We have been producing rotary regenerative heat exchangers for more than 30 years. During this time, we have gradually developed into a globally known manufacturer of heat recovery exchangers.

Kastt’s highly efficient rotary heat exchangers are an energy-saving solution for all ventilation and air-conditioning systems, from small apartments, through office spaces, production halls to special industrial applications and the largest industrial buildings.

Kastt rotary heat exchangers stand out for their cutting-edge technology, production precision and, above all, their unique heat and moisture transfer efficiency. Thanks to innovation and continuous development, we always try to be one step ahead.


KASTT’s highly efficient rotary exchangers belong to the top of the heat recovery market. They are designed to ensure energy savings for all ventilation and air-conditioning systems, from small apartments to office spaces, hospitals, schools, production halls, to special industrial operations.

KASTT rotary heat exchangers stand out for their cutting-edge technology, production precision and high energy saving efficiency. Thanks to innovation and continuous development, we always try to be one step ahead. At the same time, we are able to adapt to customer requirements and needs.

The main advantages of regenerative heat exchangers

  • High thermal energy transfer efficiency (heat and cold)
  • The ability to simultaneously transfer heat energy and moisture
  • Low susceptibility to rotor icing
  • Small installation width in air-handling units

The design of KASTT rotary exchangers is optimized as much as possible to achieve maximum efficiency of heat and moisture recovery – up to 90%, thereby significantly reducing environmental impact.

The largest possible diameter of the exchanger rotor, up to 5 m, represents approx. 150,000 m3/h of nominal air volume.

The principle of rotary regenerative exchangers

Rotary regenerative heat exchangers work on the principle of energy accumulation – alternating transfer of energy contained in the exhaust air to the storage mass and subsequent transfer of this energy to the supply air. The exchanger is being regenerated.

Regeneration versus recuperation

Recuperation: Rotary regenerative heat exchangers are often mistakenly called recuperators. . In recuperative heat exchangers (cross plate heat exchangers in most cases), both air streams are separated by a solid wall. They work on the principle of heat transfer by conduction in the thin wall of the exchanger (through its heat exchange surface).

Regeneration: The great advantage of rotary regenerative heat exchangers is that, in addition to the transfer of heat energy, they can also transfer moisture, and in addition to sensible heat, they also transfer bound heat. In this way, they achieve the highest efficiency from heat recovery systems.

More information on terminology can be found in the Glossary.



BASIC version represents the simple and economic design of the rotary heat exchanger cabinet. It is characteristic by its simplicity, small dimensions and low weight.


Ideal design of a rotary heat exchanger for all applications that require higher rigidity and flexibility of construction. May be encased in a housing consisting …


The welded design of the KASTT rotary heat exchanger cabinet represents the most rigid and reliable option for the most demanding conditions.



The completely new design of KASTT rotary heat exchangers represents a new trend in air handling unit design. Low pressure loss, optimal heat and moisture transfer efficiency, …


The new H-Wave rotor has the potential for the highest heat and humidity transfer efficiency. The newly developed waveform is a major factor in optimizing …


The divided rotary regenerative heat exchanger is ready for assembly from only two basic parts. This progressive solution completely changes the present approach to …


The most efficient sealing in the market. This solution considerably reduces the overall untightness of rotor, up to 1.5 % of air volume at maximum.


The latest technology of humidity transfer with a unique hygroscopic layer consisting of a molecular sieve. Healthier environment at construction sites = 4Å – ZEOLITE.


Fully automatic cleaning system for rotors of rotary heat exchangers intended for use in highly contaminated environment.


The heat exchanger drive consists of an electric motor with a gearbox, pulley and belt. KASTT offers its product range of rotary heat exchangers with standard AC motors, special AC motors …


KASTT rotary heat exchangers have been continuously developed. This is why we are also regularly updating our own design software.