DE102007048728B4 - Heating boiler, heating system and method for operating a heating system, in particular for solar heating support - Google Patents

Abstract

A boiler (11), comprising - a fossil fuel fired burner chamber having a heat exchanger (2), - a burner feed (31) connecting the heat exchanger (2) to an outlet (330) for the flow (33) of a heating circuit ( 17) and an outlet (340) for the flow (34) of a service water charging circuit (18) connects, or a burner feed (31), the heat exchanger (2) having a common outlet for the flow (33) of a heating circuit (17) and the flow (34) of a service water charging circuit (18) connects, - a first inlet (360) for the return (36) of the heating circuit (17), - a second inlet (370) for the return (37) the service water charging circuit (18), - with a circuit consisting of exactly one circulating pump (3) for conveying a heat carrier and at least one first valve (104), wherein the first valve is a three-way mixing valve, - a burner return ( 30), the circuit with the Wärmeta wherein the circuit - in a first switching state, the first inlet (360), the second inlet (370) and the burner return line (30) coupled together, - in a second switching state, the first inlet (360) with the Burner return (30) and shuts off the second inlet (370), and - in a third switching state, shuts off the first inlet (360) and couples the second inlet (370) to the burner return (30).

Description

The invention relates to a heating boiler and a heating system and a method for heating a building according to the preamble of claim 1.

The term "boiler" below a device for generating heat for space heating and domestic water heating is called in a separate housing. In addition to the combustion chamber for fossil fuels in this housing typically at least circulating pump, electronic heating control, control valve (s) and the connections for connection to the heating and electrical installation housed.

Single or multiple dwellings are usually heated with previously described boilers. On the one hand, the space heater (in particular radiator, but also wall heating or underfloor heating) is operated via the burner. Furthermore, a hot water heat storage can be heated. In this heat storage, the service water can be housed itself, d. H. Fresh water can flow in and heated service water can be removed. In addition, there are also solutions in which liquid is stored as a storage medium in the heat storage and the service water is heated via a separate fresh water heat exchanger, if necessary. The present invention relates to both of these variants.

Heating systems are also increasingly being coupled with solar collectors, which additionally heat up the DHW cylinder via a support heat exchanger. The collector surface is usually dimensioned so large that in the summer and the transition months required for heating the process water energy can be provided largely solar. Due to this design is often more solar thermal energy available than is required for heating the service water, ie the service water is heated above the minimum required hot water temperature (excess heat). Only with large collector surfaces and expensive heating systems was the solar heat used to support the space heating. An example of this is in the EP 1 748 258 A2 specified.

So far common boiler for space heating and domestic water heating, z. B. after the generic EP 1 729 071 A2 , typically have a valve for switching between space heating and DHW heating, these two operating states are mutually exclusive. They generally have a common valveless flow and one return each for the space heating circuit and the service water heating charge circuit. The removal of (eg solar generated) excess heat from the hot water tank is not possible due to the design.

From the DE 44 09 883 A1 a heating system is known in which a three-way valve and a plurality of pumps, which are partially flowed through in the event of shutdown against their conveying direction, a solar-assisted space heating is possible.

The object of the invention is to design a cost-effective and very reliable boiler, which has a lower fossil energy consumption, especially in the transitional months.

The boiler according to the invention should be simple and largely identical in its components with conventional boilers so that development and production costs can be minimized.

This object is achieved by a boiler according to claim 1 and by the objects according to claims 3, 5, 7 and 10.

The boiler according to the invention should be used with all hot water tanks with heating and support heat exchanger, regardless of whether the memory filled with hot water or hot water is heated via a separate fresh water heat exchanger in the heat storage.

Not necessarily, but ideally, this boiler could also be fully compatible in terms of connections and function with conventional boilers. The additional functionality "solar heating support" could be fully integrated into the boiler. An exchange of existing by a boiler according to the invention is therefore easily possible. The reinstallation of a heating system using such a boiler is identical (and therefore just as easy) as that of a conventional heating system with solar hot water heating without solar heating support. Furthermore, such a boiler could also in systems with water heater without solar Charging be used. If, at a later point in time, the DHW cylinder is replaced by a tank with solar charging, the available surplus heat is automatically used for the space heating from this point onwards.

