JP2008185301A - Water heater - Google Patents

Abstract

An object of the present invention is to reduce the size, weight, and efficiency of a hot water supply apparatus that performs hot water supply, heating, and bath with a single heat source, and to improve hot water supply temperature performance.
Water supplied from a water supply channel 1 is heated by combustion of a burner 2 and supplied to a hot water supply channel via a latent heat recovery heat exchanger 20 and a hot water supply heat exchanger 19, and via a hot water supply circulation pump 5. Then, it is returned again to the hot water supply heat exchanger 19 to form the hot water supply circulation circuit 6, and the hot water supply circulation circuit 6 is provided with use side heat exchangers 3 and 4 to form a circuit for supplying heat to the load side. In addition, a hot water supply device of a single can multi-channel that branches from the hot water supply circulation circuit 6 via the use side heat exchangers 3 and 4 to form a hot water supply circuit 3 for currant 10 or bath pouring, The hot water supply circulation pump 5 is rotated during simultaneous use of the use side heat exchanger to improve hot water temperature performance during simultaneous use.
[Selection] Figure 1

Description

  The present invention relates to a hot water supply device for a single can multi-channel that circulates hot water supplied through a hot water supply heat exchanger heated by combustion heat of a burner and supplies heat to a plurality of loads.

Conventionally, as this type of combustion apparatus, as disclosed in Patent Document 1, a hot water supply heat exchanger that heats water supplied through a water supply path by combustion of a burner to supply hot water to the hot water supply path, and heating supplied through an inlet path A hot water supply apparatus provided with a fluid heat exchanger that heats a target fluid by combustion of the burner and flows out to an outlet, and the hot water heat exchanger recovers sensible heat of combustion exhaust gas of the burner A sensible heat exchange unit for hot water supply, and a latent heat heat exchange unit for hot water supply that is disposed downstream of the sensible heat exchange unit for hot water supply in the flow direction of the combustion exhaust gas of the burner and recovers the latent heat of the combustion exhaust gas of the burner The fluid heat exchanger recovers sensible heat of the combustion exhaust gas of the burner, and the combustion exhaust gas of the burner than the fluid sensible heat exchange unit. Arranged downstream of the flow direction of And a fluid latent heat exchange part for recovering the latent heat of the combustion exhaust gas of the burner, and the sensible heat exchange part for hot water supply and the sensible heat exchange part for fluid are integrated in a state of conducting heat to each other. In addition, a hot water supply apparatus is disclosed which is integrally formed in a state in which the hot water latent heat exchange unit and the fluid latent heat exchange unit conduct heat with each other (see, for example, Patent Document 1).
JP 2002-267262 A

  However, since the conventional hot water supply apparatus forms two paths for hot water supply and fluid as the paths heated by the burner, the piping configuration becomes complicated and the heat exchange on the shutdown side during single operation It had the subject that the boiling of the residual water in a container generate | occur | produced.

  In addition, a hot water supply heat exchanger and a fluid heat exchanger are respectively disposed in the burner combustion gas outflow path, and the hot water supply heat exchanger is provided with a sensible heat exchange unit for hot water supply and a latent heat exchange unit for hot water supply. The fluid heat exchanger is provided with a sensible heat exchange section for fluid and a latent heat exchange section for fluid, so that the sensible heat exchange section and the latent heat exchange section respectively have a hot water supply heat exchanger and a fluid It is necessary to integrally form the heat exchanger, and the heat exchanger for hot water supply and the heat exchanger for fluid are forced to have extremely complicated configurations.

  In particular, when the structure of the latent heat exchange section is a double pipe structure using a stainless steel pipe and a copper pipe in order to improve the corrosion resistance, there is a problem in workability.

  Furthermore, although not disclosed in the above conventional example, the incoming water is heated by a burner, and the hot water is used as it is for hot water supply, or is heated in a circulating manner, thereby using the circulating water to generate heat in a plurality of utilization circuits. In a configuration that supplies hot water, when the use of hot water and the use of heat in the use circuit are performed at the same time, the hot water temperature is low downstream of the use circuit when the use of hot water is low and the use of heat in the use circuit is large. It had the subject that it will fall and it will become impossible to ensure a required hot-water supply temperature.

