EP0949455A1 - Heating device with turbo stage - Google Patents

Abstract

The heating unit has a bypass valve (7) with a solenoid operating unit (8), which is coupled with a fan (9), is arranged in a bypass to the fuel supply line (5), upstream from burner stages (1,2). Thus when increased heating power is required, an increased fuel supply to the burner stages results by the opening of the bypass valve by the solenoid. The bypass valve is only operable, if the fan is in operation. The throttle element is arranged in the fuel supply line, before its branching to the burner stages, outside from the bypass.

Description

The invention relates to a heater provided with a turbo stage, in particular for mobile homes, caravans etc. according to the preamble of claim 1.

The known heaters used for campers, caravans, etc. have one Heat exchanger on and are with at least one burner device and a valve for controlling the fuel supply to a pilot burner. The burner device generally has two burner stages and is operated by a fuel supply line supplied with fuel from the ignition safety valve, the fuel being dependent on an adjustable throttle element is supplied by the heat requirement of the room to be heated.

From DE 19 539 869 A1 a gas burner is known which consists of a modulating gas solenoid valve, a two-part or multi-part gas nozzle plate for Formation of at least two burner stages, Venturi tubes and a burner surface consists. The outgoing from the modulating gas solenoid valve The gas line is connected directly to one of the gas nozzle plates. One branching off Contains supply line to the gas nozzle plate of the second burner stage another, non-modulating solenoid valve. By doing this further If the solenoid valve is opened or closed, the gas solenoid valve acts either to both burner stages or only to one burner stage.

In the company brochure "630 EUROSEAT PLUS" from SIT Group is a for Gas valve used in the boiler. This gas valve has two independent gas outlets, one controlled by a thermostat Main outlet and a manually controlled auxiliary outlet. The auxiliary outlet will open set a certain value, on which it is usually during a longer time period remains, the regulation only by means of Thermostats for the main outlet. In addition, in the above Company brochure described a version in which the gas valve only one Has outlet, the thermostat control of the main outlet from the manual control of the auxiliary outlet is superimposed. Using the auxiliary outlet the supply of additional fuel can be realized; a regulation by means of the thermostat, however, is only for those via the main outlet skipped normal amount of fuel possible.

From DE 196 23 239 is a two-stage gas burner for use in houses or Apartments with a first modulating level and a second constant Stage known. The second stage is parallel to the first via a solenoid valve Stage switched and can be switched on and off.

EP 0 818 655 discloses an apparatus for the controlled reduction of one Gas flow, which is a burner nozzle of a gas-operated cooking or Baking device is supplied via a gas supply line. The gas supply line is in one Number of partial gas lines branched, which are connected in parallel to each other and via which partial gas flows can be fed to the burner nozzle. The device further includes control elements with switching elements for optional input and Switching off the respective partial gas flows and throttle elements for throttling the respective partial gas flows.

In contrast, the object of the invention is to provide a heater by means of which a rapid heating-up time can be realized, which is an exact and reliable control of the heating output of the at least two burner stages also in Range of a heating output greater than the normal output and which is also inexpensive to manufacture.

This object is achieved by a heater with the features of claim 1 solved. Appropriate developments are in the dependent claims Are defined.

The heater according to the invention is used in particular for campers, caravans etc. used. It is with a heat exchanger, with at least one Burner device and at least two burner stages and a valve for Provide control of the fuel supply to a pilot burner. The fuel the burner device via a fuel supply line from the valve preferably a fixed throttle and by means of an adjustable throttle element in Depending on the heat demand of the room to be heated. According to the invention, the valve has a bypass valve with a Actuator on. The bypass valve is in a bypass to the Fuel supply line upstream of the at least two burner stages arranged, being larger than normal in the event of heating power being required Power the fuel supply to the burner stages by opening the bypass valve is increased by means of the actuating device. The adjustable Throttle element is in the fuel supply line before branching, however outside the bypass and after a branch from the Fuel supply line arranged to the pilot burner.

