Water heater remote control

Abstract

To suppresses radio interference from external devices.SOLUTION: A water heater remote control 10 includes a remote control board 11 on which an intercom circuit 12 is mounted, a wireless communication control unit 15 that controls wireless communication, and a wireless radio wave source 16 having an antenna 17 that outputs radio waves. The wireless communication control unit 15 and the wireless radio wave source 16 are located on the front side of the remote control board 11, and the intercom circuit 12 is located on the back side of the remote control board 11. A shielding member 20 that blocks radio waves is located around at least the area of the remote control board where the wireless communication control unit and the wireless radio wave source are located and in a portion corresponding to the back side.SELECTED DRAWING: Figure 2C

Description

[Technical Field]

[0001] The present invention relates to a water heater remote control. [Background technology]

[0002] BACKGROUND ART Conventionally, there is a system in which a water heater installed outdoors is remotely controlled by a water heater remote control installed indoors, such as in a kitchen (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-97395 Summary of the Invention [Problem to be solved by the invention]

[0004] However, as will be explained below, the conventional water heater remote control described in Patent Document 1 is subject to interference from radio waves output from external devices, which may cause noise in the intercom voice between the built-in remote controls.

[0005] Below, the problems with the conventional water heater remote control will be described with reference to Fig. 8. Fig. 8 is an explanatory diagram of the problems with the conventional water heater remote control 10Old. For example, as shown in Fig. 8, the conventional water heater remote control 10Old is installed on a wall in a kitchen or the like, and an external device such as an indoor door phone 120 with an intercom function may be installed on a nearby wall above, below, left, or right of the conventional water heater remote control 10Old. In this case, the conventional water heater remote control 10Old may be subject to interference from radio waves output from the indoor door phone 120, causing noise to occur in the intercom between the built-in remote controls.

[0006] The present invention has been made to solve the above-mentioned problems, and a main object of the present invention is to provide a water heater remote control that suppresses radio wave interference from external devices. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the present invention provides a water heater remote control comprising a remote control board on which an intercom circuit is mounted, a wireless communication control unit for controlling wireless communication, and a wireless radio wave source having an antenna for outputting radio waves, wherein the wireless communication control unit and the wireless radio wave source are arranged on the front side of the remote control board, the intercom circuit is arranged on the back side of the remote control board, and a shielding material for blocking radio waves is arranged around and in a portion of the remote control board corresponding to the back side and at least the area where the wireless communication control unit and the wireless radio wave source are arranged. Other means will be described later. [Effects of the Invention]

[0008] According to the present invention, radio wave interference from external devices can be suppressed. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a configuration diagram of a water heater system including a water heater remote control according to an embodiment. [Figure 2A] FIG. 2 is a front view of the hot water heater remote control of the first embodiment. [Figure 2B] FIG. 2 is a rear view of the hot water heater remote control of the first embodiment. [Figure 2C] FIG. 2 is a side view of the hot water heater remote controller of the first embodiment. [Figure 3A] FIG. 10 is a front view of the hot water heater remote controller of the second embodiment. [Figure 3B] FIG. 10 is a rear view of the hot water heater remote controller of the second embodiment. [Figure 3C] FIG. 10 is a side view of the hot water heater remote controller of the second embodiment. [Figure 4A] FIG. 10 is a front view of a hot water heater remote controller in which a wireless communication board according to a second embodiment is disposed in the front. [Figure 4B] FIG. 10 is a rear view of the hot water heater remote controller in which the wireless communication board according to the second embodiment is disposed in the front. [Figure 4C]FIG. 10 is a side view of a water heater remote controller in which a wireless communication board according to a second embodiment is disposed in the front. [Figure 5A] FIG. 10 is a front view of a water heater remote controller according to a third embodiment. [Figure 5B] FIG. 11 is a front view of a wireless communication board (separate board) of a hot water heater remote controller of the third embodiment. [Figure 5C] FIG. 10 is a side view of the water heater remote controller of the third embodiment. [Figure 6A] FIG. 10 is a front view of a water heater remote controller according to a fourth embodiment. [Figure 6B] FIG. 10 is a rear view of the water heater remote controller of the fourth embodiment. [Figure 6C] FIG. 10 is a side view of the water heater remote controller of the fourth embodiment. [Figure 7] FIG. 10 is a configuration diagram of a water heater system according to a modified example. [Figure 8] 1 is an explanatory diagram of a problem with a conventional hot water heater remote control. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described in detail with reference to the drawings. Note that each drawing is merely a schematic illustration to allow a sufficient understanding of the present invention. Therefore, the present invention is not limited to the illustrated examples. Furthermore, in each drawing, common or similar components are given the same reference numerals, and redundant explanations thereof will be omitted.

