Brunner BHZ 3.0 User manual

Instructions for Use
BRUNNER Heating Center
BHZ 3.0
©2023

BHZ 3.0
2 Instructions for Use BHZ 3.0 (6.14) © 2023 Brunner GmbH

Contents
1 Introduction.................................................................................................................6
1.1 Purpose of this manual................................................................................................................. 6
1.2 Target audience.............................................................................................................................6
1.3 Validity of these instructions......................................................................................................... 6
1.4 Keeping of documents.................................................................................................................. 6
1.5 Symbols and text style rules.........................................................................................................7
1.5.1 Specified symbols........................................................................................................... 7
1.5.2 Text style rules................................................................................................................ 7
1.6 For your safety.............................................................................................................................. 8
1.6.1 Dangers and safety precautions.....................................................................................8
1.6.2 Warnings......................................................................................................................... 9
1.6.3 Regulations....................................................................................................................10
1.6.4 Conformity..................................................................................................................... 10
1.6.5 Obligations of our Natural Power Partners...................................................................10
2 Product description..................................................................................................12
2.1 Intended use................................................................................................................................13
2.2 Identification plates......................................................................................................................13
2.3 Overview of components and connections on the BHZ 3.0 Heating Center...............................15
2.4 Hydraulic Box.............................................................................................................................. 17
2.4.1 Basic Module.................................................................................................................19
2.4.2 Solid fuel module.......................................................................................................... 19
2.4.3 Solar module................................................................................................................. 20
2.4.4 Module additional heating (Heat generator)................................................................. 20
2.4.5 Fresh water module...................................................................................................... 21
2.4.6 Hot water storage loading module................................................................................23
2.4.7 Heating Circuit Modules................................................................................................24
2.4.8 Heat pump integration.................................................................................................. 24
2.4.9 Photovoltaic integration.................................................................................................25
2.4.9.1 PV - Connection plan..................................................................................... 26
2.4.9.2 PV power controller BHZ................................................................................27
2.4.9.3 The connection of a power storage................................................................28
2.4.10 Electro-central heating modules................................................................................... 28
2.4.10.1 Assembley options for the electric immersion heater.....................................29
2.4.11 Installation examples.....................................................................................................29
2.5 Storage tank................................................................................................................................ 32
2.5.1 750 or 1000 litre storage tank...................................................................................... 32
2.5.2 1500 or 2000 litre storage tank.................................................................................... 32
2.6 Optional components...................................................................................................................35
2.6.1 Standard storage tank.................................................................................................. 35
3 Operation basics...................................................................................................... 36
3.1 Licenses.......................................................................................................................................36
3.2 Data protection declaration of Ulrich Brunner GmbH................................................................. 37
3.3 Touch Display.............................................................................................................................. 37
© 2023 Brunner GmbH Instructions for Use BHZ 3.0 (6.14) 3

3.4 Overview of softkeys................................................................................................................... 39
3.5 Solar system................................................................................................................................43
3.5.1 Solar system display.....................................................................................................43
3.5.2 Solar system Home view.............................................................................................. 43
3.6 Photovoltaic connection...............................................................................................................45
3.6.1 PV connection displays.................................................................................................45
3.6.2 PV connection in Home view....................................................................................... 46
3.7 Biomass heat generators............................................................................................................ 50
3.7.1 Natural Power boiler (HT) as heat generator............................................................... 50
3.7.1.1 Display with Brunner Logwood Boiler............................................................ 50
3.7.1.2 Display with Brunner Pellet Boiler.................................................................. 51
3.7.1.3 Display with third-party biomass boiler...........................................................52
3.7.1.4 Brunner wood boiler Home view.................................................................... 53
3.7.2 Heat generator Tiled stove / Fireplace (OT).................................................................56
3.7.2.1 Tiled stove / Fireplace display........................................................................ 56
3.7.2.2 Brunner Pellet module display........................................................................56
3.7.2.3 Tiled stove / Fireplace Home view................................................................. 56
3.8 Additional heating systems......................................................................................................... 57
3.8.1 Additional heating display............................................................................................. 57
3.8.2 Additional heating Home view...................................................................................... 57
3.9 Heating.........................................................................................................................................59
3.9.1 Heating circuits display................................................................................................. 59
3.9.2 Heating Home view.......................................................................................................61
3.10 Hot water station......................................................................................................................... 62
3.10.1 Plate heat exchanger display....................................................................................... 63
3.10.2 Hot water storage tank (boiler) display.........................................................................63
3.10.3 Hot water Home view................................................................................................... 63
3.10.3.1 with plate heat exchanger (fresh water module)............................................ 63
3.10.3.2 with hot water storage tank (boiler)................................................................64
3.11 Trunk line.....................................................................................................................................65
3.11.1 Trunk line under Home................................................................................................. 65
3.12 Heat pump................................................................................................................................... 67
3.12.1 Displayed items in the Heating Home view..................................................................67
3.12.2 BHZ 3.0 with BWP........................................................................................................68
3.12.3 Heat pump under Home............................................................................................... 69
3.13 Individual settings........................................................................................................................ 72
3.13.1 Display customization................................................................................................... 72
3.13.2 Select or create heating programs............................................................................... 76
3.13.3 Hot water program settings.......................................................................................... 79
3.13.4 Absence periods........................................................................................................... 79
3.13.5 Circulation programs..................................................................................................... 80
3.13.6 Disinfection.................................................................................................................... 81
3.13.7 Screed drying................................................................................................................ 81
3.13.8 Selection of lowering mode.......................................................................................... 81
3.13.9 Heating circuit frost protection...................................................................................... 82
3.13.10 Summer/Winter switching............................................................................................. 83
4 Instructions for Use BHZ 3.0 (6.14) © 2023 Brunner GmbH