The increase in the fuel supply when the power requirement exceeds the normal power is also referred to as turbo heating mode. In this context is understood by normal power the power which the heat exchanger of the heater can be transferred by free convection without a fan is switched on. This maximum by free convection through the Heat exchanger transferable performance represents a 100% performance which the Sum of those generated by the burner stages and by the pilot burner Total performance includes. When the turbo heating is operating, this becomes 100% performance exceeded, by means of the heat exchanger this greater output (greater than 100% power) cannot be transferred by free convection alone. This is a Blower required.

A major advantage of the heater according to the invention is, among other things in that the burner device by means of a single bypass valve including the at least two burner stages so controllable or with one corresponding amount of fuel can be acted on, that even when the Heater in turbo heating mode has a higher output than the 100% output the room to be heated can be delivered and also in this Power range an exact regulation of the heating power is possible. The regulation the at least two burner stages do not take place by adding or Switching off a single burner stage to achieve a higher output than the 100% performance, as is the case in the prior art, but by Operation and control of all burner levels in the entire performance range including performance in turbo heating mode.

The burner device is preferably designed with two burners, the two burners form a first and a second burner stage. About the Fuel supply line, the two burners are supplied with fuel. If the need for heating output greater than the normal output compared to the 100% output requires higher fuel supply, the bypass valve is opened so that the first and second burner stages burn so much fuel that one Power greater than the normal power can be achieved, even then one Room temperature-based control of the heating output in turbo heating mode he follows. An advantage of designing the burner device with two of them separate burners is that in the event of a possibly occurring In the event of failure, only the defective burner must be replaced.

According to a further exemplary embodiment, the burner device is as one two-stage burner provided, the first and the second Burner stage in the burner device are integrated in the burner. This will created a particularly compact burner device. Regardless of whether the Burner device has two separate burners or whether the first and the second Burner stage are integrated within one burner, both burner stages Always charged with fuel in the entire possible performance range. Means The bypass valve ensures that the action of the individual Burner with a heating power requirement greater than the normal power with more Fuel takes place so that the greater heating capacity, i.e. the turbo heating mode, is feasible.

According to a further exemplary embodiment, the heater also has Blower on, which is coupled to the actuator so that the Bypass valve can only be actuated if the fan is at least for a heating output is in operation above normal power. With a heating power requirement smaller or equal to 100% power, it is not necessary for the blower to operate becomes. The heat exchanger is therefore preferably dimensioned such that it is in is able to achieve normal power, i.e. the 100% performance transfer. If a heating output greater than the normal output is to be transferred, it is therefore necessary that the blower be in operation. In that the actuator is coupled to the blower, it is thus ensured that the Bypass valve only opens and the two burner stages only then additional Supports fuel when the blower is operating. This makes it possible for Heater even with turbo heating a smaller sized heat exchanger provide and still ensure that this heat exchanger in Turbo heating mode is not overloaded.

The fan and / or the actuating device are preferably manual actuatable. However, it is also possible that the blower and / or the Actuator automatically based on a heat demand signal can be operated. The heat demand signal is via a temperature sensor in connection with a temperature to be set of the to be heated Room determined and as a control signal for the coupled to the blower Actuator used.

Preferably the burner device is atmospheric or blower assisted Burner device trained.

According to a further embodiment, the lines and nozzles are the burner stages and thus the burner stages themselves dimensioned and arranged so that both Burner stages have an essentially equal proportion of heating power apply. This makes it possible for the overall burner device to be modular build up what is not just a replaceability in the event of a repair, but also increases the possibility of a wide range of heating power through the Provide multiple burners arranged in parallel. This in heating output of the respective burner stages is essentially the same realized for example via a fixed throttle at the fuel outlet. This the The actual nozzle-forming fixed throttle is as a flow orifice or as itself tapered tube tip formed on the fuel line. The tapered one Pipe tip is preferably as a conical, inwardly curved, sections conical or cylindrical outlet, or as a slot nozzle or as a nozzle with a star shape arranged multiple slot formed.

