Hot water supply system

Abstract

To provide a hot water supply system capable of displaying a plurality of messages on a remote controller in an easily visible manner.SOLUTION: A hot water supply system can display message display screens for displaying messages different depending on information on the basis of the information received by a remote controller from control means on a display part of the remote controller. Display of the message display screen on the display part and display of a normal screen that hides the message display screens can be optionally switched by an operation part during reception of the information by the remote controller. With the remote controller receiving a plurality of pieces of information, when the message display screen is displayed by the operation part, any one of the message display screens is displayed on the display part, and until the message display screen that is being displayed becomes hidden, the other message display screens are hidden. When the message display screen that is being displayed becomes hidden, any one of the other hidden message display screens is displayed on the display part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to hot water systems. [Background technology]

[0002] In many cases, water heaters can send information about the water heater's operating status or abnormal conditions to a remote control installed in the kitchen or bathroom, and notify the user by displaying a message on the screen of the remote control. However, information from the water heater is often sent when the user is not looking at the remote control, and even in such cases, the message needs to be displayed on the screen while the information is being sent so that the user can check the message later. In particular, messages about abnormal conditions must not be erased before the user can check them, so that the user can know the cause or how to deal with the problem.

[0003] In this case, the message continues to be displayed on the screen, which may be annoying for users who want to see the normal screen display. This problem becomes more pronounced as the number of characters in the message increases, making it necessary to impose a limit on either the normal screen display or the message display.

[0004] To address this problem, Patent Document 1 proposes a display method in which a symbol indicating the presence of a message is displayed while the conditions for displaying the message are met, and the user can switch between displaying and hiding the message at any time by operating the device. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2007-178658 A Summary of the Invention [Problem to be solved by the invention]

[0006] Patent Document 1 does not mention the case where multiple messages are displayed. However, in a water heater, multiple pieces of information may occur simultaneously, and it may be necessary to simultaneously display multiple messages on the remote control to notify the user of them, so a display method that can handle such cases is required.

[0007] The present disclosure has been made to solve the above-mentioned problems. It is an object of the present disclosure to provide a hot water supply system that is capable of easily displaying multiple messages on a remote control. [Means for solving the problem]

[0008] The hot water supply system of the present disclosure is a hot water supply system comprising a water heater, a control means for controlling the operation of the water heater, and a remote control connected to the control means and having a display unit and an operation unit, wherein the remote control is capable of displaying a message display screen on the display unit, which displays a different message for each piece of information based on the information received by the remote control from the control means, and while the remote control is receiving information, the operation unit can arbitrarily switch between displaying the message display screen on the display unit and displaying a normal screen which hides the message display screen, and when the remote control is receiving multiple pieces of information and the operation unit displays a message display screen, one of the message display screens is displayed on the display unit, and the other message display screens are hidden until the currently displayed message display screen is hidden, and when the currently displayed message display screen is hidden, one of the other hidden message display screens is displayed on the display unit. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide a hot water supply system that can display multiple messages on a remote control in an easily viewable manner. [Brief description of the drawings]

[0010] [Figure 1] 1 is a configuration diagram of a hot water supply system according to a first embodiment. [Diagram 2]2 is a configuration diagram of a remote control provided in the hot water supply system of the first embodiment. FIG. [Diagram 3] FIG. 4 is a diagram showing an example of a normal screen displayed on a display unit. [Figure 4] FIG. 13 is a diagram showing an example of a message display screen displayed on a display unit. [Diagram 5] 11A and 11B are diagrams illustrating an example of a display method for a message display screen to be displayed on a display unit. [Figure 6] 13A and 13B are diagrams illustrating another example of a display method for a message display screen to be displayed on the display unit. [Figure 7] FIG. 13 is a diagram showing an example of a message display screen on which identification information is displayed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiments will be described with reference to the drawings. The same reference numerals are used to denote common or corresponding elements in each drawing, and the description is simplified or omitted. In the following description, the terms "water", "hot water", "warm water", "hot water" and the like generally mean liquid water, and may include anything from cold water to boiling water. The configurations shown in the following embodiments are examples of the technical ideas related to this disclosure, and may be combined with other known technologies, or multiple technical ideas described in this disclosure may be combined. In addition, it is also possible to omit or modify part of the configuration without departing from the gist of this disclosure.

