A compendium of knowledge about HITZE fireplaces – Find answers to all your questions about our products.


In fireplace inserts and free-standing fireplaces, various manufacturers are trying to outdo each other in creating new designs improve parameters their own fireplaces by using an appropriate lining in the combustion chamber.

Combustion chamber in fireplace inserts and free-standing stoves, it can be made of vermiculite, cast iron, or storage material (fireclay and its derivatives). The use of the selected material is never accidental. Depending on the design of the fireplace, it is worth using different materials, which may be, for example: insulator, which is designed to ensure the highest possible temperature in the combustion chamber and transfer it to the heat exchanger, or an accumulation material that heats up evenly and slowly releases heat after the combustion process is completed.

Important it is also what function it will fulfill fireplacewhether it will be used as a typical heating device intended for long-term operation, whether it will have a decorative function, or whether it is air insert, Whether device with a water jacket with the selected exchanger type.

When it comes to lining of the combustion chamber there is no division into better or worse solutions, because each of the above materials has different characteristics and can be successfully used in various types of structures. It all depends on the type and purpose of the fireplace.


What accumulates heat better? When it comes to heat accumulation, it is in the fireplace, Whether free-standing stove fireclay works best.

Fireclay, which is a ceramic material, has a high heat capacity and is unique resistant to high temperatures and their rapid changes. Fireclay is more difficult to process and has a characteristic yellow color, which is not always desired by fireplace users.

Fireclay perfect for applications where high thermal stability is required. Its ability to release heat long-term and evenly makes it ideal for maintaining a constant temperature for a longer period of time.

A fireplace or free-standing stove may also have a lined hearth storage concrete. This material has a slightly lower heat capacity than chamotte, but is easier to shape and has an attractive, uniform color. However, storage concrete is less resistant to very high temperatures compared to fireclay, which is why fireplace manufacturers create their own mixtures enriched with various types of admixtures.


ACCUCERAM is an accumulative material used in fireplace inserts and free-standing fireplaces HITS. ACCUCERAM increases the temperature combustion in the furnace, which translates into lower exhaust emissions and clean glass. The material has excellent properties accumulation properties, thanks to which the fireplace remains warm even up to... several hours after firing it. ACCUCERAM also has the required mechanical strength, thanks to which it has increased resistance to impacts from pieces of wood.

The use of this type of materials causes rapid temperature increase in the combustion chamber and maintaining it at a high level for a long time, thus increasing the efficiency of the fireplace. Increasing the efficiency of the fireplace reduces the amount of fuel necessary to heat a given room, thus reducing the costs associated with operating the fireplace. Usage ACCUCERAM causes the combustion chamber to have catalytic properties. All tar and soot deposits are largely burned off.

ACCUCERAM it is a material that not only has excellent thermal properties, but also has a wonderful color, thanks to which the fireplace has a wonderful vision of fire when burning. HITZE has its own foundry where ready-made concrete and chamotte elements are made, which are then assembled in our plants fireplace inserts and free-standing fireplaces.


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