The present invention solves the above-mentioned conventional problems, and forms one heating path with a hot water supply heat exchanger and a latent heat recovery heat exchanger, and uses circulating water in the heating path to form a heating circuit or a bath circuit. By adopting a structure for supplying heat, it is possible to configure a use-side heat exchanger that is not related to the heat exchanger for hot water supply and the latent heat recovery heat exchanger. It is possible to provide a hot water supply device that is easy to use and prioritizes hot water supply performance by realizing a reduction in weight and weight and making the heating path mainly a hot water supply circuit. It is another object of the present invention to provide a hot water supply apparatus that improves hot water temperature performance when hot water supply and a utilization circuit are used simultaneously in one heating path configuration mainly including a hot water supply circuit.

  In order to solve the above-mentioned conventional problems, the hot water supply apparatus of the present invention heats the water supplied from the water supply passage by combustion of the burner and supplies the water to the hot water supply passage through the latent heat recovery heat exchanger and the hot water supply heat exchanger. In addition, a hot water supply circulation circuit is formed by returning it to the hot water supply heat exchanger again through a hot water supply circulation pump, and a circuit for supplying heat to the load side by disposing a use side heat exchanger in the hot water supply circulation circuit. And a hot water supply device for a single can multi-channel that branches off from the hot water supply circulation circuit via the use side heat exchanger to form a hot water supply circuit for currant or bath pouring, comprising: a use side heat exchanger; When hot water is being used at the same time, the hot water circulation pump is rotated at a predetermined rotational speed.

  Thereby, one heating path is formed by the heat exchanger for hot water supply and the heat exchanger for latent heat recovery, and the heat amount is supplied to the heating circuit and the bath circuit using the circulating water of the heating path. Enables the configuration of the use side heat exchanger that is not related to the hot water supply heat exchanger or the latent heat recovery heat exchanger. An easy-to-use hot water supply apparatus that prioritizes hot water supply performance can be provided by using a hot water supply circuit as a main route.

  In addition, when the use-side heat exchanger and hot water are used at the same time, the hot water circulation pump is rotated at a certain number of rotations, and even if the amount of hot water used is small, a certain amount of use-side heat exchanger passage flow is ensured by circulation. The hot water temperature can be prevented from greatly decreasing even if the usage-side heat exchanger uses a large amount of heat, so that the necessary hot water supply temperature can be ensured.

  The hot water supply apparatus of the present invention is configured to form one heating path with a hot water supply heat exchanger and a latent heat recovery heat exchanger, and to supply heat to a heating circuit or a bath circuit using circulating water in the heating path. This makes it possible to configure the heat exchanger on the use side that is not related to the heat exchanger for hot water supply or the latent heat recovery heat exchanger, and realizes downsizing and weight reduction of equipment by simplifying the main body configuration including the piping configuration. In addition, it is possible to provide an easy-to-use hot water supply apparatus that prioritizes hot water supply performance by making the heating path mainly a hot water supply circuit, and is also necessary when the use-side heat exchanger and hot water supply are used at the same time. Hot water at a hot water supply temperature can be supplied.

  1st invention heats the water supplied from a water supply path by combustion of a burner, supplies it to a hot water supply path via a heat exchanger for latent heat recovery and a heat exchanger for hot water supply, and again through the hot water circulation pump A hot water supply circulation circuit is formed by returning to the hot water supply heat exchanger, and a use side heat exchanger is provided in the hot water supply circulation circuit to form a circuit for supplying heat to the load side, and the use side heat exchanger A hot water supply device for a single can multi-channel that branches from a hot water supply circulation circuit that passes through and forms a hot water supply circuit for currant or bath pouring, and when the use-side heat exchanger and hot water supply are used simultaneously, The hot water supply circulation pump is rotated at a predetermined rotational speed.

Thereby, one heating path is formed by the heat exchanger for hot water supply and the heat exchanger for latent heat recovery, and the heat amount is supplied to the heating circuit and the bath circuit using the circulating water of the heating path. Enables the configuration of the use side heat exchanger that is not related to the hot water supply heat exchanger or the latent heat recovery heat exchanger. An easy-to-use hot water supply apparatus that prioritizes hot water supply performance can be provided by using a hot water supply circuit as a main route.