[0012] Embodiment 1 FIG. 1 is a configuration diagram of a hot water supply system 100 according to the first embodiment. The hot water supply system 100 includes a hot water storage tank unit 1, which is a hot water supply device, a heat pump unit 60 that utilizes a heat pump cycle, and a remote control 71. The heat pump unit 60 and the hot water storage tank unit 1 are connected to each other via a heat pump inlet pipe 41, a heat pump outlet pipe 42, and electrical wiring (not shown). The hot water storage tank unit 1 includes a control unit 70, and the operation of the hot water storage tank unit 1, the remote control 71, and various valves, pumps, and the like provided in the heat pump unit 60 are controlled by the control unit 70 electrically connected thereto. The control unit 70 corresponds to a control means for controlling the operation of the hot water supply device. Each component of the hot water supply system 100 will be described below.

[0013] The heat pump unit 60 functions as a heating means for heating, i.e. boiling, the low-temperature water guided from the hot water storage tank unit 1. The heat pump unit 60 has a compressor 61, a heat exchanger 62 for boiling, an expansion valve 63, and an air heat exchanger 64 connected in a ring shape by a refrigerant circulation pipe 65 to configure a refrigeration cycle (heat pump cycle). The heat exchanger 62 for boiling is for exchanging heat between the refrigerant flowing through the refrigerant circulation pipe 65 constituting the heat pump cycle and the low-temperature water guided from the hot water storage tank unit 1. The HP outlet side thermistor 66 is a temperature sensor for detecting the temperature of the high-temperature water heated by the heat exchanger 62 for boiling, and is provided in the heat pump outlet pipe 42. In order to obtain high-temperature water in the heat pump unit 60, it is preferable that the heat pump cycle uses carbon dioxide as a refrigerant and is operated at a pressure exceeding the critical pressure.

[0014] Meanwhile, the hot water storage tank unit 1 incorporates the following various components or piping. The hot water storage tank 10 is for storing hot water. A water supply pipe 2 for supplying city water is connected to the bottom of the hot water storage tank 10, and a hot water supply pipe 3 for supplying the stored hot water to the outside of the hot water heater is branched off from the second tank upper pipe 44 and connected to the top of the hot water storage tank 10. Hot water heated by the heat pump unit 60 flows into the hot water storage tank 10 from the top of the tank, and low temperature water flows into the hot water storage tank 10 from the bottom of the tank via the water supply pipe 2, so that hot water is stored in the hot water storage tank 10 so that a temperature difference occurs between the top and bottom of the tank. In addition, remaining hot water thermistors 11 and 12 for detecting the temperature distribution of the hot water in the hot water storage tank 10 by changing the mounting height are attached to the surface of the hot water storage tank 10. Based on the temperature distribution obtained by these remaining hot water thermistors 11, 12, the amount of remaining hot water in the hot water storage tank 10 is grasped, and the start and stop of the heating operation of the heat pump unit 60 for the hot water in the hot water storage tank 10 is controlled.

[0015] Additionally, a heat source pump 21 and a utilization-side heat exchanger 22 are built into the hot water storage tank unit 1. The heat source pump 21 is a pump for circulating hot water through various pipes, which will be described later, in the hot water storage tank unit 1. The utilization-side heat exchanger 22 is a heat exchanger for heating water on the secondary side (bathtub circulating water, heating circulating water, etc.) by using high-temperature water supplied from the hot water storage tank 10 or the heat pump unit 60. In this embodiment 1, a bath circulation circuit 51 that circulates hot water in a bathtub 50 will be taken as an example of the secondary side configuration of the utilization-side heat exchanger 22 to explain the configuration.