Through the use of the boiler according to the invention, the energy costs for space heating reduce by the amount of extracted excess heat. In addition, other positive effects are achieved: The average temperature level in the hot water tank is kept closer to the target hot water temperature and is therefore lower on average. This reduces the calcification tendency in the process water storage tank as well as standstill heat losses in the storage tank and the pipelines. The resulting lower temperature in the solar circuit increases the solar efficiency of solar collectors and thus increases their energy yield. All these factors additionally increase the energy efficiency of the heating system.

The boiler according to the invention would also require no coupling with the regulation of the solar system. Only the entry of additional heat energy via the "support heat exchanger" in the hot water tank is relevant and is automatically detected by the boiler and used as much as possible.

The integrated and for customers very attractive additional function "solar space heating support" would give the boiler according to the invention a competitive advantage over conventional boilers, thus the manufacturer of the product could achieve an increase in sales and value added per unit.

The following aspects are of importance when assessing the practicability of the presented concept: Heat surplus is mainly produced in the transitional period on sunny days and is usually available at noon at the earliest, since first the domestic water taken the day before or the morning has to be reheated. At this time, the heating of the interiors after the night setback has long been completed, because of the higher ambient temperatures, the then required heating flow temperature is typically already below 45 degrees. The speed of heat removal from the heat storage for heating support is secondary. It is largely irrelevant whether the excess heat is removed quickly or slowly. The only thing that matters is that it is taken to replace fossil-generated energy. If no space heating is required during the day, it is often necessary to control the temperature of the interior in the evenings. If excess heat is still available at the beginning of the night shutdown, it can be used to heat the still cold heating system in the period before the start of the heating time the next morning. In late spring and early autumn, the stored excess heat will often be enough to fully meet the heat demand for the morning temperature of the bathroom, etc.

After the end of a sunny period, the hot water may need to be reheated earlier as surplus heat has been removed and the store may therefore be able to hold less hot water for a bad weather period. Here, however, the conservation of energy applies: The additional amount of heat needed to heat up the process water is not greater than the amount of heat previously extracted for space heating (beneficial). However, the advantages of lower standstill losses and better solar efficiency of the collectors remains in this case.

The function "solar heating support" could be realized in the boiler by means of one or more suitably arranged valve (s) (switching or mixing valve). By suitable coupling with the charging circuit in Raumheizbetrieb thus the heat carrier of the heating circuit could be fully or partially promoted by the Aufheizwärmetauscher the service water charging circuit and the heat removed from the heating circuit fed / admixed. Both directions of flow of the heat carrier through the Aufheizwärmetauscher are conceivable and possible. If the extracted from the hot water heat storage and transported into the heating circuit heat capacity for space heating is not sufficient so the burner could be operated at the same time (with correspondingly reduced heating power) to maintain the required heating flow temperature.

Furthermore, the invention relates to a heating system with a boiler according to the invention and a method for heating a building.

Further features and advantages of the invention will become apparent from the following description and from the following drawings, to which reference is made. In the drawings show:

1 a schematic representation of a heating system with solar water heating and boiler according to the prior art

2 a schematic representation of a first embodiment of the heating system according to the invention, which operates according to the inventive method, and having a boiler according to the invention.

3 a schematic representation of a second embodiment of the heating system according to the invention, which operates according to the inventive method, and having a boiler according to the invention according to a second embodiment.

In 1 is a conventional heating system shown schematically, the heat storage 5 for service water. In the lower third of the heat storage 5 is a back-up heat exchanger 60 housed in a solar circuit 120 is involved. Here, the thermal energy obtained from the solar circuit with solar panels is entered into the water heater. In the upper third of the heat storage 5 is a heating heat exchanger 7 housed, the part of the service water charging cycle 18 is. The charging circuit 18 is with a heating circuit 17 coupled, via a common line section 30 and 31 in which a circulating pump 3 and a heating device, usually in the form of a burner. The burner 2 is operated in particular with fossil fuels (oil, gas, pellet, wood chips, wood, biogas, etc.).