  In addition, when the use-side heat exchanger and hot water are used at the same time, the hot water circulation pump is rotated at a certain number of rotations, and even if the amount of hot water used is small, a certain amount of use-side heat exchanger passage flow is ensured by circulation. The hot water temperature can be prevented from greatly decreasing even if the usage-side heat exchanger uses a large amount of heat, so that the necessary hot water supply temperature can be ensured.

  In the second invention, in particular, in the first invention, when the use side heat exchanger and the hot water supply are used at the same time, the number of rotations for rotating the hot water supply circulation pump is varied or stopped depending on the amount of hot water used. Regardless of the amount of hot water used, the flow rate through the user-side heat exchanger can be made approximately constant. The temperature can be secured.

  According to a third aspect of the invention, in particular, in the first aspect of the invention, a flow rate sensor is provided in the hot water supply circulation circuit until it branches to the hot water supply circuit after passing through the use side heat exchanger, and the use side heat exchanger and the hot water supply are used simultaneously. The number of rotations of the hot water supply circulation pump is varied or stopped so that the detected flow rate of the flow rate sensor is equal to or higher than a predetermined value. Regardless of this, the flow rate through the use-side heat exchanger can be surely made a certain amount or more, so that the required hot water supply temperature can be reliably ensured without waste even if the use-side heat exchanger uses a large amount of heat.

  According to a fourth aspect of the invention, in particular, in the first aspect of the invention, a temperature sensor is provided in a hot water supply circulation circuit until branching to a hot water supply circuit after passing through the use side heat exchanger, and the use side heat exchanger and the hot water supply are used simultaneously. The rotation speed of the hot water supply circulation pump is varied or stopped so that the temperature detected by the temperature sensor is equal to or higher than a predetermined value. Regardless of the amount of heat used by the side heat exchanger, the hot water temperature after passing through the use side heat exchanger can be made a certain temperature or higher, so that the necessary hot water supply temperature can be ensured without waste.

  In the fifth aspect of the invention, in particular, in the first aspect of the invention, a temperature sensor is provided in the hot water supply circulation circuit until it branches to the hot water supply circuit after passing through the use side heat exchanger, and the use side heat exchanger and the hot water supply are used simultaneously. The temperature of the hot water supply circulation pump is varied or stopped so that the detected temperature of the temperature sensor is equal to or higher than the required hot water temperature set by the remote control device. Yes, regardless of the amount of hot water used and the amount of heat used by the user-side heat exchanger, the hot water temperature after passing through the user-side heat exchanger can be higher than the required hot water temperature. Can be secured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
In FIG. 1, first, water supplied from a water supply channel 1 is heated by combustion of a burner 2 to rise to a predetermined temperature, and then supplied to a hot water supply channel, and a heating heat exchanger 3 that is a use side heat exchanger and a bath. After passing through the primary path of the heat exchanger 4 for heat, the hot water supply circulation circuit 6 is joined again through the hot water supply circulation pump 5 to form the hot water supply circulation circuit 6.

  Then, a hot water supply path 7 is formed by branching from the hot water supply circulation circuit 6 after passing through the heat exchanger 3 for heating and the heat exchanger 4 for bath, and a bypass formed by connecting the hot water supply path 7 and the water supply path 1 to each other. A part of the water supplied from the water supply path 1 from the passage 8 is supplied via the bypass control valve 9 to be adjusted to a desired hot water and discharged from the hot water tap 10.

  Here, the burner 2 is supplied with fuel from a gas supply path 14 in which a gas source solenoid valve 11, a gas proportional valve 12, and a gas switching valve 13 are disposed, and combustion air is supplied from a combustion fan 15 in advance. A combustion operation is performed according to a predetermined sequence.

  The combustion gas generated by the combustion of the burner 2 passes through the combustion chamber 16, passes through the exhaust passage 17, and is discharged out of the instrument from the exhaust port 18.

  A hot water supply heat exchanger 19 that recovers sensible heat of the combustion gas and a latent heat recovery heat exchanger 20 that recovers the latent heat of the combustion exhaust gas are disposed in the exhaust path of the combustion gas.

  Specifically, a hot water supply heat exchanger 19 is provided in the downstream combustion chamber 16 of the burner 2, a latent heat recovery heat exchanger 20 is provided in the downstream exhaust passage 17, and water supplied from the water supply passage 1 is supplied. First, after supplying the latent heat recovery heat exchanger 20 to recover the latent heat in the combustion exhaust gas, the latent heat is supplied to the hot water supply heat exchanger 19, heated to a predetermined high temperature water by the burner 2, and supplied to the hot water supply path 7. To do.

