Hot water and / or heating system with a heat pump

Abstract

Hot water and / or heating system (100) with: - an exhaust gas heat exchanger (120) which is in fluid-conducting communication with a discharge unit (113) of a heating device (110) and is arranged in the exhaust gas stream of the discharge unit (113) in such a way as to exchange the amount of heat containing in the exhaust gas stream; - a fluid storage unit (130) which is in fluid-conducting communication with the exhaust gas heat exchanger (120), designed to absorb the amount of heat from the exhaust gas heat exchanger (120) into a fluid contained in the fluid storage unit (130), - a heat pump (140) which is in fluid-conducting connection with the fluid storage tank (130) on the cold side, designed to provide the heat quantity of the fluid of the fluid storage tank (130) to the heating circuit (114) on the warm side of the heat pump (140), and - a three-way valve (150) is interposed in a fluid-conducting connection between the cold side of the heat pump (140) and the fluid storage tank (130), wherein the three-way valve (150) is designed to limit a maximum inlet temperature of the fluid to the cold side of the heat pump (140), characterized in that a storage device (160) is provided which is designed to store the amount of heat generated by the heat pump (140), and the storage device (160) is fluidly connected to the heating circuit (114) and to the warm side of the heat pump (140), so that return water of the heating circuit (114) can be preheated with the flow of the warm side of the heat pump (140) via the storage device (160).

Description

[0001] The invention relates to a hot water and / or heating system with a heat pump.

[0002] Conventional hot water and / or heating systems typically exhibit high exhaust gas temperatures and low efficiency. High exhaust gas heat, in particular, has a detrimental effect and represents an unused energy source. For example, a heating appliance with a heat pump and storage tank is disclosed in DE 10 2014 207 540 A1.

[0003] The invention is based on the objective of overcoming the disadvantage of the prior art at least partially and providing a hot water and / or heating system with an improved efficiency, in particular to structurally and / or functionally improve the aforementioned hot water and / or heating system.

[0004] The problem is solved by a hot water and / or heating system with the features of claim 1. Advantageous embodiments and / or further developments are the subject of the dependent claims, the description and / or the accompanying figures.

[0005] In summary, and in other words, the invention provides, among other things, a hot water and / or heating system. The hot water and / or heating system can include a heating device. The heating device can have a combustion unit, a heat transfer unit, and / or a discharge unit. The heat transfer unit can be configured to transfer the heat generated by the combustion unit to a heating circuit. The discharge unit can be configured to discharge an exhaust gas stream generated by the combustion unit. The discharge unit can be an exhaust gas discharge unit. Furthermore, the hot water and / or heating system can include an exhaust gas heat exchanger. The exhaust gas heat exchanger can be in fluid-conducting communication with the discharge unit of the heating device and / or can be arranged in the exhaust gas stream of the discharge unit in such a way as to exchange the heat contained in the exhaust gas stream.The exhaust gas heat exchanger and / or the exhaust unit can be designed such that the exhaust gas is routed through the exhaust gas heat exchanger. The hot water and / or heating system can also include a fluid storage tank. The fluid storage tank can be in fluid-conducting connection with the exhaust gas heat exchanger. The fluid storage tank can be designed to absorb the heat from the exhaust gas heat exchanger into a fluid contained within the fluid storage tank. The fluid storage tank can be a water storage tank, in particular a cold water storage tank. Alternatively, the fluid storage tank can be a gas storage tank. The hot water and / or heating system can also include a heat pump. The heat pump can be in fluid-conducting connection with the fluid storage tank on the cold side. The heat pump can have a so-called cold side and a so-called hot side.The cold side can also be referred to as the inlet side, as in cold inlet side, and the warm side can also be referred to as the outlet side, as in warm outlet side. The heat pump can be configured to transfer the heat from the fluid in the storage tank to the heating circuit on the warm side of the heat pump. This transfer can involve a transformation. The heat from the cold side can be transformed by the heat pump, for example, with the addition of electrical energy, to a higher temperature level on the warm side of the heat pump. The heat pump can be configured to transform the heat from the cold side to a higher temperature level on the warm side, for example, with the addition of electrical energy. The heat pump can also be configured to cool the fluid in the storage tank. The heat pump can, for example, be a water-source heat pump.A fluid can be understood to be either a liquid or a gas. The liquid can be water or a water mixture, for example, a mixture of water and antifreeze. An antifreeze can be or contain alcohol or glycol. A fluid-conducting connection can be understood to be a connection, for example, a pipe and / or a channel, designed to transport a liquid and / or a gas.

