration allows for further improvement in the usability of the hot water supply system by notifying users of the impact of changes in their electricity contracts.

[0047] In any one of the 11th to 14th embodiments of the present disclosure, the terminal device may be a high-voltage bulk power receiving power contract in which high-voltage power is received in bulk in order to transform the high-voltage power and distribute it to multiple users.

[0048] This configuration further improves the usability of the hot water supply system when a high-voltage bulk power supply contract is applied to the hot water supply system.

[0049] In the terminal device of the 16th aspect relating to this disclosure, in any one of the 11th to 14th aspects, the power contract may be a time-of-use power contract in which different electricity rates are set for multiple time periods.

[0050] This configuration allows for further improvement in the usability of hot water supply systems that are subject to time-of-use electricity contracts.

[0051] In the terminal device of the 17th aspect of this disclosure, the restricted function in any one of the 11th to 16th aspects may be a function that heats and stores hot water during a specific time period.

[0052] This configuration further improves the usability of a hot water supply system that has the function of heating and storing hot water during specific time periods.

[0053] In the terminal device of the 18th aspect of the present disclosure, in any one of the 11th to 17th aspects, at least one recommended time period may be defined based on the electricity contract. The electricity rate for the recommended time period may be set lower than the electricity rate for other time periods. The terminal control unit may further cause the management program to display a third notification indicating information related to the recommended time period when it receives a command from the management program to perform a particular function of the water heater. The particular function of the water heater may be a function to heat water immediately, or a function to heat and store water during a specific time period.

[0054] With this configuration, it is possible to offer proposals that reduce electricity costs for specific functions of the water heater, depending on the electricity contract. By offering proposals that can save on electricity costs, the usability of the water heating system can be further improved.

[0055] A method for controlling a terminal device according to the 19th aspect of the present disclosure controls a terminal device associated with at least one water heater. The water heater has at least one function of heating water for hot water supply. The method for controlling the terminal device includes the steps of: starting a management program for managing the water heater; receiving contract information relating to the electricity contract applied to the water heater from a server for managing the water heater; obtaining the functions of the water heater restricted by the electricity contract based on the received contract information; and causing the management program to display a first notice relating to the restricted functions and the electricity contract.

[0056] Such control can improve the usability of the hot water system by informing the user of information related to the limited functions and the electricity contract that causes the limitations.

[0057] A computer program of the 20th aspect relating to this disclosure is a computer program that causes a server of a hot water supply system to execute a method for controlling a hot water supply system of the 11th aspect. Alternatively, a computer program is a computer program that causes a terminal device associated with at least one hot water supply unit to execute a method for controlling a terminal device of the 19th aspect.

[0058] Such a computer program controls the server or terminal device of the hot water supply system and notifies the user of information related to restricted functions and the electricity contract that causes those restrictions. Therefore, the usability of the hot water supply system can be improved.

[0059] 《Technical concept》 Before describing specific embodiments of the hot water supply system, method for controlling the hot water supply system, terminal device, method for controlling the terminal device, and computer program related to this disclosure, we will first explain the technical concepts described in this disclosure using an example. In this example, the hot water supply system includes a hot water heater, a terminal device which is a smartphone owned by the user of the hot water heater, and a server which manages the hot water heater. An application for managing the hot water heater is installed on the smartphone.

[0060] The water heater system server retrieves contract information related to the electricity contract applied to the water heater and determines which functions of the water heater are restricted by the electricity contract. The server then displays a first notification related to the restricted functions and the electricity contract that caused the restriction on the smartphone when the application for managing the water heater is launched. In this way, the user is notified not only that the functions are restricted, but also of information related to the electricity contract that caused the restriction. Therefore, the usability of the water heater system can be improved.

[0061] Each of the embodiments described below is an example of the present disclosure. The numerical values, shapes, configurations, steps, and order of steps shown in each of the following embodiments are illustrative and not limiting to the present disclosure. Among the components in Embodiment 1 below, those components that are not described in the independent claim representing the highest-level concept are described as optional components.

[0062] In each of the embodiments described below, variations may be shown for certain elements, and for other elements, arbitrary configurations may be combined as appropriate, with each combined configuration producing its respective effect. In each embodiment, by combining the configurations of each variation, the effects of each variation are achieved.

[0063] In the following detailed descriptions, terms such as “First,” “Second,” etc., are used for illustrative purposes only and should not be understood as expressing or implying relative importance or ranking of technical features. Features designated as “First” or “Second” express or imply that they include one or more such features.

[0064] Embodiment 1 Hereinafter, Embodiment 1 of the hot water supply system, method for controlling the hot water supply system, terminal device, method for controlling the terminal device, and computer program related to this disclosure will be described in detail with reference to the drawings as appropriate.

[0065] <Overall Structure> Figure 1 is a block diagram showing the configuration of the hot water supply system 10 according to Embodiment 1.

[0066] The hot water supply system 10 is a system for heating water to provide hot water to users. As shown in Figure 1, the hot water supply system 10 in this embodiment includes at least one water heater 12, a terminal device 14 associated with the water heater 12, and a server 16 that manages the water heater 12.

[0067] <Water heater 12> The water heater 12 is a storage-type water heater. The water heater 12 includes a tank for storing hot or cold water, a heating device for heating the hot or cold water in the tank, and a water heater control unit for controlling the heating device. By using a tank, the water heater 12 can heat water and store it in the tank before the user needs it. For example, the amount of hot water that can be used in a day can be heated and stored overnight the previous day, and the stored hot water can be used on the day.

