Hot water device

Abstract

To provide a technology of determining whether components depending on gas are used in a hot water device using each of plural types of gas.SOLUTION: A process executed by a hot water device comprises: a step (S710) of executing a first ignition operation (fan rotation speed: r(1), ignition determination time: t(1) (seconds)) in a first test operation mode; a step (S730) of determining that a combination of gas and adjustment components is abnormal when ignition is detected (YES in step S720); a step (S750) of executing a second ignition operation (fan rotation speed: r(2), ignition determination time: t(2) (seconds)) in a second test operation mode; a step (S780) of determining that the combination of the gas and adjustment components is normal when ignition is detected (YES in step S760); and a step (S790) of determining that the combination of the gas and adjustment components is abnormal when ignition is not detected (NO in step S760).SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present disclosure relates to a hot water device, and more specifically, to a hot water device that can use a plurality of gases as heat sources.

Background Art

[0002] Conventionally, hot water devices that can handle each of different types of gases as heat sources have been known (see, for example, Patent Documents 1 to 5).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Summary of the Invention

Problems to be Solved by the Invention

[0004] A hot water device may use components corresponding to the gas depending on the gas used as the fuel of the heat source. Since the calorific values of gases are different from each other, in order to operate the hot water device normally, it is necessary to use components corresponding to the gas. Therefore, a technique for accurately determining whether the combination of the gas and the components is correct is required.

[0005] The present disclosure has been made in view of the background as described above, and one of its objects is to provide a hot water device that can determine whether the combination of a gas and the components to be used according to the gas is correct.

Means for Solving the Problems

[0006] According to an embodiment, a hot water device capable of using each of a plurality of types of gas as fuel is provided. The calorific value of the first type of gas among the plurality of types of gas is greater than the calorific value of the second type of gas. The hot water device has an air inlet and a gas inlet, has a supply path for air and gas to a combustion chamber, a venturi in which gas is sucked in response to a negative pressure generated by the passing air, an adjustment component that is replaceably incorporated in the gas supply path and has a flow path that defines a supply amount according to the type of gas, a fan that mixes air and gas and supplies the mixed air and gas to the combustion chamber, a burner for burning the gas, an ignition unit for igniting the burner, a sensor for detecting that combustion is occurring in the combustion chamber, and a control device for operating the hot water device in a plurality of trial operation modes. In the first trial operation mode among the plurality of trial operation modes, the control device rotates the fan at a rotation speed preset to be less than the rotation speed at normal ignition, ignites the burner at the ignition unit, and when combustion is detected before a predetermined first time has elapsed since the ignition of the burner, it is determined that the combination of the gas used as fuel and the adjustment component is incorrect, assuming that the first type of gas is supplied to the combustion chamber and the adjustment component for the second type of gas is incorporated in the hot water device.

[0007] In a certain aspect, when combustion is not detected in the first trial operation mode, the control device ends the first trial operation mode and shifts to a second trial operation mode different from the first trial operation mode, rotates the fan at a rotation speed preset as the rotation speed at normal ignition, ignites the burner at the ignition unit, and when combustion is not detected before a predetermined second time has elapsed since the ignition of the burner, it is determined that the combination of the gas used as fuel and the adjustment component is incorrect, assuming that the second type of gas is supplied to the combustion chamber and the adjustment component for the first type of gas is incorporated in the hot water device, and when combustion is detected before the second time has elapsed, it is determined that the incorporation is correct.

[0008] The hot water device according to a certain embodiment can determine whether the combination of any one of a plurality of types of gas and the adjustment component is correct.

[0009] The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention understood in connection with the accompanying drawings.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0012] One combustion method used in a hot water device is the full primary air combustion method. In the full primary combustion method, the hot water device sucks in all the air required for combustion as primary air, mixes the primary air with the gas used as fuel, and sends the mixed air and gas to the combustion chamber. The gas is, for example, liquefied petroleum (LP) gas, natural gas, etc.

[0013] The hot water device 100 according to this embodiment adopts the full primary air combustion method in which combustion is performed after gas and air are completely mixed in advance. In this method, since there is less excess air compared to other methods (for example, the lean-burn combustion method), an improvement in thermal efficiency can be expected. Also, a reduction in the NOx (nitrogen oxides) emitted can be expected.