Furthermore, according to a development of the invention, it is provided that To change the throttle element by means of a signal from a temperature sensor so that the heat requirement of the room to be heated is adjustable, the Throttle element in the fuel supply line upstream of the branch to the individual burner stages, but is provided outside the bypass. It is however, also possible, before each burner stage, especially if the Burner device consists of two different burners, one in cross section to arrange changeable throttle element.

The actuating device is preferably a solenoid valve. This is especially for the automatic control or the automatic actuation of the Bypass valve is an advantage.

According to yet another exemplary embodiment of the invention, the valve has Control of the fuel supply on an additional solenoid valve, which as Bypass is arranged and when there is no power supply, either due to failure or due to the lack of the possibility of connecting the fuel to the fuel supply Pilot burner and to the two burner stages via the fuel supply line releases.

Fig. 1

eine prinzipielle Schaltungsanordnung gemäß der Erfindung für eine Turboheizung in Standardausführung;

Fig. 2

eine prinzipielle Schaltungsanordnung eines zweiten Ausführungsbeispiels gemäß der Erfindung für eine Turboheizung mit automatischer Betätigung;

Fig. 3

ein Zündsicherungsventil in Unteransicht für eine Turboheizung mit automatischer Betätigung gemäß dem zweiten Ausführungsbeispiel (siehe Fig. 2);

Fig. 4

eine Anordnung der Festdrossel, des Bypass-Ventils und der Brennstoffzufuhrleitung in vergrößerter Teilschnittansicht in geschlossener Stellung;

Fig. 5

die Ansicht gemäß Fig. 4, jedoch in geöffneter Stellung;

Fig. 6

eine Seitenschnittansicht des Zündsicherungsventils gemäß Fig. 3;

Fig. 7

eine vergrößerte Teilschnittansicht des zusätzlichen Magnetventils in geschlossener Stellung;

Fig. 8

eine vergrößerte Teilschnittansicht gemäß Fig. 7, jedoch in geöffneter Stellung;

Fig. 9a)

eine herkömmliche Festdrossel am Zündbrenner;

Fig. 9b)

eine herkömmliche Festdrossel der Brennereinrichtung (erste und zweite Brennerstufe); und

Fig. 10

Ausführungsbeispiele der Ausbildung der Rohrspitze an der jeweiligen Brennerstufe.

Further advantages, features and possible applications of the invention are explained in detail below with reference to the accompanying drawings. Show it:

Fig. 1

a basic circuit arrangement according to the invention for a turbo heater in a standard design;

Fig. 2

a basic circuit arrangement of a second embodiment according to the invention for a turbo heater with automatic actuation;

Fig. 3

an ignition fuse valve in bottom view for a turbo heater with automatic actuation according to the second embodiment (see Fig. 2);

Fig. 4

an arrangement of the fixed throttle, the bypass valve and the fuel supply line in an enlarged partial sectional view in the closed position;

Fig. 5

the view of Figure 4, but in the open position.

Fig. 6

a side sectional view of the ignition safety valve according to FIG. 3;

Fig. 7

an enlarged partial sectional view of the additional solenoid valve in the closed position;

Fig. 8

an enlarged partial sectional view of FIG 7, but in the open position.

9a)

a conventional fixed throttle on the pilot burner;

Fig. 9b)

a conventional fixed throttle of the burner device (first and second burner stage); and

Fig. 10

Embodiments of the design of the pipe tip at the respective burner stage.

