JPH04151451A - Controlling method of hot water supply of combination type tap-controlled water heater - Google Patents

Abstract

PURPOSE:To lessen an error of the temperature of hot water supply from a set temperature of hot water supply by a method wherein the error of the temperature of hot water supply from the set temperature of hot water supply is led out on the basis of a stored correspondence to a measured temperature of tap water and thereby the amount of operation of an operating mechanism is corrected. CONSTITUTION:A control means 13 stores the correspondence of an error of the temperature of hot water supply from a set temperature of hot water supply in relation to the deviation of tap water from a reference temperature, leads out the error of the temperature of hot water supply from the set temperature of hot water supply on the basis of the correspondence to a measured temperature of the tap water, and corrects the amount of operation of an operating mechanism 9. When a hot water supply is executed with a desired set temperature of hot water set, according to this constitution, and when the temperature of the tap water deviates from the reference temperature, the control means 13 leads out the error of the temperature of hot water from the set temperature of hot water in relation to the deviation on the basis of the correspondence of the error of the temperature of hot water to the set temperature of hot water stored beforehand, and corrects the amount of operation of the operating mechanism 9 so that this error be minimum. Therefore the error of the temperature of hot water from the set temperature of hot water can be diminished.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hot water supply control method for a hot water mixing type instantaneous water heater.

(Prior art) In contrast to conventional instantaneous water heaters that simply heat tap water in a heat exchanger and dispense the hot water as is, in recent years, water heaters that mix the hot water from the heat exchanger with tap water have been developed. Instantaneous water heaters that can supply hot water at a desired temperature are becoming available. The former has problems such as difficulty in supplying hot water at an appropriate temperature at a small flow rate in summer due to the range of heat generated by the heating means such as a burner that heats the heat exchanger, whereas the latter It is possible to solve problems such as: For example, a conventional example of the latter is disclosed in Japanese Patent Laid-Open No. 2-183733.

The applicant has previously proposed that hot water from a heat exchanger and tap water can be combined and mixed to supply hot water at a desired temperature in an instantaneous water heater. We proposed a hot water supply mechanism that uses a mixing valve that can freely change the flow rate ratio by moving the valve body using a thermally responsive element installed in the merging channel. (For example, refer to the specification and drawings attached to the application of Japanese Patent Application No. 1-344752.) To explain with reference to FIGS. 1 and 2, this hot water supply mechanism passes through a heat exchanger 3 provided with a burner 12. A water path 5 is provided in parallel with the hot water path 1, which is branched on the upstream side of the heat exchanger 3 and merged through the mixing valve 4 on the downstream side. The valve body is moved by a responsive element 7 to change the flow rate ratio between the water path 5 and the hot water path 1, and the thermally responsive element 7 is connected to the hot water outlet temperature setting device 1.
In addition, the burner 12 is controlled by the control means 13 using a temperature sensor 15 provided on the downstream side of the heat exchanger 3, and The water temperature on the downstream side is adjusted to a predetermined temperature.

In such a configuration, the combustion of the burner 12 causes the heat exchanger 3 to
The hot water that has been heated up and flowed through the production path 1 is mixed with the tap water that has flowed through the water path 5 at the mixing valve 4, the temperature of which is lowered, and the hot water flows through the confluence path 6 and is discharged from the hot water outlet 19. Ru. At this time, the control means 13 performs feedback control of the burner 12 based on the measured value of the temperature sensor 15, thereby controlling the heat exchanger 3.
The hot water on the downstream side of is adjusted to a predetermined temperature, for example 80°C,
The thermally responsive element 7 provided in the merging path 6
The valve body 8 is moved in response to the temperature of the hot water inside to change the flow rate ratio of the water path 5 and the production path 1, and thus the temperature of the hot water in the confluence path 6 is adjusted according to the bias amount of the thermally responsive element 7. The value can be adjusted. This bias amount can be changed by the actuating mechanism 9 in accordance with the hot water setting temperature of the hot water tap temperature setting device 14, thereby making it possible to supply hot water adjusted to the hot water tap temperature setting. This operating mechanism 9 is
For example, it can be constructed from a mechanism using a motor, a rotational-linear motion conversion mechanism, and a potentiometer for detecting the position thereof. And in such a configuration,
The bias amount of the thermally responsive element 7 is, for example, when the water temperature is 15°C.
and a water temperature of 80° C. on the downstream side of the heat exchanger 3, respectively, are set as reference temperatures. That is, as shown in FIG. 3, for example, the control means 13 stores and sets in advance the correspondence between the tapping temperature at the reference temperature and the voltage value of the potentiometer corresponding to the bias amount, and the correspondence is set in advance. The bias amount is set based on the relationship.