[0006] With the design according to the invention, the heat pump can be operated with a higher coefficient of performance (COP). This can result from the advantageous use of the high temperature of the cooling circuit exiting the exhaust gas heat exchanger. Thus, the heat pump can provide a greater quantity of heat, requiring less fuel for combustion. The efficiency can be significantly increased. The exhaust gas heat can be utilized more effectively and optimally. For example, the heat pump can be operated solely with the exhaust gas heat. Energy and raw materials can be saved. This reduces the operating costs of the heating system. Furthermore, fewer climate-damaging emissions and greenhouse gases are released. The energy contained in the exhaust gas, such as residual energy and / or thermal energy, can be used and / or supplied to a heating system via heat transformation in a heat pump.

[0007] In one embodiment of the hot water and / or heating system, the combustion unit is designed as an energy generator for utilizing raw materials. The combustion unit can be a self-contained unit for generating thermal energy by burning fossil and / or renewable natural resources. The usable raw materials can be selected from a group including heating oil, liquefied petroleum gas (LPG), natural gas, hydrogen, coal, pellets, and / or wood.

[0008] In another embodiment of the hot water and / or heating system, the heat pump is powered by electricity from the grid. Alternatively or additionally, the heat pump can be powered by electricity from a photovoltaic system. The hot water and / or heating system can include the photovoltaic system or a photovoltaic array. Key factors for the heat pump are the flow temperature and the heat source itself. A higher source temperature for heat generation by the heat pump makes it easier to transfer thermal energy. Therefore, less energy needs to be supplied to the heat pump at a higher source temperature. The electrical energy supply can be provided via the grid, which may be higher at lower outside temperatures.This alternative design allows electricity to be generated via a photovoltaic system, which is cheaper to produce and emission-free, and enables the heat pump to operate autonomously during the day. Furthermore, the photovoltaic system can include at least one energy storage device: this could be, for example, a battery, a rechargeable battery, or a fluid storage device, such as a vanadium fluid storage system. The photovoltaic system can also include energy storage management, such as battery management. With this energy storage device, the heat pump can operate autonomously even under unfavorable weather conditions or at night.

[0009] In another embodiment of the hot water and / or heating system, a three-way valve is installed in a fluid-conducting connection between the cold side of the heat pump and the fluid storage tank. The three-way valve allows the maximum inlet temperature to the cold side of the heat pump to be limited. This prevents the heat pump from being overloaded at excessively high coefficients of performance (COP).

[0010] In another embodiment of the hot water and / or heating system, a storage device is provided. The storage device can be designed to store the amount of heat generated by the hot water and / or heating system. The storage device can be integrated into the heating circuit and / or connected to the hot side of the heat pump via a fluid-conducting connection. The return water from a heat consumer can be preheated by the supply water from the hot side of the heat pump via the storage device. The storage device can buffer heating heat, which can then be made available to the heat consumers as needed. The storage device for the hot water and / or heating system can, for example, contain water as the storage medium.

[0011] In another embodiment of the hot water and / or heating system, a heating device heat exchanger is provided in the heating circuit. The heating device heat exchanger can be integrated in a fluid-conducting connection between the heating device and a heat consumer. A technical effect resulting from the use of the heating device heat exchanger can be that a separate heating device circuit is created, whose operating medium (e.g., water) is filled according to the system manufacturer's specifications, but not the entire circuit of the heat consumer. This is particularly advantageous in already installed hot water and / or heating systems where the heating device is being replaced.

[0012] In another embodiment of the hot water and / or heating system, a solar thermal system is provided. The solar thermal system may include a solar heat exchanger. The solar thermal system and / or the solar heat exchanger may be in fluid-conducting connection with the fluid storage tank. The solar thermal system and / or the solar heat exchanger may be configured to supply a quantity of heat to the fluid in the storage tank. The solar thermal system and / or the solar heat exchanger may be in fluid-conducting connection with the cold side of the heat pump. The solar thermal system and / or the solar heat exchanger may be configured to supply a quantity of heat to the cold side of the heat pump. By incorporating a solar thermal system, the quantity of heat generated by the heat pump can be increased. The solar thermal system and / or the solar heat exchanger may be integrated into the fluid storage tank on the cold side of the heat pump.By integrating it into the cold side, the solar thermal system and / or the solar heat exchanger can be operated at lower temperatures, which in turn allows heat input even at lower temperatures and with less solar radiation.