[0068] The heating device of the water heater 12 may be an electric type using an electric heater, an electric type using a heat pump, or a hybrid type using electricity and gas. The heating device receives power according to the power receiving settings corresponding to the applicable power contract and uses the received power to heat water. The heating device can heat water to a low temperature (e.g., 40°C to 65°C) or a high temperature (e.g., 65°C to 95°C). The hot water can be mixed with cold water at a predetermined temperature (e.g., 42°C) before being supplied. Furthermore, although this disclosure will be described below using a water heater 12 and hot water supply system 10 for residential use, the water heater 12 and hot water supply system 10 may be for commercial, accommodation, or industrial use, etc.

[0069] The hot water supply control unit or the server 16 (described later) can implement functions such as a water heating function, a function to display the water heating status, or a function to automatically fill the bathtub. Furthermore, the hot water supply control unit or the server 16 can implement various extended functions using the water heating function. As an example of an extended function, the water heater 12 can heat water at a specific time at night and store it in a tank, instead of heating it during the day, in order to utilize relatively inexpensive nighttime electricity. As an example of an extended function, the water heater 12 can heat water and store it in a tank in preparation for water outages or power outages if it detects or predicts the occurrence of a disaster such as an earthquake or typhoon. As an example of an extended function, the water heater 12 can heat water and store it in a tank in preparation for water outages or power outages if it receives information related to a disaster warning, alert, special warning, or evacuation order. As an example of an extended function, the water heater 12 can immediately heat water and store it in a tank in response to user instructions. The amount of hot water heated may be enough to fill the tank, enough to bring the water level in the tank to a certain point, or a predetermined fixed amount.

[0070] <Terminal device 14> The terminal device 14 is associated with the water heater 12. For example, the terminal device 14 is a device for managing the water heater 12. One terminal device 14 may be associated with one water heater 12, or it may be associated with multiple water heaters 12. The terminal device 14 may be, for example, a remote controller for the water heater 12. Alternatively, the terminal device 14 may be a controller capable of managing and controlling multiple home appliances, including the water heating system 10. Or, the terminal device 14 may be an information terminal device such as a smartphone or tablet. In one embodiment, the terminal device 14 is an external device not included in the water heating system 10.

[0071] The terminal device 14 includes a terminal display unit 142, a terminal communication unit 144 capable of communicating with a server 16 for managing the water heater 12, and a terminal control unit 146 that manages the terminal display unit 142 and the terminal communication unit 144.

[0072] The terminal display unit 142 can display information necessary for realizing the functions of the water heater 12. For example, the terminal display unit 142 has a graphical user interface (GUI), and can use the GUI to display the heating status, the set water temperature, and activation buttons for various functions.

[0073] The terminal device 14 can communicate with the water heater 12 and / or the server 16 via the terminal communication unit 144. For example, if the terminal device 14 is a smartphone, it may communicate with the water heater 12 and / or the server 16 via the internet. If the terminal device 14 is a remote controller for the water heater 12, it may communicate with the water heater 12 via infrared or Bluetooth®. The terminal device 14 may also communicate directly or indirectly with an external information source 20 to obtain some of the information used to realize the functions of the water heater 12 from the external information source 20.

[0074] External information source 20 is a source of information that provides information on services not directly related to the hot water supply system 10, such as weather information or information on disasters, warnings, or advisories for a specific area. For example, external information source 20 may be the Japan Meteorological Agency's website. Server 16 may transfer the information obtained from external information source 20 to the hot water heater 12 or terminal device 14.

[0075] The terminal communication unit 144 can also send and receive Internet packets when communicating with the server 16, etc. As described above, the air conditioning control unit may cooperate with the server 16 and / or the water heater 12 via the terminal communication unit 144. The terminal communication unit 144 may communicate with the server 16, the water heater 12, and the external information source 20 in accordance with standards such as Wi-Fi®, IEEE802.2, IEEE802.3, 3G, LTE, etc., and send and receive data. In addition to the Internet, the terminal communication unit 144 may communicate via intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication network, infrared, Bluetooth®, etc.

[0076] The terminal control unit 146 controls the terminal display unit 142 and the terminal communication unit 144. The terminal control unit 146 includes, for example, a memory that stores a program and a processing circuit corresponding to a processor such as a CPU (Central Processing Unit). The functions of the terminal control unit 146 may be composed solely of hardware, or they may be realized by a combination of hardware and software. The terminal control unit 146 realizes predetermined functions by reading data and programs stored in memory and performing various arithmetic operations.

[0077] Furthermore, a management program with a GUI may be installed on the terminal device 14 in order to manage the water heater 12. In the following, this disclosure will describe an application specifically for the water heater 12 as the management program. However, the management program may also be an application common to other home appliances, or a web browser that can log in to an online platform provided by the server 16 to manage the water heater 12.

[0078] <Server 16> Server 16 is a server that controls at least one water heater 12. For example, Server 16 may cause the water heater 12 to perform at least one of its functions via the Internet. Server 16 can control multiple water heaters 12 located in different locations. Server 16 can also communicate with terminal devices 14 and external information sources 20 via the Internet.

[0079] Server 16 may be used for purposes other than executing the method for controlling the hot water supply system described later. For example, Server 16 may be a management server for the manufacturer of at least one hot water heater 12 for managing the water heater 12 or for collecting data. Alternatively, Server 16 may be an application server.

