JPH05172348A - Hot water heating device - Google Patents

Abstract

PURPOSE:To sufficiently feed water into a hot water circulation line regardless of regional difference in water pressure in a feed water line and improve the workability of a test operation by changing a reference time for deciding the completion of an initial action for feeding water into said circulation line based on the data relating to the water quantity or water pressure of the feed water line. CONSTITUTION:In a water control circuit 17 for controlling a test operation of a hot water heating device, there are provided a water solenoid valve drive unit 22 which turns on a water solenoid valve 15 when a test operation switch 18 is turned on and a feed water time measuring unit 25 which measures the feed water time required for a high water level electrode 20 to be turned on after a low water level electrode 19 is turned on at the second time. Moreover, there are provided a time decision unit 24 for setting a reference time according to the data relating to a feed water time, i.e., the water quantity in the feed water line and a holding time measuring unit 25 for measuring the time during which the electrode 19 is held in an ON state, whereby the holding time and the reference time are compared at an end decision unit 26 to turn off a circulation pump 6 when the holding time has reached the reference time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heating device which opens a water solenoid valve to start an initial water injection operation into a hot water circulation passage when a test operation switch is operated.

[0002]

2. Description of the Related Art Conventionally, a hot water heater for heating hot water and a hot water heater for heating a room by the hot water heated by the heater are provided with a circulating pump and a water tank in a hot water circulating passage connected in an annular manner. There is known a hot water type heating device having a water solenoid valve in a water supply passage for supplying tap water into a water tank. Further, in general, the above-mentioned hot water heating device is
As a trial operation to operate after installation, the tap water is replenished into the water tank and the initial water injection operation of injecting water into the hot water heater, hot water heater, circulation pump and hot water circulation path is performed, and the water stays in the hot water circulation path. I have to deflate the air.

Therefore, in Japanese Patent Laid-Open No. 3-177716, hot water provided with a water level sensor for detecting the amount of water in the water tank and a control circuit for receiving the output of the water level sensor and driving a water solenoid valve or a circulation pump. Type heating systems have been proposed. The control circuit of this hot water heating system opens the water solenoid valve to supply tap water to the water tank, closes the water solenoid valve when the water level in the water tank reaches the upper limit water level, and operates the circulation pump. Then, when the water level in the water tank drops below a predetermined water level, the water solenoid valve is opened again to supply tap water to the water tank, and a series of operations is repeated. The time is measured, and the initial water injection operation is terminated when the measured time reaches or exceeds a predetermined fixed time.

[0004]

However, since the replenishment of water into the water tank as described above is performed by direct pressure of tap water through the water solenoid valve, depending on the installation location of the hot water heating device. The water pressure is different and the amount of water injected into the hot water circulation route varies. In addition, when water is injected into the hot water circulation path after the hot water heating system is installed, the equipment placed below the connection port of the water tank in the hot water circulation path does not receive water without operating the circulation pump. Inflow. At this time, the lower the water pressure of the tap water, that is, the smaller the amount of injected water, the more air flows into the hot water circulation path together with the water, and the air accumulates in the hot water circulation path.

Therefore, as described above, when the time from the closing of the water solenoid valve to the opening of the water solenoid valve becomes equal to or longer than a predetermined fixed time, the hot water type which finishes the initial water injection operation into the hot water circulation path. In a heating system, in a low-water pressure area such as a high-rise house, the initial water injection operation ends before the air in the hot water circulation path is sufficiently exhausted, and water is not sufficiently injected into the hot water circulation path. was there. In a high water pressure area, even if water is sufficiently injected into the hot water circulation path in a shorter time than a predetermined fixed time, the initial water injection operation will not end until the fixed time elapses. However, there was a problem that the workability during the trial run was poor because it took a long time. SUMMARY OF THE INVENTION It is an object of the present invention to provide a hot water type heating device that can sufficiently inject water into the hot water circulation path regardless of the regional difference in water pressure in the water supply path and that has improved workability during test operation.