[0016] The utilization side heat exchanger 22 is installed in the middle of the bath circulation circuit 51. The bath circulation circuit 51 has a bath return pipe 56 that connects the bathtub adapter 80 installed in the bathtub 50 and the secondary side inlet of the utilization side heat exchanger 22, and a bath supply pipe 57 that connects the secondary side outlet of the utilization side heat exchanger 22 and the bathtub adapter 80.

[0017] Along the bath return piping 56 of the bath circulation circuit 51, there are installed a bath circulation pump 52 for circulating the bath water, a bathtub outlet thermistor 53 for detecting the temperature of the bathtub water coming out of the bathtub 50, a flow switch 58 that detects the presence or absence of a circulating water flow by switching ON when the circulating flow rate of the bathtub water reaches a predetermined level or above, a water level sensor 59 that detects the pressure inside the circulation circuit and measures the water level in the bathtub, a circulation micro-bubble generator 54 that introduces micro-bubbles into the circulation circuit, and a water injection micro-bubble generator 55 that introduces micro-bubbles when water is being injected.

[0018] Next, the valves and piping of the hot water storage tank unit 1 will be described. The hot water storage tank unit 1 has a first three-way valve 31, a second three-way valve 32, a four-way valve 33, and a bath hot water supply solenoid valve 34. The first three-way valve 31 and the second three-way valve 32 are flow path switching means having two inlets (port a, port b) through which hot water flows in and one outlet (port c) through which hot water flows out, and are configured to be able to switch the flow path of hot water so that hot water flows in from either port a or port b. The four-way valve 33 is a flow path switching means having two inlets (port b, port c) through which hot water flows in and two outlets (port a, port d) through which hot water flows out, and is configured to be able to switch the flow path form between three paths, that is, paths ab, bd, and cd. The bath hot water supply solenoid valve 34 is opened when hot water is supplied to the bathtub 50.

[0019] The hot water storage tank unit 1 also has a lower tank piping 40, the heat pump inlet piping 41, the heat pump outlet piping 42, a first upper tank piping 43, a second upper tank piping 44, a tank return piping 45, a utilization side heat exchanger primary side inlet piping 46, a utilization side heat exchanger primary side outlet piping 47, a bypass piping 48 and an upper return piping 49.

[0020] The tank lower piping 40 is a flow path connecting the first lower part of the hot water storage tank 10 and the a port of the second three-way valve 32. The heat pump inlet piping 41 is a flow path connecting the c port of the second three-way valve 32 and the inlet side of the heat pump unit 60. The heat pump outlet piping 42 is a flow path connecting the outlet side of the heat pump unit 60 and the c port of the four-way valve 33. The first tank upper piping 43 is a flow path connecting an outlet (second upper part) provided between the center and the upper part of the hot water storage tank 10 and the a port of the first three-way valve 31. The second tank upper piping 44 is a flow path connecting the first upper part of the hot water storage tank 10 and the b port of the first three-way valve 31. The tank return piping 45 is a flow path connecting the a port of the four-way valve 33 and a return port (second lower part) provided between the center and the lower part of the hot water storage tank 10. The use-side heat exchanger primary-side inlet piping 46 is a flow path connected to the c port of the first three-way valve 31 and the primary-side inlet of the use-side heat exchanger 22, and the use-side heat exchanger primary-side outlet piping 47 is a flow path connecting the primary-side outlet of the use-side heat exchanger 22 and the b port of the second three-way valve 32. Furthermore, the bypass piping 48 is a flow path that branches off from between the heat source pump 21 and the inlet side of the heat pump unit 60 in the heat pump inlet piping 41 and is connected to the b port of the four-way valve 33, and the upper return piping 49 is a flow path that branches off from between the first upper part of the hot water storage tank 10 and the b port of the first three-way valve 31 in the second tank upper piping 44 and is connected to the d port of the four-way valve 33.