(Problem to be Solved by the Invention) Conventionally, the above-mentioned correspondence relationship used for setting the bias amount in the control means 13 was only for the reference temperature, so for example, as shown in FIG. 4(a), When the tap water temperature rises above the reference temperature, the hot water outlet temperature rises above the set hot water outlet temperature, resulting in an error. Also, as shown in FIG. 4(b), when the hot water temperature on the downstream side of the heat exchanger 3 decreases, the outlet hot water temperature If the tap water temperature and the downstream hot water temperature change in the opposite direction to the above-mentioned direction, the tap water temperature will deviate from the hot water set point temperature in the opposite direction to the above-mentioned direction, resulting in an error. .

The present invention aims to solve this problem.

(Means for Solving the Problems) Means for solving the above-mentioned problems will be explained with reference to the attached drawings.The first configuration of the hot water supply control method of the present invention is that a heating means 12 is provided. In parallel with the production route 1 passing through the heat exchanger 3, a water route 5 is provided which is branched on the upstream side of the heat exchanger 3 and merged via the mixing valve 4 on the downstream side, and the mixing valve 4 is a merging route. The configuration is such that a valve body 8 is moved by a thermally responsive element 7 provided in the hot water outlet temperature setting device 6 to change the flow rate ratio of the water path 5 and the production path 1, and the thermally responsive element 7 is used to set the hot water outlet temperature setting device 4. The heating means 12 is configured to be biased by the operating mechanism 9 in accordance with the temperature.
is controlled by a control means 13 using a temperature sensor 15 provided on the downstream side of the heat exchanger 3, and the water temperature on the downstream side is controlled to a predetermined temperature in 11 steps. In this case, the control means 13 stores the correspondence relationship between the set hot water temperature and the error in the hot water temperature with respect to the deviation from the reference temperature of the tap water, and calculates the difference from the set hot water temperature with respect to the measured tap water temperature based on the correspondence relationship. The gist is to correct the operating amount of the operating mechanism 9 by deriving the error in the hot water temperature.

In addition, the second configuration is such that, in parallel with the production route 1 passing through the heat exchanger 3 provided with the heating means [2], it is branched on the upstream side of the heat exchanger 3 and merged via the mixing valve 4 on the downstream side. In addition to providing a water path 5, the mixing valve 4 is configured to move a valve body 8 through a thermally responsive element 7ζ provided in a confluence path 6 to change the flow rate ratio between the water path 5 and the manufacturing path 1. The thermally responsive element 7 is configured to be biased by the operating mechanism 9 in accordance with the hot water setting temperature of the hot water tap temperature setting device 14, and the heating means 12 is provided using a temperature sensor 15 provided on the downstream side of the heat exchanger 3. In the hot water mixing type instantaneous water heater configured to control the water temperature on the downstream side to a predetermined temperature by controlling the temperature of the water on the downstream side by a control means 13, the control means 3 is the heat exchanger 3.
The correspondence relationship between the hot water temperature setting and the error in the hot water tap temperature relative to the deviation of the downstream hot water temperature from the standard temperature is stored, and the hot water output from the hot water tap temperature setting is determined based on the correspondence relationship for the measured downstream hot water temperature. The gist is to correct the operating amount of the operating mechanism 9 by deriving the temperature error.