3.13.11 Permanent..................................................................................................................... 83
3.13.12 Defining periods............................................................................................................ 83
3.13.13 Communication of the system...................................................................................... 85
3.14 Remote access via myBRUNNER.............................................................................................. 86
3.14.1 Preconditions and instructions......................................................................................86
3.14.2 Connect keypads to the Internet.................................................................................. 87
3.14.3 Set up myBRUNNER....................................................................................................88
3.14.3.1 Registration..................................................................................................... 88
3.14.3.2 Logging in....................................................................................................... 98
3.14.3.3 Enabling for Service access......................................................................... 100
3.14.3.4 Brunner App..................................................................................................102
3.14.3.5 Synchronisation with network....................................................................... 103
3.14.4 Set up WLAN.............................................................................................................. 103
3.14.4.1 Set up WLAN - during commissioning......................................................... 103
3.14.4.2 Activate WLAN..............................................................................................104
4 Cleaning, maintenance, troubleshooting.............................................................106
4.1 Acknowledge error messages...................................................................................................106
4.2 Spare part BHZ 3.0...................................................................................................................107
4.3 Cleaning and maintenance....................................................................................................... 107
4.4 Update of the control unit......................................................................................................... 107
4.4.1 Software from PC on the USB-Stick.......................................................................... 108
4.4.2 Software from USB-Stick on the control unit..............................................................109
4.4.2.1 Variant 1....................................................................................................... 110
4.4.2.2 Variant 2....................................................................................................... 112
5 Technical and commercial data............................................................................113
5.1 Declaration of Conformity..........................................................................................................113
5.2 Dimension drawings.................................................................................................................. 114
5.3 Technical Data...........................................................................................................................122
© 2023 Brunner GmbH Instructions for Use BHZ 3.0 (6.14) 5

1 Introduction
1.1 Purpose of this manual
This document contains information about the BRUNNER Heating Center 3.0. Among others, you will find here infor-
mation about:
•Safety and risks
•Assembly, installation and commissioning
•Product description and principles of operation
•Operating instructions and control description
•Cleaning and maintenance
•Fault finding and troubleshooting
•Decommissioning and disposal
•Technical and commercial data
1.2 Target audience
This document contains also information for the User of the heating system.
1.3 Validity of these instructions
This technical documentation is valid for the BRUNNER Heating Center (BHZ) 3.0 starting from October
2014.
Ulrich Brunner GmbH reserves the right to introduce technical changes, as far as they serve for technical
progress, or if they are required by technical safety provisions.
1.4 Keeping of documents
IMPORTANT
READ CAREFULLY BEFORE USE
KEEP FOR FUTURE REFERENCE
The User is responsible for keeping of the BRUNNER Heating Center 3.0 documentation, as well as all other
important documents.
6 Instructions for Use BHZ 3.0 (6.14) © 2023 Brunner GmbH