[0014] Referring to FIG. 1, the configuration of the hot water device 100 will be described. FIG. 1 is a diagram showing a part of the hardware configuration of the hot water device 100 according to this embodiment. The hot water device 100 includes a control circuit 110, a can body 136, an exhaust duct 132, an air supply unit 140, a fan 154, and an elbow 156.

[0015] The can body 136 includes a spark plug 120, a safety device 122, a valve 124, a frame rod 126, a thermistor 128, a primary heat exchanger 129, a secondary heat exchanger 130, a rectifying plate 134, and a burner 138.

[0016] The air supply section 140 includes a venturi 152, a venturi joint 160, a pressure equalizing gas valve 162, and an adjustment component 170. The venturi 152 includes an intake port 150 and a gas hole 153. The intake port 150 takes in air. The pressure equalizing gas valve 162 is connected to the gas supply pipe and maintains a constant pressure of the gas sent to the venturi joint 160. When the fan 154 rotates, air flows in from the intake port 150, and the gas used as fuel flows in from the gas hole 153 according to the negative pressure generated by the passing air. The air and gas flowing into the venturi 152 are sent to the mixing section 158 through the elbow 156. In the mixing section 158, the fan 154 mixes the air and gas. The mixed air and gas are sent to the combustion chamber 137 as a mixture for combustion.

[0017] The control circuit 110 controls the operation of the hot water device 100. The ignition plug 120 performs a spark discharge upon receiving a high voltage emitted by an igniter (not shown). When the burner 138 is ignited by the spark, the mixture supplied to the combustion chamber 137 burns. When combustion starts, the temperature of the water flowing into the primary heat exchanger 129 from outside the hot water device 100 rises.

[0018] The safety device 122 detects that the combustion by the burner 138 spreads in a direction different from the direction in which the primary heat exchanger 129 is provided, and sends a signal representing the detection to the control circuit 110. When receiving the signal, the control circuit 110 closes the valve 124 to stop the supply of the mixture.

[0019] The flame rod 126 monitors that ignition and combustion are taking place in the can body 136. The result of the monitoring is transmitted to the control circuit 110. The control circuit 110 can notify results such as combustion failure and normal operation according to the result of the monitoring.

[0020] The thermistor 128 detects the temperature of the water (hot water) supplied to the primary heat exchanger 129. The secondary heat exchanger 130 recovers latent heat from the exhaust gas after the primary heat exchange and heats the water supplied to the secondary heat exchanger 130.

[0021] The exhaust duct 132 is connected to the outside of the hot water device 100 and sends out the exhaust gas after heat exchange. The rectifying plate 134 straightens the flow of the exhaust gas and efficiently sends out the exhaust gas.

[0022] The adjusting component 170 is provided between the venturi 152 and the venturi joint 160. The venturi joint 160 is connected to a pipe provided with a pressure equalizing gas valve 162 for controlling the amount of gas to be supplied.

[0023] The adjusting component 170 is a component for adjusting the supply amount of the gas according to the characteristics of the gas supplied to the hot water device 100. In order to change the size of the gas hole 153 formed in the venturi 152, it is necessary to remake the venturi 152 itself. On the other hand, by incorporating the adjusting component 170 into the venturi joint 160, without remaking the venturi 152, substantially the same flow rate as when the size of the gas hole 153 is made to the size according to the characteristics of the gas used will be supplied according to the gas.

[0024] More specifically, the adjusting component 170 includes a hollow part through which the gas passes. The hollow part includes a throttle part. The inner diameter (orifice diameter) of the throttle part is determined according to the calorific value of the gas so that the supply amount can be restricted in the same way as the gas hole 153. Therefore, the constructor of the hot water device 100 can select an appropriate adjusting component 170 according to the type of gas used as fuel for the hot water device 100 and incorporate it between the venturi 152 and the venturi joint 160, so as to adopt a gas hole 153 having an appropriate orifice diameter without processing the venturi 152.

[0025] Here, the relationship between the characteristics of the gas used in the hot water device 100 and the adjusting component 170 will be described. The hot water device 100 can use natural gas and LP gas as fuel. The calorific value of natural gas (about 54 MJ / Nm 3 ) is smaller than the calorific value of LP gas (about 81 MJ / Nm 3 ).

[0026] Referring to FIG. 2, the configuration of the air supply section 140 will be further described. FIG. 2 is a diagram more specifically showing the configuration of the venturi 152 and the venturi joint 160 in the air supply section 140.