Furthermore, the third configuration is to branch the hot water path upstream of the heat exchanger 3 in parallel with the hot water path l passing through the heat exchanger 3 provided with the heating means J2, and to merge the hot water path through the mixing valve 4 on the downstream side. In addition to providing a water path 5, the mixing valve 4 is configured to move a valve body 8 using a thermally responsive element 7 provided in a confluence path 6 to change the flow rate ratio between the water path 5 and the hot water path 1. The thermally responsive element 7 is configured to be biased by the actuating mechanism 9 in accordance with the hot water setting temperature of the hot water tap temperature setting device 4, and
The heating means) 2 is controlled by a control means 13 using a temperature sensor 15 provided downstream of the heat exchanger 3 to adjust the temperature of the water on the downstream side to a predetermined temperature. In the water heater, the control means 13 controls the correspondence between the set hot water temperature and the error in the hot water temperature relative to the deviation from the standard temperature of the tap water, and the deviation from the standard temperature of the water temperature downstream of the heat exchanger 3. The correspondence relationship between the set hot water temperature and the error in the hot water temperature is memorized, and each error in the hot water temperature from the set hot water temperature is derived from the set hot water temperature based on the corresponding relationship for the measured tap water temperature and the downstream hot water temperature. The gist of the present invention is to correct the amount of operation of the actuation mechanism 9 by the algebraic sum of these values.

In the fourth configuration, in the first configuration, the control means 13 is provided with a reference value for the tap water instead of the correspondence relationship between the set hot water temperature and the error in the hot water tap temperature with respect to the deviation from the standard temperature of the tap water. The configuration may be such that the correspondence between the correction amount and the deviation from the temperature is stored and control is performed directly.

Further, a fifth configuration is the control means 1 in the second invention.
3 shows the correspondence of the correction amount to the deviation of the hot water temperature from the standard temperature, instead of the correspondence between the hot water set temperature and the error of the hot water tap temperature with respect to the deviation of the hot water temperature on the downstream side of the heat exchanger 3 from the standard temperature. It is possible to have a configuration in which relationships are stored and control is performed directly.

Furthermore, a sixth configuration is the control means 1 in the third configuration described above.
3, instead of the correspondence between the error in the hot water outlet temperature and the hot water outlet temperature with respect to the deviation from the reference temperature of the water temperature on the downstream side of the water supply and the heat exchanger 3, the correspondence relationship of the correction amount with respect to these deviations is shown. It is possible to have a configuration in which the information is stored and directly controlled.

(Function) First, when dispensing hot water by setting a desired preset hot water dispensing temperature, if the temperature of tap water deviates from the reference temperature, the control means] 3 sets the pre-stored dispensing hot water temperature. From the correspondence between the temperature and the error in the hot water outlet temperature, the error in the outlet temperature from the set outlet temperature for the deviation is derived, and the operating amount of the actuating mechanism 9 is corrected so as to minimize this error. It is possible to reduce the error between the hot water temperature and the hot water setting temperature.

In addition, in the second configuration, when the hot water temperature on the downstream side of the heat exchanger 3 deviates from the reference temperature, the control means 13 uses the correspondence relationship between the pre-stored hot water tap temperature and the error between the hot water tap temperature and the hot water tap temperature. Since the error in the hot water outlet temperature from the hot water outlet temperature set point with respect to the deviation is derived and the operating amount of actuator #19 is corrected so as to minimize this error, the error between the outlet hot water temperature and the hot water outlet set temperature is reduced. can do.

And the third configuration is similar to the above, even if the temperature of the tap water deviates from the reference temperature or even if the temperature of the hot water on the downstream side of the heat exchanger 3 deviates from the reference temperature, the hot water temperature and the set hot water temperature can be adjusted. The error can be reduced.