[0006]

According to the present invention, there is provided heating means for heating hot water, a radiator for heating indoor air by the hot water heated by the heating means, a water tank for supplying water from a water supply passage, and A hot water circulation path that connects a pump that circulates the hot water in the water tank to the radiator in an annular shape, a water solenoid valve that opens and closes the water supply path, and instructs an initial water injection operation into the hot water circulation path. A test operation switch and a detection unit for detecting the water level in the water tank, and when the test operation switch is operated, the pump and the water solenoid valve according to the water level in the water tank detected by the detection unit. In the hot water heating device, which comprises a control means for controlling an initial water injection operation into the hot water circulation path.
A measuring unit that measures data regarding the amount of water or water pressure in the water supply passage, a time determination unit that determines a reference time according to data regarding the amount of water or water pressure measured by the measuring unit, the pump is operating, and the water When the maintenance time in which the water level in the water tank detected by the detection unit is higher than the reference water level when the solenoid valve is closed exceeds the reference time determined by the time determination unit. The technical means having an end determination unit for ending the initial water injection operation into the warm water circulation path is adopted.

[0007]

According to the present invention, when the test operation switch is operated, the pump and the water solenoid valve are controlled according to the water level in the water tank detected by the detection unit, and water is replenished into the water tank from the water replenishing passage. The initial water injection operation into the hot water circuit is performed. Then, the time determination unit determines the reference time according to the data regarding the water amount or the water pressure measured by the measurement unit.
After that, when the pump is operated and the water solenoid valve is closed, the end determination unit maintains the maintenance time at which the water level in the water tank detected by the detection unit remains above the reference water level. When the reference time determined by the determination unit is exceeded, it is determined that it is time to finish the initial water injection operation into the hot water circulation path, and the initial water injection operation into the hot water circulation path is terminated.

Therefore, according to the present invention, the reference time for determining the completion of the initial water injection operation into the hot water circulation passage is changed according to the data regarding the water amount or the water pressure in the water supply passage. Regardless of the difference in water pressure in the water supply channel in the low water pressure area or the high water pressure area, the initial water injection operation ends after the air in the hot water circulation path has sufficiently escaped, so that sufficient water injection into the hot water circulation path is possible. .. In addition, since the initial water injection operation ends immediately when water is sufficiently injected into the hot water circulation path, no wasted time is generated during the test operation, and workability during the test operation is improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A hot water type heating device of the present invention will be described based on an embodiment shown in FIGS. FIG. 1 is a diagram showing a hot water heating device to which an embodiment of the present invention is applied. The hot water heating device 1 includes a hot water circulation passage 2, a gas burner 3, a water supply passage 4 and a control device 5. The hot water circulation path 2 sequentially connects a circulation pump 6, a heat absorber 7, a radiator 8 and a cistern 9 in an annular shape. The circulation pump 6 is energized and controlled by the control device 5, and generates a circulating flow of warm water in the warm water circulation passage 2. The heat absorber 7 heats the hot water by exchanging the heat of combustion generated in the gas burner 3 with the hot water flowing inside. The radiator 8 is provided in the hot water heater 10 arranged in each room, and heat-exchanges the hot water heated by the heat absorber 7 with the indoor air passing through the hot water heater 10 by a convection fan (not shown). To heat the room air to heat the room. The cistern 9 is the water tank of the present invention, and is supplied with tap water from the water supply path 4 and stores hot water flowing in the hot water circulation path 2.

The gas burner 3 is the heating means of the present invention. When the fuel gas is supplied from the gas supply passage 11 and burns, the hot water flowing in the heat absorber 7 is heated by the combustion heat generated by this combustion. .. The gas supply path 11 includes first and second electromagnetic valves 12 whose energization is controlled by the controller 5.
13 and a proportional control valve 14 are arranged. Water supply channel 4
Is connected to a water pipe (not shown) on the upstream side and opened / closed by a water solenoid valve 15 whose energization is controlled by the control device 5.

The control unit 5 includes first and second solenoid valves 12, 1
3 and the proportional control valve 14, a combustion control circuit 16 (see FIG. 1) for controlling energization, a circulation pump 6 and a water solenoid valve 15
And a water control circuit 17 for controlling energization. FIG. 2 is a block diagram showing the water control circuit 17 of the hot water heating system 1. The water control circuit 17 is the control means of the present invention,
It has a trial run switch 18, a low water level electrode 19 and a high water level electrode 20. The trial run switch 18 is a switch for instructing a trial run of the hot water heating system 1, that is, an initial water injection operation. The low water level electrode 19 is the detection unit of the present invention,
When the water level in the cistern 9 rises above the low water level (reference water level), it turns from off to on. In addition, the high water level electrode 20
Is a detector of the present invention, which turns from off to on when the water level in the cistern 9 rises above a high water level higher than the low water level.