[0013] In a further embodiment of the hot water and / or heating system, an environmental energy system is provided. The environmental energy system may include an environmental energy exchanger. The environmental energy system and / or the environmental energy exchanger may be in fluid-conducting connection with the fluid storage tank. The environmental energy system and / or the environmental energy exchanger may be configured to supply a quantity of heat to the fluid of the fluid storage tank. The environmental energy system and / or the environmental energy exchanger may be in fluid-conducting connection with the cold side of the heat pump. The environmental energy system and / or the environmental energy exchanger may be configured to supply a quantity of heat to the cold side of the heat pump. An additional quantity of heat can be fed into the fluid storage tank on the cold side of the heat pump via the heat exchanger of the environmental energy system.This can increase the heating of the fluid and / or raise the inlet temperature to the cold side of the heat pump.

[0014] In another embodiment of the hot water and / or heating system, the renewable energy system is designed as a geothermal system. Alternatively, the renewable energy system is designed as a groundwater system. In groundwater and / or deep geological layers, the temperature remains above approximately 10 degrees Celsius even in freezing conditions. Therefore, the renewable energy exchanger can preheat the cold water return flow to the heat pump. This reduces costs and the load on the heat pump. The cold water return flow to the heat pump can then be further heated via the fluid storage tank.

[0015] In another embodiment of the hot water and / or heating system, the exhaust gas heat exchanger is formed as a single unit with the combustion unit and / or heating device, and / or the exhaust gas heat exchanger is integrated into the combustion unit and / or heating device. It is possible for the exhaust gas heat exchanger to be integrated directly onto the combustion unit, and / or for the exhaust system to have a minimal design. The exhaust system can be installed on the exhaust gas heat exchanger to discharge the exhaust gas flow. Thus, the exhaust gas heat exchanger no longer needs to be a separate component downstream of the combustion unit, but can be integrated. This makes the hot water and / or heating system, and in particular the heating device, more compact, which reduces construction and maintenance costs.

[0016] The above embodiments and further developments can be combined with one another as appropriate. Further possible embodiments, further developments, and implementations of the invention also include combinations of features of the invention described previously or subsequently with regard to the exemplary embodiments, even if not explicitly mentioned. In particular, a person skilled in the art will also be able to add individual aspects as improvements or additions to the respective basic form of the present invention.

[0017] The following detailed description of the figures provides a non-restrictive account of exemplary embodiments with their features and further advantages, illustrated schematically and by way of example: Fig. 1 a schematic representation of a hot water and / or heating system according to a preferred embodiment; Fig. 2 a further schematic representation of a hot water and / or heating system according to a further preferred embodiment, and Fig. 3 a further schematic representation of a hot water and / or heating system according to a further preferred embodiment.

[0018] The accompanying drawings are intended to provide a further understanding of the embodiments of the invention. They illustrate embodiments and, in conjunction with the description, serve to explain the principles and concepts of the invention. Other embodiments and many of the aforementioned advantages become apparent with reference to the drawings. The elements of the drawings are not necessarily shown to scale. In the figures of the drawing, identical, functionally equivalent, and similarly acting elements, features, and components are to be designated with the same reference numerals unless otherwise specified.

[0019] Fig. Figure 1 shows a schematic representation of a hot water and / or heating system according to a preferred embodiment of the present invention. Fig. Reference numeral 100 denotes the aforementioned hot water and / or heating system. The hot water and / or heating system 100 is designed to supply a quantity of heat to a heat consumer 600. Furthermore, the hot water and / or heating system 100 may also be designed to supply hot water (not shown).