Typically, three operating states (BZ) are provided:
0 - standby
1 - room heating
2 - Domestic hot water heating

BZ-0 - Standby:

BZ-0 is set when the current hot water temperature measured with sensor 8th is at or above the setpoint for the dhw temperature and space heating is not required. The heating control 10 switches circulation pump 3 and burner 2 off, the position of the switching valve 4 is irrelevant. The system is at rest.

BZ-1 - space heating:

The heating control 10 sets the three-way switching valve 4 such that the flow of the heat carrier of 4C → 4B is possible; 4A is closed. The pump 3 drives the heat transfer medium over the line section 30 through the heat exchanger of the combustion chamber 2 (in pump-arrow direction) where it is heated to the required temperature level for space heating. About burner feed 31 and branch 32 the heat transfer medium flows via the heating flow 33 of the boiler 11 along current direction 17 to the space heating surfaces 1 , gives off heat there and then flows back to the heating return inlet 360 at the boiler 11 , From there it flows on the way 4C → 4B back to the pump 3 , The service water charging circuit 18 is blocked because the charge return 37 (attached to 4A ) is closed. Therefore, no heat transfer at the branch 32 for charging 34 flow. Domestic hot water heating in the BZ-1 is therefore via the boiler 11 not possible.

BZ-2 - domestic water heating:

Falls the hot water temperature measured with sensor 8th below the setpoint, so does the heater control 10 the three-way switching valve 4 such that the flow of the heat carrier of 4A → 4B is possible; 4C is closed. The pump 3 drives the heat transfer medium over the line section 30 through the heat exchanger of the combustion chamber 2 (in pump-arrow direction) where it is heated to the required temperature level for domestic water heating. About burner feed 31 and branch 32 the heat transfer medium flows over the charge lead 34 of the boiler 11 along current direction 18 to the heating heat exchanger 7 in the water heater 5 , It heats up the upper part of the heat accumulator and then flows back to the charge return inlet 370 at the boiler 11 , From there it flows on the way 4A → 4B back to the pump 3 , The heating circuit 17 is blocked because of its return 36 (attached to 4C ) is closed. Therefore, no heat transfer at the branch 32 to the heating flow 33 flow. Space heating is therefore not possible in the BZ-2. Is the dhw target temperature measured at sensor 8th in the upper layer of the Water heater 5 reached, then the heating control 10 switch to BZ-0 - Standby or BZ-1 - room heating as required.

Due to the design is a transport of heat energy from the hot water tank 5 for use in the space heating circuit 17 . 1 in a conventional boiler according to 1 not possible, since a coupling of charging and heating circuit is not provided.

In 2 a first embodiment of the boiler according to the invention is shown. This boiler additionally provides the BZ-3 - space heater with solar backup. It is in construction and function largely in accordance with the conventional boiler 1 so that in the following only the differences will be discussed. The already introduced reference numerals are therefore also used for the functionally identical, already described parts.

Notwithstanding the conventional boiler after 1 uses the boiler according to the invention according to 2 instead of the three-way switching valve, a three-way mixing valve 104 , which in contrast to the three-way switching valve in the conventional boiler (here is either only heating circuit 17 or just charge cycle 18 active) allowed, both currents 17 and 18 at the same time allow them in a common line section (in which the circulation pump 3 is) and their volume ratio stepless (or in discrete steps) to regulate. The heating control 10 has the following features, described below, for the three-way mixing valve 104 infinitely (or in discrete steps) and to realize the BZ-3 - space heating with solar support.

Four operating states (BZ) are provided as a minimum:
0 - standby
1 - room heating ("second switching state")
2 - Domestic hot water heating ("third switching state")
3 - Space heating with solar assistance ("first switching state")

BZ-0 - Standby:

This BZ is identical to the description of the BZ-0 too 1 , The position of the mixing valve 104 is irrelevant.