Further, the water control circuit 17 includes the pump drive section 2.
1, a water electromagnetic valve drive unit 22, a makeup water time measuring unit 23, a time determining unit 24, a maintenance time measuring unit 25, an end determining unit 26, and a counter unit 27. Pump drive unit 2
1 turns on the circulation pump 6 when a heating operation switch (not shown) installed in the hot water heater 10 is turned on.
During the test run, the pump drive unit 21 is operated by the high water level electrode 2
When 0 is on, the circulation pump 6 is turned on, and when the low water level electrode 19 is off thereafter, the circulation pump 6 is turned off. Furthermore, the pump drive unit 21 turns off the circulation pump 6 when an electric signal is input from the end determination unit 26. Further, the pump drive unit 21 turns on the circulation pump 6 when an electric signal is input from the counter unit 27.

The water solenoid valve drive unit 22 includes the trial run switch 1
When the operation time (ON state) of 8 continues for a set time (for example, 0.3 seconds) T ₁ or more, the water solenoid valve 15 is turned on, and then the high water level electrode 20 is turned on.
The water solenoid valve 15 is turned off when the set time (for example, 2 seconds) timed at T _{2 is} continued. Further, the water solenoid valve drive unit 22 turns on the water solenoid valve 15 when the low water level electrode 19 is off. Further, the water solenoid valve drive unit 22 turns off the water solenoid valve 15 when an electric signal is input from the end determination unit 26. The make-up water time measuring unit 23 is a measuring unit of the present invention, and starts measuring the make-up water time when the low water level electrode 19 is turned on for the second time, and measures the make-up water time when the high water level electrode 20 is turned on. By ending the time measurement, data (replenishment water time T ₄ ) relating to the amount of tap water replenished into the cistern 9 from the water replenishment path 4 is measured.

The time determining unit 24 is a makeup water time measuring unit 23.
When the make-up water time T ₄ clocked at is equal to or shorter than ta (for example, 2 seconds), the reference time Ts is set to Ta (for example, 2 minutes). If the makeup water time T ₄ is longer than ta and is tb (for example, 3 seconds) or less, the reference time Ts is set to Tb (for example, 3 minutes). Furthermore, the make-up water time T ₄ is t
When it is longer than b, the reference time Ts is set to Tc (for example, 4 minutes). The reference time Ts is a time for operating the circulation pump 6 to remove air from the hot water circulation path 2. The maintenance time measuring unit 25 measures the set time (for example, when the circulating pump 6 is in operation (ON state) and when the water solenoid valve 15 is turned off, that is, when the high water level electrode 20 is turned on by the timer unit 28 (for example, The measurement of the maintenance time T ₃ during which the ON state of the low water level electrode 19 is maintained is started from the time T _{2 is} continued for 2 seconds.

When the maintenance time T ₃ measured by the maintenance time measurement unit 25 is equal to or longer than the reference time Ts set by the time determination unit 24, the end determination unit 26 finishes the initial water injection operation and the first air bleeding operation. The circulation pump 6
An electric signal is output to the pump drive unit 21 to turn off. The counter unit 27 reliably removes air from the hot water circulation path 2, and therefore the pump drive unit 21 and the maintenance time measuring unit 25.
And the end determination unit 26 is operated so that the number of end determinations n of the air bleeding operation including the initial water injection operation is a predetermined number (eg, 3
An electric signal is output to the pump drive unit 21 so as to turn on the circulation pump 6 at every set time (for example, 20 seconds) T ₅ measured by the timer unit 29 until the number of times reaches N. During the control, the counter unit 27 determines that the maintenance time T ₃ measured by the maintenance time measurement unit 25 is the time determination unit 24.
If the reference time Ts set in step 3 is not satisfied, the number of times n of determination of the air bleeding operation is returned to zero.

3 and 4 are flow charts showing the trial run control of the water control circuit 17 of the hot water heating system 1. First, as shown in FIG. 3, it is determined whether or not the test operation switch 18 is turned on (step S1). In this step S1, if the determination result is No,
The control of step S1 is performed. If the determination result is Yes in step S1, it is determined whether or not the set time (for example, 0.3 seconds) T ₁ has elapsed (step S2). If the determination result is No in step S2, the control of step S1 is performed. If the determination result is Yes in step S2, the water solenoid valve 15 is turned on (opened) (step S3).