[0021] 2 is a configuration diagram of a remote control 71 provided in hot water supply system 100 of the first embodiment. Remote control 71 has a display unit 72 that displays information, an operation unit 73 used to input information and commands, and an audio output unit 74 that outputs information by voice. Remote control 71 is connected to control unit 70 by wire or wirelessly, and functions as an input / output device for control unit 70. Remote control 71 may be equipped with a touch screen in which display unit 72 and operation unit 73 are integrated.

[0022] Remote control 71 receives information on the operating state or abnormal state of hot water supply system 100 from control unit 70, and is capable of displaying a message display screen that displays a message based on the received information on display unit 72. While remote control 71 is receiving information, the user can operate operation unit 73 to arbitrarily switch between displaying the message display screen on display unit 72 and displaying a normal screen on display unit 72 without displaying the message display screen.

[0023] 3 is a diagram showing an example of a normal screen displayed on the display unit 72. Screen A is the normal screen when no information requiring a message display has been received from the control unit 70. Screen B is the normal screen when information requiring a message display has been received. It is characterized in that a message can be displayed on part of the screen. When screen B is displayed, the user can display a message display screen by performing a message display operation on the operation unit 73.

[0024] 4 is a diagram showing an example of a message display screen displayed on display unit 72. When the user performs a message end operation using operation unit 73, the currently displayed message display screen is hidden, and the next message display screen is not displayed, and the normal screen is displayed on display unit 72. This allows the user to see the normal screen immediately when he or she wishes to see it.

[0025] Next, in the first embodiment, a case where the remote control 71 receives a plurality of pieces of information from the control unit 70 and needs to display a message display screen for each piece of information will be described with reference to Fig. 5. Screens C, D, and E are message display screens based on different pieces of information. When the user performs a message display operation on screen B, which is the normal screen, screen C is displayed on the display unit 72, and while screen C is displayed, screens D and E are hidden. When screen C becomes hidden due to some condition, screen D, which was hidden, is displayed. When screen D becomes hidden again due to some condition, screen E is displayed.

[0026] In this manner, in this embodiment, when a message display screen is displayed on operation unit 73 while remote control 71 is receiving multiple pieces of information, one of the message display screens is displayed on display unit 72, and the other message display screens are hidden until the currently displayed message display screen becomes hidden, and when the currently displayed message display screen becomes hidden, one of the other hidden message display screens is displayed on display unit 72. This makes it possible to display each message in an easy-to-read manner even when there are multiple messages to be displayed.

[0027] In the above, the condition for hiding the currently displayed message display screen may be a message sending operation by the user via the operation unit 73, or a time-out due to the lapse of a predetermined time. That is, the message display screen being displayed on the display unit 72 may be hidden when the user performs a message sending operation via the operation unit 73, or the message display screen being displayed on the display unit 72 may be hidden when the user does not perform an operation via the operation unit 73 for a predetermined time. This makes it possible to reliably show multiple message display screens to the user.

[0028] In addition, in the above, when the currently displayed message display screen becomes non-display, the next message display screen to be displayed is a message screen that has never been displayed since the user's message display operation. This prevents a message that the user has already confirmed from being displayed again at the same timing, eliminating the hassle of having to re-read something that has already been confirmed, and also avoids the misunderstanding that the number of messages displayed may appear to be large.

[0029] In the above, after all the displayable message display screens have been hidden, the normal screen may be displayed as shown in Fig. 5. This makes it easy to know that all the messages have been displayed.

[0030] Also, as shown in Fig. 6, after all message display screens based on multiple pieces of information being received by remote control 71 are displayed once in a certain order, the display of all message display screens may be repeated again in the same order. In the case of Fig. 6, screens C, D, and E are message display screens based on different pieces of information, and the display of the message display screens is repeated in the order of screens C, D, and E. Repeated display of the message display screens is useful when the user misses a message or wants to read it again.