[0080] <Electricity contract> A power contract is an electricity supply and demand agreement between an electricity consumer and a power company, and is also called an electricity contract. For the use of electrical appliances and equipment, consumers apply the power contract to those electrical appliances, that is, they configure the power receiving settings for the electrical appliances based on the power contract. The electrical appliances receive power according to the power receiving settings corresponding to the applicable power contract and perform their respective functions. The power contract as used in this disclosure is applicable to water heaters 12 and hot water supply systems 10 installed in any location, such as apartment buildings, areas containing multiple individual residences, commercial facilities, factories, medical facilities, and accommodation facilities.

[0081] There are various types of electricity contracts, such as flat-rate contracts, usage-based contracts, high-voltage bulk power supply contracts, time-of-use contracts, and peak-reduction time-of-use contracts. Of these, the following two types can particularly restrict the functions of the water heater 12.

[0082] One type of electricity contract that may limit the functionality of the water heater 12 is a bulk high-voltage electricity contract, where high-voltage electricity is received collectively in order to transform the high-voltage electricity and distribute it to multiple users. One example of applying a bulk high-voltage electricity contract is that, instead of each apartment in a building contracting individually with the power company, the entire building can enter into a single electricity contract and receive electricity collectively. By entering into a high-voltage contract for the entire building, rather than each apartment having a low-voltage contract, it is possible to lower the unit price of electricity and procure cheaper electricity.

[0083] However, in high-voltage bulk power contracts, relatively inexpensive off-peak electricity rates are generally not provided. Also, since the unit price of electricity is calculated based on the maximum amount of electricity used within a recent period (for example, within 12 months), the maximum amount of electricity used by the entire apartment building must be limited in order to get a lower unit price. The maximum amount of electricity used is calculated based on the average amount of electricity used at regular intervals (for example, every 30 minutes). In facilities where a high-voltage bulk power contract is provided, the function of many water heaters 12 simultaneously heating water at the same time may be restricted in order to level the overall load. In other words, the function of heating and storing hot water at a specific time may be restricted by the power contract.

[0084] Another type of electricity contract that may limit the functionality of the water heater 12 is a time-of-use electricity contract, where different electricity rates are set for different time periods. For example, the day may be divided into three time periods: "nighttime," "daytime," and "other," with different electricity rates set for each time period. To level the load, electricity companies generally set lower rates for nighttime or late-night hours than for other time periods. In this disclosure, the time periods in which such relatively lower electricity rates are set are referred to as "recommended time periods."

[0085] However, conversely, heating water outside of the recommended time zone may result in higher electricity bills. For example, heating water during a specific time in the daytime in accordance with a sunny weather forecast will result in higher electricity bills because off-peak electricity cannot be used. Depending on the model of the water heater 12 or the settings of the water heating system 10, this function may be restricted when a time-of-use electricity contract is applied in order to avoid such situations.

[0086] <Control of the server 16 of the hot water supply system 10> Figure 2 is a flowchart of an example of a method for controlling the hot water supply system in Embodiment 1, which includes steps S110 to S130. Hereinafter, using the flowchart in Figure 2, we will explain a control method for controlling the server 16 of the hot water supply system 10 in Figure 1 and displaying notifications to improve the usability of the hot water supply system 10. This control method can improve the usability of the hot water supply system 10.

[0087] First, the server 16 obtains contract information related to the power contract applied to the water heater 12 (step S110). For example, the server 16 may periodically query the water heater 12 to obtain the power contract or power receiving settings applied to the water heater 12, the current operating status, and the setting parameters entered by the user. The water heater 12 may also proactively notify the server 16 of changes when a new power contract or power receiving settings are applied, when the operating status changes, or when new setting parameters are entered.

[0088] The contract information may include the name of the electricity contract, at least a part of the contents of the electricity contract, and / or the power receiving settings under the electricity contract. In one embodiment, when an electricity contract is applied, the water heater 12 stores the contract information in its storage device. When the water heater 12 receives an inquiry about the contract information from the server 16, or when it intends to notify the server 16 of the contract information, it reads the contract information stored in its storage device and sends it to the server 16. In one embodiment, the terminal device 14 stores the contract information, and the server 16 queries the terminal device 14 to obtain the contract information.

[0089] Next, the server 16 determines, based on the acquired contract information, the functions of the water heater 12 that are restricted by the power contract (step S120). In one embodiment, the server 16 maintains a list of functions of the water heater 12 in its storage device or database. As described above, certain functions of the water heater 12 may be restricted by the power contract. The list of functions may include, for example, the name or identifier of the function of the water heater 12, a summary or content of the function, whether or not it is affected by a particular power contract, whether or not it is restricted by a particular power contract, the content of the effect or restriction, notes, the name or identifier of the model that has the function, and / or the communication method used for the function.

[0090] In one embodiment, the server 16 stores a list of functions for each power contract that may be the reason for the limitations on the functions of the water heater 12. Figure 3A is an example of a list of functions for the water heater in Embodiment 1. In the list of functions in Figure 3A, for a specific power contract (for example, high-voltage bulk power supply), there are items for the name of the function and whether or not that function is limited by the power contract. The server 16 obtains the name of the power contract, etc. from the contract information, selects the list of functions corresponding to that power contract, and determines the limited functions based on the list of functions.

[0091] In another embodiment, the server 16 stores a single function list corresponding to multiple power contracts. Figure 3B shows another example of the function list for the water heater in Embodiment 1. In the function list in Figure 3B, there are items for the name of the function of the water heater 12, whether or not the function is restricted by the power contract, and the name of the power contract that is the reason for the restriction. The server 16 obtains the name of the power contract from the contract information and determines the function that is restricted by the power contract by comparing the name with the function list.