1.5 Symbols and text style rules
1.5.1 Specified symbols
In this documentation, a distinction is made between:
Operating personnel as the User of the system, i.e. the end user, which has received instructions from the Contractor
and does not necessarily have additional qualifications.
Operating personnel as the Contractor, i.e. the qualified professionals, which are entitled to perform the indicated spe-
cialist works.
In this document, the following symbols are used:
DANGER
A danger of high risk persists, which leads to severe injury or death, if this endangering situa-
tion is not avoided.
WARNING
A danger of medium risk persists, which can lead to severe injury or death, if this endangering
situation is not avoided.
CAUTION
A danger of low risk persists, which can lead to minor or moderate injury, if this endangering
situation is not avoided.
ATTENTION
There is a certain risk, which can lead to a malfunction or damage of the related system and all
devices connected with it, if the indicated notifications are not followed.
NOTE
Additional helpful information
1.5.2 Text style rules
In this document, the following text style rules are in use:
Handling or operating instructions with several steps
Descriptions of operations or actions with several steps, when these steps must be performed in chronologi-
cal sequence.
1. First working step;
2. Second working step;
3. Third step.
→ Final result
© 2023 Brunner GmbH Instructions for Use BHZ 3.0 (6.14) 7

Appearance of on-screen display text in this manual
For descriptions of settings performed on the BRUNNER Touch Display, the displayed text is shown as bold
letters.
1.6 For your safety
1.6.1 Dangers and safety precautions
Assembly, installation and maintenance works may be performed only by a qualified Contractor.
•Only such activities should be performed, which are described in this manual.
Electrical shock
Electrical installation works may be performed only by a qualified Contractor.
•Electrical connections are under mains voltage. This can lead to electric shock.
•Please observe all valid regulations.
Risk of injury caused by hot water
High water temperatures can lead to scalding. Small kids or elderly people can be in
danger even at lower temperatures.
•The highest temperature setting of the connected hot water storage tank must not
exceed 65°C.
Avoiding equipment damages and the resulting risks
Sprays, solvents or chlorine-based cleaning agents, paints, adhesives etc. can lead
to equipment damage under some circumstances.
Never try to modify for some reason any part or equipment of the heating system, if
these modifications could impair the operational safety.
The fresh water module can be used only in such situation, if there are no galvanized
pipelines within the home piping system, because the heat exchanger is soldered
with copper.
Risk of freezing
When the BHZ 3.0 is not in use for a longer period (e.g. during holidays) in a room
without heating, there is a risk that the water will freeze in pipelines. Freezing water
can damage the pipelines and cause consequential damages.
•Please instruct the user about the frost protection mode of the heating system.
•The BHZ 3.0 must be installed in rooms with a temperature range between 0 °C
and 40 °C.
8 Instructions for Use BHZ 3.0 (6.14) © 2023 Brunner GmbH

DANGER
This device can be used by kids above 8 years and persons with limited physical or
mental ability, or lacking experience and knowledge, only if they are supervised or
have received instructions on safe operation of the device and they are able to under-
stand the resulting dangers. Kids may not play with this device. Cleaning and user-
maintenance cannot be performed by kids without supervision.
1.6.2 Warnings
Warnings in this document are emphasized by pictographs and signal words.
The pictograph and the signal word indicate the type, the source or causes of a certain action. The neces-
sary measures or calls for action are indicated.
The result or purpose is shown as well. These warnings refer to possible misuse of the system, which seems
likely based on our experience. The residual risks are indicated too.
The residual risks remain:
- despite the means for integration of safety during construction,
- despite the safety precautions,
- despite the additional protective measures.
For certain points, there are also given some recommendations and instructions on the application of protec-
tive measures, including personal protective equipment. Special safety instructions and recommendations
are applied for transport, handling and storage. Instructions for safe setup and maintenance include separate
protective measures too.
Structure of warnings
The warnings that precede each assembly step, are shown as follows:
Hazard for humans
Type, source and causes of danger
Measures
Calls for action
→ Result or safe use
Hazard for the system
Type, source and causes of danger
Measures
Calls for action
→ Result or safe use
© 2023 Brunner GmbH Instructions for Use BHZ 3.0 (6.14) 9