BZ-1 - Room heating ("second switching state"):

The heating control 10 sets the three-way mixing valve 104 such that the flow of the heat carrier of 104C → 104B is possible; 104A is completely closed. The mixing valve 104 therefore has identical flow characteristics as the three-way diverter valve 4 of the conventional boiler 1 in the BZ1 - room heating. The functional description of the BZ-1 is therefore identical to the description of the BZ-1 1 ,

BZ-2 - DHW heating ("third switching state"):

Falls the hot water temperature measured with sensor 8th below the setpoint, so does the heater control 10 the three-way mixing valve 104 such that the flow of the heat carrier of 104A → 104B is possible; 104C is completely closed. The mixing valve therefore has identical flow characteristics as the three-way switching valve of the conventional boiler 1 in the BZ-2. The functional description of the BZ-2 is therefore identical to the description of the BZ-2 1 ,

BZ-3 - Space heating with solar support ("first switching state"):

This operating mode is set when space heating operation is required and when external (solar) charging the hot water temperature measured with sensor 8th both the setpoint hot water temperature by at least 1 ° and the flow temperature currently required for the space heating at least by a predetermined temperature difference (eg 3 °). The heating control 10 moves the three-way mixing valve in mixing position, ie flow of the heat carrier is from 104C → 104B (Volume flow 17 ) as well as from 104A → 104B (Volume flow 18 ) possible. The volume ratio of the two streams 17 and 18 can from the heating control by adjusting the mixing valve 104 be controlled steplessly (or in discrete steps). The opening ratio of the two inlets 104A and 104B of the three-way mixing valve 104 thus causes the pump 3 funded total volume flow 16 at the junction 32 divided accordingly. On the one hand in electricity 18 , about the excess heat from the water heater 5 over the heat exchanger 7 is removed. This occurs heated at the charge return inlet 370 in the boiler and is in the mixing valve 104 over inlet 104A added to the heating return. The charging circuit is thus used in this BZ for heating support by return lift. electricity 17 forms the heating circuit for space heating. About the ratio of the two volume flows (adjustable to mixing valve 104 ), the heat extraction from the hot water tank can be influenced.

burner 2 can be switched off completely or operated with reduced heat output, if the over current 18 heat output taken from the DHW tank is insufficient for the room heating to the required heating flow temperature (measured at sensor 9 ) to maintain.

Optionally could be via the heating control 10 the capacity of the circulation pump 3 in this BZ be increased to the full volume flow rate of the space heating circuit 17 with simultaneous operation of circulation 18 sure. As a rule, however, the volume flow rate of the circuit 18 smaller than that of the heating circuit 17 be kept, so that can be dispensed with an increase in the delivery of the pump well. As explained in the introduction, it is not necessary for the excess heat to be quickly removed from the heat storage, a "creeping" removal serves its purpose as well.

Reaches or falls below the hot water temperature measured on sensor 8th the setpoint or is it only slightly more than the flow temperature required for the room heating circuit, the BZ-3 - space heating is terminated with solar support and switched to BZ-1 - space heating.

The BZ-3 room heater with solar backup must not be activated for a suitable period of time after the activation of the special function "Legionella control" (for this the process water is temporarily heated to an elevated temperature level), so that the elevated temperature level in the process water storage tank remains sufficiently long to prevent the dangerous Sure to kill germs. This is when programming the heating control 10 to take into account.

Noteworthy is the extremely simple design of the boiler according to 1 , Also interesting is the following aspect: In the embodiment according to 1 the heat transfer medium flows through the heating coil to remove surplus heat 7 not from bottom to top (a flow direction of the heat carrier against the temperature gradient in the heat storage would be even better for heat extraction) but in the current direction 18 , For a pronounced temperature gradient of the storage contents in the area of the heating heat exchanger 7 this can cause the transport of heat from top to bottom. This is undesirable in itself. In the present application, however, this is not a disadvantage and for the following reason: The heating support and thus the heat extraction is terminated when the sensor 8th the hot water temperature drops to the setpoint. Thus, the water in the upper storage area is not cooled below the set point hot water temperature and therefore remains fully usable.