[0092] In one embodiment, the function of the water heater 12 that may be limited by the electricity contract is the function of heating and storing hot water during specific time periods. For example, the water heater 12 has the following functions: "Daytime shutoff": A function that prevents water from being heated during daytime hours in order to utilize nighttime electricity. "Sunshine Solar Charge": A function that uses solar power to heat water, allowing it to heat and store water at specific times during the day according to the sunny weather forecast. "Emergency Water Heating": A function that heats water and stores it in a tank when information related to a disaster warning, alert, special warning, or evacuation order is received.

[0093] If all of these numerous water heaters 12 were to heat water during specific times such as at night, the maximum power consumption would increase. Therefore, these functions are restricted for power contracts with high-voltage bulk power supply and time-of-use pricing. When the server 16 checks the function list under "high-voltage bulk power supply," it can see that the functions "daytime shutdown," "solar charging," and "emergency water heating" are restricted.

[0094] In one embodiment, the water heater 12 has functions that are not limited by the electricity contract but are affected by it. For example, the water heater 12 has a function called "reheating" that immediately heats water according to the user's manual instruction. It is conceivable that the user would want the water heater 12 to perform "reheating" because they want to use hot water immediately or in the near future. Restricting immediate heating according to the user's instruction may actually decrease usability, so it is not necessary to restrict the reheating function. However, since electricity charges may be higher depending on the timing (time of day) when reheating is performed, it can be said that the reheating function is affected by the electricity contract. As shown in Figure 3B, the function list may also include items for the name of the function affected by the electricity contract and the name of the electricity contract that is the reason for the restriction. The server 16 can determine which functions of the water heater 12 are affected by the electricity contract based on the contract information.

[0095] Next, the server 16 causes the terminal device 14 to display a first notification relating to the restricted function and the power contract that is the reason for the restriction (step S130). In one embodiment, the first notification includes the name and / or content of the restricted function and the power contract that is the reason for the restriction. In another embodiment, the first notification includes the name of the restricted function and, instead of the name of the power contract that is the reason for the restriction, includes a statement to the effect that "the displayed function is restricted due to the power contract." The first notification may further include functions that are affected by the power contract. When the server 16 causes the terminal device 14 to display the first notification, the terminal device 14 may display the first notification on the GUI of the management program via the terminal display unit 142.

[0096] This completes the control of the hot water supply system 10 to display the first notification. With this configuration and control, the server 16 notifies the user via the terminal device 14 of information related to the restricted functions and the power contract that is the reason for the restriction. Thus, the usability of the hot water supply system 10 can be improved. Furthermore, the usability of the hot water supply system 10 can be further improved for hot water supply systems to which high-voltage bulk power supply and / or time-of-use power contracts apply. In addition, since it can accommodate the function of heating and storing hot water during specific time periods, which is often restricted, the usability of a hot water supply system 10 with such a function can be further improved.

[0097] <Timing of display of the first notification> The server 16 may display a first notification to the terminal device 14 before receiving a command from the terminal device 14 to execute a restricted function. In one embodiment, the terminal device 14 can display execution buttons corresponding to the functions of the water heater 12 on the GUI of the management program and receive user commands via the GUI. When it detects that an execution button has been pressed, the terminal device 14 sends a command to the server 16 indicating that the user intends to have the water heater 12 execute the function corresponding to that execution button. Therefore, the server 16 can display a first notification to the management program before the user presses an execution button corresponding to a specific function displayed on the GUI of the management program.

[0098] For example, the server 16 may display the first notification when the management program is started, within a certain time after startup, or when it determines that a button is about to be pressed. If the terminal display unit 142 is a capacitive touch panel, the terminal device 14 can determine whether or not the execution button is about to be pressed based on the detection of a change in capacitance. The first notification may be text and / or an image on the top page of the management program, a pop-up display, or a push notification. The first notification may also include an icon, text, or markings to transition from the current screen to a screen showing the details of the power contract.

[0099] Figure 4 shows an example of the first notification in Embodiment 1. In the embodiment shown in Figure 4, the first notification 42 is displayed when the management program for managing the water heater 12 is started. The first notification 42 shown on screen 32 includes the names of the restricted functions, "Emergency Water Heating" and "Solar Charge," as well as an explanation stating that "the displayed functions are restricted due to the power contract."

[0100] Displaying the first notification at this timing allows users to learn about the restrictions before actually performing the restricted functions. This further improves the usability of the hot water supply system 10.

[0101] <Control of terminal device 14> As described above, the terminal device 14 can display the first notice in order to improve the usability of the hot water supply system 10. The disclosure also provides a method for controlling the terminal device 14.

[0102] Figure 5 is a flowchart of an example of a method for controlling the terminal device 14 in Embodiment 1, and this method includes steps S210 to S240. Hereinafter, using the flowchart in Figure 5, a control method for controlling the terminal device 14 of the hot water supply system 10 in Figure 1 and displaying notifications to improve the usability of the hot water supply system 10 will be described. This control method can improve the usability of the hot water supply system 10.

[0103] The terminal control unit 146 starts a management program for managing the water heater 12 (step S210). The terminal control unit 146 receives contract information related to the electricity contract applied to the water heater 12 via the terminal communication unit 144 (step S220). The contract information can be received from the server 16 or the water heater 12.

[0104] Next, the terminal control unit 146 acquires the functions of the water heater 12 that are restricted by the power contract based on the received contract information (step S230). In one embodiment, the server 16 incorporates the results of its determination regarding the restricted functions into the contract information and then transmits the contract information to the terminal device 14. That is, the terminal device 14 directly acquires the contents of the restricted functions from the server 16. In another embodiment, the terminal device 14 receives the contract information described in step S110 from the server 16, and then the terminal control unit 146 determines the restricted functions itself as in step S120.