Fig. 1 shows a circuit diagram provided for a standard turbo heater Ignition protection valve. The turbo heater has a first burner stage 1 and one second burner stage 2 and a pilot burner 3. An ignition safety valve 4 is constructed so that the fuel supply via a pilot burner line 24 to Pilot burner 3 after opening a main valve 12 with the ignition fuse 13 open is possible. In addition, the ignition fuse valve 4 via a Fuel supply line 5 the supply of fuel, which is a fuel source 16 is taken to the first burner stage 1 and the second burner stage 2 realized. In normal operation, the fuel is supplied via the Fuel supply line 5 to the first burner stage 1 and the second burner stage 2 such that both burner stages have a maximum total heating power equal to 100% power minus the power of the pilot burner, which delivers approx. 10% (Normal power + ignition power = 100%). A fundamental advantage of Turbo heating shown in Fig. 1 is that when the fan is on a bypass valve 7, which is arranged in a bypass 26 and by means of a Actuator 8 opened and closed in the form of a switching magnet will, i.e. the bypass valve 7 is designed as a solenoid valve, it enables that the fuel supply to the first burner stage 1 and the second burner stage 2 can be increased so that the heat output achievable by the two burner stages is greater than the 90% performance.

The basic mode of operation of that described in FIG. 1 is described below Turbo heater described in the standard version with the ignition protection valve 4. For manual operation are a main valve 12, a push rod 15 and so connected a control piston 14 is provided. By turning the push rod 15 is The main valve 12 is opened via a cam, not shown, so that Fuel from the fuel source 16 through the main valve 12 into the portion of the Fuel supply line 5 can flow to an ignition fuse 13. The Ignition fuse 13 interrupts the fuel supply to the pilot burner 3 Pressing the push rod 15, the fuse 13 is opened, however, so that the Fuel reaches the pilot burner 3. A control piston 14 closes at the same time the fuel supply to the first burner stage 1 and the second burner stage 2. The fuel flows through the ignition fuse 13 thus opened Pilot burner line 24 through a pilot burner nozzle into the pilot burner 3. The Pilot burner nozzle is designed as a pilot burner fixed throttle 22 and for one Output of approx. 10% of the total output of the heater.

In addition to the possibility of closing the push rod 15 to open the ignition fuse 13 press, it is possible to rotate the push rod 15. By turning the Push rod 15, an igniter, not designated, is activated, with a also not designated spark plug the fuel is ignited. This is an ignition flame is present on the pilot burner 3. On the pilot burner 3 is a Thermocouple 19 installed, which supplies a voltage signal to the ignition fuse 13 to keep open.

If the push rod 15 is no longer pressed, the control piston 14 opens the Fuel supply to the first burner stage 1 and the second burner stage 2. By turning the push rod 15, the control piston 14 is in a defined Position brought, this defined position of the release of a defined Cross section corresponds to the passage of a defined amount of fuel, so that the respective position of the control piston 14 of a desired room temperature corresponds to the room to be heated. The room temperature is controlled via an adjustable throttle element 6 in the form of an expansion element, e.g. a bellows as well as a temperature sensor connected to it 10. Based on the signal provided by temperature sensor 10 with the respective position of the achieved by turning the push rod 15 Control piston 14, the fuel supply to the first burner stage 1 and second burner stage 2 regulated. The ignition fuse valve 4 includes the further a fixed choke 20. This fixed choke 20 is dimensioned so that maximum such an amount of fuel can flow through, which to generate the 90% power through the first burner stage 1 and the second burner stage 2 is required. In the present example, this fixed choke is based on a power of 90% set.

Since the heat exchanger of the heater with free convection, i.e. at not blower 9 switched on, a maximum heating output of Normal power, i.e. that can transmit 100% power is the bypass valve 7 closed, so that the fixed throttle 20 not rated at 90% heating power is avoidable. If the heater is to be operated in turbo heating mode, i.e. if a heating power requirement is desired which is greater than the 90% power is, after the blower 9 is switched on or when the Blower 9 by means of a switch 17, the actuator 8 in the form of a Magnet insert is activated, whereby the bypass valve 7 in its open position is switched. This bypasses the fixed throttle 20, and a larger one than that through the fixed throttle 20 possible amount of fuel can on the Fuel supply line 5 to the first burner stage 1 and the second burner stage 2 arrive. According to this embodiment, it is possible to increase the heating power to increase about 170%.