[0020] The hot water and / or heating system 100 comprises a heating device 11.0. The heating device 110 includes a combustion unit 111 for generating heat energy by burning fossil and / or renewable raw materials, such as heating oil, liquefied petroleum gas (LPG), natural gas, hydrogen, coal, pellets, or wood. Furthermore, a heat transfer unit 112 is provided, which is designed to transfer the heat generated by the combustion unit 111 to a heating circuit 114. In an exemplary embodiment, the combustion unit 111 includes a boiler in which water is heated. The heat transfer unit 112, which has a further medium, e.g., a fluid, to which the generated heat is transferred, is routed through this boiler. The heating device 110 also includes a discharge unit 113, which is designed to discharge an exhaust gas stream generated by the combustion unit 111.The discharge unit 113 can be designed as a line for transporting the exhaust gas flow and connects in the in . Fig. In the embodiment shown in Figure 1, the heating device 110 is equipped with a fluid-conducting exhaust gas heat exchanger 120. The exhaust gas flow is discharged, for example, to the environment via the discharge unit 113.

[0021] The exhaust gas heat exchanger 120 is in fluid-conducting communication with the discharge unit 113 of the heating device 110 and is arranged in the exhaust gas stream to exchange the heat contained in the exhaust gas stream. The exhaust gas heat exchanger 120 can be an arrangement of one or more heat exchangers connected in parallel or in series in the exhaust gas stream. The fluid flowing in the exhaust gas heat exchanger 120 absorbs the heat from the exhaust gas stream until it is cooled down. The absorbed heat is then discharged accordingly, e.g., to the fluid storage tank 130.

[0022] The exhaust gas stream is further cooled via the downstream exhaust gas heat exchanger 120, and the heat recovered in this process is fed into a fluid storage tank 130 or transferred to a fluid within the fluid storage tank 130. The fluid storage tank 130 is in fluid-conducting communication with the exhaust gas heat exchanger 120 and contains the fluid. A separate heat transfer circuit is provided for heating the fluid in the fluid storage tank 130.

[0023] The heat stored in the fluid storage tank 130 is fed into the cold side of the heat pump 140. The heat pump 140 is in fluid-conducting communication with the fluid storage tank 130. The exhaust gas from the combustion unit 111 can thus be cooled significantly more by the cold side of the heat pump 140 than by return water from the heat consumer 600. Due to the high temperature of the return cooling flow from the exhaust gas heat exchanger 120, the heat pump 140 can be operated with a high coefficient of performance (COP). In this way, up to 20% of the energy required by the heat consumer 600 can be supplied by the heat pump 140. The heat pump 140 is driven by electrical energy.

[0024] Furthermore, a storage device 160 is provided as a so-called buffer storage tank. The return water from the heat consumer 600 is preheated by the flow from the hot side of the heat pump 140. The return water from the heat consumer 600 flows through the storage device 160. The return water, preheated by the heat pump 140, is then reheated in the heat transfer unit 112 of the heating device 110 by the combustion unit 111 to the flow temperature required by the heat consumer. The storage device 160 can be designed as a container in which a quantity of generated heat can be stored and made available for heating as needed. Water can be used as the storage medium.Using the storage unit 160, the heat pump 140 can operate continuously within its optimal performance range, as the storage unit 160 absorbs excess heat when all heat consumers 600 are adequately supplied. This prevents the heat pump 140 from frequently switching on and off. Efficiency is increased, and the service life of the heat pump 140, as well as the number of maintenance cycles, is extended. Furthermore, renewable energy systems can be integrated into the cold side of the heat pump 140, particularly through the use of the storage unit 160. Multiple heat generators can also be combined. For example, a solar thermal and / or photovoltaic system can be integrated or installed.

[0025] The hot water and / or heating system 100 is designed to supply a heat consumer 600 with a corresponding amount of heat via the heating circuit 114. In the Fig. Figure 1 shows only one heat consumer 600 as an example. The hot water and / or heating system 100 according to the invention can supply a large number of heat consumers 600 with thermal energy. A distributor can be provided for this purpose, which is connected between the heat consumers 600 and the hot water and / or heating system 100. Furthermore, the hot water and / or heating system 100 according to the invention can also be configured for heating domestic hot water separately from the heating system or in combination.

[0026] Fig. Figure 2 shows a further schematic representation of a hot water and / or heating system according to a further preferred embodiment. The hot water and / or heating system 100 according to the one shown in the Fig. The embodiment shown in section 2 is based on the embodiment shown in the Fig. 1.

