JP7011982B2 - Heating equipment - Google Patents

Description

The present invention relates to a heating device such as an oil fan heater.

As a heating device for an oil fan heater or the like, a hot air type heater having a save operation function is known (see, for example, Patent Document 1).

In this hot air heater, when the save operation switch is operated, the set temperature is gradually lowered (for example, after the room temperature reaches the set temperature, for example, it is lowered by 1 ° C after 30 minutes and then by 1 ° C after 30 minutes). Save operation is executed. Then, during this save operation or after the save operation is completed, the rotation speed of the warm air fan motor is made higher than the normal value. By such control, the energy saving effect by the save operation and the uniform room temperature by the warm air fan motor are achieved (see paragraph [0016] of Patent Document 1, FIG. 4).

Japanese Unexamined Patent Publication No. 08-152196

However, in the hot air type heater described in Patent Document 1, since the set temperature is gradually lowered in the save operation (energy saving operation), the room temperature is also gradually lowered. Therefore, there is a possibility that the feeling of heating is impaired and the person feels cold. Further, since the rotation speed of the hot air fan motor is continued in a state higher than the normal value, for example, when the combustion amount (heat power) is small, the flame is easily extinguished and the combustion state may be deteriorated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heating device capable of energy-saving operation that improves the heating effect while maintaining a good combustion state.

In order to solve the above problems, the heating device according to the present invention includes a main body forming an outer frame and a burner portion arranged in the main body and burning vaporized fuel oil. Further, the heating device is arranged inside the main body, and includes a convection fan that exchanges heat with the combustion gas generated by combustion of the burner portion and discharges the air taken from the outside of the main body to the outside of the main body. Further, the heating device controls the thermal power of the burner unit based on the difference between the temperature setting unit for setting the set temperature, the room temperature detecting means for detecting the room temperature, and the set temperature and the detected room temperature. It is equipped with a control unit. Then, the control unit executes a normal operation and an energy-saving operation in which the maximum level of the thermal power of the burner unit is smaller than that of the normal operation. Further, the control unit sets the rotation speed of the convection fan corresponding to the thermal power of the burner unit at a predetermined level or higher in the energy-saving operation to be equal to the thermal power in the energy-saving operation of the convection fan corresponding to the thermal power in the normal operation. Make it larger than the rotation speed.

According to the present invention, it is possible to provide a heating device capable of energy-saving operation that improves the heating effect while maintaining a good combustion state.

It is a schematic sectional drawing which shows the heating apparatus which concerns on one Embodiment of this invention. It is a schematic block diagram which shows the control composition of a heating device. FIG. 3A is a diagram showing the level of rotation speed of the convection fan corresponding to each level of thermal power in normal operation. FIG. 3B is a diagram showing the level of the rotation speed of the convection fan corresponding to each level of the thermal power in the energy-saving operation. It is a figure for demonstrating the fluctuation temperature control operation. It is a flowchart which shows the content of operation in the normal operation of a heating device. It is a flowchart which shows the content of the operation in the energy saving operation of a heating device. It is a graph which shows the transition of the room temperature in the energy-saving operation of a heating device schematically.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In each figure, common components and similar components are designated by the same reference numerals, and overlapping description thereof will be omitted as appropriate.

FIG. 1 is a schematic cross-sectional view showing a heating device 100 according to an embodiment of the present invention.
As shown in FIG. 1, the heating device 100 includes a main body 1 forming an outer frame and a burner portion 2 arranged in the main body 1 and burning vaporized fuel oil. The burner unit 2 has a vaporizer 3 that vaporizes the fuel oil, and a burner head 4 that is arranged above the vaporizer 3 and serves as a combustion unit that burns the vaporized fuel oil.

The vaporizer 3 has a bottomed tubular shape. A heater 5 for heating the vaporizer 3 is arranged on the side wall portion or the bottom portion of the vaporizer 3 by, for example, casting. A heat recovery ring 22 for recovering combustion heat to the vaporizer 3 is provided around the burner head 4.

Further, the heating device 100 includes an electromagnetic pump 8 that supplies the fuel oil in the fuel tank 7 to the vaporizer 3 via the fuel pipe 6, and a combustion fan 10 that supplies combustion air to the vaporizer 3 via the air passage 9. And have.