Subsequently, it is determined whether or not the low water level electrode 19 is turned on (step S4). If the determination result is No in step S4, the control of step S4 is performed thereafter. When the determination result is Yes in step S4, it is determined whether or not the low water level electrode 19 is turned on for the first time (step S5). In step S5, if the determination result is Yes, the control of step S7 is performed. Further, in step S5, the determination result is N
In the case of o, the make-up water time T ₄ is reset and the timing of the make-up water time T ₄ is started (step S6).

Subsequently, it is determined whether or not the high water level electrode 20 is on (step S7). If the determination result is No in step S7, the control of step S4 is performed. If the determination result in step 7 is Yes, the measurement of the makeup water time T ₄ is finished, the makeup water time T ₄ is updated (step S8), and the circulation pump 6 is turned on (step S9). The timer section 28 starts counting time (step S10).

Subsequently, it is determined whether or not the low water level electrode 19 is turned on (step S11). In step S11, if the determination result is No, the circulation pump 6 is turned off (step S12), and the number of times n of determination of the end of the air bleeding operation is determined.
Is once or more (n ≧ 1) (step S1)
3). If the determination result is No in step S13, the control of step S3 is performed. If the determination result is Yes in step S13, the number of times n of determination of the air bleeding operation is set to 0 (n → 0) (step S14), and then the control of step S3 is performed.

If the result of determination in step S11 is Yes, it is determined whether or not the high water level electrode 20 is on (step S15). If the determination result is No in step S15, the control of step S4 is performed. Further, in step S15, the determination result is Yes.
In the case of s, it is determined whether or not the set time (for example, 2 seconds) T ₂ measured by the timer unit 28 has elapsed (step S16). If the determination result is No in step S16, the control of step S16 is performed. If the determination result is Yes in step S16, the water solenoid valve 15 is turned off (closed) (step S1).
7).

Subsequently, as shown in FIG. 4, the maintenance time T ₃ is reset to start measuring the maintenance time T ₃ of the on-state of the low water level electrode 19 (step S18), and the updated makeup water time is updated. It is determined whether T ₄ is equal to or less than ta (T ₄ ≦ ta: for example, 2 seconds) (step S19). When the determination result is Yes in this step S19, the reference time Ts is set to Ta (Ts → Ta: for example, 2 minutes) (step S20), and then the control of step S24 is performed. If the determination result is No in step S19, the updated make-up water time T ₄ is tb or less (T ₄ ≤
tb: For example, it is determined whether it is 3 seconds (step S2).
1). In this step S21, the determination result is Yes.
In the case of, the reference time Ts is set to Tb (Ts → Tb:
For example, 3 minutes) (step S22), and then the control of step S24 is performed. In step S21,
When the determination result is No, the reference time Ts Is set to Tc (Ts → Tc: for example, 4 minutes) (step S2
3).

Subsequently, it is determined whether or not the low water level electrode 19 is off (step S24). In step S24, if the determination result is Yes, the control of step S12 is performed. If the determination result is No in step S24, it is determined whether or not the on-state of the low water level electrode 19 continues for the reference time Ts. That is, it is determined whether or not the maintenance time T _{3 of} the low water level electrode 19 in the ON state is equal to or longer than the reference time Ts (T ₃ ≧ Ts) (step S2).
5). If the determination result is No in step S25, the control of step S24 is performed. If the determination result is Yes in step S25, the circulation pump 6 is turned off (step S26), and the number of times n of determination of the air bleeding operation is incremented by 1 (n → n + 1) (step S27).

Next, the number of times n of determination of the end of the air venting operation is determined.
Is a predetermined number N or less (n ≦ N: for example, twice) or not (step S28). If the determination result is Yes in step S28, the trial operation control is ended. Further, in step S28, the determination if the result is No, it is determined whether the set time (e.g. 20 seconds) T ₅ which is clocked by the timer unit 29 has elapsed (step S29). If the determination result is No in step S29, the control of step S29 is performed. If the determination result is Yes in step S29, the circulation pump 6 is turned on (step S30), and then the control of step S18 is performed. The trial run control may be terminated when the ON state of the trial run switch 18 continues for a predetermined time (for example, 0.5 seconds) or when the trial run time (for example, 20 minutes) has elapsed after the start of the trial run. The control may be ended. Further, during the trial operation control, an informing means such as a lamp for informing the trial operation control may be operated.