The coupling of the actuation of the bypass valve 7 with the switching on of the Blower 9 is required so that the heat exchanger when supplying fuel is not overloaded, by means of which a heating output greater than 100% output is achievable. In addition, this safety circuit has between Operation of the blower and open position of the bypass valve 8 the advantage that Heat exchanger can be dimensioned smaller, i.e. for a heating output is dimensioned, which corresponds to the 100% performance.

Immediately at the entrance to the first burner stage 1 and the second burner stage 2 one burner choke 21 each. These burner chokes 21 are also fixed setting, each choke set to a heating output of about 85% is. However, it is also possible, depending on the dimensioning of the respective Burner stage that the burner chokes 21 are set differently. Through the Coupling of fan operation and activation of the bypass valve in the The heat exchanger is therefore protected against overheating in the open position.

In Fig. 2 is a basic circuit arrangement of a heater according to the Invention for a turbo heater with automatic actuation shown. The The principle of operation corresponds to that which is used in conjunction with FIG. 1 has been described above. In this second embodiment of the The ignition protection valve 4 has an additional solenoid valve 11. The additional solenoid valve 11 is actuated by a timer 18. The Actuation of the additional solenoid valve 11 by means of the timer 18 is only possible after the desired by rotating the push rod 15 Room temperature has been set. This also becomes the main valve 12 open. The fuel can thus go to pilot burner 3 and the first Flow burner stage 1 and the second burner stage 2. The ignition takes place through a not known and not shown, known automatic firing devices.

The advantage of this second embodiment is i.a. in that the Heater by an electrical signal, which is supplied by the timer 18, can be started. This makes it possible to use the heater independently of the otherwise required manual operation at a desired time automatically put into operation. Depending on the heating power requirement, this can Heater for normal operation, i.e. up to a maximum heating output in height 100% power, or the heater can be in the turbo heating mode after switching on via the signal from the timer 18 be operated if there is a heating power requirement that is greater than that 100% performance is. The entire basic function otherwise corresponds to that described according to the first embodiment of FIG. 1.

3 is a bottom view of an ignition safety valve with an additional one Solenoid valve 11, i.e. with automatic actuation according to the second Embodiment (see Fig. 2) shown. 3 is the temperature sensor 10 partially shown, which the ignition safety valve delivers a signal to an adjustable throttle element 6 (not shown). Next the additional solenoid valve 11 is the bypass valve 7 with the Actuator 8 shown, which is designed as a magnetic insert, i.e. both the actuator 8 and the actuator 11 are as Magnetic inserts formed. The position of the bypass valve shown corresponds the closed position. In the closed position, the Fuel supply to the individual burner stages from the fuel supply line 5 via the fixed throttle 20 to the burner nozzles. In the upper outlet of the 3 is the main valve 12 with its seat indicated.

In Fig. 4 is an enlarged partial sectional view of the marked in Fig. 3 Area shown the closed position of the bypass valve 7. In the closed position, the fuel is used as the main flow channel trained fuel supply line 5 only through the fixed throttle 20 in the Connector of the fuel supply line to the burner nozzle (not shown) Burner device 1, 2 out. The fact that the bypass valve 7 in its closed position, no additional fuel of the burner device be fed.

FIG. 5 shows the enlarged partial sectional view according to FIG. 4, but with the bypass valve 7 in its open position. In the open position, the flows Fuel directly via a duct designed as a bypass duct (bypass 26) into the connecting part of the burner device 1, 2 leading fuel supply line 5. The head of the piston Bypass valve 7 has an annular sealing element (not designated). This annular sealing element forms when the bypass valve 7 in its closed Is an annular sealing line, so that fuel is only through the Fixed throttle 20 and from there in the connecting piece to the burner nozzles respective burner device flows.