1.6.3 Regulations
Among others, the following regulations and guidelines must be observed during installation, commissioning and main-
tenance of the BHZ 3.0:
Legal requirements:
■the legal regulations for accident prevention
■the legal regulations for environment protection
■the provisions of the industry associations
■the “Energy Saving in Buildings” law (Energieeinsparungsgesetz-EnEG)
■the Energy Saving Act (Energieeinsparverordnung-EnEV)
■the Master Fireplace Act (MFeuVo) of the respective Federal Countries (FeuVo)
■the Country Building Code and the list of technical building regulations
■the governmental, regional building codes and boiler room equipment listings.
Standards and Guidelines:
■the relevant safety conditions included in DIN, EN, DVGW, TRI and VDE standards
■EN 12828 Heating systems in buildings - Hot-water heating systems (2002)
■EN 12831 Heating systems in buildings. Method for calculation of the design heat load
■EN 14597 Temperature control devices and temperature limiters for heat generating systems
■DIN 4753 Water heating systems for drinking and process water
■DIN 4109 Sound insulation in buildings, supplementary sheets and permissions
■DIN 1988 Technical rules for drinking water installations (TRWI)
■DIN EN ISO 4126 or TRD 721 - Safety devices for protection against excessive pressure - Safety valves
■DIN VDE 0100 Part 540 2007-06 DIN VDE 0100-540 Setting up low voltage installations
■DIN VDE 0100 Part 701 2008-10 DIN VDE 0100-710 Low voltage installations
■DVGW worksheets W551 and W552 Technical measures to reduce the growth of Legionellae
■VDI 2035 Prevention of damage in hot-water heating systems (limestone formation, corrosion) (2009)
■VDI 4708 - Heating equipment (pressure maintenance, venting, degassing) (2012).
1.6.4 Conformity
Hereby we declare as the manufacturer that this product - BRUNNER Heating Center
3.0 (BHZ 3.0) - complies with the basic guidelines for sale in the EU.
1.6.5 Obligations of our Natural Power Partners
To ensure the proper functioning of the BHZ 3.0, observe the following guidelines:
10 Instructions for Use BHZ 3.0 (6.14) © 2023 Brunner GmbH

■Perform works only if you have the necessary expertise.
■Perform only such activities, which are indicated or described in this manual.
■Please ask an expert for instructions on the operation and maintenance of the system and potential haz-
ards that may arise during operation.
© 2023 Brunner GmbH Instructions for Use BHZ 3.0 (6.14) 11

2 Product description
The BRUNNER Heating Center (BHZ) 3.0 consists always of a Hydraulic Box and a dedicated System Stor-
age. Together they form a functional unit.
The Hydraulic Box is capable of handling power ranges from 15 up to 50 kW. The external dimensions of
the Hydraulic Box are identical for all variants.
The System Storage tank is available with capacities of 750, 1000, 1500 and 2000 liters.
The basic combination of the BHZ 3.0 includes a
Hydraulic Box (shown right) and a System Storage;
both are connected with each other. The necessary
expansion tanks for the heating and solar circuits
are not shown in the picture. They must be provided
on-site. The connections for the System Storage are
present on the side of the Hydraulic Box.
The connection ports can be on the left, as well as
on the right side of the Hydraulic Box, depending on
the local conditions on site.
All connections for the heating circuits, boiler supply and return lines, solar and hot water circuits are in-
stalled at the top of the Hydraulic Box. When additional heating is used, the supply and return lines are
connected to the lateral headers 1 and 8. The components inside the Hydraulic Box are completely pre-as-
sembled. Optionally, the Touch Display can be also installed in the living area for more comfortable control
of the heating system. Up to 5 displays can be connected in total.
When the Hydraulic Box is connected to a storage tank which is provided by other
manufacturers than Ulrich Brunner GmbH, it can lead to unwanted heat flows. The
heating system will not work properly at some circumstances.
In this case, Ulrich Brunner GmbH cannot be held responsible for faulty operation.
The functional warranty of the BHZ 3.0 is valid only for the combination of a Hydraulic
Box provided by Ulrich Brunner GmbH with the appropriate and dedicated System
Storage.
12 Instructions for Use BHZ 3.0 (6.14) © 2023 Brunner GmbH