A large number of flame holes 11 are formed in the side wall portion of the burner head 4. A spark plug 12 as an ignition means and a flame detecting means 13 are arranged in the vicinity of the outer peripheral surface of the burner head 4. The spark plug 12 ignites by high-pressure discharge in a mixture of vaporized fuel oil ejected from the flame hole 11 and combustion air. The flame detecting means 13 detects the presence or absence of a flame and the combustion state and outputs a signal, and is also called a frame rod.

Further, inside the main body 1, a convection fan 14 is arranged which exchanges heat with the combustion gas generated by the combustion of the burner portion 2 and discharges the air taken in from the outside of the main body 1 to the outside of the main body 1. By the operation of the convection fan 14, the external air taken in from the air intake port 15 provided on the back surface of the main body 1 is heated to become warm air, and the warm air outlet 16 provided on the front surface of the main body 1 becomes warm air. Is blown into the room.

FIG. 2 is a schematic block diagram showing a control configuration of the heating device 100.
As shown in FIG. 2, the heating device 100 includes an operation unit 17, a room temperature detecting means 18, a vaporizer temperature detecting means 19, and a control unit 20. The operation unit 17 accepts the user's operation. The operation unit 17 has various switches and buttons such as a temperature setting unit 17a, an operation switch 17b, and an eco switch 17c. The temperature setting unit 17a sets the set temperature based on the operation of the user. The operation switch 17b instructs the start and stop of the heating operation. The eco switch 17c instructs the start and stop of the energy-saving operation. Further, the room temperature detecting means 18 detects the room temperature, which is the temperature in the room where the heating device 100 is placed. The vaporizer temperature detecting means 19 detects the temperature of the vaporizer 3.

The control unit 20 includes a CPU (Central Processing Unit) and a memory, and controls the operation of the heating device 100 in an integrated manner. Various controls by the control unit 20 are realized by reading the program stored in advance in the storage means 21 into the memory and executing the CPU.

For example, the control unit 20 controls the thermal power of the burner unit 2 based on the difference between the set temperature set by the temperature setting unit 17a and the room temperature detected by the room temperature detecting means 18. The thermal power is adjusted by changing the amount of fuel supplied by the electromagnetic pump 8 and the rotation speed of the combustion fan 10. Here, an appropriate amount of combustion air is determined according to the amount of fuel supplied, and the storage means 21 has the amount of fuel supplied by the electromagnetic pump 8 and the rotation speed of the combustion fan 10 for each level of thermal power. Is remembered.

Further, the control unit 20 can execute normal operation and energy-saving operation.
FIG. 3A is a diagram showing the level of the rotational speed of the convection fan 14 corresponding to each level of thermal power in normal operation. FIG. 3B is a diagram showing the level of the rotational speed of the convection fan 14 corresponding to each level of thermal power in the energy-saving operation. The correspondence data between the thermal power shown in FIGS. 3A and 3B and the rotation speed of the convection fan 14 is stored in the storage means 21.

As shown in FIGS. 3 (a) and 3 (b), the maximum level of thermal power in normal operation is “5”, and the maximum level of thermal power in energy-saving operation is “4”. That is, in the energy-saving operation, the maximum level of the thermal power of the burner portion 2 is smaller than that in the normal operation.

Further, the control unit 20 of the convection fan 14 corresponding to the thermal power in the normal operation in which the rotation speed of the convection fan 14 corresponding to the thermal power of the burner unit 2 in the energy-saving operation equal to or higher than the predetermined level is equal to the thermal power in the energy-saving operation. Make it larger than the rotation speed.

For example, the control unit 20 sets the rotation speed of the convection fan 14 corresponding to the thermal power of the maximum level “4” of the burner unit 2 in the energy-saving operation to the rotation speed of the convection fan 14 corresponding to the thermal power “4” in the normal operation. Make it larger than "4". Here, the control unit 20 sets the rotation speed of the convection fan 14 corresponding to the maximum level "4" of the burner unit 2 in the energy-saving operation to the convection fan corresponding to the maximum level "5" of the thermal power in the normal operation. Equal to the rotation speed "5" of 14.

Further, the control unit 20 executes the fluctuation temperature control operation in the energy saving operation.
FIG. 4 is a diagram for explaining the fluctuation temperature control operation. FIG. 4 shows a change in the correction value with respect to the set temperature T ₀ from the start of the fluctuation temperature control operation to 60 minutes, and the same pattern of change in the correction value is continued in the subsequent time. The pattern of change in the correction value shown in FIG. 4 is stored in the storage means 21.