[0011] Note that conventional hot water heater remote controls have the following problems, and the present embodiment also aims to provide a hot water heater remote control that can solve the following problems.

[0012] (1) Some conventional water heater remote controls are installed on a wall in the kitchen or elsewhere, away from external devices such as the indoor door phone 120 (FIG. 8), to prevent noise from being generated in the intercom voices between the built-in remote controls. A water heater remote control with this configuration has the problem that it must be installed with sufficient space away from external devices such as the indoor door phone 120 (FIG. 8).

[0013] (2) Some conventional water heater remote controls eliminate the need to secure sufficient wall space in a kitchen or other area by creating an opening in the wall, installing a switch box inside the opening, installing a wireless adapter for wireless connection inside the switch box, and storing the water heater remote control in the opening of the switch box. This type of water heater remote control reduces radio wave interference by controlling the device, such as by halting wireless output during an intercom call. However, this type of water heater remote control may have the following issues: If the switch box is installed arbitrarily, it is possible that it may not be installed. In this case, there may be no place to secure the wireless adapter for wireless connection, and the wireless adapter may end up hanging inside the wall. This may cause stress on the connection cord, potentially resulting in disconnection or communication errors. On the other hand, if a switch box is installed, a means of fixing the wireless adapter inside the box is required. The fixing member is adhesive tape, and the fixing position is specified, but if it is placed in an unintended position due to poor installation, the wireless adapter's radio wave strength may decrease. On the other hand, when replacing a water heater, it may be necessary to install a new switch box on the wall. Considering the issues related to the installation of the switch box, it becomes necessary to consider how to secure the wireless adapter. Depending on the installation location, there is a possibility of radio wave interference from metal components and rebar in the walls of the customer's home, floor differences, and various external devices. If the radio wave strength of the wireless adapter decreases, it may be very difficult to identify the cause.

[0014] <Configuration of a water heater system including a water heater remote control> The configuration of a water heater system 1000 including a water heater remote control 10 according to this embodiment will be described below with reference to Fig. 1. Fig. 1 is a configuration diagram of a water heater system 1000 including a water heater remote control 10 according to this embodiment.

[0015] In the example shown in FIG. 1, the water heater system 1000 includes a water heater 100, a water heater remote controller 10, a wireless router 110, a network N1, a server S1, and a smartphone 111.

[0016] The water heater 100 is a home appliance that heats water and supplies it. In this embodiment, the water heater 100 is described assuming that it is configured as a heat pump water heater that uses not only electricity but also atmospheric heat.

[0017] The water heater remote control 10 is a remote control (remote controller) that remotely operates the water heater 100. The water heater remote control 10 is mainly composed of a bathroom remote control (not shown) that is installed on the wall of the bathroom, and a kitchen remote control (not shown) that is installed on the wall of the kitchen, etc. The bathroom remote control and kitchen remote control are each provided with various dedicated buttons (not shown) (operation button, bath temperature adjustment button, and call button). The call button is a button that is pressed when users communicate with each other between the bathroom remote control and the kitchen remote control. The water heater remote control 10 has a remote control board 11, which will be described later, and a wireless communication board 14, which will be described later. Note that the wireless communication unit 14 may be a board.

[0018] The wireless router 110 is a device installed in the customer's premises that relays communications based on a predetermined communication protocol. That is, the wireless router 110 has a function of connecting a wireless communication unit 14 (described later) to the network N1.

[0019] The smartphone 111 is a terminal device carried by the customer, and performs predetermined communication with the server S1 via the network N1 or performs direct communication (e.g., Bluetooth communication) with the wireless communication unit 14 described below. In response to operations on the smartphone 111, the water heater remote control 10 may remotely operate the water heater operation, temperature adjustment, etc. Note that the water heater system 1000 may be configured to include a tablet device (not shown) or other electronic device instead of the smartphone 111.

[0020] In addition to managing data related to the water heater 100, the server S1 has the function of communicating with the smartphone 111 via the network N1, and with the wireless communication unit 14 via the network N1 and the wireless router 110 in sequence.