[0105] Then, the terminal control unit 146 causes the management program to display a first notification related to the restricted function and the power contract that is the reason for the restriction via the terminal display unit 142 (step S240). For example, the terminal control unit 146 may display the first notification 42 on the application GUI screen 34, as shown in Figure 4. This completes the control for displaying the first notification 42 in the control method of the terminal device 14.

[0106] This disclosure also provides a computer program and storage medium for controlling the hot water supply system 10 or terminal device 14.

[0107] In one embodiment, a computer program is provided that is used to execute the method for controlling the hot water supply system 10 described above on the server 16 of the hot water supply system 10. Also in one embodiment, a computer program is provided that is used to execute the method for controlling the terminal device 14 described above on the terminal device 14.

[0108] In one embodiment, the computer program described above is stored in a non-temporary computer-readable storage medium. The control method described above is implemented when the computer program is read and executed by the server 16 or the terminal control unit 146 of the terminal device 14.

[0109] According to the configuration of the hot water supply system 10, the configuration of the terminal device 14, the control method, and the computer program, information related to the limited functions and the electricity contract that causes the limitations is notified to the user via the terminal device 14. Therefore, the usability of the hot water supply system 10 can be improved.

[0110] Embodiment 2 <Control when electricity contract changes> In Embodiment 2, when the electricity contract is changed, the user can be further notified about the change and its impact.

[0111] Figure 6 is a flowchart of an example of a method for controlling the hot water supply system in Embodiment 2. The contents of steps S310 to S330 in Figure 6 are the same as steps S110 to S130 in Figure 1 of Embodiment 1, so the redundant explanation is omitted here. Embodiment 2 differs from Embodiment 1 in that the method for controlling the hot water supply system 10 further includes steps S340 and S350.

[0112] When a user enters into a different electricity contract with a power company, procedures are followed to apply the new electricity contract (i.e., the modified electricity contract) and the corresponding power receiving settings to the user's electrical appliances and equipment. These electrical appliances then receive power according to the new power receiving settings and perform their respective functions.

[0113] The server 16 determines whether it has received a contract change notification indicating that the electricity contract applied to the water heater 12 has been changed (step S340). In one embodiment, the new electricity contract is changed without going through the terminal device 14. In this case, when the new electricity contract is applied, the water heater 12 stores the contract information related to the new electricity contract and sends a contract change notification to the server 16. In another embodiment, the new electricity contract is changed via an application on the terminal device 14. In this case, when the new electricity contract is applied, the contract information related to the new electricity contract may be stored in both the terminal device 14 and the water heater 12, and the terminal device 14 or the water heater 12 sends the stored contract change notification to the server 16. In yet another embodiment, the water heater 12 sends a contract change notification to the server 16 when responding to a periodic inquiry from the server 16.

[0114] When the server 16 receives a contract change notification, it causes the terminal device 14 to display a second notification containing information related to the changed electricity contract (step S350). In one embodiment, the second notification includes the name and / or content of the changed electricity contract. Figure 7 shows an example of the second notification in Embodiment 2. The second notification 44 is displayed on the GUI of the management program that manages the water heater 12 and notifies the user that the electricity contract applicable to the water heater 12 has been changed. The second notification 44 may include an icon, text, or markings to transition from the current screen 34 to a screen showing details of the changed electricity contract.

[0115] The timing for displaying the second notification 44 may be, for example, when a contract change notification is received, when the management program starts up, or within a certain period of time after the management program starts up. The second notification 44 may be text and / or an image on the top page of the management program, a pop-up display, or a push notification.

[0116] In response to the control of the server 16 described above, the terminal device 14 may perform the following controls. For example, if a new power contract is changed without going through the terminal device 14, the terminal device 14 will display the second notification 44 on the management program's GUI when it receives a contract change notification from the server 16. On the other hand, if a new power contract is changed via the terminal device 14, the terminal device 14 may display the second notification 44 on the management program's GUI when the contract is changed or when it receives a contract change notification from the server 16.

[0117] This completes the control process for displaying the second notification 44. Such control can further improve the usability of the hot water system by notifying users of changes in their electricity contracts.

[0118] Furthermore, the second notice 44 may include additional information relating to functions whose restrictions are lifted or restricted as a result of the changed electricity contract. As described in step S120 above, the server 16 can determine, for a given electricity contract, the functions of the water heater 12 that are restricted / affected by that electricity contract. By determining the functions restricted by the electricity contract before and after the change and comparing the determination results, it is possible to determine which functions are whose restrictions are lifted and which functions are newly restricted as a result of the changed electricity contract.

[0119] Furthermore, Notice 44 2 may include the names and / or descriptions of the functions restricted by the amended electricity contract and the functions whose restrictions are lifted, and may further include the functions affected by the amended electricity contract.

[0120] In the above description, the server 16 and terminal device 14 display the second notice 44 after the electricity contract applicable to the water heater 12 has actually been changed, but they can also display the second notice 44 before the change has actually occurred.

[0121] If the electricity contract can be identified, the functions that will be restricted by the electricity contract before and after the change can be determined by comparing it with the function list. Therefore, it is possible to determine which functions will have their restrictions lifted and which functions will have new restrictions imposed as a result of the changed electricity contract before actually making the change. For example, when the server 16 receives information related to the candidate electricity contract to be changed from the user via the management program of the water heater 12, it can also determine which functions will have their restrictions lifted and which functions will have new restrictions imposed as a result of the candidate electricity contract to be changed.