Alternatively (in 2 not shown), the branch 32 also be installed outside the boiler, if this is more advantageous for the wiring (especially if hot water heat storage is not in the immediate vicinity of the boiler). The empty outlet ( 330 or 340 ) of the boiler 11 should be closed in this case.

In 3 a second embodiment of the boiler according to the invention is shown. This boiler additionally provides the BZ-3 - space heater with solar backup. It is in construction and function largely in accordance with the conventional boiler 1 so that in the following only the differences will be discussed. The already introduced reference numerals are therefore also used for the functionally identical, already described parts.

The more expensive construction of the boiler according to the invention 3 opposite the boiler in 2 There is the advantage that if there is excess heat in the heat accumulator, the BZ-3 room heating with solar backup can already be set if the domestic hot water temperature exceeds the heating return temperature. The simpler designed boiler according to 2 However, for the BZ room heating with solar support requires that the hot water temperature exceeds the space heating flow temperature (this is higher than the heating return temperature). Additionally advantageous for the removal of heat from the hot water heat storage 5 is the flow direction 19 of the heat carrier through the Aufheizwärmetauscher 7 in the removal of heat from the hot water heat storage 5 , This is the flow direction 18 the charging circuit in the operating state hot water heating opposite and is optimal for the removal of heat.

Notwithstanding the conventional boiler after 1 uses the boiler according to the invention according to 3 in addition a three-way mixing valve 20 , as well as a bypass line 21 that to the return 37 of the charging circuit leads. The heating control 10 has advanced features described below, around the three-way mixing valve 20 steplessly (or in discrete steps) to set and the BZ "space heating with solar support" to realize. There are two additional temperature sensors on the heating flow 33 and at the heating return 36 of the boiler 11 required, namely the sensors 22 and 23 ,

Four operating states (BZ) are provided as a minimum:
0 - standby
1 - room heating ("second switching state")
2 - Domestic hot water heating ("third switching state")
3 - Space heating with solar assistance ("first switching state")

BZ-0 - Standby:

This BZ is identical to the description of the BZ-0 too 1 , The position of the mixing valve 20 is irrelevant.

BZ-1 - Room heating ("second switching state"):

The heating control 10 sets the three-way mixing valve 20 such that the flow of the heat carrier of 20A → 20C is possible; bypass 21 at 20B is completely closed and thus blocked. The mixing valve 20 has identical flow properties as the pipe section 30 between pump 3 and burner 2 of the conventional boiler 1 , The functional description of this BZ is therefore identical to the description of the BZ-1 - room heater too 1 ,

BZ-2 - DHW heating ("third switching state"):

Falls the hot water temperature measured on sensor 8th below the setpoint, so does the heater control 10 the three-way mixing valve 20 such that the flow of the heat carrier of 20A → 20C is possible; bypass 21 at 20B is completely closed and thus blocked. The mixing valve 20 has identical flow properties as the pipe section 30 between pump 3 and burner 2 of the conventional boiler 1 , The functional description of this BZ is therefore identical to the description of the BZ domestic water heating 1 ,

BZ-3 - Space heating with solar support ("first switching state"):

This operating mode is set when space heating operation is required and when external (solar) charging the hot water temperature measured at sensor ( 8th ) both the set DHW temperature by at least 1 ° and the instantaneous return temperature (measured at sensor 23 ) of the space heating circuit 17 at least by a predetermined temperature difference (eg 3 °) exceeds. The heating control 10 switches the three-way switching valve 4 on heating, so that the flow of the heat carrier of 4C → 4B is possible, 4A is closed.

