STELA air heaters are used to generate hot air in agricultural and industrial processes. They are suitable for firing oil or gas fuels but also for firing renewable raw materials.

Essentially, there is a technical distinction between two types of air heater:

Direct air heater

Direct STELA air heaters are fired by oil or gas fuels. They are used to create hot air for STELA drying systems and for use in other industrial processes, such as the brick-making industry.

Hot air generation with direct air heaters

The direct air heater consists of an outer casing, an intermediate casing to prevent radiation losses and a perforated firing chamber made of heat-resistant steel, which is located in the centre of the casing. The hot combustion gases are mixed with the fresh air heated on the wall of the firing chamber, and hot air with an even temperature is generated. The combustion energy is thus fed directly into the dryer. The technical firing efficiency is 100%.

Indirect air heater

Indirect STELA air heaters are used in processes in which the mixture of flue gas with the air to be heated is undesirable. STELA air heaters are TÜV-tested and meet the limits of even the most recent BImSchV with efficiencies of over 91%. All indirect air heaters can be switched to direct mode

Hot air generation with indirect air heaters

The indirect air heater consists of an outer casing, an intermediate casing to prevent radiation losses and a perforated firing chamber made of heat-resistant steel, which is located in the centre of the casing. The hot combustion gases are mixed with the fresh air heated on the wall of the firing chamber, and hot air with an even temperature is generated. The combustion energy is thus fed directly into the dryer. The technical firing efficiency is 100%.

BTU RecuDry 1-6200-33
in Poland

Product: RDF
Dryer output capacity:
RDF: 7.5 t/h from 55 % to 10 %

BTU RecuDry 1-3000-15
in Italy

Product: Sawdust
Dryer output capacity:
Sawdust: 2.1 t/h from 50 % to 10 %

BTU RecuDry 1-6200-25.5
in Austria

Product: Sawdust
Dryer output capacity:
Sawdust: 6.8 t/h from 50 % to 10 %

BTU RecuDry 2-6200-34.5
in Austria

Product: Sawdust
Dryer output capacity:
Sawdust: 13.5 t/h from 50 % to 10 %

BTU RecuDry 1-6200-28.5
in Latvia

Product: Sawdust
Dryer output capacity:
Sawdust: 7.5 t/h from 38 % to 2 %

BTU RecuDry 1-6200-45
in Sweden

Product: Sawdust
Dryer output capacity:
Sawdust: 10 t/h from 52 % to 10 %

BTU RecuDry 1-6200-54-18-18
in Germany

Product: Sawdust
Dryer output capacity:
Sawdust: 17.6 t/h from 46 % to 16 %

BTU RecuDry 1-6200-33
in Norway

Product: Sawdust
Dryer output capacity:
Sawdust: 10.6 t/h from 53 % to 10 %

BTU RecuDry 1-6200-30-10-10
in Slovakia

Product: HolbioSäg
Dryer output capacity:
HolbioSäg: 8 t/h from 50 % to 10 %

To the references

Get in contact

*mandatory field

Contact person

Low temperature, continuous dryer, circulating dryer – not sure what’s the best choice for you? Our experienced colleagues will be happy to help you find the best solution for your product. Please feel free to contact us without obligation.

Telephone +49 8724 899-10
Email sales[at]stela.de