[0122] Let's assume that the electricity contract currently provided to the water heater 12 is a metered rate system, the proposed electricity contract is a high-voltage bulk power supply system, and there are no functions restricted by the metered rate system. We will now explain the case where functions are restricted by the high-voltage bulk power supply system, as shown in Figure 3A. In this case, there are no functions whose restrictions are lifted, while the functions of "daytime stop," "sunlight solar charge," and "emergency boiling" are restricted by the proposed electricity contract. Server 16 may display a notification that includes the explanation, "If you change your electricity contract to a high-voltage bulk power supply system, the functions of 'daytime stop,' 'sunlight solar charge,' and 'emergency boiling' will be restricted."

[0123] This type of control allows for specific notification to users regarding the impact of changes in their electricity contracts. Therefore, the usability of the hot water supply system can be further improved.

[0124] Embodiment 3 <Suggestions for saving on electricity bills> In Embodiment 3, the hot water supply system can offer a proposal to reduce electricity costs according to the electricity contract, in relation to the functions of the water heater 12, which may be affected by the electricity contract.

[0125] Figure 8 is a flowchart of an example of a method for controlling the hot water supply system in Embodiment 3. The contents of steps S410 to S430 in Figure 8 are the same as steps S110 to S130 in Figure 1 of Embodiment 1, so the redundant explanation is omitted here. Embodiment 3 differs from Embodiment 1 in that the control method of the hot water supply system 10 further includes steps S440 to S470.

[0126] To make a recommendation, the server 16 determines at least one recommended time zone based on the electricity contract applied to the water heater 12 (step S440). As mentioned above, if the electricity contract is a time-of-use pricing system, different electricity rates are set for multiple time zones. For time-of-use pricing systems, the server 16 determines that at least one time zone in which the electricity rate is set lowest is the recommended time zone. That is, the electricity rate for the recommended time zone is set lower than the electricity rates for other time zones. On the other hand, for electricity contracts in which the same electricity rate is set for all time zones, for example, for high-voltage bulk power supply or flat-rate pricing systems, the server 16 may determine that "there is no recommended time zone."

[0127] The functions of the water heater 12 that may be affected by the electricity contract can be determined by referring to the function list shown in Figure 3B. For example, the function to instantly heat water, or the function to heat and store water during specific time periods, may result in higher electricity charges depending on the timing (time period) of execution and the recommended time period. The function to instantly heat water is, for example, the "reheating" function shown in Figure 3B. The function to heat and store water during specific time periods includes, for example, the "daytime stop," "solar charge," and "emergency heating" functions shown in Figure 3B.

[0128] Before executing any functions that may be affected by the power contract, server 16 compares the current time period with the recommended time period (step S450) and determines whether the current time period is included in the recommended time period (step S460). The current time period may be defined in fixed time increments (for example, 0.5-hour increments, 1-hour increments, or 2-hour increments). For example, if the recommended time period is "23:00~07:00" and the current time period is "22:00~23:00", it is determined that the current time period is not included in the recommended time period.

[0129] If the current time period is not included in the recommended time period, the server 16 causes the terminal device 14 to display a third notification indicating information related to the recommended time period (step S470). Figure 9 is an example of the third notification in Embodiment 3. In the embodiment of Figure 9, the third notification 46 shown on the management program screen 36 includes the name and content of the recommended time period (for example, "Nighttime electricity: 23:00~07:00"). The third notification 46 may also include an explanation (suggestion) to the effect that "electricity charges will be lower if certain functions are performed during the recommended time period."

[0130] Figure 10 shows another example of the third notification in Embodiment 3. In the embodiment of Figure 10, the third notification 46 shown on the management program screen 38 includes information related to the recommended time zone that is after the current time zone and closest to the current time zone. The server 16 determines the recommended time zone that is after the current time zone and closest to the current time zone as the specified time zone. The third notification 46 may also include information on how much time is left from the current time until the start time of the specified time zone. For example, if the current time is "22:50" and the specified time zone is "23:00~07:00", the time from the current time to the specified time zone can be calculated to be 10 minutes. The server 16 or terminal control unit 146 generates the third notification 46 based on this calculation result.

[0131] In the embodiment shown in Figure 10, based on the calculation result that the time from the current time to the specified time period is 10 minutes, a third notification 46 is generated that includes the suggestion, "According to your electricity contract, nighttime electricity rates will apply in 10 minutes." Furthermore, the third notification 46 includes a "Execute Now" button and a "Execute Savings" button. When the "Execute Now" button is pressed, the terminal device 14 sends the instruction "Execute Now" to the water heater 12 and / or server 16, and the water heater 12 immediately executes the function specified by the user. On the other hand, if the user wants to take the suggestion and wait until the recommended time period before executing the function, they may press the "Execute Savings" button. When the "Execute Savings" button is pressed, the terminal device 14 sends the instruction "Execute Savings" to the water heater 12 and / or server 16, and the water heater 12 executes the function specified by the user after the current time has become the recommended time period.

[0132] In one embodiment, the server 16 determines the recommended time period after further considering load leveling within the facility. Figure 11 is a block diagram showing the configuration of the hot water supply system 10 according to Embodiment 3. The hot water supply system 10 includes a plurality of hot water heaters 12a, 12b, and 12c. Each of the hot water heaters 12a, 12b, and 12c is used by a different user and can be managed by the corresponding terminal devices 14a, 14b, and 14c. The server 16 determines the recommended time period as the specified time period, which is after the current time period, satisfies the power consumption conditions, and is closest to the current time period. The server 16 then calculates the time from the current time to the start time of the specified time period and incorporates the calculation result into the third notification 46.