The three-way mixing valve 20 is brought into mixing position, so that of the pump 3 funded total electricity 16 into the mixing valve 20 above 20A enters and is split there. A part (electricity 19 ) flows through the bypass 21 ( 4A is closed) to the heat exchanger 7 of the hot water tank 5 , and is heated there. The other part of the stream (electricity 19a ) flows from 20C via wire 30 , flows around the combustion chamber of the burner 2 and passes through the burner flow 31 to the branch 32 , There he mixes with electricity 19 and forms the space heating flow 17 whose temperature is with sensor 22 is removed. The volume ratio of the two partial flows can be controlled by the heater control by adjusting the mixer 20 be controlled steplessly (or in discrete steps).

About the ratio of the two volume flows 19 and 19a can the heat removal from the hot water tank and thus the space heating flow temperature can be influenced.

burner 2 can either be completely switched off or operated with reduced heating power, if the over current 19 heat output taken from the DHW tank is insufficient for space heating, the required heating flow temperature (measured at sensor 22 ) to maintain.

Reaches or falls below the hot water temperature measured on sensor 8th the setpoint for the process water or is it only slightly more than the current return temperature of the Raumheizkreises measured on sensor 23 , the BZ-3 - space heating is ended with solar support and switched to BZ-1 - room heating.

The BZ-3 room heater with solar backup must not be activated for a suitable period of time after activation of the special function "Legionella control" (for this, the process water is temporarily heated to an elevated temperature level), so that the elevated temperature level in the process water storage tank remains sufficiently long to potentially increase the level safely kill harmful germs. This is when programming the heating control 10 to take into account.

The three-way mixing valve 20 can be provided with a dedicated actuator, by the heating control 10 via wire 24 is controlled. As a cheaper variant, the valves 4 and 20 but also mechanically 25 coupled, so only one actuator is required. It makes sense, the valves 4 . 20 to be integrated in a common housing (hydraulic block).

The following table illustrates the function of the two valves depending on the position of the actuator (0 ° -270 ° in this example). The adjustment range of 90 ° 270 ° serves for z. B. stepless control of the mixing valve 20 , Actuator position switching valve 4 mixing valve 20 operating condition 4A → 4B 4C → 4B 20A → 20B 20A → 20C 0 ° On To To On Domestic water heating 90 ° To On To On space heating 91 ° ↓ To On opens successively throttles successively Space heating m. solar support 180 ° To On 50% 50% Space heating m. solar support ↓ To On opens successively throttles successively Space heating m. solar support 270 ° To On 100% = up 0% = to Space heating m. solar support

In an even more cost effective variant (in the drawing 3 not shown) could the mixing valve 20 replaced by a simple branch (T-piece). In the bypass 21 would be one of the heating control 10 controlled valve (eg open / closed) which activates or deactivates the heating support. If the conditions for BZ-3 were met, this valve would be opened so that the total volume flow 16 a partial flow along 19 can flow to the heating support. If the extracted heat output from the DHW cylinder is higher than required for room heating (the flow temperature measured at sensor 22 would then increase above the current setpoint for the heating flow) so the valve can be temporarily closed to temporarily prevent further heat input from the heat storage in the heating circuit.

Alternatively (in 3 not shown), the branch 32 also be installed outside the boiler, if this is more advantageous for the wiring (especially if hot water heat storage is not in the immediate vicinity of the boiler). The empty outlet ( 340 ) of the boiler 11 is in this case to close, the sensor 22 is accordingly outwards to the heating flow at the branch 32 relocate.

LIST OF REFERENCE NUMBERS

1

Raumheizfläche (n)

2

Burner / heat exchanger combustion chamber

3

circulating pump

4

Three-way reversing

5

Water-heat storage

7

Aufheizwärmetauscher

8th

Sensor service water temperature

9

Sensor burner feed

10

heating control

11

Boiler (includes components within the dashed rectangle)

13

Hot water temperature limiter (optional)

14

Domestic hot water withdrawal

15

Fresh water supply

16

Overall flow

17

Flow room heating (BZ-1 and BZ-3)

18

Flow charging circuit (BZ-2) and flow heating support (only 2 in the BZ-3)

19

Flow heating support (BZ-3)

19a

Flow burner circuit (only 3 in the BZ-3)