The operation of the hot water heating system 1 during the trial run control will be described with reference to FIGS. 1 to 5. FIG. 5 is a time chart for explaining the operation of the hot water heating device 1. The state in which the trial run switch 18 is turned on is shown in FIG.
As shown in FIG. 5, if the set time (for example, 0.3 seconds) is continued for T ₁ or more, as shown in FIG.
When 5 is turned on, the trial run control of the hot water heating system 1 is started. Therefore, the tap water is replenished into the cistern 9 from the water replenishment path 4, whereby the water level in the cistern 9 gradually increases. In addition, cistern 9
Not only this, but also the equipment installed at a position lower than the systern 9 flows through the hot water circulation path 2. When the water level in the cistern 9 exceeds the low water level,
As shown in (c), the low water level electrode 19 is turned on. Then, since tap water is further supplied into the cistern 9 from the water supply path 4, the water level in the cistern 9 further increases.

When the water level in the cistern 9 exceeds the high water level, as shown in FIG.
By turning on, as shown in FIG.
The circulation pump 6 is turned on. For this reason, the water level in the cistern 9 drops, and the water flows into the warm water circulation path 2 and into the equipment installed at a higher position than the cistern 9, so that the water inside the warm water circulation path 2 The air is removed. At the same time that the high water level electrode 20 is turned on, as shown in FIG. 5D, the timer unit 28 also starts measuring the duration of the ON state of the high water level electrode 20. At this time, as shown in FIGS. 5B and 5D, the duration of the ON state of the high water level electrode 20 is the set time (for example, 2 seconds).
When T ₂ is not reached, the water level in the cistern 9 further decreases due to the operation of the circulation pump 6, and when the water level finally falls below the low water level, the low water level electrode 19 is released as shown in FIG. While turning off, the circulation pump 6 is turned off as shown in FIG.

Even if the circulation pump 6 is turned off, FIG.
As shown in (e), the water solenoid valve 15 is still in the on (valve open) state. For this reason, tap water is still being supplied from the water supply path 4, so the
The water level inside rises. Then, when the water level in the cistern 9 exceeds the low water level, the low water level electrode 19 is turned on as shown in FIG. Then, as shown in FIG. 5L, the replenishment water time measuring unit 23 starts the operation and measures the time until the high water level electrode 20 is turned on, so that the water replenishment path 4 enters the cistern 9. Data regarding the amount of tap water to be replenished (replenishment water time T ₄ ) is measured.

Then, when the water level in the cistern 9 rises and the water level in the cistern 9 exceeds the high water level, FIG.
As shown in, the high water level electrode 20 is turned on. Then,
As shown in FIG. 5L, the circulation pump 6 is turned on again and water flows into the warm water circulation path 2. However, if water has been distributed almost in the warm water circulation path 2 due to the previous air venting, as shown in FIGS. 5C and 5D, even if the set time (for example, 2 seconds) T ₂ is exceeded, the high water level is exceeded. The ON state of the electrode 20 is continued. Therefore, when the measurement of the timer unit 28 is completed, the water solenoid valve 15 is turned off to suspend the supply of tap water to the systern 9, as shown in FIG. Then, the time determination unit 24 determines the reference time Ts.
Is the makeup water time T ₄ measured by the makeup water time measuring unit 23.
Is set to Ta (eg, 2 minutes) when is less than ta (eg, 2 seconds), and Tb (eg, 3 minutes) is longer than ta (eg, 2 seconds) and is less than tb (eg, 3 seconds).
Is set to, and when tb (for example, 3 seconds) or more is set, Tc (for example, 4 minutes) is set.

Then, as shown in FIG. 5 (g), the maintenance time measuring unit 25 keeps the temperature from the time when the circulation pump 6 is in operation (on state) and the water solenoid valve 15 is off (T ₀ ). Maintenance time T ₃ during which the water level electrode 19 is maintained in the ON state
The measurement of is started. Since the circulation pump 6 is still in operation, water is circulated in the hot water circulation passage 2 to remove air from the hot water circulation passage 2. Then, as shown in FIGS. 5F and 5G, when the maintenance time T ₃ measured by the maintenance time measurement unit 25 becomes equal to or longer than the reference time Ts set by the time determination unit 24, the end determination unit 26
Is determined to be the end time of the initial water injection operation and the end time of the first air bleeding operation, and the circulation pump 6 is turned off as shown in FIG. Furthermore, in this embodiment, as shown in FIG.
As shown in (h), the timer unit 29 measures the time until the number of times n of determination of the end of the air bleeding operation including the initial water injection operation reaches a predetermined number (for example, 3 times) N, as shown in FIG. _{5 for} each set time (for example, 20 seconds) T 5
As shown in (i), by turning on the circulation pump 6, after the air bleeding operation in the hot water circulation passage 2 is repeated, the test operation control of the hot water heating device 1 ends.