[0133] The power consumption conditions mentioned above are: the number of water heaters 12 scheduled to heat water is below a threshold; the expected power consumption due to heating water is below a first power consumption threshold; or the expected power consumption of the entire facility is below a second power consumption threshold. Because the specified time period is determined by considering the power consumption conditions, it is possible to avoid multiple water heaters 12 simultaneously heating water during a single recommended time period.

[0134] To further equalize the load, server 16 may divide the recommended time period into multiple sub-time periods and determine the sub-time periods that meet the aforementioned conditions as the designated time period. For example, the recommended time period "23:00~07:00" may be divided into eight sub-time periods in one-hour increments, with each sub-time period being a part of the recommended time period. Let's consider a case where the sub-time periods "23:00~24:00" and "00:00~01:00" do not meet the power consumption conditions, but the sub-time period "01:00~02:00" does. In this case, server 16 may determine the sub-time period "01:00~02:00" as the designated time period.

[0135] In one embodiment, the server 16 determines a recommended time zone, taking into account the start time of the specified time zone. If the start time of the specified time zone is too far from when the user wants to perform a function on the water heater 12, it may not meet the user's needs. For example, consider the case where the function the user wants to perform on the water heater 12 is "reheating" or "emergency heating". In this case, the server 16 will propose a start time for the specified time zone via the third notification 46 based on the specified time zone, but only if it is within a predetermined time after the execution button is pressed. For example, if the function to be performed is "solar charging", the server 16 will propose a start time for the specified time zone via the third notification 46 based on the specified time zone, but only if it is within the same day.

[0136] This completes the control that provides a proposal for lower electricity rates according to the electricity contract via the third notification 46. In response to the control of the server 16 described above, the terminal device 14 may perform the following controls. For example, when the server 16 determines the specified time period and generates the content of the third notification 46, it displays the third notification 46 to the management program before executing any functions that may be affected by the electricity contract. Alternatively, the terminal device 14 may determine the specified time period, generate the content of the third notification 46, and display the third notification 46.

[0137] With this configuration and control, the hot water supply system 10 can offer a proposal that reduces electricity costs according to the electricity contract for functions that may be affected by the electricity contract. By offering a proposal that saves on electricity costs, the usability of the hot water supply system 10 can be further improved.

[0138] Embodiment 4 <Controls to save on electricity bills> In Embodiment 4, the hot water supply system 10 can automatically distribute the execution time of functions of the water heater 12, which may be affected by the electricity contract, in order to reduce electricity costs.

[0139] Embodiment 4 differs from Embodiment 3 in that it automatically executes functions that may be affected by the electricity contract during a specified time period. In Embodiment 4, as shown in Figure 11, the hot water supply system 10 includes a plurality of water heaters 12a, 12b, and 12c.

[0140] Figure 12 is a flowchart of an example of a method for controlling the hot water supply system in Embodiment 4. The contents of steps S510 to S540 in Figure 12 are the same as steps S410 to S440 in Figure 8 of Embodiment 3, so the redundant explanation is omitted here. Embodiment 4 differs from Embodiment 3 in that the method for controlling the hot water supply system 10 further includes steps S550 and S560.

[0141] Before executing any functions that may be affected by the power contract, the server 16 designates at least a portion of the recommended time slots as specified time slots for each water heater 12 (step S550). Then, the server 16 instructs each water heater 12 to heat water during the specified time slots (step S560).

[0142] Functions that may be affected by the electricity contract include the function of instantly heating water, or the function of heating and storing water during a specific time period. In step S550, the server 16 may specify a designated time period as described in Embodiment 3. For example, in order to level the load, the server 16 determines the designated time period to be a recommended time period that is after the current time period, satisfies the power consumption conditions, and is closest to the current time period.

[0143] The specified time period may be the entire recommended time period, or it may be at least one sub-time period within the recommended time period. Furthermore, for functions whose execution time is longer than one sub-time period, server 16 may combine multiple sub-time periods into a single specified time period. In addition, as described above, server 16 may determine the recommended time period after further considering the start time of the specified time period.

[0144] In one embodiment, in order to level the load, the designated time periods for at least two water heaters 12 are different. That is, the designated time periods are distributed among multiple water heaters 12. For example, when the server 16 receives information about a heavy rain warning from an external information source 20, it can cause multiple water heaters 12a, 12b, and 12c to execute the "emergency boiling" function. In order to level the load, instead of having these water heaters 12 boil water all at once when the warning information is received, they are given different designated time periods and then made to boil water during those designated time periods.

[0145] This completes the process of automatically distributing the execution time of functions of the water heater 12, which may be affected by the electricity contract, before execution. With this configuration, it is possible to execute a function of the water heater system in a way that reduces the electricity cost incurred by executing that function, based on the electricity contract. Therefore, the usability of the water heater system can be further improved.

[0146] Furthermore, this disclosure also provides a computer program and storage medium for controlling the hot water supply system 10 or terminal device 14, corresponding to embodiments 2 to 4.