20

Three way mixing valve

21

bypass

22

Sensor heating flow

23

Sensor heating return

24

Control actuator drive valve 20 - or -

25

Mechanical coupling actuator valve 4 and 20

28

Flow burner circuit

30

Brenner return

31

Burner lead

32

junction

33

Heating flow

34

charging forward

36

Heating return

37

Charging Return

104

Three-way mixing valve

60

Support heat exchanger

120

Support cycle

330

Outlet for space heating flow

340

Outlet for domestic water charging circuit supply

360

Inlet for space heating return

370

Inlet for service water charging circuit return

Claims (16)

Boiler ( 11 ), with - a combustion chamber fueled by fossil fuels with a heat exchanger ( 2 ), - a burner feed ( 31 ), the heat exchanger ( 2 ) with an outlet ( 330 ) for the lead ( 33 ) of a heating cycle ( 17 ) and an outlet ( 340 ) for the lead ( 34 ) of a service water charging circuit ( 18 ), or a burner feed ( 31 ), the heat exchanger ( 2 ) with a common outlet for the flow ( 33 ) of a heating cycle ( 17 ) and the forerun ( 34 ) of a service water charging circuit ( 18 ), - a first inlet ( 360 ) for the return ( 36 ) of the heating circuit ( 17 ), - a second inlet ( 370 ) for the return ( 37 ) of the service water charging circuit ( 18 ), - with a circuit consisting of exactly one circulating pump ( 3 ) for conveying a heat carrier and at least one first valve ( 104 ), wherein the first valve is a three-way mixing valve, - a burner return ( 30 ), the circuit with the heat exchanger ( 2 ) connects the circuit - in a first switching state, the first inlet ( 360 ), the second inlet ( 370 ) and the burner return ( 30 ), - in a second switching state, the first inlet ( 360 ) with the burner return ( 30 ) and the second inlet ( 370 ), and - in a third switching state, the first inlet ( 360 ) and the second inlet ( 370 ) with the burner return ( 30 ) couples. Heating boiler according to claim 1, characterized in that the boiler has a heating control integrated therein ( 10 ) which controls the circuit. Boiler ( 11 ), with a burner space fueled by fossil fuels with a heat exchanger ( 2 ), - a burner feed ( 31 ), the heat exchanger ( 2 ) with an outlet ( 330 ) for the lead ( 33 ) of a heating cycle ( 17 ) and an outlet ( 340 ) for the lead ( 34 ) of a service water charging circuit ( 18 ), or a burner feed ( 31 ), the heat exchanger ( 2 ) with a common outlet for the flow ( 33 ) of a heating cycle ( 17 ) and the forerun ( 34 ) of a service water charging circuit ( 18 ), - a first inlet ( 360 ) for the return ( 36 ) of the heating circuit ( 17 ), - a second inlet ( 370 ) for the return ( 37 ) of the service water charging circuit ( 18 ), - with a circuit consisting of exactly one circulating pump ( 3 ) for conveying a heat carrier, a first valve ( 4 ), wherein the first valve is a three-way switching valve or a three-way mixing valve, a bypass ( 21 ) between a second valve ( 20 ) and the second inlet ( 370 ), wherein the second valve ( 20 ) between the output of the pump ( 3 ) and the burner return ( 30 ), and wherein the second valve ( 20 ) a three-way mixing valve or a combination of T-stick and one of a heating control ( 10 ) controlled valve in the bypass ( 21 ), - a burner return ( 30 ), the circuit with the heat exchanger ( 2 ) wherein the circuit - in a first switching state, the second inlet ( 370 ) on the first valve ( 4 . 4A ) and the first inlet ( 360 ) over the bypass ( 21 ) with the second inlet ( 370 ) and / or the burner return ( 30 ), - in a second switching state, the first inlet ( 360 ) with the burner return ( 30 ) and the second inlet ( 370 ) as well as the bypass ( 21 ), and - in a third switching state, the first inlet ( 360 ) as well as the bypass ( 21 ) and the second inlet ( 370 ) with the burner return ( 30 ) couples. Heating boiler according to claim 3, characterized in that the boiler has a heating control integrated in it ( 10 ) which controls the circuit. Heating system, with - a heating circuit ( 17 ) for space heating, - a hot water heat storage ( 5 ) for the process water temperature control, - a service water charging