[0027] The venturi 152 includes a flange 202. The venturi joint 160 includes a flange 232. The adjustment component 170 includes a flange 171. The flange 232 of the venturi joint 160 is joined to the flange 202 of the venturi 152 via a seal ring 210. When the flange 232 of the venturi joint 160 and the flange 202 of the venturi 152 are joined by bolts (not shown), the adjustment component 170 functions as a gas hole 153 corresponding to the gas used as fuel.

[0028] As an example, the size (for example, orifice diameter) that defines the flow rate of the adjustment component 170 used when either natural gas or LP gas is supplied as fuel has the following relationship. · Orifice diameter of the adjustment component 170 for natural gas (about 7.9φ) > Orifice diameter of the adjustment component 170 for LP gas (about 7.7φ) Therefore, for example, when LP gas is the fuel and the adjustment component 170 having a large orifice diameter for natural gas is used, a gas with a large calorific value is supplied to the combustion chamber 137 more than necessary. As a result, incomplete combustion due to so-called gas-rich occurs in the combustion chamber 137, and carbon monoxide is abnormally generated. Thus, the hot water device 100 according to the present embodiment has a two-stage trial operation mode. In the first trial operation mode, the fan 154 operates at a rotation speed lower than the rotation speed at normal ignition, and a determination regarding LP gas is made. Then, the hot water device 100 switches to the second trial operation mode. The fan 154 operates at the rotation speed at normal ignition, and a determination regarding natural gas is made.

[0029] Referring to FIG. 3, the relationship between the volume percentage concentration of CO2 and the ignition time will be described. FIG. 3 is a diagram showing the relationship between the volume percentage concentration (vol%) of CO2 at the time of ignition and the time required for the air-fuel mixture to ignite. Region 300 represents the ignitable range. As is clear from FIG. 3, the lower the volume percentage concentration of CO2 at the time of ignition, the longer the ignition time tends to be.

[0030] Referring to FIG. 4, the relationship between the rotational speed of the fan 154 and the ignition time will be described. FIG. 4 is a diagram showing the relationship between the rotational speed of the fan 154 at the time of ignition and the time required for the air-fuel mixture to ignite. Region 400 represents the ignitable range. As is clear from FIG. 4, the lower the rotational speed of the fan 154 at the time of ignition, the longer the time required for ignition. For example, when the rotational speed is r (rpm), the ignition time is t(1) seconds. Since the fuel is gas, t(1) seconds is several seconds.

[0031] When gas is used as the fuel, if the types of gas are the same, the larger the orifice diameter of the gas supply passage, the larger the amount of gas supplied, so the gas concentration of the air-fuel mixture increases. The hot water device 100 according to the present embodiment employs a full primary air combustion method in which a spark is discharged into the air-fuel mixture for ignition. In this method, when the gas concentration increases, the number of gas molecules that undergo an oxidation reaction per unit time increases, so the ignition timing becomes earlier (that is, the time required for ignition becomes shorter). The same applies to the rotational speed of the fan 154. That is, when the fan 154 operates at a low rotational speed, the amount of the air-fuel mixture sent to the combustion chamber 137 decreases, and the number of gas molecules that react per unit time decreases. As a result, the ignition timing becomes later (that is, the time required for ignition becomes longer). The hot water device 100 according to the present embodiment uses such a relationship to determine whether the combination of the gas used as the fuel and the adjustment component 170 is correct or incorrect.

[0032] Therefore, with reference to FIG. 5, the difference in the ignitable range due to the adjustment component will be described. FIG. 5 is a diagram showing the relationship between the rotational speed of the fan 154 for the same gas and the time required for the air-fuel mixture to ignite. Region 500 represents the difference in the ignitable range. Line 510 defines the ignitable range when the adjustment component is for LP gas. Line 520 defines the ignitable range when the adjustment component is for natural gas. Therefore, region 500 represents the difference between these ignitable ranges.

[0033] That is, in the case of the same gas, since the orifice diameter of the adjustment component 170 for LP gas is different from the orifice diameter of the adjustment component 170 for natural gas, the rotational speed at which ignition starts (ignitable rotational speed) is also different. More specifically, considering the difference in the calorific value of each gas, the orifice diameter of the adjustment component 170 for LP gas is smaller than the orifice diameter of the adjustment component 170 for natural gas. Therefore, within this range of ignitable rotational speeds, the hot water device 100 can determine whether the combination of the gas type and the adjustment component 170 is correct or incorrect using a trial operation mode for ignition.