Moreover, in the fourth to sixth configurations, the first to third controls described above can be performed more directly.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

First, Figure 1 shows the overall configuration of an example of a hot water mixing type instantaneous water heater to which the present invention is applied. A water path 5 is provided in parallel with this hot water path 1, which is branched on the upstream side of the heat exchanger 3 and merged through the mixing valve 4 on the downstream side. Mixing valve 4
As shown in FIG.
It is configured to change the flow rate ratio of , and is provided with an actuation mechanism 9 that biases the thermally responsive element 7 . The actuation mechanism 9 can be composed of, for example, a motor, a rotational-linear motion conversion mechanism, a potentiometer for detecting the position thereof, and the like. Further, the thermally responsive element 7 is configured to thermally expand and contract by enclosing wax, for example, so that the movement direction of the valve body 8 due to thermal expansion is a direction that decreases the amount of hot water in the production path 1 and increases the amount of water in the water path 5. It is said that The thermally responsive element 7 has a structure in which the amount of bias is adjusted by an actuating body 11 via a bias spring 10, and this actuating body 11 is actuated by the actuating mechanism 9 as described above to move it in the vertical direction in the figure. There is. In the above configuration, Fig. 3(a) shows a state where the amount of hot water in the production path 1 is large, and in this state, the wax expands and Fig. 3(b)
When the thermally responsive element 7 thermally expands as shown in FIG. However, if the water temperature drops too much and the thermally responsive element 7 contracts, the valve body 8
is moved upward to reduce the amount of water in the water path 5, and
By increasing the amount of hot water in the production path 1 to raise the temperature of the hot water in the merging path 6, the temperature of the hot water flowing through the merging path 6 can be controlled. When the thermally responsive element 7 is biased downward by the operating mechanism 9, the set hot water temperature can be lowered, and conversely, when the thermally responsive element 7 is biased upward, the set hot water temperature can be increased.

Reference numeral 12 denotes heating means for heating the heat exchanger 3. In the illustrated example, the second heating means 12 is a burner 12, but an electric heater or the like may be used in addition to the burner 12. Reference numeral 13 denotes a control means, and 14 a hot water outlet temperature setter. Based on the temperature of the hot water from the
The combustion amount of No. 2 is feedback controlled. The control means 13 adds λ to this feedback control, and performs feedforward control based on the measured value of the flow rate measuring means 16 that measures the flow rate of the manufacturing path l, the temperature sensor 17 that measures the temperature of the tap water, and the target temperature. The configuration is such that they can be used together. Furthermore, the control means 13 can also be configured to also perform ON-OFF control of the burner 12.

Further, the control means 13 is configured to operate the actuation mechanism 9 to set the bias to the thermally responsive element 7 . That is, the control means 13 sets, for example, the temperature of the tap water at 15° C. and the temperature of the hot water on the downstream side of the heat exchanger 3 at 80° C. as reference temperatures, respectively, and maintains the state at the reference temperatures as shown by the solid line in FIG. 3, for example. The correspondence relationship between the hot water outlet temperature and the voltage value of the potentiometer corresponding to the bias amount is stored and set in advance, and the correspondence relationship between the hot water set temperature and the error between the hot water outlet temperature and the deviation from the reference temperature of the tap water and the heat exchanger. The correspondence relationship between the set hot water temperature and the error in the hot water temperature with respect to the deviation of the hot water temperature on the downstream side of No. 3 from the reference temperature is stored. These correspondence relationships can be stored and set as a function formula or a data table.

As mentioned above, the control means 13 stores and sets one of these correspondence relationships to perform control,
It is possible to memorize and set both to perform control. In the latter case, a means for adding errors derived from the respective correspondence relationships is provided, and the algebraic sum obtained by addition by this adding means is used as the error corresponding to the correction amount.

In the above configuration, the temperature is raised to the above reference temperature in the heat exchanger 3 by combustion in the burner 12, flows through the manufacturing path 1, and is passed through the mixing valve 4.
The hot water that has reached this temperature is mixed with the standard temperature tap water that has flowed through the water path 5 in this mixing valve 4, and its temperature is lowered.
The hot water flows through the hot water and is discharged from the hot water outlet 19. At this time, confluence route 6
The heat-responsive element 7 provided therein moves the valve body 8 in response to the temperature of the water in the merging channel 6, so that the water channel 5 and the production channel 1
The flow rate ratio changes, and thus the temperature of the hot water in the confluence channel 6 can be adjusted to a value corresponding to the bias amount of the thermally responsive element 7. As shown by the solid line in FIG. 3, this bias amount is determined by the tapping temperature setter 14 based on the correspondence between the tapping temperature at the reference temperature and the voltage value of the potentiometer corresponding to the bias amount. Determined according to the temperature set.