circuit ( 18 ), - one in the hot water heat storage ( 5 ) arranged Aufheizwärmetauscher ( 7 ) in the process water charging circuit ( 18 ) for heating the hot water heat storage ( 5 ), - a support cycle ( 120 ), the one in the hot water heat storage ( 5 ) arranged support heat exchanger ( 60 ), and - one operating in the heating cycle, using fossil fuels ( 17 ) and the service water charging circuit ( 18 ) integrated boiler ( 11 ) according to claim 1 wherein in the heating cycle ( 17 ) and in the service water charging circuit ( 18 ) a total of exactly one circulation pump ( 3 ), whereby in the boiler ( 11 ) is located. Heating installation according to claim 5, characterized in that the circuit is a first valve ( 104 ) operating heating control ( 10 ) equipped with temperature sensors ( 8th . 23 ), which determines the domestic water temperature and the return temperature in the heating circuit ( 17 ) immediately upstream of the valve ( 104 ) determine. Heating system, with - a heating circuit ( 17 ) for space heating, - a hot water heat storage ( 5 ) for the process water temperature control, - a service water charging circuit ( 18 ), - one in the hot water heat storage ( 5 ) arranged Aufheizwärmetauscher ( 7 ) in the process water charging circuit ( 18 ) for heating the hot water heat storage ( 5 ), - a support cycle ( 120 ), the one in the hot water heat storage ( 5 ) arranged support heat exchanger ( 60 ), and - one operating in the heating cycle, using fossil fuels ( 17 ) and the service water charging circuit ( 18 ) integrated boiler ( 11 ) according to claim 3 wherein in the heating cycle ( 17 ) and in the service water charging circuit ( 18 ) a total of exactly one pump ( 3 ), whereby in the boiler ( 11 ) is located. Heating installation according to claim 7, characterized in that the circuit a the valves ( 4 and 20 ) operating heating control ( 10 ) equipped with temperature sensors ( 8th . 22 . 23 ), which is the hot water temperature, the return temperature in the heating circuit ( 17 ) immediately upstream of the valve ( 4 ) and the flow temperature in the heating circuit ( 17 ) determine. Heating installation according to one of claims 5 to 8, characterized in that it is in the support heating cycle ( 120 ) around a solar circuit and at the support heat exchanger ( 60 ) is a solar heat exchanger. Method for operating the heating system according to one of claims 5 to 8, characterized in that a through the support circuit ( 120 ) supported space heating takes place by the first switching state of the circuit via the Aufheizwärmetauscher ( 7 ) Heat energy from the hot water heat storage ( 5 ) in the heating cycle ( 17 ) is fed. A method according to claim 10, characterized in that the heating cycle ( 17 ) from the hot water heat storage ( 5 ) supplied amount of heat by means of the valve ( 104 or 20 ) is continuously adjusted. A method according to claim 10 or 11, characterized in that only then the space heating on the hot water heat storage ( 5 ) is supported when the current domestic hot water temperature both the hot water target temperature and the required flow temperature of the heating circuit ( 17 ) exceeds. A method according to claim 10 or 11, characterized in that only then the space heating on the hot water heat storage ( 5 ) is supported when the current domestic hot water temperature is both the hot water target temperature and the instantaneous return temperature of the heating circuit ( 17 ) exceeds. Method according to one of claims 10 to 13, characterized in that it is in the support heating cycle ( 120 ) around a solar circuit and at the support heat exchanger ( 60 ) is a solar heat exchanger. A method according to claim 14, characterized in that by the support cycle ( 120 ) solar-assisted space heating is interrupted for night reduction. Method according to one of claims 14 or 15, characterized in that during the by the support cycle ( 120 ) solar assisted space heating the heater ( 2 ) runs at least temporarily, without the hot water heat storage ( 5 ) to heat up.

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