[0021] <Configuration of the water heater remote control> In the water heater system 1000, for example, the water heater remote control 10A of the first embodiment to the water heater remote control 10E of the fourth embodiment shown in Figures 2A to 2C can be used as the water heater remote control 10. The configurations of the water heater remote control 10A of the first embodiment to the water heater remote control 10E of the fourth embodiment will be described below with reference to Figures 2A to 2C.

[0022] (First Example) 2A to 2C are a front view, a rear view, and a side view, respectively, of the hot water heater remote controller 10A of the first embodiment.

[0023] As shown in FIGS. 2A and 2B, the hot water heater remote control 10A of the first embodiment includes a remote control board 11, a display unit 13, a wireless communication control unit 15, a wireless radio wave source 16, and a shield member 20.

[0024] The remote control board 11 is a board on which an intercom circuit 12, a display unit 13, a wireless communication control unit 15, a wireless radio wave source 16, and other components are mounted. The intercom circuit 12 is a circuit that includes a microphone and a speaker (not shown) and executes voice calls. In this embodiment, the remote control board 11 is rectangular in shape and has the display unit 13 in the upper left corner. The display unit 13 is a part that displays information related to the water heater 100. In this embodiment, the description will be given assuming that the display unit 13 is a liquid crystal display.

[0025] The wireless communication unit 14 includes a wireless communication control unit 15 and a wireless radio wave source 16 . The wireless communication control unit 15 is a component that controls wireless communication. The wireless radio wave source 16 is a component that outputs wireless radio waves. The wireless radio wave source 16 has an antenna 17 that inputs and outputs radio waves. In this embodiment, the wireless radio wave source 16 is mounted on the remote control board 11.

[0026] The shielding member 20 is a member that blocks radio waves arriving from both the inside and outside. Examples of materials that block radio waves include aluminum, copper, silver, iron, stainless steel, beryllium steel, permalloy with high magnetic permeability, rubber-based resin materials made by mixing conductive materials such as silver-plated particles of silicon-based or glass, and shielding paints made by mixing magnetic and dielectric materials. The shielding member 20 may also be a shield cover (metal shield) that shields part of an electronic component. In this embodiment, we will assume that the shielding member 20 is composed of a copper foil pattern 21, which is a type of metal foil pattern. The metal foil pattern is a planar member formed to block radio waves arriving from both the inside and outside. For example, the metal foil pattern may be formed as a solid coating (i.e., a solid coating without gaps) or a mesh pattern (a grid-like pattern) to block radio waves. While this embodiment assumes that the remote control board 11 is configured as a double-sided board, the remote control board 11 may also be configured as a multilayer board with the copper foil pattern 21 as the shielding member 20 on the inner layer. The shielding member 20 may be made of a three-dimensional metal shielding member so as to block radio waves coming from inside and outside.

[0027] 2A and 2B, in this embodiment, the wireless communication control unit 15 and the wireless radio wave source 16 are disposed on the front side of the remote control board 11, and the intercom circuit 12 is disposed on the rear (back) side of the remote control board 11. The copper foil pattern 21 is disposed around or behind at least the area of ​​the remote control board 11 where the wireless communication control unit 15 and the wireless radio wave source 16 are disposed, so as to block radio waves (see the three lines shown in FIG. 2C) coming from the inside (output from the wireless radio wave source) and the outside. In this embodiment, the copper foil pattern 21 (shielding member 20) is laid out on the same plane as the wireless communication control unit 15 and the wireless radio wave source 16 disposed on the front side of the remote control board 11, so as to surround them. The copper foil pattern 21 (shielding member 20) is formed on the rear side of the remote control board 11 so as to cover the area where the wireless communication control unit 15 and the wireless radio wave source 16 disposed on the front side are disposed.

[0028] As shown in FIG. 2C , an opening 90op is formed in a wall 90 of a kitchen or the like. The opening 90op is a hole through which a remote control cord (not shown) serving as a power line for connecting the water heater remote control 10A from the wall 90 to a power source (not shown) is inserted, and a hole of the same size is also provided in the remote control mounting plate 91. The remote control mounting plate 91 is a member that supports the water heater remote control 10A and is fixed to the wall 90 with a plurality of screws (not shown). The remote control mounting plate 91 has a remote control locking portion 92. The remote control locking portion 92 is a component that supports the back surface of the water heater remote control 10A. The remote control locking portion 92 is configured to protrude from the front side (front surface) of the remote control mounting plate 91 and supports the water heater remote control 10A from the back surface. The remote control mounting plate 91 allows the installation location of the water heater remote control 10A to be determined.