[0031] In the above, the user may be allowed to perform a message end operation to return to the normal screen before displaying all of the message display screens using the operation unit 73. In other words, when the user performs a message end operation using the operation unit 73, the message display screen being displayed on the display unit 72 may be made non-displayed, and the normal screen may be displayed without displaying the next message display screen. This is useful when the user wants to perform another operation in the middle of a message display, or when the user wants to check only some of the desired messages.

[0032] In the above, identification information may be displayed on each message screen for each piece of information identified by the control unit 70. FIG. 7 shows an example of a method for displaying identification information, where screen G shows message A based on information from the control unit 70 that the user has received an error A, and screen H shows message B based on information from the control unit 70 that the user has received an error B. Identification information such as "Error A" and "Error B" is displayed on each message display screen, which are information from the control unit 70. Identification information is not limited to text, and for example, when a message is displayed based on information from the control unit 70 that the water is being filled, an icon indicating that the water is being filled may be displayed. This prevents the user from mistaking messages based on different information for messages with the same information, and helps the user understand that the message is being displayed after receiving multiple pieces of information.

[0033] In the above, while multiple pieces of information are being received from control unit 70, a message may be displayed on the normal screen indicating that a message and multiple messages can be displayed by operating operation unit 73. This allows the user to see at a glance that hot water supply system 100 is about to notify a user of a message, that the message can be displayed by operating operation, and that multiple messages will be displayed, making it easy to understand when the amount of received information increases or decreases.

[0034] In the above, the message display screen to be displayed first on the display unit 72 after the user performs a message display operation may be determined based on a specific rule. Also, the message display screen to be displayed next when the message display screen being displayed on the display unit 72 becomes invisible may be determined based on a specific rule. As a specific rule, for example, when error information from the control unit 70 is identified by numbers such as "Error 01" and "Error 02" or alphabets such as "Error A" and "Error B", a rule to display the messages in ascending order of numbers or alphabets, or a rule to prioritize messages due to operational malfunctions such as errors and display messages due to information during operation of the product later, etc., may be considered. This makes it easier for users to search for the contents when checking them by making the order of listing in the instruction manual the same as the above rule, prevents users from missing information by displaying information that the user should check first, and helps the user notice when a new message is displayed.

[0035] In the above, the control unit 70 may set a priority for each piece of information, and the message display screen for low-priority information may not be displayed while high-priority information is being received. For example, information related to product malfunctions may be set to "high priority," information related to product functional failures caused by the user's usage method that are not malfunctions may be set to "medium priority," and information related to product operating conditions that are not malfunctions but may be mistaken for malfunctions by the user may be set to "low priority." This helps to prevent urgent messages from being buried and not being seen by messages with a high display frequency and low priority.

[0036] In the above, the remote control 71 may be provided with a human sensor capable of detecting the approach of a person, and when the human sensor detects the approach of a person, the normal screen may be switched to the message display screen without the user having to perform a message display operation using the operation unit 73. This makes it possible to provide the necessary information at a timing when the user approaches the remote control and can check the screen, without performing any special operation.

[0037] In the above, information regarding the number of the current message display screen among the multiple message display screens that can be displayed, such as "current display number / total number," may be displayed on the message display screen. In this way, by displaying the number of the current message display screen among the multiple message display screens and the total number of the multiple message display screens, the user can easily understand the number of the current message, thereby improving user convenience.

[0038] In addition, in the above, a non-display setting means may be provided for setting a message display screen that has been displayed once to be hidden from the next time onwards. For example, the non-display setting means may be an operation using the operation unit 73, or may be the same as a means for changing other settings of the hot water supply system 100, such as a menu. This helps to avoid the hassle of having a large number of messages displayed each time and the increased effort required to reach the desired message by hiding information that the user has checked once and determined to be unnecessary when a large number of message display screens are displayed.

[0039] Various aspects of the present disclosure are summarized below as appendices.