[0034] In another aspect, the hot water device 100 can change the time for determining the presence or absence of ignition according to the trial operation mode. The shorter this time, the wider the difference in the ignitable rotational speed due to the adjustment component 170, so the hot water device 100 can determine whether the combination is correct with high accuracy.

[0035] When natural gas is used as fuel, a user (for example, an installer of the water heater 100) can identify whether the adjustment component 170 corresponding to the type of gas is being used by rotating the fan 154 at the rotation speed during normal ignition to perform the ignition operation of the water heater 100. That is, in view of the fact that the calorific value of natural gas is less than that of LP gas, the orifice diameter of the adjustment component 170 for natural gas is larger than the orifice diameter of the adjustment component 170 for LP gas. Therefore, when natural gas is the fuel and ignition is carried out when the fan 154 is operating at the rotation speed during normal ignition, it means that the adjustment component 170 having a larger orifice diameter, that is, the adjustment component 170 for natural gas, is being used, so the combination of the gas and the adjustment component 170 is correct. On the other hand, when natural gas is the fuel and ignition is not carried out when the fan 154 is operating at the rotation speed during normal ignition, it means that the required amount of gas is not being supplied, and an adjustment component 170 with a smaller orifice diameter, that is, the adjustment component 170 for LP gas, is being used by mistake. When natural gas is used as fuel, in this way, it is possible to identify whether the predetermined adjustment component 170 is being used correctly.

[0036] [Determination Process] Referring to FIG. 6, the determination process by the water heater 100 will be described. FIG. 6 is a diagram showing an overview of a process for determining whether an adjustment component 170 corresponding to the type of gas is attached to the venturi 152 in the water heater 100. The process shown in FIG. 6 is executed when the operation mode of the water heater 100 is the test operation mode. In the present embodiment, the test operation mode may include a plurality of modes. The plurality of modes will be described below as the first test operation mode and the second test operation mode.

[0037] In step S610, when the control circuit 110 detects an instruction to start the test run, it starts the first test run mode. The instruction to start the test run is detected by pressing a physical switch (not shown) that the hot water device 100 has, or by inputting a control code representing the test run instruction. The control circuit 110 rotates the fan 154 at a low rotation speed (for example, r(1) rpm in FIG. 5) preset to be lower than the normal rotation speed, supplies the air-fuel mixture to the combustion chamber 137, and starts the ignition operation.

[0038] After the ignition operation is started, the gas may or may not ignite within a predetermined time. For example, in a certain situation, when the combination of the type of gas used as fuel and the adjustment component 170 is normal, since the fan 154 is rotating at a rotation speed lower than the rotation speed required for gas ignition, the gas does not ignite (step S620). In another situation, when natural gas is used as fuel and the adjustment component 170 for LP gas is used in the venturi 152, since the orifice diameter of the adjustment component 170 for LP gas is smaller than the orifice diameter of the adjustment component 170 for natural gas, the fuel required for combustion is not supplied, and the gas does not ignite (step S630).

[0039] On the other hand, when LP gas is used as fuel and the adjustment component 170 for natural gas is incorporated in the hot water device 100, since the orifice diameter of the adjustment component 170 for natural gas is larger than the orifice diameter of the adjustment component 170 for LP gas, the fuel required for ignition is supplied, and the gas ignites (step S670). In this case, since the incorrect adjustment component 170 (that is, the adjustment component 170 for natural gas) instead of the adjustment component 170 required for the gas (LP gas) used is incorporated in the venturi 152, the control circuit 110 determines that the combination of the gas and the adjustment component 170 is abnormal (step S680).

[0040] If the gas does not ignite (step S620 or step S630), the control circuit 110 switches the operation mode of the hot water device 100 to the second test operation mode (step S640). In the second test operation mode, the control circuit 110 rotates the fan 154 at a rotation speed (r(2) rpm) preset as the number of rotations to be made during normal operation of the hot water device 100, and supplies the air-fuel mixture to the combustion chamber 137. In this case, r(1) < r(2).

[0041] If the combination of the type of gas used and the adjustment component 170 for that gas is correct, the gas ignites (step S650). Therefore, the control circuit 110 determines that the combination of the gas and the adjustment component 170 is correct (normal determination, step S670).