2.1 Intended use
The BHZ 3.0 is designed and built according to generally accepted engineering standards.
The Hydraulic Box controls the coordination of all connected heat generating devices and all heat con-
sumers.
The BRUNNER System Storage is optimized for use as buffer tank with renewable energy sources. The pur-
pose of the System Storage is the collection, storage and supply (on demand) of all energy streams.
The following connections on the BHZ 3.0 are possible:
- as heat generating devices: e.g. a logwood boiler, a pellet boiler, a wood chips boiler, a solar heating sys-
tem with/without system separation, oil or gas boiler, a heat pump.
- as heat consumers: e.g. one or two heating circuits, additional (up to 6) heating circuits are possible with
external extension boards (EWPs). Heat consumers can include floor heating systems, radiators, wall heat-
ing systems or a swimming pool. Domestic hot water heating is possible either by installing a fresh water
module, or by using a hot water storage tank.
- additional buffer tank as extension of the System Storage capacity.
Connecting of incompatible buffer tanks or other equipment may result in deviations of the intended applica-
tion and all their unintended and undesirable consequences. Always seek advice from an expert craftsman;
remember that all works should be carried out by authorized companies. All warranty claims are void, if the
above requirements are not held.
Nevertheless, in case of incorrect or improper use, dangers to life and limb of operating personnel or third
parties may arise. Such cases of incorrect or improper use can also lead to equipment damage and other
property damage.
2.2 Identification plates
Illustration 1: BHZ 3.0 identification plate
The following information can be found on the Hydraulic
Box identification plate:
1. Name of the manufacturer
2. CE - Certification, Marking according to Elektro-laws
3. Designation of equipment
4. Year built
5. Type
6. Address and contact data of the manufacturer
© 2023 Brunner GmbH Instructions for Use BHZ 3.0 (6.14) 13

The rating plates can be found inside the housing of the hydraulic box.
One plate is attached to the side panel, the second is on the cover of the
electric box.
The identification plate is found on the System Storage upper part, under the insulating trim. This identification plate is
valid for the System Storage, as well as the Standard Storage Tank from BRUNNER.
Illustration 2: Position of
the identification plate
The following information can be found
on the System Storage identification
plate:
1. Name of the manufacturer
2. Address and contact data of the man-
ufacturer
3. Type: Application range of the device
and volume specifications
4. Manufacturing number
5. Approved operating pressure in bar
6. Maximum operating temperature in
degrees Celsius
7. Vessel diameter without insulation in
mm
8. Note
14 Instructions for Use BHZ 3.0 (6.14) © 2023 Brunner GmbH

2.3 Overview of components and connections on the
BHZ 3.0 Heating Center
The BHZ 3.0 Heating Center con-
sists of:
A = Hydraulic Box
B = System Storage
The connections can be arranged
on the left or right, depending on
conditions on site.
Illustration 3: right Illustration 4: left
Illustration 5: setup example: Hydraulic Box with System Storage 1500 Liter
© 2023 Brunner GmbH Instructions for Use BHZ 3.0 (6.14) 15

1Supply, additional heating, solar, solid fuel
boiler 19 Heating circuit 2, supply
2 Supply, hot water, 20 Supply for additional heating connection
3 Supply, heating circuit 3+4 21 Supply for the 3rd & 4th heating circuit con-
nection
4 Supply, solar, mid of tank, 22 Return for the 3rd & 4th heating circuit con-
nection
5 Return, hot water 23 Return for additional heating connection
6 Return, heating circuit 24 Heating Center controller board
7 Return, solar heating system 25 Bottom tank sensor (S5)
8Return, connection for additional heating/sol-
id fuel boiler 26 System Storage insulation
9 Cold water 27 Connection for additional tank (Standard
Storage Tank type)
10 Circulation 28 Connection for additional tank (Standard
Storage Tank type)
11 Hot water 29 Connection for additional tank (Standard
Storage Tank type)
12 Heat pump (or. Solar heating system) 30 Connection for additional tank (Standard
Storage Tank type)
13 Heat pump (or. Solar heating system) 31 Laminar loading cylinder
14 Solid fuel/biomass boiler or tiled stove 32 Baffle for separation of storage tank areas for
drinking water and heating
15 Solid fuel/biomass boiler or tiled stove 33 Vent pipe
16 Heating circuit 1, return 34 Upper tank sensor (S3)
17 Heating circuit 1, supply 35 Mid of tank sensor (S4)
18 Heating circuit 2, return 36 Mid of tank sensor (S4.1)
For detailed views and descriptions: refer to chapter “Hydraulic Box” and “System Storage” - Hint: The num-
bering of parts in detailed drawings is the same as above.
16 Instructions for Use BHZ 3.0 (6.14) © 2023 Brunner GmbH

