Schwank’s Radiant Tube Heaters provide a comfortable and economical heating solution.

Burner technology

Whisper-Jet - A premium class burner

The Whisper-Jet burner constitutes the core of Schwank radiant tube heaters. Its design is the result of decades of experience in dealing with gas-fired infrared radiant heaters and the constant striving for further technical advances.


During the engineering phase, state-of-the-art technologies and know-how have been adopted and applied. For instance, a pressure fan has been installed so that the flow characteristic of the gas-air-mixture is easier to influence in order to achieve a better and more uniform heat distribution. In addition to this, components such as the fan and its ball bearings are not exposed to the hot flue gas. This contributes to a longer life of these parts.


By means of various simulation tests, CFD [computational fluid dynamics] tests and the use of a patented Schwank ceramic burner tile, Whisper-Jet produces a very long and laminar flame. This flame runs through the radiant tube in axial direction thus distributing the heat in a more uniform way. This guarantees a continuous heat transfer from the flame over the entire length of the tube heater. 

By optimising the flow characteristic and using the pressure fan, Whisper-Jet is an exceptionally quiet burner. With approx. 46dB[A] at 3m distance, you will hear no more than a soft whisper.


The optional 2-stage or modulating operation of the burner further allows the control of the Schwank tube heaters to better match the actual heating requirement. This saves important resources and lowers the operating costs.


Benefits at a glance:


  • Long, laminar flame for improved heat transfer inside the radiant tube heater
  • Pressure fan design to increase the life cycle of components
  • Operation as quiet as a whisper through optimised flow characteristic inside the burner
  • 2-stage as well as modulating operation to reduce operating costs
  • Patented Schwank ceramic burner tile for the clean combustion of the gas-air-mixture



Whisper jet burner as used in Schwank tube heaters

Whisper jet burner diagram





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