As shown in FIG. 4, in the energy-saving operation, the fluctuation temperature control operation is controlled after the difference between the set temperature T ₀ and the room temperature T becomes equal to or less than the predetermined temperature difference. Here, in the energy-saving operation, the following control is performed after the difference between the set temperature T ₀ and the room temperature T becomes 0.0 ° C., that is, after the room temperature T reaches the set temperature T ₀ . There is. That is, the control unit 20 performs a process including a first control using the first control temperature T ₁ , a second control using the second control temperature T ₂ , and a third control using the third control temperature T ₃ . Repeat. However, the pattern of change in the correction value shown in FIG. 4 is an example and can be changed as appropriate. For example, yet another control temperature may be used, or the execution order of the first control, the second control, and the third control may be changed.

The first control temperature T ₁ is set, for example, 1 ° C. lower than the set temperature T ₀ . The second control temperature T ₂ is set to a temperature equal to the set temperature T ₀ . The third control temperature T ₃ is set, for example, 0.8 ° C. lower than the set temperature T ₀ . That is, in the first control, the control unit 20 controls the thermal power of the burner unit 2 based on the difference between the detected room temperature T and the first control temperature T ₁ which is 1 ° C. lower than the set temperature T ₀ . Further, in the second control, the control unit 20 controls the thermal power of the burner unit 2 based on the difference between the second control temperature T ₂ equal to the set temperature T ₀ and the detected room temperature T. Further, in the third control, the control unit 20 controls the thermal power of the burner unit 2 based on the difference between the detected room temperature T and the third control temperature T ₃ which is 0.8 ° C. lower than the set temperature T ₀ .

Next, the operation of the heating device 100 according to the present embodiment will be described with reference to FIGS. 5 to 7. FIG. 5 is a flowchart showing the contents of the operation of the heating device 100 in the normal operation. FIG. 6 is a flowchart showing the contents of the operation of the heating device 100 in the energy-saving operation. FIG. 7 is a graph schematically showing the transition of the room temperature T in the energy-saving operation of the heating device 100.

When the operation switch 17b of the operation unit 17 is turned on, the control unit 20 starts normal operation when the eco switch 17c is turned off, and energy-saving operation when the eco switch 17c is turned on. To start.

First, normal operation will be described.
As shown in FIG. 5, in step S101, the control unit 20 acquires the set temperature T ₀ set by the temperature setting unit 17a.

In step S102, the control unit 20 sets the thermal power of the burner unit 2 to the maximum level “5” and operates the heating device 100. At this time, the rotation speed of the convection fan 14 is set to the level "5" (see FIG. 3A). Then, the room temperature T rises as the operation of the heating device 100 is continued.

In step S103, the room temperature T is detected by the room temperature detecting means 18. Subsequently, in step S104, it is determined whether or not (room temperature T − set temperature T ₀ ) is −0.5 ° C. or lower. When (TT ₀ ) ≦ −0.5 ° C. (Yes in S104), the process proceeds to step S105, and when (TT ₀ )> −0.5 ° C. (No in S104), step. Processing proceeds to S106.

Step S105 will be executed when the room temperature T is lower than the set temperature T ₀ by a certain degree or more. In step S105, the control unit 20 sets the thermal power of the burner unit 2 to the maximum level “5”. At this time, the rotation speed of the convection fan 14 is set to the level "5" (see FIG. 3A).

In step S106, it is determined whether or not (room temperature T − set temperature T ₀ ) exceeds −0.5 ° C. and is 0.0 ° C. or lower. When −0.5 ° C. <(T−T ₀ ) ≦ 0.0 ° C. (Yes in S106), the process proceeds to step S107, and −0.5 ° C. <(T−T ₀ ) ≦ 0.0 ° C. If not (No in S106), the process proceeds to step S108.

Step S107 will be executed when the room temperature T is slightly lower than the set temperature T ₀ . In step S107, the control unit 20 sets the thermal power of the burner unit 2 to the level “4”. At this time, the rotation speed of the convection fan 14 is set to the level "4" (see FIG. 3A).

In step S108, it is determined whether or not (room temperature T-set temperature T ₀ ) exceeds 0.0 ° C. and is 0.5 ° C. or lower. When 0.0 ° C. <(T-T ₀ ) ≤ 0.5 ° C. (Yes in S108), the process proceeds to step S109, and when 0.0 ° C. <(T-T ₀ ) ≤ 0.5 ° C. (No in S108), the process proceeds to step S110.

