International en
Austria de
Belarus en
Belgium en fr
Czech Republic en
Finland en
France fr en
Germany de
Ireland en
Lithuania en
Netherlands en
Norway en
Poland pl en
Romania en
Slovakia en
Slovenia en
Spain en
Sweden en
Switzerland de fr
Ukraine en
Home Technology
Become a conductor

Our BRUNNER home technology is practical, easy to use and full of benefits for the user. See what the abbreviations EAS, EOS and USA means and how you will enjoy using these "little helpers".

Secure guarantee extension now

Register your BRUNNER product within the first three months and you will receive a further warranty extension in addition to the usual BRUNNER warranties.

Log heating systems
Biomass: heating with renewable raw materials
To the Brochure

Log heating system

The most original way to heat with wood

Perfect for those who have their own wood

BRUNNER Heating systems are something special. With quality made in Germany, maximum efficiency and the best emission values, BRUNNER boilers are among the best of their kind. Heating the Bavarian way.

The personal declaration of independence, so to speak, for all customers who can and want to heat their house with their own wood. Inexpensive, with wood from your own or local forestry. The wood must be dried and stored accordingly.

  • Turnkey and reliable comfort solutions
  • Ideal for detached houses and apartment buildings
  • Suitable for new and old buildings
  • Combinable with photovoltaics or solar thermal energy
  • Eligible for subsidies
  • Made in Germany
BRUNNER has always attached great importance to designing its units to be extremely efficient and to keep emission values far below the legal threshold values.
The boiler is equipped with logs that measure half a metre in length. With a footprint of just under 1 m², the compact log boiler fits into almost any heating room, no matter how small.
Wood, a renewable resource, is becoming increasingly important. Heating with biomass is therefore very much in vogue - and the state is also promoting this with an attractive premium for heating system replacement.
Log heating system
BSV 20
Log heating system
BSV 30
Log heating system
BSV 40
Log heating system
BSV 50

Quality you can see and other technical refinements

Automatic ignition as standard

Large, solid cast-iron door with automatic door lock and particularly large filling chute

The large opening of the filling chute makes it particularly convenient to load the boiler with ½ metre long logs. The cast-iron door is self-adjusting, so that the door continues to close reliably and tightly even after numerous openings. The safety interlock protects against unintentional gas leaks during carbonation and the risk of deflagration. With a filling chamber volume of 170 litres (approx. 60 kg beech wood), the heating comfort is increased by long-lasting combustion and extended reheating intervals. The automatic, standard ignition in combination with the above-average filling shaft leads to top-class heating comfort. After the buffer tank has already been filled with one burn-off, the filling shaft is completely filled once again. If the buffer temperature falls below an adjustable level, the boiler then ignites automatically and fills the buffer tank again. This doubles the reheating interval - nothing stops a winter weekend excursion.

Log heating systems are comfortable

BRUNNER log gasification boilers have an integrated
ignition mechanism. Operating the cleaning mechanism and
the fuel feed with 40-80 kg wood is still manual work
- after that, everything is automatic. When heat is required, the
combustion is started and controlled over the entire period of approx. 5-10
hours with low emissions. In winter, the wood boiler
is heated daily or every second day. Instructions for cleaning
and ash removal are shown on the touch display in good time.

Sufficient space for water heating buffer tank

During combustion, a wood boiler generates significantly more
heat than is currently required. For the continuous
heat supply to the heating system, water heating
buffer tanks with a total volume of 2000-
4000 litres are installed. Heat surpluses are collected,
and distributed through the heating system when needed.

Replacement for the outdated log boiler

Wood boilers have to be measured
by the chimney sweep on a regular basis. In the case of old wood boilers, the emission specifications
according to the law are no longer complied with and the operating licence
expires. Modern log gasifiers fulfil all valid
threshold values and offer significantly more in terms of safety, reliability,
service life and ease of operation. The emission values are far below the threshold values required by the law without additional separation and filter devices. In customised versions for the existing boiler dimensions, they are placed close to the side wall. Handles and filling shaft door are made of cast iron design for frequent use.