  In this way, in addition to heat recovery by the hot water supply heat exchanger 19, by providing the latent heat recovery heat exchanger 20 for recovering the latent heat of the combustion exhaust gas, the overall thermal efficiency is increased and energy saving is achieved.

  The heating circuit 21 is connected to a load such as a radiator 22 on the secondary side of the heating heat exchanger 3 to form a closed circuit and is circulated by the heating circulation pump 23, thereby the heating heat exchanger 3. Thus, heat is exchanged with the high-temperature water supplied from the hot water supply circulation circuit 6 so as to secure the amount of heating heat.

  The bath circuit 24 supplies the hot water in the bathtub 27 to the bath heat exchanger 4 through the bath circulation pump 25 and the water amount detection unit 26 and circulates it for a predetermined time, whereby the bath heat exchanger 4 uses the hot water circulation circuit. Heat is exchanged with the high-temperature water supplied from 6, and the bath water is replenished.

  Further, as the pouring circuit 28 for filling the bathtub 27 with water, a path is formed that branches from the hot water supply path 7 on the downstream side of the bypass passage 8 and communicates with the bath circuit 24 via the pouring open / close valve 29.

  About the combustion apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, at the time of hot water supply operation, when the hot water tap 10 is opened, the water supply side flow rate sensor 30 provided in the water supply passage 1 and the hot water supply flow rate sensor 31 provided in the hot water supply circulation circuit 6 detect water flow, and this water flow signal is used for combustion. The fan 15 operates, and at the same time, the gas source solenoid valve 11 and the gas proportional valve 12 are opened, fuel and combustion air are supplied to the burner 2, and combustion is started by an ignition operation.

  Combustion gas generated by the start of combustion of the burner 2 is discharged from the exhaust port 18 via the exhaust passage 17 from the combustion chamber 16. In the course of the exhaust operation of the combustion gas, the water supplied from the water supply path 1 is heated by the hot water supply heat exchanger 19 disposed in the combustion chamber 16 and the latent heat recovery heat exchanger 20 disposed in the exhaust passage 17. .

  The hot water heated by the hot water supply heat exchanger 19 passes through the bypass passage 8 provided in communication between the hot water supply path 1 and the hot water supply path 3 so as to bypass the hot water supply heat exchanger 19 and the latent heat recovery heat exchanger 20. The bypass control valve 9 provided is mixed with water on the incoming side.

  The mixed hot water is adjusted by the signal from the hot water thermistor 33 so that the hot water set temperature set by the remote control remote control 32 is adjusted, and the hot water is supplied from the hot water tap 10 through the hot water connection port 34.

Thus, when performing a hot water supply operation, the hot water set automatically can be secured by setting a desired temperature with the remote control remote controller 32 and opening the hot water tap 10.

  During the heating operation, the heating circulation pump 23 provided in the heating circuit 21 is driven by the operation command of the radiator 22, and the hot water supply circulation pump 5 that circulates the hot water in the hot water supply circulation circuit 6 is driven in conjunction with the operation command of the radiator 22. The hot water heated by the hot water supply heat exchanger 19 that ignites the burner 2 when the water flow is detected and collects the burned heat is exchanged by the heating heat exchanger 3 and transferred to the heating circuit 21. It is. Heat of the heating circuit 21 received by the heating heat exchanger 3 is radiated as warm air by the radiator 22.

  In the bath operation, when the bath circulation pump 25 provided in the bath circuit 24 is driven by the operation command of the remote control remote controller 32 and the circulation is detected by the water flow detector 36, the hot water supply circulation circuit 6 is interlocked. The hot water circulating pump 5 that circulates the hot water is driven and the hot water flow rate sensor 35 detects water flow, so that the burner 2 is ignited, and the hot water heated by the hot water heat exchanger 19 that collects the burned heat is a bath. Heat is exchanged by the heat exchanger 4 for heat transfer to the bath circuit 24. The heat of the bath circuit 24 received by the bath heat exchanger 4 is circulated to the bathtub 27 and reheated.