[0029] (Second Example) Figures 3A (4A) to 3C (4C) are respectively a front view, a back view, and a side view of the hot water heater remote control 10B (10C) of the second embodiment. As shown in Figures 3A (4A) to 3C (4C), the hot water heater remote control 10B (10C) of the second embodiment differs from the hot water heater remote control 10A of the first embodiment (Figures 2A to 2C) in the following points. (Difference B) The hot water heater remote controller 10B (10C) of the second embodiment has the wireless communication unit 14 arranged on a separate board. The water heater remote control 10C has an opening 11op in a remote control board 11, and inside the opening 11op, a wireless communication board 14a is provided as a separate board on which a wireless communication control unit 15 and a wireless radio wave source 16 are mounted. The wireless communication board 14a is disposed so as to be in a position substantially flush with the surface of the remote control board 11.

[0030] The differences between FIGS. 3A to 3C and FIGS. 4A to 4C are as follows. In the remote control 10C, the wireless communication board 14a, on which the wireless communication control unit 15 and the wireless radio wave source 16 are mounted on the front side, is arranged so that its surface is positioned forward of the surface of the remote control board 11. Unlike the configuration in which the wireless communication board 14a (FIGS. 4A to 4C) is arranged inside the opening 11op of the remote control board 11, the wireless communication board 14a (FIGS. 5A to 5C) is arranged without providing an opening 11op in the remote control board 11.

[0031] (Third Example) Fig. 5A is a front view of a water heater remote control 10D of the third embodiment. Fig. 5B is a rear view of the wireless communication board 14b (separate board) of the water heater remote control 10D of the third embodiment. Fig. 5C is a side view of the water heater remote control 10D. As shown in Figs. 5A to 5C, the water heater remote control 10D of the third embodiment differs from the water heater remote control 10A of the first embodiment (Figs. 2A to 2C) in the following points. (Difference D) The water heater remote control 10D of the third embodiment is equipped with a wireless communication board 14b that has a wireless radio wave source 16 and an antenna 17 mounted on the front side, and the wireless communication board 14b is positioned away from the wireless communication control unit 15 and is connected to the wireless communication control unit 15 via a cable 18. In this embodiment, the wireless communication board 14b is intended to be placed at the upper right corner of the front side of the water heater remote control 10D, but it may also be provided with multiple fixing parts (not shown) that allow it to be placed in other locations, so that when the installer installs the water heater remote control 10D in the customer's home, the wireless communication board 14b can be arbitrarily repositioned to a location where the influence of radio wave interference is minimal, depending on the location of external devices such as the indoor door phone 120 (Figure 8) that are placed nearby.

[0032] (Fourth Example) Figures 6A to 6C are a front view, a back view, and a side view, respectively, of the water heater remote control 10E of the fourth embodiment. As shown in Figures 6A to 6C, the water heater remote control 10E of the fourth embodiment differs from the water heater remote control 10C of the second embodiment (Figures 4A to 4C) in the following points. (Difference E) The water heater remote controller 10E of the fourth embodiment has a radio wave absorbing sheet 26 for absorbing radio waves on the rear side of the intercom circuit 12, and is disposed so as to be located behind the rear side of the remote control board 11. In the water heater remote control 10E, the wireless communication board 14a on which the wireless communication control unit 15 and the wireless radio wave source 16 are mounted is located behind the rear surface of the remote control board 11, and the radio wave absorbing sheet 26 is provided to cover the rear surface of the intercom circuit 12, thereby suppressing interference of radio waves output from the wireless communication board 14a. Note that although this embodiment is based on the intercom circuit 12 which is susceptible to radio wave interference, the radio wave absorbing sheet 26 may also be provided on other circuits (display, button input, communication circuit, etc.) provided on the remote control board 11.

[0033] As will be described below, the hot water heater remote control 10A of the first embodiment can solve the above-mentioned problems with conventional hot water heater remote controls. This also applies to the hot water heater remote controls 10A, 10B, 10C, 10D, and 10E of the other embodiments.

[0034] (1) Conventional water heater remote controls need to be installed away from external devices such as the indoor door phone 120 (Figure 8), but the water heater remote control 10A of the first embodiment can suppress interference with radio waves output from the indoor door phone 120. (2) With conventional water heater remote controls, when installing a wireless adapter for wireless connection, it is necessary to consider concerns about disconnection of the connection cord depending on whether or not a switch box is present, communication abnormalities, reduction in radio wave strength depending on the fixed position of the wireless adapter, and the impact of the location of the water heater remote control.However, with the water heater remote control 10A of the first embodiment, the wireless communication unit 14 is installed within the water heater remote control 10A, so there is no need to consider concerns about installing a wireless adapter.