2.4 Hydraulic Box
The Hydraulic Box is a dedicated, compact Basic Installation Unit. It contains all technical components that
are necessary for a buffer-tank-based heating system
The front panel of the BHZ 3.0 is made of high of powder-coated steel. The lid of the panel can be opened
and locked in the open position. The front panel can be easily detached, ensuring a perfect access to all
parts of the Hydraulic Box. This is very important during replacement or installation of new functionalities in-
side the Hydraulic Box. The rear and side panels are made of powder-coated steel and are attached with
screws directly to the register frame.
The connections can be arranged on the left and the right side of the Hydraulic Box. The connection ports
are optimized for the components or options to be connected.
The components of a Hydraulic Box connected with a System Storage on the right are shown below. De-
pending on the components to be connected, these modules or connections can be used or not. Not used
connections have to be professionally sealed.
© 2023 Brunner GmbH Instructions for Use BHZ 3.0 (6.14) 17

Illustration 6: Example: with heat pump and fresh water module with premix
1Supply, solid fuel boiler or tiled stove,
heat generator, (solar heating system) 1 1/2“ AG 13 Heat pump line (or. solar heating system) 1“ AG
2 Hot water supply 1 1/4“ AG 14 Solid fuel/biomass boiler or tiled stove 1 1/2“ AG
3 Heating circuits supply 1 1/4“ AG 15 Solid fuel/biomass boiler or tiled stove 1 1/2“ AG
4Supply heat pump-heating (Solar mid)
Return for heat pump - hot water 1 1/4“ AG 16 Heating circuit 1, return 1“ AG
5 Hot water return 1 1/4“ AG 17 Heating circuit 1, supply 1“ AG
6 Heating circuits return 1 1/4“ AG 18 Heating circuit 2, return 1“ AG
7 Return for heat pump-heating (Solar) 1 1/4“ AG 19 Heating circuit 2, supply 1“ AG
8Return for solid fuel boiler or tiled stove,
heat generator 1 1/2“ AG 20 Supply heat generator (additional heating) 1 1/2“ AG
9 Cold water 1“ AG 21 Supply for the 3rd & 4th heating circuit connec-
tion 1 1/4“ AG
10 Circulation 3/4“ AG 22 Return for the 3rd & 4th heating circuit connec-
tion 1 1/4“ AG
18 Instructions for Use BHZ 3.0 (6.14) © 2023 Brunner GmbH

11 Hot water 1“ AG 23 Return for heat generator (additional heating) 1 1/2“ AG
12 Solar heating system 1“ AG 24 Controller board -
2.4.1 Basic Module
The Basic Module is a ready-to-install Hydraulic Box to be combined with a System Storage. On a mounting
frame with external casing, it contains a system controller with a Touch Display and a set of insulated hoses
for connection with a System Storage.
Illustration 9:
BRUNNER
Touch Display
Illustration 7: Hydraulic
Box external casing
Illustration 8: Hydraulic Box
with a Basic Module inside
2.4.2 Solid fuel module
The module for connection of a tiled stove or other solid fuel boiler type depends on the output rating of
the heating device.
© 2023 Brunner GmbH Instructions for Use BHZ 3.0 (6.14) 19

BPH inte-
gration
incl. perfor-
mance me-
tering
Module for
solid fuel
boilers
12-20 kW
or
20-30 kW
Module for
solid fuel
boilers
40-50 kW
Tiled stove cir-
cuit with
motorized re-
turn flow
increasing de-
vice and
performance
metering
2.4.3 Solar module
Solar module with separated systems
This solar module is foreseen for the connection of thermal solar sys-
tems (flat panel or vacuum pipe collectors) including separation of
systems via plate heat exchanger, with integrated heat output meter-
ing.
The powerful plate heat exchanger ensures efficient transfer of heat.
The heat transfer fluid in solar circuit is enriched with antifreeze solu-
tion (e.g. Tyfocor).
2.4.4 Module additional heating (Heat generator)
Module for connection of oil/gas boiler, or for other boiler types as well.
Header for oil/gas boiler etc.
without power measurement
20 Instructions for Use BHZ 3.0 (6.14) © 2023 Brunner GmbH