6 is a side sectional view of the ignition safety valve shown in FIG. 3 shown. The push rod 15 is located in the upper part of the ignition safety valve 4 indicated. By pressing the push rod 15 when the The heater fuse 13 opened, so that fuel on the Pilot burner line 24 can reach pilot burner 3, and control piston 14 is brought into the forward position so that fuel which is from the Fuel source 16 flows into the fuel supply line 5 to Burner device 1, 2 can reach. By turning the push rod 15 that Main valve 12 opened to a passage cross section, by means of which in Connection to the temperature sensor 10, which is partially shown, the desired temperature of the room to be heated is set and controlled.

In a manner known per se, the ignition safety valve 4 is in the form of a Bellows 23 formed expansion element. This expansion element is connected to the control piston 14. The control piston 14 is used the lower end of which opens, changes or closes a throttle cross section 6, the throttle cross section 6 of the throttle element depending on the desired heating output (relatively rough) is regulated.

The ignition safety valve 4 also has two fuel lines that Fuel supply line 5, which leads to the burner device 1, 2, and Pilot burner line 24, which supplies fuel to the pilot burner 3. The front one Range of pilot burner output 24, which is denoted by a circle with X. (see Fig. 9a)) is designed as a pilot burner throttle 22. The front area the fuel supply line 5, which is denoted by a circle with Y (see 9b)) is designed as a burner choke 21. The burner throttle 21 is used to supply only such an amount of fuel to the burner device 1, 2, that their maximum heating power according to the design condition for this Embodiment is limited to about 170% of normal power, the 170% power the maximum possible, achievable heating power of all Burner stages.

The actual ignition fuse 13 is located in the lower part of the ignition fuse valve 4 shown. After pressing the push rod 15, the ignition fuse 13 has been opened and fuel flows to pilot burner 3 and ignited there a voltage signal is generated by means of a thermocouple 19 and on the ignition fuse 13 is supplied, on the basis of which the ignition fuse 13 is kept open so that fuel is always in the pilot burner line 24 to Pilot burner 3 flows.

In this side sectional view of the ignition safety valve 4 according to FIG. 6 is also the additional solenoid valve 11 is shown in a sectional view. This additional Solenoid valve 11, the opening and closing cross section in the Z indicated circle is used for automatic control of the Ignition protection valve. This additional solenoid valve 11 has one Magnet insert, by means of which a piston depending on, for example the signal of a timer 18 (see Fig. 2) brought into an open position is so that when the main valve 12 fuel from the Fuel source 16 via the opening cross section in the additional solenoid valve 11 bypassing the manually operated ignition fuse 13 the Pilot burner 3 and into the fuel supply line 5 to the burner device 1, 2 is feedable.

FIG. 7 is an enlarged partial sectional view of area Z according to FIG. 6 shown. In Fig. 7, the closing piston of the additional solenoid valve 11 is in the closed position. 8 is, however, in the same partial sectional view as Fig. 7 of the closing piston of the additional solenoid valve 11 in the open position shown. The basic arrangement of this additional solenoid valve 11 is shown in Fig. 2 shown. From Fig. 8 it can be seen that with the piston open the additional Solenoid valve 11 fuel both in the pilot burner line 24 to the pilot burner 3 and flow into the fuel supply line to the burner device 1, 2 can.

In FIG. 9 a), the pilot burner throttle 22 is in shape according to an exemplary embodiment shown a flow orifice. This flow orifice has one in the middle Opening a defined size, which the actual pilot burner throttle 22nd represents. The fuel flowing into the pilot burner line 24 is there Pilot burner throttle 22 throttled so far that a maximum of 10% of the pilot burner 3 total heating power can be generated.

9b) shows a burner choke 21 in an enlarged sectional view, which is designed in the form of a flow orifice. This flow orifice has an opening in the central area, which is the actual burner choke 21 shown. The size of this opening is such that that in the Fuel supply line to the fuel flowing to the burner device is throttled that the total heating output is approx. 170% (in turbo operating mode) will not be exceeded. For heaters that are not for one Turbo operating mode are provided, this burner choke is dimensioned so that the total output of all burner stages is 90% of the total heating output of the heater does not exceed, whereby approx. 10% output is realized for the pilot burner.