  In addition, during simultaneous heating and bath operation, pumps 23 and 25 of the heating circuit 21 and the bath circuit 24 are driven by operating commands from the radiator 22 and the remote control remote control 32, and the hot water in the hot water supply circulation circuit 6 is linked in conjunction. When the hot water supply circulation pump 5 to be circulated is driven and the hot water supply flow rate sensor 35 detects water flow, combustion is started by the ignition operation of the burner 2.

  By this combustion, the circulating water in the hot water supply circuit 6 is heated by the latent heat recovery heat exchanger 20 and the hot water heat exchanger 19 and circulates while maintaining a predetermined high-temperature water state. This high-temperature circulating water is supplied to the heating heat exchanger 3 and the bath heat exchanger 4 at substantially the same temperature, and is transferred to the heating circuit 21 and the bath circuit 24.

  Further, during simultaneous operation of hot water supply and heating, the heating circulation pump 23 provided in the heating circuit 21 is driven, and the hot water supply circulation pump 15 that circulates the hot water in the hot water supply circulation circuit 6 has a predetermined number of revolutions (compared to that when heating alone). Rotation speed).

  For hot water supply, hot water after passing through the heat exchanger 3 for heating is mixed with water on the inflow side by a bypass control valve 9 disposed in the bypass passage 8, and a hot water supply thermistor 33 is set to a hot water supply set temperature set by the remote control remote control 32. , The opening degree of the bypass control valve 9 is adjusted, and hot water is discharged from the hot water tap 10 through the hot water supply connection port 34.

  If hot water supply is used, the hot water circulation pump 5 will not be empty without rotating. However, by rotating the hot water supply circulation pump 5, even if the amount of hot water used is small, it will be used for heating to a certain extent. Since the passage flow rate of the heat exchanger 3 can be secured, even if the heating load is large, the temperature drop of the hot water in the heating heat exchanger 3 is kept within a certain range, and the outlet temperature of the heating heat exchanger 3 is increased. By keeping it, hot water at a set temperature for hot water supply is obtained.

  When the amount of hot water used is large, the flow rate through the heating heat exchanger 3 is large and the temperature drop is small, so the hot water circulation pump 5 may be stopped.

  Further, the rotational speed of the hot water supply circulation pump 5 may be finely controlled so that the detected flow rate of the hot water supply flow rate sensor 35 becomes a substantially constant flow rate.

  In order to obtain hot water of a set temperature or higher with hot water supply, the outlet temperature of the heat exchanger 3 for heating needs to be higher than the set temperature of the hot water supply.

  If it is a normal heating load, turning the hot water supply circulation pump 5 at a predetermined number of revolutions can obtain the outlet temperature of the heat exchanger 3 for heating that is sufficiently higher than the maximum set temperature (60 ° C.). There are cases where the outlet temperature of the heating heat exchanger 3 falls below the hot water supply set temperature at a rare timing such as when a plurality of radiators are started to operate or when bathing is started simultaneously. In such a case, the rotation speed of the hot water supply circulation pump 5 is increased until the temperature detected by the hot water supply flow rate sensor 35 becomes equal to or higher than the hot water supply set temperature.

  The control of the hot water supply circulation pump 17 is the same as that during simultaneous operation of hot water supply and heating even during simultaneous operation of hot water supply and bath, hot water supply and heating, and bath.

  In this way, by using a configuration in which the hot water supply passage 3 is branched from the hot water supply circulation circuit 6 after passing through the heating heat exchanger 3 and the bath heat exchanger 4 which are use side heat exchangers, Hot water supply priority operation that can adjust and supply hot water in a wide range from high temperature water to low temperature water to the hot water supply path can be ensured while securing high temperature water necessary for operation.

  Here, the latent heat recovery heat exchanger 20 that recovers the latent heat of the combustion exhaust gas is positioned downstream of the hot water supply heat exchanger 19 with respect to the exhaust gas path, and upstream of the hot water supply heat exchanger 19 with respect to the water supply path. The hot water preheated by the latent heat recovery heat exchanger 16 is heated by the hot water supply heat exchanger 19. As a result, the amount of heat generated by the combustion of the burner 2 can be efficiently exchanged, leading to energy saving.