[0147] The above are merely specific embodiments of the Disclosure, and the scope of protection of the Disclosure is not limited thereto. The Disclosure includes, but is not limited to, the contents described in the drawings and the specific embodiments described above. Various embodiments or examples disclosed can be combined without departing from the scope or spirit of the Disclosure. Any modifications that do not depart from the functional and structural principles of the Disclosure are within the scope of the claims. [Explanation of Symbols]

[0148] 10. Hot water supply system 12, 12a, 12b, 12c Water heater 14, 14a, 14b, 14c Terminal devices 142 Terminal display unit 144 Terminal Communication Unit 146 Terminal Control Unit 16 servers 20 External information sources Screens 32, 34, 36, and 38 42 First notice 44 Second Notice 46 Third Notice

Claims

1. At least one water heater having at least one function of boiling water for hot water supply; a terminal device associated with the water heater; a server that manages the water heater; Including, The server Obtain contract information related to the electricity contract applied to the water heater; Determine the functions of the water heater that are restricted by the power contract based on the acquired contract information; displaying, on the terminal device, a first notification relating to the restricted function and the power contract that is the reason for the restriction; Hot water system.

2. The server further causes the terminal device to display the first notification before receiving a command from the terminal device to execute the restricted function. The hot water supply system according to claim 1 .

3. When the server receives a contract change notice indicating that the electricity contract applied to the water heater has been changed, the server further causes the terminal device to display a second notice; the second notification includes information related to the modified electricity contract. The hot water supply system according to claim 1 .

4. the second notice further includes information related to functions that will be released from restrictions or functions that will be restricted due to the changed electricity contract; The hot water supply system according to claim 3 .

5. The electricity contract is a high-voltage bulk power receiving electricity contract for receiving high-voltage electricity in a lump sum in order to transform the high-voltage electricity and distribute it to a plurality of users, The hot water supply system according to claim 1 .

6. The electricity contract is a time-of-use pricing contract in which different electricity rates are set for multiple time periods. The hot water supply system according to claim 1 .

7. The restricted function is to boil and store hot water during a specific time period. The hot water supply system according to claim 1 .

8. The server further determining at least one recommended time period based on the electricity contract; Before executing the function of immediately boiling water or the function of boiling and storing water for a specific time period, the current time period is compared with the recommended time period; If the current time period is not included in the recommended time period, displaying a third notification on the terminal device indicating information related to the recommended time period; The electricity rate for the recommended time period is set lower than the electricity rate for other time periods. The hot water supply system according to claim 1 .

9. The hot water system includes a plurality of hot water heaters; The server further determining at least one recommended time period based on the electricity contract; designating at least a portion of the recommended time periods as designated time periods for each of the water heaters before executing a function of instantly boiling hot water or a function of boiling hot water and storing it during a specific time period; causing each of the water heaters to boil water during the designated time period; The electricity rate for the recommended time period is set lower than the electricity rate for other time periods, The designated time periods of at least two of the water heaters are different time periods. The hot water supply system according to claim 1 .

10. 1. A method of controlling a hot water system, comprising: The hot water supply system includes at least one water heater having at least one function of boiling water for hot water supply, a terminal device associated with the water heater, and a server that manages the water heater; The method for controlling a hot water system comprises: The server acquires contract information related to an electricity contract applied to the water heater; a step in which the server determines functions of the water heater that are restricted by the power contract based on the acquired contract information; The server causes the terminal device to display a first notification related to the restricted function and the power contract that is the reason for the restriction; Including, A method for controlling a hot water system.

11. A terminal device associated with at least one water heater having at least one function of boiling water for hot water supply, A terminal display unit; a terminal communication unit capable of communicating with a server for managing the water heater; a terminal control unit that manages the terminal display unit and the terminal communication unit; Including, The terminal control unit launching a management program for managing the water heater; receiving contract information related to an electricity contract applied to the water heater via the terminal communication unit; Based on the received contract information, the functions of the water heater that are restricted by the power contract are acquired; causing the management program to display, via the terminal display unit, a first notification relating to the restricted function and the power contract that is the reason for the restriction; Terminal device.

12. the terminal control unit further causes the management program to display the first notification before receiving a command from the management program to execute the restricted function. The terminal device according to claim 11.

13. the terminal control unit further causes the management program to display a second notification when receiving from the server a contract change notification indicating that the electricity contract applied to the water heater has been changed; the second notification includes information related to the modified electricity contract. The terminal device according to claim 11.

14. the second notice further includes information related to functions that will be released from restrictions or functions that will be restricted due to the changed electricity contract; The terminal device according to claim 13.

15. The electricity contract is a high-voltage bulk power receiving electricity contract for receiving high-voltage electricity in a lump sum in order to transform the high-voltage electricity and distribute it to a plurality of users, The terminal device according to claim 11.

16. The electricity contract is a time-of-use pricing contract in which different electricity rates are set for multiple time periods. The terminal device according to claim 11.

17. The restricted function is to boil and store hot water during a specific time period. The terminal device according to claim 11.

18. At least one recommended time period is defined based on the power contract; The electricity rate for the recommended time period is set lower than the electricity rate for other time periods, When the terminal control unit receives a command from the management program to execute a function of instantly boiling hot water or a function of boiling hot water and storing it during a specific time period, the terminal control unit further causes the management program to display a third notification indicating information related to the recommended time period. The terminal device according to claim 11.

19. 1. A method for controlling a terminal device associated with at least one water heater, comprising: The water heater has at least one function of boiling water for hot water supply, The method for controlling the terminal device includes: A step of starting a management program for managing the water heater; receiving contract information related to an electricity contract applied to the water heater from a server for managing the water heater; acquiring functions of the water heater restricted by the power contract based on the received contract information; causing the management program to display a first notification related to the restricted functionality and the electricity contract; Including, A method for controlling a terminal device.

20. A computer program comprising: A computer program for causing a server of a hot water supply system to execute the method for controlling a hot water supply system according to claim 10; A computer program for causing a terminal device associated with at least one water heater to execute the method for controlling a terminal device according to claim 19. Computer program.

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