Step S109 will be executed when the room temperature T is slightly higher than the set temperature T ₀ . In step S109, the control unit 20 sets the thermal power of the burner unit 2 to the level “3”. At this time, the rotation speed of the convection fan 14 is set to the level "3" (see FIG. 3A).

In step S110, it is determined whether or not (room temperature T-set temperature T ₀ ) exceeds 0.5 ° C. and is 1.0 ° C. or lower. When 0.5 ° C. <(T-T ₀ ) ≤ 1.0 ° C. (Yes in S110), the process proceeds to step S111, and when 0.5 ° C. <(T-T ₀ ) ≤ 1.0 ° C. (No in S110), the process proceeds to step S112.

Step S111 will be executed when the room temperature T is slightly higher than the set temperature T ₀ . In step S111, the control unit 20 sets the thermal power of the burner unit 2 to the level “2”. At this time, the rotation speed of the convection fan 14 is set to the level "2" (see FIG. 3A).

Step S112 is executed when the room temperature T is higher than the set temperature T ₀ by a certain degree or more. In step S112, the control unit 20 sets the thermal power of the burner unit 2 to the minimum level “1”. At this time, the rotation speed of the convection fan 14 is set to the level "1" (see FIG. 3A).

Then, when steps S105, S107, S109, S111, and S112 are completed, the process returns to step S103.

Next, energy-saving operation will be described.
As shown in FIG. 6, in step S201, the control unit 20 acquires the set temperature T ₀ set by the temperature setting unit 17a.

In step S202, the control unit 20 sets the thermal power of the burner unit 2 to the maximum level “4” in the energy-saving operation, and operates the heating device 100. At this time, the rotation speed of the convection fan 14 is set to the level "5" (see FIG. 3B). Then, the room temperature T rises as the operation of the heating device 100 is continued.

Then, in step S203, it is determined whether or not the room temperature T has reached the set temperature T ₀ . If the room temperature T has not reached the set temperature T ₀ (No in S203), the process waits in step S203. When the room temperature T reaches the set temperature T ₀ (Yes in S203), the process proceeds to step S204.

In step S204, the control temperature Tc is set. Here, the control temperature Tc is used as a general term for the first control temperature T ₁ , the second control temperature T ₂ , and the third control temperature T ₃ described above. The control temperature Tc is set based on the pattern of change of the correction value with respect to the set temperature T ₀ shown in FIG. As a result, the fluctuation temperature control operation is performed.

In step S205, the room temperature T is detected by the room temperature detecting means 18. Subsequently, in step S206, it is determined whether or not (room temperature T-control temperature Tc) is 0.5 ° C. or lower. When (T-Tc) ≤ 0.5 ° C. (Yes in S206), the process proceeds to step S207, and when (T-Tc)> 0.5 ° C. (No in S206), the process proceeds to step S208. move on.

Step S207 will be executed when the room temperature T is slightly higher than the control temperature Tc or is lower than a certain degree. In step S207, the control unit 20 sets the thermal power of the burner unit 2 to the maximum level “4” and operates the heating device 100. At this time, the rotation speed of the convection fan 14 is set to the level "5" (see FIG. 3B).

In step S208, it is determined whether or not (room temperature T-control temperature Tc) exceeds 0.5 ° C. and is 1.0 ° C. or lower. When 0.5 ° C. <(T-Tc) ≤ 1.0 ° C. (Yes in S208), the process proceeds to step S209, and when 0.5 ° C. <(T-Tc) ≤ 1.0 ° C. (S208). No), the process proceeds to step S210.

Step S209 will be executed when the room temperature T is slightly higher than the control temperature Tc. In step S209, the control unit 20 sets the thermal power of the burner unit 2 to the level “3”. At this time, the rotation speed of the convection fan 14 is set to the level "3" (see FIG. 3B).

In step S210, it is determined whether or not (room temperature T-control temperature Tc)) exceeds 1.0 ° C. and is 1.5 ° C. or lower. When 1.0 ° C. <(T-Tc) ≤1.5 ° C. (Yes in S210), the process proceeds to step S211 and when 1.0 ° C. <(T-Tc) ≤1.5 ° C. (S210). No), the process proceeds to step S212.