[0027] The hot water and / or heating system 100 according to the Fig. Figure 2 features a heat pump 140, which can be operated using electrical energy. The electrical energy required for operation can be supplied via an energy supply network 200. Alternatively or additionally, the heat pump can be supplied by means of a photovoltaic system 300. The photovoltaic system 300 can provide the electrical energy for operating the heat pump 140. This has the advantage that electrical energy can be generated emission-free. Furthermore, in one embodiment, the photovoltaic system 300 can include a battery storage unit (not shown) in which unused electrical energy can be stored and retrieved when needed (poor sunlight conditions, night) to supply the heat pump 140. Furthermore, the use of the photovoltaic system 300 can enable self-sufficient operation.

[0028] In a further embodiment of the hot water and / or heating system 100 according to the Fig. Figure 2 is a solar thermal system 400, comprising a solar heat exchanger 410. The solar thermal system 400 increases the amount of heat generated by the heat pump 140. The solar thermal system 400, or rather the solar heat exchanger 410, has a fluid connection to the fluid storage tank 130. Furthermore, the solar thermal system 400, or rather the solar heat exchanger 410, is connected to the cold side of the heat pump 140 via this fluid connection and the fluid storage tank 130. This connection to the cold side of the heat pump 140 allows the solar thermal system 400 to operate at low temperatures. Heated solar modules of the solar thermal system 400 can transfer their heat, for example via a fluid, to the fluid in the fluid storage tank 130 through the solar heat exchanger 410. Heat is also generated at low outside temperatures and with low solar irradiance.

[0029] In a further embodiment of the hot water and / or heating system 100 according to the Fig. 2 (see also) Fig. 1) A three-way valve 150 is provided between the heat pump 140 and the fluid storage tank 130. The three-way valve allows the maximum inlet temperature to the cold side of the heat pump 140 to be limited if the fluid storage tank 130 supplies an increased amount of heat to the heat pump 140, causing it to operate at an excessively high coefficient of performance (COP). This prevents malfunctions and / or damage.

[0030] According to a further embodiment, a heating device heat exchanger 170 is provided. The heating device heat exchanger 170 is connected in the heating circuit 114 between one or more heat consumers 600 and the heating device 110. This creates a small heating device circuit whose operating medium (e.g., water) is filled or already filled according to the system manufacturer's specifications, but not the entire circuit of the heat consumer 600. This is particularly advantageous in already installed hot water and / or heating systems 100 where the heating device 110 or the combustion unit 111 is replaced.

[0031] In a further embodiment of the hot water and / or heating system 100 according to Fig. 2. The hot water and / or heating system 100 can include an environmental energy system 500 with an environmental energy exchanger 510. The environmental energy system 500 has a fluid-conducting connection to the fluid storage tank 130 and the cold side of the heat pump 140. The amount of heat generated by the heat pump 140 can be increased by means of the environmental energy system 500. The environmental energy system 500 can feed a quantity of heat into the fluid storage tank 130 on the cold side of the heat pump 140 via the environmental energy exchanger 510.

[0032] The environmental energy system 500 can be configured as a geothermal system, utilizing geothermal energy. Alternatively, the environmental energy system 500 can be configured as a water-to-water heat pump system using a production well and an injection well. The extracted heat can be used to preheat the cold water return of the heat pump 140. This cold water is then further heated in the fluid storage tank 130. The three-way valve 150 can simultaneously limit the maximum inlet temperature to the cold side of the heat pump 140.

[0033] Fig. Figure 3 shows a further schematic representation of a hot water and / or heating system according to a further preferred embodiment. The hot water and / or heating system 100 according to the one shown in the Fig. The embodiment shown in section 3 is based on the embodiment shown in the Fig. 2. The embodiment of the hot water and / or heating system 100 according to the Fig. Figure 3 comprises a heating device 110 with a combustion unit 111, a heat transfer unit 112, and an exhaust gas heat exchanger 120. The exhaust gas heat exchanger 120 is integrated into the heating device 110. For example, the exhaust gas heat exchanger 120 is formed as a single piece with the combustion unit 111 or is directly integrated into the combustion unit 111. The exhaust unit 113 is thus directly connected to the exhaust gas heat exchanger 120 and discharges the exhaust gas. The exhaust gas heat exchanger 120 has the same function as in the embodiments of Figure 3. Fig. 1 and Fig. 2. The further cooling of the exhaust gas thus takes place within the heating device 110. This enables an efficient and less costly construction of new systems.

[0034] The term "may" refers in particular to optional features of the invention. Accordingly, there are also further developments and / or embodiments of the invention that additionally or alternatively include the respective feature(s).