[0040] (Appendix 1) A water heater and A control means for controlling the operation of the water heater; a remote controller connected to the control means and having a display unit and an operation unit; A hot water supply system comprising: a message display screen that displays a different message for each piece of information based on the information received by the remote control from the control means can be displayed on the display unit, and while the remote control is receiving the information, the operation unit can arbitrarily switch between displaying the message display screen on the display unit and displaying a normal screen that does not display the message display screen, When the remote control is receiving multiple pieces of information and the message display screen is to be displayed on the operation unit, one of the message display screens is displayed on the display unit, the other message display screens are not displayed until the currently displayed message display screen becomes hidden, and when the currently displayed message display screen becomes hidden, one of the other hidden message display screens is displayed on the display unit. (Appendix 2) A hot water supply system as described in Appendix 1, wherein when a user performs a message sending operation using the operation unit, the message display screen being displayed on the display unit is made non-display. (Appendix 3) 3. The hot water supply system according to claim 1, wherein the message display screen being displayed on the display unit is hidden if a user does not operate the operating unit for a predetermined period of time. (Appendix 4) A hot water supply system as described in any one of Appendix 1 to Appendix 3, in which when the message display screen currently being displayed on the display unit becomes hidden, the next message display screen to be displayed is a message display screen that has never been displayed among the hidden message display screens. (Appendix 5) A hot water supply system as described in any one of Appendix 1 to Appendix 4, wherein when all of the message display screens based on the information being received by the remote control are hidden, the normal screen is displayed on the display unit. (Appendix 6) A hot water supply system as described in any one of Appendices 1 to 5, wherein all of the message display screens based on the information being received by the remote control are displayed once in a certain order, and then the display of all of the message display screens is repeated again in the certain order. (Appendix 7) A hot water supply system as described in any one of Appendix 1 to Appendix 6, wherein when a user performs a message termination operation using the operating unit, the message display screen being displayed on the display unit is hidden, and the normal screen is displayed without displaying the next message display screen. (Appendix 8) 8. The hot water supply system according to claim 1, wherein the identification information identified by the control means is displayed on the message display screen. (Appendix 9) A hot water supply system as described in any one of appendices 1 to 8, wherein while the remote control is receiving the information, a message is displayed on the normal screen indicating that the message display screen can be displayed by the operation unit. (Appendix 10) The hot water supply system according to any one of claims 1 to 9, wherein the message display screen to be initially displayed on the display unit is determined based on a specific rule. (Appendix 11) A hot water supply system as described in any one of appendix 1 to appendix 10, wherein the message display screen to be displayed next when the message display screen currently being displayed on the display unit becomes hidden is determined based on a specific rule. (Appendix 12) The hot water supply system according to any one of appendices 1 to 11, wherein the control means sets a priority for the information, and makes it impossible to display the message display screen based on the information with a lower priority while the remote control is receiving the information with a higher priority. (Appendix 13) The remote controller includes a human sensor that detects the approach of a person, A hot water supply system as described in any one of Appendix 1 to Appendix 12, characterized in that when the human presence sensor detects the approach of a person, the normal screen is switched to the message display screen. (Appendix 14) A hot water supply system as described in any one of Appendix 1 to Appendix 13, wherein the message display screen displays the number of the current message display screen among the plurality of message display screens and the total number of the plurality of message display screens. (Appendix 15) A hot water supply system as described in any one of appendices 1 to 14, comprising a non-display setting means for changing a setting so that any one of the plurality of message display screens will not be displayed from the next time. [Explanation of symbols]