Step S211 will be executed when the room temperature T is higher than the control temperature Tc to some extent. In step S211 the control unit 20 sets the thermal power of the burner unit 2 to the level “2”. At this time, the rotation speed of the convection fan 14 is set to the level "2" (see FIG. 3B).

Step S212 will be executed when the room temperature T is higher than the control temperature Tc to some extent or more. In step S212, the control unit 20 sets the thermal power of the burner unit 2 to the maximum level “1”. At this time, the rotation speed of the convection fan 14 is set to the level "1" (see FIG. 3B).

Then, when steps S207, S209, S211 and S212 are completed, the process returns to step S204.

As shown in FIG. 7, when the energy-saving operation is executed, when the room temperature T is lower than the set temperature T ₀ , combustion is performed at the maximum level of the thermal power in the energy-saving operation, and the room temperature T rises. At this time, since the rotation speed of the convection fan 14 is controlled to be high, warm air is strongly blown out. Further, when the room temperature T reaches the set temperature T ₀ , the fluctuation temperature is adjusted so that the room temperature T fluctuates between the vicinity of the set temperature T ₀ and the predetermined temperature lower than the set temperature T ₀ (near the control temperature Tc). Driving is done.

As described above, the heating device 100 according to the present embodiment includes a control unit 20 that controls the thermal power of the burner unit 2 based on the difference between the set temperature T ₀ and the detected room temperature T. Then, the control unit 20 executes a normal operation and an energy-saving operation in which the maximum level of the thermal power of the burner unit 2 is smaller than that of the normal operation. Further, the rotation speed of the convection fan 14 corresponding to the thermal power of the burner unit 2 at a predetermined level or higher in the energy-saving operation is made larger than the rotation speed of the convection fan 14 corresponding to the thermal power in the normal operation equal to the thermal power.

In such a configuration, when the thermal power of the burner portion 2 is equal to or higher than a predetermined level in energy-saving operation, the room temperature T is in a state of being low to some extent, but warm air is generated by increasing the rotation speed of the convection fan 14 to increase the air volume. It can be blown out strongly. For this reason, the warm air blown out does not rise immediately in the room, but reaches the feet, and the temperature near the feet rises. Then, this warm air rises from the vicinity of the floor to the ceiling and convection. Therefore, in the energy-saving operation, the maximum level of the thermal power of the burner portion 2 is made smaller than that in the normal operation to save the amount of fuel used, and the effect of warming the entire room faster is brought about.
Further, since the rotation speed of the convection fan 14 is increased only when the thermal power of the burner portion 2 is large to some extent, the flame is hardly affected by the air blown by the convection fan, and the combustion state is not deteriorated.
That is, according to the present embodiment, it is possible to provide a heating device 100 capable of energy-saving operation that improves the heating effect while maintaining a good combustion state.

Further, in the present embodiment, when the room temperature T approaches the set temperature T ₀ , the first control using the first control temperature T ₁ lower than the set temperature T ₀ and the second control temperature T equal to the set temperature T ₀ The process including the second control using ₂ is repeatedly executed.

In such a configuration, the fluctuation temperature control operation is performed so as to fluctuate the room temperature T. When such a fluctuation temperature control operation is executed, the room is sufficiently warmed up to the set temperature T ₀ , so that the amount of fuel used can be reduced without impairing the feeling of heating even if the heating power drops a little. You can save.
Further, in the fluctuation temperature control operation, when shifting from the first control to the second control, the second control temperature T ₂ which is usually higher than the room temperature controlled by using the first control temperature T ₁ is used. As a result, the thermal power of the burner portion 2 increases and the rotation speed of the convection fan 14 increases repeatedly. Therefore, the way the warm air reaches the room changes and the air in the room is agitated, so that the room temperature is made uniform and the heating effect can be further improved. As a result, even if the first control temperature T ₁ is set to be lower than the set temperature T ₀ to some extent, the heating effect can be ensured, and the amount of fuel used can be further saved.

Further, in the present embodiment, the rotation speed of the convection fan 14 corresponding to the thermal power of the maximum level "4" of the burner unit 2 in the energy-saving operation is equal to the thermal power of the convection fan 14 corresponding to the thermal power "4" in the normal operation. It is larger than the rotation speed of 14.