[0035] The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of the embodiments with other configurations, and it is also possible to add other configurations to the configuration of the embodiments. Furthermore, it is possible to add, delete, or replace part of each configuration with other configurations.

[0036] For example, the water heater system can be configured as shown in Fig. 7. Fig. 7 is a configuration diagram of a modified water heater system 1000. The modified water heater system 1000 shown in Fig. 7 has water heater remote controls 10 installed in the kitchen and bathroom. Hereinafter, the water heater remote control 10 installed on the kitchen wall will be referred to as the "kitchen remote control 101A," and the water heater remote control 10 installed in the bathroom will be referred to as the "bathroom remote control 101B."

[0037] The kitchen remote control 101A and the bathroom remote control 101B are configured as any of the water heater remote controls 10A of the first embodiment to the water heater remote control 10E of the fourth embodiment shown in FIGS. 2A to 6C.

[0038] Kitchen remote control 101A has intercom circuit 12 and wireless communication control unit 15. Intercom circuit 12 has control unit 51, communication unit 52, microphone 53, amplifier unit 54, audio output unit 56, and speaker 57. Intercom circuit 12 also has FM modulation / demodulation unit 58, bandpass filter 59, and variable resistor 70.

[0039] The control unit 51 is a component that controls the overall operation of the intercom circuit 12. The communication unit 52 is a component that communicates with the outside. The microphone 53 is an input means for an audio signal. The amplifier unit 54 is a component that amplifies the audio signal input from the microphone 53. The audio output unit 56 is a component that outputs an audio signal to the speaker 57. The speaker 57 is a means for outputting an audio signal. The FM modulation / demodulation unit 58 is a component that FM modulates or demodulates an audio signal. The bandpass filter 59 is a component that blocks signals of a given frequency. The variable resistor 70 is a component that changes the resistance value of the amplifier unit 54.

[0040] Bathroom remote control 101B has an intercom circuit 60. Intercom circuit 60 has the same components as intercom circuit 12 of kitchen remote control 101A, including a control unit 61, a communication unit 62, a microphone 63, an amplifier unit 64, an audio output unit 66, and a speaker 67. Intercom circuit 60 also has an FM modulation / demodulation unit 68, a bandpass filter 69, and a variable resistor 70.

[0041] Intercom circuit 12 of kitchen remote control 101A has reception / transmission switching unit 55 that switches between reception and transmission. In addition, the intercom circuit 60 of the bathroom remote control 101B has a voice detection unit 65a that detects voice, and a switch 65b that outputs a voice signal to the voice output unit 66 when a voice signal is detected by the voice detection unit 65a.

[0042] Furthermore, the control unit 51 of the intercom circuit 12 of the kitchen remote controller 101A causes the wireless communication control unit 15 to perform predetermined communication between the terminal device such as the smartphone 111 (FIG. 1) and the server S1 via the network N1.

[0043] The water heater system 1000 also includes a kitchen remote control 101A, a bathroom remote control 101B, and a main body board 80. The main body board 80 is a board on which circuits are mounted to control a heat pump unit (not shown) that produces hot water and a hot water storage tank unit (not shown) that mixes hot water and cold water to adjust the temperature to an appropriate level. The main body board 80 is connected to the kitchen remote control 101A via a cable K1, and is also connected to the bathroom remote control 101B. The kitchen remote control 101A and the bathroom remote control 101B are also interconnected. The main body board 80 includes a control unit 81 and a communication unit 82. The control unit 81 executes a predetermined program and controls the hot water storage tank unit based on signals received from the kitchen remote control 101A and the bathroom remote control 101B via the communication unit 82.