[0041] 1 hot water storage tank unit, 2 water supply piping, 3 hot water supply piping, 10 hot water storage tank, 11 remaining hot water thermistor, 21 heat source pump, 22 use side heat exchanger, 31 first three-way valve, 32 second three-way valve, 33 four-way valve, 34 hot water solenoid valve, 40 tank lower piping, 41 heat pump inlet piping, 42 heat pump outlet piping, 43 first tank upper piping, 44 second tank upper piping, 45 tank return piping, 46 use side heat exchanger primary side inlet piping, 47 use side heat exchanger primary side outlet piping, 48 bypass piping, 49 upper return piping, 50 bathtub, 51 circulation circuit, 52 circulation pump, 53 bathtub outlet side thermistor, 54 circulation fine bubble generator, 55 Micro-bubble generator for water injection, 56 bath return pipe, 57 bath supply pipe, 58 flow switch, 59 water level sensor, 60 heat pump unit, 61 compressor, 62 heat exchanger for heating, 63 expansion valve, 64 air heat exchanger, 65 refrigerant circulation pipe, 66 HP outlet thermistor, 70 control unit, 71 remote control, 72 display unit, 73 operation unit, 74 audio output unit, 80 bathtub adapter, 100 hot water supply system

Claims

1. A water heater and A control means for controlling the operation of the water heater; a remote controller connected to the control means and having a display unit and an operation unit; A hot water supply system comprising: a message display screen that displays a different message for each piece of information based on the information received by the remote control from the control means can be displayed on the display unit, and while the remote control is receiving the information, the operation unit can arbitrarily switch between displaying the message display screen on the display unit and displaying a normal screen that does not display the message display screen, When the remote control is receiving multiple pieces of information and the message display screen is to be displayed on the operation unit, one of the message display screens is displayed on the display unit, the other message display screens are not displayed until the currently displayed message display screen becomes hidden, and when the currently displayed message display screen becomes hidden, one of the other hidden message display screens is displayed on the display unit.

2. The hot water supply system according to claim 1 , wherein when a user performs a message sending operation by using the operation unit, the message display screen being displayed on the display unit is made non-displayable.

3. 3. The hot water supply system according to claim 1, wherein the message display screen being displayed on the display unit is hidden when a user does not operate the operation unit for a predetermined period of time.

4. A hot water supply system as described in claim 1 or claim 2, wherein when the message display screen currently being displayed on the display unit becomes hidden, the next message display screen to be displayed is a message display screen that has never been displayed among the message display screens currently being hidden.

5. 3. The hot water supply system according to claim 1, wherein when all of the message display screens based on the information being received by the remote controller are hidden, the normal screen is displayed on the display unit.

6. A hot water supply system as described in claim 1 or claim 2, wherein after all of the message display screens based on the information being received by the remote control are displayed once in a certain order, the display of all of the message display screens is repeated again in the certain order.

7. A hot water supply system as described in claim 1 or claim 2, wherein when a user performs a message termination operation using the operation unit, the message display screen being displayed on the display unit is made non-display, and the normal screen is displayed without displaying the next message display screen.

8. 3. The hot water supply system according to claim 1, wherein the identification information identified by the control means is displayed on the message display screen.

9. 3. The hot water supply system according to claim 1, wherein while the remote controller is receiving the information, a message indicating that the message display screen can be displayed by the operation unit is displayed on the normal screen.

10. The hot water supply system according to claim 1 or 2, wherein the message display screen to be initially displayed on the display unit is determined based on a specific rule.

11. 3. The hot water supply system according to claim 1, wherein the message display screen to be displayed next when the message display screen being displayed on the display unit becomes non-displayable is determined based on a specific rule.

12. The hot water supply system according to claim 1 or claim 2, wherein the control means sets priorities for the information, and makes it impossible to display the message display screen based on the information with a lower priority while the remote control is receiving the information with a higher priority.

13. The remote controller includes a human sensor that detects the approach of a person, The hot water supply system according to claim 1 or 2, wherein the normal screen is switched to the message display screen when the human presence sensor detects the approach of a person.

14. The hot water supply system according to claim 1 or 2, wherein the message display screen displays the number of the current message display screen among the plurality of message display screens and the total number of the plurality of message display screens.

15. 3. The hot water supply system according to claim 1, further comprising a non-display setting unit that changes a setting of any one of the plurality of message display screens so that the message display screen will not be displayed from the next time.

Images