Emissions and efficiency

The emission values are far below the strict legal threshold values without additional separation and filter devices. This once again demonstrates the outstanding combustion quality of all BRUNNER products. The boiler board includes as standard the control for boiler, heating circuits, hot water, solar and eventually auxiliary heating (e.g. existing gas or oil boiler). 

In conjunction with the BRUNNER heating centre the BSV log heating system can be extended and combined as desired: Hot water preparation via fresh water station, additional heating circuits, use of surplus solar power (PV integration). And all this with a single control and a uniform user interface: with just one glance at the glass touch display, you can see all the important parameters regarding the boiler status as well as buffer tank temperatures. A simple and clear display ensures self-explanatory operation of the entire heating system.

Touch display
Lever heat exchanger
Automated ignition
Air flaps with actuators and ignition
Ash pan
Filling shaft
Filling door with door pull made of cast iron
Maintenance-free and closing tightly - the spring mechanism integrated in the filling door remains reliable
Inspection door
Combustion chamber door made of cast iron
extensible ash tray
Control lever
Mechanical cleaning „heat exchanger“
Flow, boiler sensor
Lambda sensor, exhaust gas sensor
Flue gas connection Ø 150 mm
Heating gas recuperator (boiler)
Boiler insulation
Combustion chamber made of refractory concrete
Emptying boiler
The log boiler

Practical tips

The combustion is controlled by a lambda probe, a speed-controlled induced draft fan and electronically controlled air dampers. This leads to excellent fuel utilisation and increases the combustion quality. The heat exchanger cleaning system ensures that the effectiveness of the heat exchanger remains constant.
Air dampers with actuators and ignition as well as combustion chamber are visible from the front, individually accessible and thus extremely easy to maintain. The combustion air control via lambda probe and electronically controlled air dampers enable emissions that are significantly below the existing threshold values.

The assembly

Easy removal of the boiler from the transport pallet without special aids. The boiler can be installed in almost all cases without dismantling the boiler cladding. The lateral side of the door stop can be changed without any modifications to the drives.

Operation and maintenance

The BSV runs remarkably quietly and is designed for low-maintenance operation. With the integrated ash pan, ash removal is child's play. Of course, the boiler informs you via control panel or smartphone as soon as cleaning or maintenance is due.

The details make the difference


BRUNNER log boilers have an integrated, automatic ignition as standard. If the buffer temperature falls below an adjustable level, the boiler ignites automatically and heats up the buffer tank again. Practical, as there is always a complete boiler filling (approx. 60 kg of hardwood) on "standby". The reheating intervals can be extended and you can enjoy the weekend off.


BRUNNER log boilers have an interlock for the filling and combustion chamber door. Embedded in an integrated safety concept, smouldering gas leakage and the risk of deflagration can be minimised regardless of user behaviour.


Nearly all components can be reached from the front. The ignition element and servomotors are mounted behind the centre inspection door and are easily accessible. The hand lever for mechanical heat exchanger cleaning can be fitted on the left or right.

Everything on board

The boiler board contains the controls for the boiler, heating circuits, hot water, solar and other heat generators (e.g. existing gas or oil boiler) as standard. An existing heating system can be integrated into the system control.

Everything in view

Simple and intuitive operation

With the touch display, you always have your heating in view. All functions are displayed and operated centrally. In the online access to "my heating", the familiar display view is reproduced 1:1. Simply register with myBRUNNER and install the app. Access to your own heating is possible with any internet-capable end device.


A heating system that anyone can operate.

BRUNNER boilers have an integrated touch display. A quick glance is enough and the current heat situation of the building is recorded. All functions of the heating system - and not just those of the boiler - can be set and operated via the graphic interface. A second display with a white or black glass plate can be installed in the living room or entrance area. This way, you always have a quick overview of the current heating situation.

Wood requirement and fuel quality

The adequate fuel

If you heat with your own wood, you make yourself independent of fossil heat carriers. A modern wood heating system can also supply existing and large houses with heat sustainably and comfortably. When planning, the storage location and wood requirements must be taken into account. In general, modifications to the chimney are not necessary. BRUNNER wood heating systems can also be ideally combined with solar thermal, photovoltaic or other heat generators.