[0042] On the other hand, if the gas does not ignite (step S660), since the wrong adjustment component 170 (i.e., the adjustment component 170 for LP gas) instead of the adjustment component 170 required for the natural gas used is incorporated in the venturi 152, the control circuit 110 determines that the combination of the gas and the adjustment component 170 is incorrect (abnormal determination, step S680).

[0043] [Control Structure] Referring to FIG. 7, the control structure of the hot water device 100 will be described. FIG. 7 is a flowchart showing a part of the processing executed by the control circuit 110 of the hot water device 100.

[0044] In step S710, the control circuit 110 switches the operation mode of the hot water device 100 to the first test operation mode, and executes the first ignition operation under predetermined first operation conditions. More specifically, the control circuit 110 turns on an igniter (not shown) to enable ignition by the spark plug 120, opens the gas valve, and starts the supply of gas. At this time, the control circuit 110 sets the rotation speed of the fan 154 to r(1) (rpm), and determines the presence or absence of ignition with a threshold time (t(1) (seconds)) preset as the ignition determination time.

[0045] In step S720, the control circuit 110 determines whether combustion is occurring. More specifically, the control circuit 110 determines whether the frame rod 126 is on. When the control circuit 110 determines that the frame rod 126 is on (YES in step S720), it switches the control to step S730. Otherwise (NO in step S720), the control circuit 110 switches the control to step S740.

[0046] In step S730, the control circuit 110 determines that the combination of the gas used as fuel and the adjustment component 170 is abnormal (incorrect) (step S670 in FIG. 6), and ends the first test operation mode. Further, the control circuit 110 executes an error report notifying that the combination is abnormal (step S680 in FIG. 6). Thereafter, the control circuit 110 ends the operation of the hot water device 100.

[0047] In step S740, the control circuit 110 scavenges the combustion chamber 137 and discharges air from the combustion chamber 137.

[0048] In step S750, the control circuit 110 switches the operation mode of the hot water device 100 to the second test operation mode and executes a second ignition operation under predetermined second operation conditions. More specifically, the control circuit 110 turns on the igniter to enable ignition by the spark plug 120 and opens the gas valve. At this time, the control circuit 110 sets the rotation speed of the fan 154 to r(2) (rpm) and determines the presence or absence of ignition with a threshold time (t(2) (seconds)) predetermined as the ignition determination time. Here, r(1) < r(2) and t(1) ≥ t(2).

[0049] In step S760, the control circuit 110 determines whether combustion is occurring. More specifically, the control circuit 110 determines whether the frame rod 126 is on. When the control circuit 110 determines that the frame rod 126 is on (YES in step S760), it switches the control to step S770. Otherwise (NO in step S760), the control circuit 110 switches the control to step S790.

[0050] In step S770, the control circuit 110 scavenges the combustion chamber 137 and discharges air from the combustion chamber 137.

[0051] In step S780, the control circuit 110 determines that the combination of the gas used and the adjustment component 170 is normal, outputs a determination result indicating that the combination is correct, and ends the second test operation mode.

[0052] In step S790, the control circuit 110 determines that the combination of the gas used and the adjustment component 170 is abnormal (step S660 in FIG. 6), outputs a determination result indicating that the combination is incorrect, and ends the second test operation mode. Further, the control circuit 110 executes an error reporting notifying that the combination is incorrect (step S680 in FIG. 6). Thereafter, the control circuit 110 ends the operation of the hot water device 100.

[0053] That is, in the first test operation mode, the control circuit 110 performs an ignition operation with the fan 154 rotating at a rotational speed (r(1)) less than a predetermined rotational speed. When the air-fuel mixture ignites, it detects that the combination of the gas and the adjustment component 170 is incorrect (the adjustment component 170 for natural gas is adopted for LP gas), and outputs a determination result indicating that. On the other hand, when the air-fuel mixture does not ignite in this ignition operation, the control circuit 110 shifts to the second test operation mode.

[0054] In the second test operation mode, the control circuit 110 performs an ignition operation with the fan 154 rotating at a normal rotational speed. If ignition does not occur, the control circuit 110 detects that the combination of the fuel and the adjustment component 170 is incorrect (the adjustment component 170 for LP gas is adopted for natural gas), determines that the combination is abnormal, and outputs the determination result. On the other hand, if the air-fuel mixture ignites during this ignition operation, the control circuit 110 determines that the combination of the gas and the adjustment component 170 is correct, outputs a determination result indicating this, and ends the second test operation mode.

