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
Boilers & Heat Pumps

If you wish to switch to a lower-emission heating system, there are several options for generating heat with renewable energy for the benefit of the environment: pellet, log or heat pump heating.

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.


Cast iron and steel in fireplace and stove construction

Furnace systems come in a wide variety of designs. The stove body is either made of cast iron or steel sheet with a fireclay lining. Cast iron has always been one of the premium materials. It is the stove construction material with the highest thermal conductivity.

Non-deformable, robust and durable

The main difference to steel is the high proportion of carbon (over two percent), which is why cast iron cannot be shaped or forged, but only cast. It stretches and strains less than steel, less scaling occurs (only at around 800 degrees) and the fits are much more precise. Cast iron is mainly used for components that need to be particularly robust and durable.

Exchangeability of individual parts 

In former times, casting small parts was the only economical way to produce clean uniform parts. Steel sheet almost always requires a mechanical effort. Steel sheet fireplaces only became ready for series production and inexpensive to manufacture with CNC machines, but in terms of quality they are not on a par with those made of cast iron. Because the individual parts are screwed onto the sealing surfaces, individual parts of cast iron can also be easily replaced today if necessary.

Resistant even in the greatest heat

Inexpensive devices made of steel sheet are often made of the thinnest possible steel, which saves material costs, but bears the risk that the devices will warp or bulge with prolonged use, or the welds will crack and the doors will no longer close properly. Good steel appliances have an even surface and smoothly ground weld seams. While steel appliances can be damaged by incorrect heating, cast iron is virtually indestructible.

Specialist tip

It should be noted that cast iron takes longer to heat up, but then it also gives off heat for longer. With a steel fireplace it is the other way round. It heats up faster - but also gets cold again faster after operation. It is up to your own needs to decide which material suits you better.



Klaus Leihkamm, Head of craftsmen consultation & customer service


These articles might also interest you

Further articles on the topic of heating with renewable energies can be found here in our blog posts.

19. December 2022
Fireplace cladding
A fireplace cladding is what gives the fireplace its special appearance. It is like the individual f ...
Tiled stoves
Stove systems
5. December 2022
A water-bearing wood stove can do more
A water-bearing wood stove has two great advantages: Firstly, a lot of CO2 can be saved by heating w ...
Heating technology
Home automation
7. November 2022
Modern heating for the future
Modern heating for new buildings For a new building and a detached house, a pellet heating system i ...
About wood
22. September 2022
Wood moisture measurement
Whoever heats with wood knows: For a proper fire, the logs must be thoroughly dry. But what are the ...
Heating technology
23. March 2022
Alternative heating
When does a heat pump not make sense? But there are also disadvantages. Heat pumps are more expensiv ...
12. January 2022
Space-saving wood stove
There's room in even the smallest cabin, as the saying goes, and that also applies to a wood stove. ...
Heating technology
23. November 2021
Reduce electricity costs with heat pump stove heating
The colder the temperatures and the longer the winter, the deeper home-owners have to dig into their ...
Tiled stoves
Masonry heaters
Stove systems
27. February 2021
Avoid heating errors
Fireplaces and Tiled stoves spread pleasant warmth and a cosy atmosphere - provided they are operate ...
Tiled stoves
Masonry heaters
Stove systems
30. June 2020
Room divider fireplace and storage heater
Crackling fire, dancing flames that spread cosy warmth... everything bathed in a soft light. A wood ...
Heating technology
22. April 2020
An alternative to oil heating
Exchanging an old oil heating system for a more environment-friendly, modern pellet heating system h ...
About Brunner
29. August 2018
The name BRUNNER stands for a company with a passion for stove construction, fireplace construction ...
Order a brochure
You are interested in our products? We send you further documentation.
Order now