10 is a further embodiment for burner chokes or Pilot burner chokes shown. According to this embodiment, this is the actual end of the fuel supply line or the burner nozzle Pilot burner line as a conical pipe section with an essentially cylindrical front portion formed. The burner choke or Pilot burner throttle is designed as a pipe tip of a defined configuration. In addition to the pipe tip shown, which consists of a tapered section and a cylindrical section, it is also possible that the pipe tip in a curved configuration is reduced to the throttle opening cross section or that the burner nozzle as a conical outlet or as a slot nozzle or as star-shaped slot nozzle is formed. The shape, size and The design of the pipe tip depends on the desired throttling effect for the respective burner stage and also after influencing one in a targeted manner calm and optimal flame formation in the individual burner stages.

Claims (14)

Heater, in particular for campers, caravans etc., with a heat exchanger, with at least one burner device and at least two burner stages (1, 2) and with a valve (4) for controlling the fuel supply to a pilot burner (3) and the burner device, the Burner device can be supplied with fuel from a fuel supply line (5) from the valve (4) via a throttle (20) and the fuel can be supplied by means of an adjustable throttle element (6) depending on the heat requirement,
characterized in that a bypass valve (7) with an actuating device (8), which is coupled to a blower (9), is arranged in a bypass to the fuel supply line (5) upstream of the burner stages (1, 2), by means of which in the case of If the heating output is greater than the normal output, there is an increased fuel supply to the burner stages (1, 2) by opening the bypass valve (7) by means of the actuation device (8), the bypass valve (7) being operable only when the fan (9) is in operation; and the throttle element (6) is arranged in the fuel feed line (5) before it branches to the burner stages outside the bypass. Heater according to claim 1, characterized in that the burner device has two burners, which have a first burner stage (1) and a second Form burner stage (2). Heater according to claim 1, characterized in that the burner device a two-stage burner with a first burner stage (1) and a second burner stage (2). Heater according to one of claims 1 to 3, characterized in that the Heat exchanger is dimensioned so that it has the normal power through free Convection transmits and can be loaded with a higher than normal power is when the fan (9) is in operation. Heater according to one of claims 1 to 4, characterized in that the Blower (9) and / or the actuating device (8) can be actuated manually. Heater according to one of claims 1 to 4, characterized in that the Blower (9) and / or the actuating device (8) on the basis of a heat demand signal can be operated automatically. Heater according to claim 6, characterized in that the burner device designed as an atmospheric or fan-assisted burner device is. Heater according to one of claims 1 to 7, characterized in that the Lines and nozzles of the burner stages (1, 2) are arranged and dimensioned in this way are that the burner stages (1, 2) have a substantially equal proportion to apply heating power. Heater according to one of claims 1 to 8, characterized in that the Throttle element (6) by means of a signal from a temperature sensor (10), by means of which the heat demand of a room to be heated can be determined in Throttle cross section is changeable. Heater according to one of claims 1 to 9, characterized in that the Actuator (8) is a solenoid valve. Heater according to one of claims 1 to 10, characterized in that the Valve has an additional solenoid valve (11), which is in a bypass is arranged and in the absence of a power source, the fuel supply to the pilot burner (3) and the fuel supply line (5) releases. Heater according to one of claims 1 to 11, characterized in that the Throttle (20) is a fixed throttle. Heater according to one of claims 1 to 12, characterized in that Burner stages (1, 2) have a tube tip (25) at their outlet Have fixed throttle. Heater according to one of claims 1 to 13, characterized in that the Pipe tip (25) conical, curved inwards, sections conical or cylindrical or as a slot nozzle or as a nozzle with a star-shaped arrangement Multiple slot is formed.

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