[0055] When the control circuit 110 determines that the combination is incorrect, it issues an error report and performs operations such as displaying a message, outputting a sound, or lighting an indicator to prompt confirmation of the adjustment component 170. In this case, the operation mode of the hot water device 100 remains in the test operation mode. On the other hand, when the control circuit 110 determines that the combination is correct, it gives a notification indicating this and ends the test operation mode of the hot water device 100.

[0056] As described above, the hot water device 100 according to the present embodiment determines whether the combination of the gas and the adjustment component 170 is correct only based on the rotational speed at the time of ignition, so that this determination can be realized without complicating the configuration of the hot water device 100. Since the hot water device 100 determines whether the combination of the gas type and the adjustment component 170 is correct within several seconds of determining the presence or absence of ignition, it is possible to make a determination in a short time. In addition, since the fan 154 operates at a low rotational speed, it is less likely to be affected by so-called flashback ignition in which gas accumulates and ignites due to ignition delay. Therefore, this determination can be realized without causing anxiety to the installer or end user of the hot water device 100.

[0057] It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Reference Numerals

[0058] 100 Hot water device, 110 Control circuit, 120 Ignition plug, 122 Safety device, 124 Valve, 126 Frame rod, 128 Thermistor, 129 Primary heat exchanger, 130 Secondary heat exchanger, 132 Exhaust duct, 134 Rectifying plate, 136 Cylinder body, 137 Combustion chamber, 138 Burner, 140 Air supply section, 150 Air intake, 152 Venturi, 153 Gas hole, 154 Fan, 156 Elbow, 158 Mixing section, 160 Venturi joint, 162 Pressure equalizing gas valve, 170 Adjusting parts, 171, 202, 232 Flange, 210 Seal ring.

Claims

1. A hot water device capable of using each of a plurality of types of gas as fuel, wherein the calorific value of the first type of gas among the plurality of types of gas is greater than the calorific value of the second type of gas, and the hot water device includes: an air inlet and a gas inlet, a supply path for air and gas to a combustion chamber, and a venturi in which gas is sucked in response to a negative pressure generated by the passing air; an adjustment component that is replaceably incorporated in the gas supply path and has a flow path that defines a supply amount according to the type of gas; a fan that mixes air and gas and supplies the mixed air and gas to the combustion chamber; a burner for burning gas; an ignition unit for igniting the burner; a sensor for detecting that combustion is taking place in the combustion chamber; and a control device for operating the hot water device in a plurality of trial operation modes, wherein the control device: in a first trial operation mode among the plurality of trial operation modes, rotates the fan at a rotation speed preset to be less than the rotation speed at normal ignition; causes the ignition unit to ignite the burner; when combustion is detected before a predetermined first time has elapsed since the ignition of the burner, determines that the combination of the gas used as fuel and the adjustment component is incorrect, assuming that the first type of gas is being supplied to the combustion chamber and the adjustment component for the second type of gas is incorporated in the hot water device. A hot water device.

2. The control device: when combustion is not detected in the first trial operation mode, ends the first trial operation mode and shifts to a second trial operation mode different from the first trial operation mode; rotates the fan at a rotation speed preset as the rotation speed at normal ignition; causes the ignition unit to ignite the burner; when combustion is not detected before a predetermined second time has elapsed since the ignition of the burner, determines that the combination of the gas used as fuel and the adjustment component is incorrect, assuming that the second type of gas is being supplied to the combustion chamber and the adjustment component for the first type of gas is incorporated in the hot water device; when combustion is detected before the second time has elapsed, determines that the incorporation is correct. The hot water device according to claim 1.

3. The first type of gas is liquefied petroleum gas, and the second type of gas is natural gas. The hot water device according to claim 1 or 2.

4. The hot water device according to claim 1 or 2, further comprising notification means for notifying the result of any of the above determinations.

5. The notification means is a display device or a speaker provided in the hot water device, or a remote controller capable of wireless communication with the hot water device, or a transmitter that transmits a signal representing the result of the notification to an information communication terminal capable of wireless communication with the hot water device. The hot water device according to claim 4.

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