In this way, when both the tap water temperature and the hot water temperature on the downstream side of the heat exchanger 3 are at the reference temperature, there is no error between the hot water outlet temperature and the hot water outlet temperature, so the correspondence relationship shown by the solid line in Fig. 3 is established. Based on this, for example, when the hot water tap temperature is 50° C., if the operating mechanism 9 is operated so that the potentiometer voltage becomes 3 (V), a hot water tap temperature of 50° C. can be obtained.

In this kind of control, the hot water heated by the burner 12 in the heat exchanger 3 can be cooled with tap water and then discharged from the hot water outlet]9, so if the minimum combustion amount of the burner 12 is relatively large, It is also possible to supply hot water at a low temperature with a small flow rate. In addition, when used intermittently at relatively short time intervals, the hot water in the hot water path 1 may be contaminated with hot water (overshoot) due to after-boiling in the heat exchanger 3 or cold water due to the ignition delay of the burner 12. Even if there is an undershoot, etc., it will not be transmitted to the hot water in the confluence channel 6.

In the above operation sequence, assuming that only the temperature of the tap water has risen above the reference temperature, if the bias amount of the thermally responsive element 7 remains unchanged, the tapped water temperature will rise as shown in Fig. 4(a). It rises as the water temperature rises. That is, when the temperature of the tap water rises above the reference temperature, the correspondence relationship between the hot water temperature and the voltage value of the potentiometer shifts upward from the reference correspondence relationship, as indicated by the dashed-dotted line in FIG.

That is, with the same potentiometer voltage, the tapped water temperature will increase. Therefore, the control means 13 controls the error e between the hot water setting temperature and the hot water temperature with respect to the deviation from the standard temperature of the tap water.
From the correspondence relationship, derive a correction voltage (■) to obtain a predetermined hot water temperature of 50°C, and add this correction voltage V to the above 3 (■), that is, 3 + v (V) so that it becomes the voltage of the potentiometer. By controlling the temperature, a predetermined hot water temperature can be obtained. Note that the above-mentioned correction voltage (■) includes a sign, and in the above example, the correction voltage V is subtracted from the above-mentioned 3 (V). Contrary to the above, when the water voltage drops from the standard temperature, the correspondence between the hot water temperature and the voltage value of the potentiometer shifts downward from the standard correspondence, as shown by the two-dot chain line in Figure 3. In this case as well, a predetermined tapping temperature can be obtained by deriving a correction voltage and correcting the voltage of the potentiometer, as described above.

Next, when the target value for controlling the hot water temperature on the downstream side of the heat exchanger 3 is changed depending on the hot water output amount and other conditions, when the hot water temperature decreases, the bias amount of the thermally responsive element 7 is changed. If left as is, the temperature of the outlet hot water will drop in accordance with the drop in the second hot water temperature, as shown in FIG. 4(b). First, when the hot water temperature falls below the reference temperature, the correspondence between the outlet hot water temperature and the voltage value of the potentiometer shifts downward from the standard correspondence, as indicated by the two-dot chain line in FIG. Therefore, the control means 13 derives a correction voltage V for obtaining a predetermined hot water tap temperature of 50°C from the correspondence relationship between the hot water set temperature and the error e of the hot water tap temperature with respect to the deviation of the hot water temperature from the reference temperature, and Similarly, by correcting the voltage of the potentiometer, a predetermined hot water temperature can be obtained.