[0035] From the combinations of features disclosed herein, isolated features can also be selected as needed and, by dissolving any structural and / or functional relationship that may exist between the features, used in combination with other features to define the subject matter of the claim. Reference sign 100 Hot water and / or heating system 110 Heating device 111 combustion unit 112 Heat transfer unit 113 Discharge unit 114 Heating circuit 120 exhaust gas heat exchangers 130 fluid storage tanks 140. Heat pump 150 three-way valve 160 storage device 170 Heating device-heat exchanger 200 energy supply network 300 photovoltaic systems 400 solar thermal system 410 solar heat exchangers 500 Environmental energy plant 510 Environmental Energy Exchangers 600 heat consumers

Claims

Hot water and / or heating system (100) comprising: - an exhaust gas heat exchanger (120) which is in fluid-conducting communication with a discharge unit (113) of a heating device (110) and is arranged in the exhaust gas stream of the discharge unit (113) in such a way as to exchange the heat contained in the exhaust gas stream; - a fluid storage tank (130) which is in fluid-conducting communication with the exhaust gas heat exchanger (120) and configured to absorb the heat from the exhaust gas heat exchanger (120) into a fluid contained in the fluid storage tank (130); - a heat pump (140) which is in fluid-conducting communication with the fluid storage tank (130) on the cold side and configured to provide the heat from the fluid in the fluid storage tank (130) to the heating circuit (114) on the hot side of the heat pump (140); and - a three-way valve (150) in fluid-conducting communication between the cold side of the heat pump (140) and the fluid storage tank. (130) is interposed,wherein the three-way valve (150) is designed to limit a maximum inlet temperature of the fluid to the cold side of the heat pump (140), characterized in that a storage device (160) is provided which is designed to store the amount of heat generated by the heat pump (140), and that the storage device (160) is fluid-conductingly integrated into the heating circuit (114) and on the warm side of the heat pump (140), so that return water of the heating circuit (114) can be preheated with the supply water of the warm side of the heat pump (140) via the storage device (160). Hot water and / or heating system (100) according to claim 1, further comprising: a heating device (110) comprising a combustion unit (111), a heat transfer unit (112) configured to transfer the heat generated by the combustion unit (111) to a heating circuit (114), and the exhaust unit (113) configured to transfer an exhaust gas flow generated by the combustion unit (111). Hot water and / or heating system (100) according to claim 2, wherein the combustion unit (111) is an energy generator for utilizing raw materials selected from a group comprising heating oil, liquefied petroleum gas, natural gas, hydrogen, coal, pellets and / or wood. Hot water and / or heating system (100) according to one of the preceding claims, wherein the heat pump (140) is supplied by means of electrical energy from an energy supply network (200) and / or from a photovoltaic system (300). Hot water and / or heating system (100) according to one of the preceding claims, with a heating device heat exchanger (170) in the heating circuit (114) which is integrated in a fluid-conducting connection between the heating device (110) and a heat consumer (600). Hot water and / or heating system (100) according to one of the preceding claims, comprising a solar thermal system (400) which is in fluid-conducting connection with the fluid storage tank (130) and is configured to provide a quantity of heat to the fluid of the fluid storage tank (130), and / or which is in fluid-conducting connection with the cold side of the heat pump (140) and is configured to provide a quantity of heat to the cold side of the heat pump (140). Hot water and / or heating system (100) according to one of the preceding claims, with an environmental energy system (500), in particular comprising an environmental energy exchanger (510), wherein the environmental energy system (500) or the environmental energy exchanger (510) is in fluid-conducting connection with the fluid storage (130) and is configured to provide a quantity of heat to the fluid of the fluid storage (130), and / or wherein the environmental energy system (500) or the environmental energy exchanger (510) is in fluid-conducting connection with the cold side of the heat pump (140) and is configured to provide a quantity of heat to the cold side of the heat pump (140). Hot water and / or heating system (100) according to the immediately preceding claim, wherein the environmental energy system (500) is designed as a geothermal system and / or groundwater system, Hot water and / or heating system (100) according to one of the preceding claims, wherein the exhaust gas heat exchanger (120) is formed integrally with the combustion unit (111) and / or heating device (110) or the exhaust gas heat exchanger (120) is integrated into the combustion unit (111) and / or heating device (110).

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