As described above, in the hot water heating system 1 of this embodiment, the reference time for determining the end time of the initial water injection operation into the hot water circulation path 2 and the air bleeding operation in the hot water circulation path 2 is set as follows. The amount can be increased or decreased according to the data regarding the amount of water in the water supply passage 4 (supply water time). As a result, even when the hot water heater 1 of this embodiment is installed in a low water pressure area such as a high-rise housing group or a high water pressure area where water pressure in the water supply passage 4 is different, the air in the hot water circulation passage 2 is Since the trial run control can be ended after the water has sufficiently escaped, a sufficient amount of water is distributed in the warm water circulation path 2. Further, when the hot water circulation path 2 is sufficiently filled with water, the end determination unit 26
Thus, the circulation pump 6 can be turned off to finish the initial water injection operation into the warm water circulation passage 2 and the air bleeding operation inside the warm water circulation passage 2, so that no time is wasted during the trial operation and Workability can be improved.

[Modification] In this embodiment, a gas burner is used as the heating means, but a burner that burns with liquid fuel, an electric heater, or the like may be used as the heating means. In the present embodiment, the replenishment water time measuring unit 23 is provided as a measuring unit to measure the data regarding the amount of water in the water replenishment path 4 (replenishment water time). Data about the amount of water or the water pressure in the supply path 4 may be measured directly or indirectly. Further, two or more water solenoid valves and pumps may be provided.

[0031]

According to the present invention, the initial water injection operation can be terminated after the air in the hot water circulation passage is sufficiently discharged, regardless of the regional difference in water pressure in the water supply passage, that is, in the low water pressure area or the high water pressure area. Therefore, water can be sufficiently injected into the hot water circulation path. Further, since the initial water injection operation can be ended immediately after the water is sufficiently injected into the hot water circulation path, no wasteful time is generated during the test operation, and the workability during the test operation can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing a hot water type heating device to which an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing a water control circuit of a hot water heating device to which an embodiment of the present invention is applied.

FIG. 3 is a flowchart showing trial run control of a water control circuit of a hot water heating apparatus to which an embodiment of the present invention is applied.

FIG. 4 is a flowchart showing trial run control of a water control circuit of a hot water heating system to which an embodiment of the present invention is applied.

FIG. 5 is a time chart for explaining the operation of the hot water heating device to which the embodiment of the present invention is applied.

[Explanation of symbols]

 1 hot water type heating device 2 hot water circulation path 3 gas burner (heating means) 4 water supply path 6 circulation pump 8 radiator 9 cistern (water tank) 15 water solenoid valve 17 water control circuit (control means) 18 trial run switch 19 low water level electrode ( Detection unit) 20 High water level electrode (Detection unit) 23 Make-up water time measurement unit (Measurement unit) 24 Hour determination unit 26 End determination unit

Claims (1)

[Claims] 1. A heating means for heating hot water, a radiator for heating indoor air with the hot water heated by the heating means, a water tank to which water is replenished from a water replenishing passage, and the heat water for radiating the hot water in the water tank. A hot water circulation path that connects a pump to circulate to the vessel in an annular shape, a water solenoid valve that opens and closes the water supply path, a trial operation switch that directs an initial water injection operation into the hot water circulation path, and the inside of the water tank Having a detection unit for detecting the water level, when the test operation switch is operated, by controlling the pump and the water solenoid valve according to the water level in the water tank detected by the detection unit, the hot water circulation In a hot-water heating device including a control unit that performs an initial water injection operation into the passage, the control unit is a measurement unit that measures data relating to the amount of water or the water pressure in the water supply passage, and is measured by this measurement unit. Water volume Alternatively, a time determination unit that determines a reference time according to data regarding water pressure, when the pump is operating and the water solenoid valve is in a closed state, the water level in the water tank detected by the detection unit is a reference. When the maintenance time for maintaining the water level or more exceeds the reference time determined by the time determination unit, the hot water is characterized by having an end determination unit for terminating the initial water injection operation into the hot water circulation path. Type heating system.