Since the above-mentioned change in the water temperature and the change in the hot water temperature on the downstream side of the heat exchanger 3 occur independently, the above-mentioned error in the outlet temperature due to these changes becomes an algebraic sum. Therefore, by providing the control means 13 with an addition means or the like that performs these algebraic sum operations, it is possible to eliminate these errors and obtain a predetermined tapping temperature in the same manner as described above.

Note that the above-mentioned control means 13 includes water supply or heat exchanger 3.
In place of the correspondence between the hot water setting temperature and the error in the hot water output temperature with respect to the deviation of the hot water temperature on the downstream side from the respective reference temperature, the correspondence of the correction amount with respect to these deviations is stored and directly controlled. It can be done.

Furthermore, in the above embodiment, the flow rate measuring means includes the flow Ik measuring means 18 capable of measuring the total flow rate and the flow rate measuring means 16 capable of measuring the flow rate of the hot water route. The flow rate of route 1 can also be calculated from the total flow rate measured by the flow rate measuring means 18, the tap water temperature, the hot water outlet temperature, and the hot water temperature on the downstream side of the heat exchanger. The measuring means 16 can be omitted.

(Effects of the Invention) As described above, the present invention provides a hot water/water mixing type instant water heater that mixes hot water from a heat exchanger and tap water in a mixing valve to supply hot water at a desired temperature. In a mixing valve, the hot water and clean water are mixed by a mixing valve that moves a valve body using a heat-responsive element installed in the confluence channel to freely change the flow rate ratio, and the temperature of the clean water and heat exchange are controlled. Even if the water temperature on the downstream side of the vessel deviates from the reference temperature that is the reference temperature for the operation of the thermally responsive element, the error in the hot water temperature or the operating mechanism can be directly corrected based on the correspondence stored in advance in the control means. Derive the quantity and
Since the operating amount of the operating mechanism is corrected so as to minimize this error, there is an effect that the error between the hot water outlet temperature and the hot water outlet set temperature can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the overall configuration of an embodiment of a hot water supply mechanism to which the present invention is applied, and FIGS. 2 (a) and (b) are explanatory cross-sectional views showing the configuration and operation of an embodiment of a mixing valve. It is. Further, FIG. 3 is an explanatory diagram showing the correspondence relationship between the tapping temperature and the voltage of the potentiometer that constitutes the operating mechanism of the thermally responsive element.
FIGS. 4(a) and 4(b) are explanatory diagrams showing conventional hot water discharge characteristics when the water temperature and the temperature of hot water on the downstream side of the heat exchanger change, respectively. Code 1...Hot water route, 2...Hot water generator, 3...Heat exchanger, 4...Mixing valve, 5...Water route, 6...Merge path, 7
...Thermal response element, 8... Valve body, 9... Actuation mechanism,
DESCRIPTION OF SYMBOLS 10... Bias spring, 11... Working body, 12... Heating means (burner), 13... Control means, 14... Hot water temperature setting device, 15.17... Temperature sensor, 16... Flow rate Measuring means, 18, total flow rate measuring means, 19... tap, 20 return spring. Figure 3 Figure 4 (α) Figure 4 (b) Clear air patrol

Claims (1)

