Electrical Air Heaters (HRR)

For heating air in ventilation and air conditioning systems, (paint) drying systems, shrink wrapping machines as well as in apparatus engineering and process engineering


T+H air heaters type HRR consist of tubular heaters or finned tubular heaters assembled into a sheet metal housing made of zinc plated steel or stainless steel. According to the requirements given by the specification the housings can be adapted to various applications as per the illustrations indicated beside. For most applications finned tubular heating ele ments are used as their increased surface area allows low surface temperatures on the heating elements thus providing a low watt density and a long lifetime with reduced housing dimensions.

By means of electrical interlock it has to be assured that the heater can only be operated when a fan has been activated. In order to prevent the air filter from overheating and to avoid a too high outlet temperature the air heaters can be equipped with a thermostat and/or a temperature limitor.

Configurations and Executions

Standard executions

In general we manufacture air heaters confrom to your specifiactions. For duct air heaters with air outlet temperatures less than 80°C the following dimensions of H are favorable because we can then possible employ standard air heaters.

Preferred dimensions H:

  • 250 mm
  • 320 mm
  • 400 mm
  • 500 mm
  • 630 mm
  • 800 mm

Possible configurations and specifiactions

  • Flange heaters HRF or HRF-AK
  • Cylindrical air heaters HRZ with the preferential diameters 100 mm, 125 mm, 150 mm, 200 mm, 250 mm and 300 mm
  • Heaters for higher air temperatures with set off terminal box (AK)
  • Protection degree of the connection box up to IP64
  • Air space sealed by welding
  • Insulation resistance > 10 MΩ
  • Silicone-free execution
  • Operating voltages between 24 V and 3 x 690 V
  • Specification of the circuit steps
  • Execution with thermocouple mounted at the air heater
  • Low temperatures at the heating element
  • Low pressure losses
  • For maritime applications, heaters conform to GL/DNV guidelines


The connection of the leads is effected by sheath clips, which are placed on the connections of the heating elements. Special executions over plug connectors at the housing or contact clamp blocks are possible.

Automatic controllers and/or limiters mounted by us are intended to integration into the control of the air heater. The automatic controller is usually used as safety feature which is switched first.


The housings are made of galvanized steel or high-grade steel 1.4301. The tubular heating elements are manufactured of high-grade steel 1.4541 and the finning is produced of high-grade steel 1.4541 or steel 1.0112.

Possible sheath materials of plane tubular heating elements:
1.4541, 1.4828, 1.4876 and 2.4858

Other materials on request.


You receive a data sheet of the desired heating element with a principle sketch and all important technical details.


All formulas for calculating the required power for heating air and gases can be found in the Catalogue Air Heaters.

Catalogue Air Heaters

In the catalogue you will find further information, technical data, pictures and drawings of our finned tubular heating elements and electric air heaters. It serves as a supplement to the information presented here on the website. Our catalogues are updated regularly.

Catalogue Air Heaters
Katalog Lufterhitzer / Catalogue Air Heaters

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Our offer for you

In order to submit a quotation or in case of an order we need the following data:

  • voltage
  • wattage
  • number of heated zones
  • air throughput
  • outside dimensions of housing
  • inlet temperature
  • outlet temperature or limitor
  • medium to be heated (aggressive medium)
  • quantity
  • with/without thermostat
  • configuration and execution


In our download area we have provided data sheets, assembly and maintenance instructions, drawings, dimension sheets and 3D models for you.