The annual wood requirement can be determined by the building standard and
the living space to be heated. For example, with a previous annual oil consumption of 1,500 litres, approx. 8 cubic metres of hardwood or 12 cubic metres of softwood are required per year.

If wood that is too moist, treated or varnished is burnt, deposits will form in the boiler and chimney. In addition to the cleaning effort, there are also increased emissions and signs of wear. The perfect wood stove uses natural logs that are split from 10 cm (3.93 inches) in diameter. In addition to dry logs, wood briquettes and untreated wood slats can also be burnt. Pellets or wood residues (shavings, chips) are best suited as a lighting aid, placed in front of the ignition element.

Concept 1

Log heater CLASSIC

The classic in the existing building with lateral storage tanks for heating and hot water. In the version with internal pipe coil exchangers, the solar thermal system is integrated. This version is provided with hydraulic components from the specialist trade.

  • Heating water storage tank up to 2000 litres capacity with integrated heat exchanger for solar thermal energy
  • Hot water storage tank with a maximum capacity of 500 litres and integrated exchanger for solar thermal energy
  • Optional photovoltaic and solar thermal energy for heating and hot water. (With solar heating, the second heating circuit is omitted on the control side.)
Concept 2

Log heater COMFORT

Whether renovation or new construction - the convenient solution with heating water storage tanks for heating and solar thermal energy. Contemporary supplemented with hot water preparation via fresh water module. This version is designed with hydraulic components from the specialist trade.

  • Heating water storage tank up to 2000 litres capacity with integrated heat exchanger for solar thermal energy
  • Expansion storage tank to double the storage volume
  • Drinking water heating as required (external fresh water module with plate heat exchanger)
  • Option photovoltaic and solar thermal energy for heating and hot water. (With solar thermal heating, the second heating circuit is omitted on the control side.)
Concept 3

Log heating system PLUS

Everything is possible. A sophisticated and pre-assembled heating system for complex heating technologies with different heat generators that is guaranteed to work. Ideal for apartment buildings, semi-detached houses, new buildings with granny annexes and sophisticated heating solutions with several heat generators.

  • Stratified storage tank with a maximum capacity of 2000 litres
  • Adapted expansion storage tank to double the storage volume
  • Pre-assembled Hydraulic box for several heat generators and consumers
  • Drinking water heating as required, principle "plate heat exchanger”
  • Optional photovoltaic and solar thermal energy for heating and hot water

How about an alternative heating concept?

Pellet heaters
This is how you heat today
Learn more
Water-bearing stoves
A stove as a hot water generator
Learn more
Heat pump
Now heat even greener
Learn more
  • BRUNNER log boilers are guaranteed to comply with the limits of the 1st BImSchV, stage 2, for carbon monoxide and dust.
  • Our wood gasifiers do not require any secondary measures such as additional fine dust filters or particle separators.
  • The patented lateral combustion of BRUNNER's wood heating systems have low emissions and are highly efficient.
  • This is how you heat today: BRUNNER log boilers have automatic ignition as standard.
  • Wood gasifiers from BRUNNER ensure lightning-fast heat demand at the desired time with minimal own power requirements and low standby losses.
  • BRUNNER log boilers are high-quality constructions made of robust cast iron from our own production.
  • Brunner grants a five-year guarantee on the entire wood gasifier without exceptions (with maintenance contract).
  • The straight-lined, timeless design of our log boilers has been awarded with the Iconic Award "Best of best" - in the truest sense of the word.
  • Extremely spacious and directly accessible filling chambers make it easy to fill and clean our wood gasification boilers. 
  • The combustion grate of the BRUNNER log boilers is designed as a tilting grate for convenient emptying of ash residues.
  • The added safety feature: The combustion chamber door of our log boilers only opens when in a functionally safe operating state.
  • Inadvertent opening during combustion with the risk of escaping flames and heating gases is thereby precluded.

The operation of the BRUNNER log boiler is simple and intuitive. All settings can be made logically and without instructions on the high-resolution colour display for viewing values such as status or boiler output. We only use as many technical terms as are actually required. Our in-house electronics department takes care of programming and perfectly tuning the control system.