[Scope of Claims] (1) In parallel with a hot water route passing through a heat exchanger provided with a heating means, a water route is provided that branches on the upstream side of the heat exchanger and joins through a mixing valve on the downstream side. In addition, the mixing valve is configured to change the flow rate ratio of the water path and the hot water path by moving the valve body using a thermally responsive element provided in the merging path, and the thermally responsive element is used to adjust the hot water output setting of the hot water tap temperature setting device. The heating means is configured to be biased by an operating mechanism in accordance with the temperature, and the heating means is controlled by a control means using a temperature sensor provided downstream of the heat exchanger, so that the temperature of the water on the downstream side is maintained at a predetermined temperature. In the hot water mixing type instantaneous water heater configured to adjust the hot water to the hot water, the control means stores a correspondence relationship between an error in the hot water outlet temperature and an error in the hot water outlet temperature with respect to a deviation from a reference temperature of the tap water;
Hot water supply control for a hot water mixing type instantaneous water heater, characterized in that the error in the hot water outlet temperature from the hot water outlet set temperature is derived from the measured tap water temperature based on the correspondence relationship, and the operating amount of the actuating mechanism is corrected. Method (2) In parallel with the hot water path passing through a heat exchanger provided with a heating means, a water path is provided that branches on the upstream side of the heat exchanger and joins through a mixing valve on the downstream side, and the mixing valve The valve body is moved by a thermally responsive element provided in the merging path to change the flow rate ratio between the water path and the hot water path, and the thermally responsive element is moved in accordance with the hot water setting temperature of the hot water tap temperature setting device. The heating means is biased by an operating mechanism, and the heating means is controlled by a control means using a temperature sensor provided downstream of the heat exchanger to adjust the temperature of the water on the downstream side to a predetermined temperature. In the hot water mixing type instantaneous water heater, the control means stores and measures the correspondence relationship between the hot water outlet temperature setting and the hot water outlet temperature error with respect to the deviation of the hot water temperature on the downstream side of the heat exchanger from the reference temperature. The hot water supply of the hot water mixing type instantaneous water heater is characterized in that the operating amount of the operating mechanism is corrected by deriving an error in the outlet temperature from the outlet hot water set temperature based on the correspondence relationship with respect to the downstream water temperature. Control method (3
) A water path is provided in parallel with the hot water path passing through the heat exchanger provided with the heating means, and is branched on the upstream side of the heat exchanger and merged through the mixing valve on the downstream side, and the mixing valve is connected to the merging path. The valve body is moved by a thermally responsive element provided therein to change the flow rate ratio between the water path and the hot water path, and the thermally responsive element is moved by an operating mechanism in accordance with the hot water setting temperature of the hot water tap temperature setting device. A hot water mixture having a bias configuration and a configuration in which the heating unit is controlled by a control unit using a temperature sensor provided on the downstream side of the heat exchanger to adjust the temperature of the hot water on the downstream side to a predetermined temperature. In the type instantaneous water heater, the control means is configured to control the correspondence between the set hot water temperature and the error in the hot water temperature relative to the deviation from the reference temperature of the tap water, and the deviation from the reference temperature of the water temperature downstream of the heat exchanger. The correspondence relationship between the set hot water temperature and the error in the hot water temperature is memorized, and each error in the hot water temperature from the set hot water temperature is derived from the set hot water temperature based on the corresponding relationship for the measured tap water temperature and the downstream hot water temperature. (4) A hot water supply control method for a hot water mixing type instantaneous water heater, characterized in that the operating amount of the operating mechanism is corrected by the algebraic sum thereof. Instead of the correspondence between the set hot water temperature and the error between the hot water supply temperature and the deviation from the standard temperature, the system stores the correspondence between the correction amount and the deviation from the reference temperature of the tap water, and directly performs control. (5) The control means according to claim 2 includes a method for controlling the hot water supply in a hot water mixing type instantaneous water heater (5), wherein the control means includes a method for dealing with an error between the hot water set temperature and the hot water temperature with respect to the deviation of the hot water temperature on the downstream side of the heat exchanger from the reference temperature. A hot water supply control method for a hot water mixing type instantaneous water heater, characterized in that instead of the relationship, the correspondence of the correction amount to the deviation of the hot water temperature from the reference temperature is stored and directly controlled. 6) In the control means of claim 1, instead of the correspondence between the error of the hot water outlet temperature and the hot water outlet temperature with respect to the deviation from the reference temperature of the water temperature on the downstream side of the tap water and the heat exchanger, these deviations are provided. (7) A hot water supply control method for a hot/cold water mixing type instantaneous water heater, characterized in that the correspondence relationship of the correction amount to the corresponding one is stored and the control is performed directly. Hot water supply control method for a hot water/cold water mixing type instantaneous water heater (8) The thermally responsive element according to claim 1 is characterized in that the thermally responsive element has a built-in wax and is configured to expand and contract according to the surrounding temperature. Hot water supply control method for a mixed instantaneous water heater