[0044] In the modified water heater system 1000, the kitchen remote control 101A and the bathroom remote control 101B are configured as any one of the water heater remote control 10A of the first embodiment to the water heater remote control 10E of the fourth embodiment shown in FIGS. 2A to 6C. Therefore, the modified water heater system 1000 can suppress interference of radio waves from internal wireless communication and radio waves from external devices with the intercom circuit 12 by using the shielding member 20 (FIGS. 2A to 2C). Furthermore, the modified kitchen remote control 101A and the bathroom remote control 101B include amplifiers 54, 64 for microphone 53, 63 signals and a variable resistor 70. Increasing the resistance value of the variable resistor 70 amplifies the microphone 53, 63 signals. This increases the signal source relative to the generated noise, improving the S / N ratio and suppressing noise generation. Therefore, this modified example enables even greater noise suppression than the first to fourth embodiments. [Explanation of symbols]

[0045] 10, 10A, 10B, 10C, 10D, 10E, 10Old Water heater remote control (communication device for water heater) 11 Remote control board 11op opening 12 Intercom circuit 13 Display section 14. Radio Communication Section 14a, 14b Wireless communication board 15 Wireless communication control unit 16 Radio wave source 17 Antenna 18 Cable 20 Shielding material 21 Copper foil pattern (metal foil pattern) 26 Radio wave absorbing sheet 51, 61, 81 Control unit 52, 62, 82 Communications Department 53,63 Mike 54,64 Amplifier 55 Receive / transmit switch 56,66 Audio output section 57,67 speakers 58,68 FM modulation / demodulation section 59,69 Bandpass filter 60 Intercom Circuit 65a Voice detection unit 65b switch 70 Variable Resistor 80 Main board 90 Wall 90op opening 91 Remote control mounting plate 92 Remote control locking part 100 water heater 101A Kitchen Remote Control 101B Bathroom remote control 110 Wireless router (information collection device) 111 Smartphone 120 In-home door phone (intercom) 1000 water heater system N1 Network S1 Server

Claims

1. A remote control board on which an intercom circuit is implemented, a wireless communication control unit that controls wireless communication; a radio wave source having an antenna for outputting radio waves; the wireless communication control unit and the wireless radio wave source are disposed on the front side of the remote control board; the intercom circuit is disposed on the rear side of the remote control board, A water heater remote control characterized in that a shielding material that blocks radio waves is arranged around and on the back side of at least the area of ​​the remote control board where the wireless communication control unit and the wireless radio wave source are located.

2. The hot water heater remote control according to claim 1, A hot water heater remote control characterized in that the shielding member is a flat metal foil pattern formed around and behind the wireless communication control unit and the wireless radio wave source on the remote control board so as to block radio waves arriving from inside and outside.

3. The hot water heater remote control according to claim 1, A hot water heater remote control characterized in that the shielding member is a three-dimensional metal shield formed around and behind the wireless communication control unit and the wireless radio wave source on the remote control board so as to block radio waves arriving from inside and outside.

4. The hot water heater remote control according to claim 1, a separate board on which the wireless communication control unit and the wireless radio wave source are mounted, The remote controller for a hot water heater, wherein the separate board is arranged so that its surface is positioned in approximately the same plane as the surface of the remote controller board.

5. The hot water heater remote control according to claim 1, a separate board on which the wireless communication control unit, the wireless radio wave source, and the shielding member are mounted; The remote controller for a hot water heater, wherein the separate board is arranged so that its surface is positioned forward of the surface of the remote controller board.

6. A remote control board on which an intercom circuit is implemented, a wireless communication control unit that controls wireless communication; a radio wave source having an antenna for outputting radio waves; the wireless communication control unit and the wireless radio wave source are disposed on the front side of the remote control board; the intercom circuit is disposed on the rear side of the remote control board, the antenna and the wireless radio wave source are mounted on a separate board different from the remote control board and are disposed at a position separated from the wireless communication control unit, A water heater remote control characterized in that a shielding material for blocking radio waves is arranged around and on the back side of at least the area where the antenna and the radio wave source are installed on the separate board.

7. The hot water heater remote control according to claim 6, The water heater remote control is characterized in that the shielding member is a flat metal foil pattern formed around and behind the wireless communication control unit and the wireless radio wave source on the separate board so as to block radio waves arriving from inside and outside.

8. The hot water heater remote control according to claim 6, The water heater remote control is characterized in that the shielding member is a three-dimensional metal shield formed around and behind the wireless communication control unit and the wireless radio wave source on the separate board so as to block radio waves arriving from inside and outside.

9. The hot water heater remote control according to claim 1 or 6, a radio wave absorbing sheet for absorbing radio waves provided on the rear side of the intercom circuit; The hot water heater remote control, wherein the wireless communication control unit and the wireless radio wave source are arranged at a position behind the rear surface of the remote control board.

10. The hot water heater remote control according to claim 1 or 6, The water heater remote control is characterized in that the intercom circuit includes a microphone, an amplifier unit that amplifies a signal from the microphone, and a variable resistor that adjusts the signal amplification of the amplifier unit.

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