  As described above, in the present embodiment, one heating path is formed by the hot water supply heat exchanger 19 and the latent heat recovery heat exchanger 20, and the use side load circuit utilizes the circulating water of the heating path. Since the amount of heat is supplied to the heating circuit 21 and the bath circuit 24, the heating heat exchanger 3 and the bath, which are use side heat exchangers not related to the hot water supply heat exchanger 19 and the latent heat recovery heat exchanger 20, are used. The heat exchanger 4 can be configured and the main body configuration including the piping configuration can be simplified to reduce the size and weight of the appliance, and the heating path is mainly used for the hot water supply path, giving priority to hot water supply performance. The hot water supply apparatus can be provided, and the problem of residual water boiling in the heat exchanger during single operation is eliminated by adopting a single heating path configuration mainly including the hot water supply path.

  In addition, when the hot water supply, heating, and bath are operated at the same time, the hot water supply circulation pump 17 is rotated at an appropriate number of revolutions, so even if the size of the heating and bath loads and the amount of hot water used change variously, Hot water with a hot water supply set temperature can always be obtained.

  As described above, the hot water supply apparatus according to the present invention has a hot water supply circulation circuit as a main circuit, hot water supply and heating, or hot water supply and bath, or hot water supply and heating and bath, with a single circulation path as a heat source, and the presence or absence of hot water in the circulation path. After confirming the above, by controlling the burner combustion operation, it is possible to reliably prevent idling, and not only when operating hot water alone, but also when setting hot water at a set temperature not only during hot water supply and heating, but also during simultaneous bath operation. Obtainable. In addition, it is possible to reduce the size and weight of the equipment, ensure sufficient installation space, improve workability, and provide a latent heat recovery heat exchanger to achieve high efficiency and save energy by reducing running costs. Therefore, the present invention can also be applied to uses such as gas and oil hot water bath devices and hot water heaters.

Structure diagram of hot water supply apparatus in Embodiment 1 of the present invention

Explanation of symbols

1 Water supply path 2 Burner (heating means)
3 Heat exchanger for heating (use side heat exchanger)
4 Heat exchanger for bath (use side heat exchanger)
5 Hot Water Circulation Pump 6 Hot Water Circulation Circuit 7 Hot Water Supply Path 19 Heat Exchanger for Hot Water Supply 20 Heat Exchanger for Latent Heat Recovery

Claims (5)

Water supplied from the water supply passage is heated by combustion of the burner and supplied to the hot water supply passage through the latent heat recovery heat exchanger and the hot water supply heat exchanger, and is again returned to the hot water supply heat exchanger by the hot water supply circulation pump. A hot water supply circulation circuit is formed, a use side heat exchanger is provided in the hot water supply circulation circuit to form a circuit for supplying heat to the load side, and branching from the hot water supply circulation circuit via the use side heat exchanger Then, in the hot water supply device of one can multi-channel where a hot water supply circuit for currant or bath pouring is formed, when the use side heat exchanger and the hot water supply are used simultaneously, the hot water supply circulation pump is rotated at a predetermined rotational speed. A hot water supply device to let you. The hot water supply apparatus according to claim 1, wherein when the use-side heat exchanger and the hot water supply are used at the same time, the number of rotations for rotating the hot water supply circulation pump is varied or stopped according to the amount of hot water used. When a flow rate sensor is provided in the hot water supply circulation circuit until it branches to the hot water supply circuit after passing through the use side heat exchanger, and the use side heat exchanger and the hot water supply are used simultaneously, the detected flow rate of the flow rate sensor is predetermined. The hot water supply apparatus according to claim 1, wherein the number of revolutions for rotating the hot water supply circulation pump is varied or stopped so as to be equal to or greater than the value of the above. When a temperature sensor is provided in the hot water supply circulation circuit until it branches to the hot water supply circuit after passing through the use side heat exchanger, and the use side heat exchanger and the hot water supply are used simultaneously, the temperature detected by the temperature sensor is predetermined. The hot water supply apparatus according to claim 1, wherein the number of revolutions for rotating the hot water supply circulation pump is varied or stopped so as to be equal to or greater than the value of the above. When a temperature sensor is provided in the hot water supply circulation circuit until it branches to the hot water supply circuit after passing through the use side heat exchanger, and the use side heat exchanger and the hot water supply are used simultaneously, the temperature detected by the temperature sensor is remote. The hot water supply apparatus according to claim 1, wherein the number of rotations for rotating the hot water supply circulation pump is made variable or stopped so as to be equal to or higher than a required temperature of hot water supply set by a control device.

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