  • Optional second glass touch display for living area; design in black or white available.
  • BUS-based system control and networking of all heating components.
  • Always up to date: Linus-based operating system; 1 GHz processor.
  • Graphical display of all processes as well as the current operating status.
  • Automatic archiving function of heat yields, sensor values, error and information messages.
  • Determination and balancing of heat yields.
  • PIN-code protected service level with analysis function.
  • Remote control via internet with PC, tablet or smartphone via myBRUNNER app.
Looking for the right heating system?

Make an appointment for a free consultation and let us work together to determine the ideal heating device for your home. We look forward to your visit.

Also use our social media channels to find out more.


Make an appointment

customer testimonials

That's what our customers say about BRUNNER

Show customer testimonials
A successful investment
Dear Sir or Madam After careful consideration, we decided to build an HK7 heating fireplace from Brunner and are happy with the decision. We would like to thank the stove building company Torsten Dix from 03205 Bronkow very much for the good advice and accurate execution on schedule. The fireplace is visually a modern jewel and ...
Schikorra Andreas
Competent service technicians can no longer be taken for granted today
Jochen Gräve, Niederwerth: Good morning, Yesterday, between 4:00 and 5:30 p.m., your service technician Mr. Kieswimmer changed the brackets on my masonry heater door and checked and readjusted various settings on the EOS. I would like to express my sincere thanks to Ulrich Brunner GmbH and especially to Mr. Kieswimmer for thi...
Jochen Gräve
After we got a new gas condensing boiler in 2017, Kachelofen Schulz from Rastatt-Rauental built a water-bearing heating fireplace for us at the same time. We are still totally enthusiastic about this combination, Mr. Schulz also showed us wonderfully how to fire optimally and burn wood effectively. Now we have obtained another B...
Weschenfelder Hanne u. Wolfgang
This year, in the summer of 2022, a new Brunner WF 33 insert was installed in my current tiled stove (36 years old) by the specialist company Schömig from Höchberg/Würzburg. Batch no. C011.002-05.000.787010. With the start of the heating season, our new WF 33 burns almost every day and we are every time more and more enthusiasti...
Körner Otmar
We heat the first winter with a stove installed by stove builder Stefan Hock from Bessenbach. Not only does the stove look great and fit perfectly into the picture, it also makes you really warm, and with far less wood than we needed before.
Krause Birgit
Better some euros more for the brand quality of BRUNNER
Ralf Lenz: Dear Ladies and Gentlemen, The chimney sweep just came. He wouldn’t believe that we had left our stove burning all winter. It turns out that it's better to spend a few euros more on brand quality such as a Brunner stove than to buy cheap junk. It pays off in the long run - and the environment is happy too :-) Cordia...
Ralf Lenz
Dipl.-Ing. Oberstudiendirektor
Ladies and Gentlemen, I am currently planning the installation of my second Brunner tiled stove with the expert advice of the master stove builder Josef Müller, Runding. For expert advice on the installation of the Brunner B4 in the existing heating system, I sought professional help from Brunner: Friendly reception, sound profe...
Mohr Heribert
The HKD 5.1 of BRUNNER is a product of top class
Michael Schmidkonz: Dear Ladies and Gentlemen, We have bought a Brunner HKD 5.1 tiled stove. It is a top class product. Whether for ignition, continuing to heat or keeping embers burning - simply outstanding! With kind regards from Tirschenreuth Michael Schmidkonz
Michael Schmidkonz
Corner fireplace of BRUNNER is the eye-catcher in the living room
Dr. Buch, Tutzing: Dear Ladies and Gentlemen, With the installation of the corner fireplace Architektur-Eck 38/86/36 from Brunner, our newly created living room has become a real eye-catcher. Without being obtrusive, it is a compelling fireplace installed in steel. The convincing quality-oriented technology and the perfectly...
Dr. Buch
Our tiled stove was put into operation 37 years ago. Our chimney sweep is very enthusiastic. He has also already taken measurements with my consent. Top values  
Kehl Herbert
Heating centre
Hydraulic box with system storage
Learn more
Water-bearing devices
Wood fire atmosphere with hot water generator
Learn more
For a flawless functioning of your heating
Learn more
Arrange a consultation appointment
Make an appointment
Order a brochure
You are interested in our products? We send you further documentation.
Order now