In such a configuration, the rotation speed of the convection fan 14 is increased in the energy-saving operation only when the thermal power of the burner portion 2 is at the maximum level. Therefore, the flame is less susceptible to the influence of the air blown by the convection fan 14, and the combustion state is less affected. Moreover, since the thermal power of the burner portion 2 is at the maximum level, it does not feel cold even if the air volume of warm air increases.

Further, in the present embodiment, the rotation speed of the convection fan 14 corresponding to the thermal power of the burner unit 2 above the predetermined level in the energy-saving operation is the rotation speed of the convection fan 14 corresponding to the maximum level "5" of the thermal power in the normal operation. Equal to speed.

In such a configuration, the rotation speed of the convection fan 14 corresponding to the maximum level "5" of thermal power in normal operation is generally the maximum rotation speed used by the convection fan 14 of the heating device 100. Therefore, the rotation speed of the convection fan 14 can be sufficiently increased within the range normally used to blow out warm air strongly.

Although the present invention has been described above based on the embodiment, the present invention is not limited to the configuration described in the embodiment. The present invention can appropriately change the configuration within a range not deviating from the gist thereof, including appropriately combining or selecting the configurations described in the above-described embodiment. In addition, a part of the configuration of the embodiment can be added, deleted, or replaced.

For example, in the above-described embodiment, the rotation speed of the convection fan 14 corresponding to the thermal power of the maximum level “4” of the burner unit 2 in the energy-saving operation is increased. However, the present invention is not limited to this. For example, the rotation speed of the convection fan 14 corresponding to each of the maximum level "4" and the level "3" thermal power of the burner unit 2 in the energy-saving operation may be increased.

Further, in the above-described embodiment, the rotation speed of the convection fan 14 increased in the energy-saving operation is equal to the rotation speed "5" of the convection fan 14 corresponding to the maximum level "5" of the thermal power in the normal operation. However, the present invention is not limited to this. For example, the rotation speed of the convection fan 14 increased in the energy-saving operation may be at a level between "4" and "5", or higher than "5".

Further, in the above-described embodiment, the case where the thermal power level is in five stages from “1” to “5” has been described, but the five stages are exemplary and may be appropriately changed and set.

Further, in the above-described embodiment, the heating device 100 includes a combustion fan 10, but the present invention is not limited to this, and the present invention can be applied to a heating device that does not include the combustion fan 10.

1 Main unit 2 Burner unit 14 Convection fan 17 Operation unit 17a Temperature setting unit 18 Room temperature detection means 20 Control unit 100 Heating device T Room temperature T ₀ Set temperature T ₁ First control temperature T ₂ Second control temperature

Claims (4)

The main body that forms the outer frame and
A burner unit that is arranged inside the main body and burns vaporized fuel oil,
A convection fan, which is arranged inside the main body and exchanges heat with the combustion gas generated by combustion of the burner portion and discharges the air taken from the outside of the main body to the outside of the main body.
The temperature setting unit that sets the set temperature and
Room temperature detection means to detect room temperature and
A control unit that controls the thermal power of the burner unit based on the difference between the set temperature and the detected room temperature is provided.
The control unit executes normal operation and energy-saving operation in which the maximum level of the thermal power of the burner unit is smaller than that of the normal operation.
The control unit sets the rotation speed of the convection fan corresponding to the thermal power of the burner unit at a predetermined level or higher in the energy-saving operation to the rotational speed of the convection fan corresponding to the thermal power in the normal operation equal to the thermal power in the energy-saving operation. A heating device characterized by being larger than. In the energy-saving operation, the control unit sets the first control temperature lower than the set temperature and the detected room temperature after the difference between the set temperature and the detected room temperature becomes equal to or less than the predetermined temperature difference. The first control that controls the thermal power of the burner unit based on the difference, the second control that controls the thermal power of the burner unit based on the difference between the detected room temperature and the second control temperature equal to the set temperature, and The heating device according to claim 1, wherein the process including the above is repeatedly performed. The heating device according to claim 1 or 2, wherein the thermal power of the burner portion or more in the energy-saving operation is the maximum level thermal power of the burner portion in the energy-saving operation. The control unit shall make the rotation speed of the convection fan corresponding to the thermal power of the burner unit equal to or higher than the predetermined level in the energy-saving operation equal to the rotation speed of the convection fan corresponding to the maximum level of the thermal power in the normal operation. The heating device according to any one of claims 1 to 3, wherein the heating device is characterized.

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