For quick and accurate design of Hoval energy recovery systems, use the Hoval CASER (Computer Aided Selection of Energy Recovery) design program.

Up to 7% more effective rotation exchanger surface, therefore lower pressure drop and higher efficiency
Extremely stable new Hoval rotor casing, therefore high operating reliability
Gotthard now available for air flow rates of up to 24,000 m³/h thanks to combined solution
All Gotthard sizes available with temperature efficiencies of 73% (ErP) and 80%

Selection program for energy recovery systems

  • Secure planning thanks to reliable data (Eurovent- and TÜV-certified)
  • Calculation of a specific Hoval plate heat exchanger or rotary heat exchanger
  • Calculation of all appropriate Hoval plate heat exchangers or rotary heat exchangers for a specific project
  • Efficiency class in accordance with EN 13053
  • Calculation mode “73 air” according to the Ecodesign Directive ErP 1253/2014 (only for plate heat exchangers, for explanation see 1.3)
  • Frost limit (only for plate heat exchangers)
  • Pressure drop increase due to differential pressure (only for plate heat exchangers)
  • Calculation of the performance figures for OACF (Outdoor Air Correction Factor) and EATR (Exhaust Air Transfer Ratio);
  • Simplified ordering process due to optimised type code
  • Price calculation
  • Languages: English, German, Italian, Turkish, Swedish, Slovak, French, Chinese.

System requirements

Processor 1 GHz or faster x32- or x64-bit   processor
Calorifier 1 GB RAM (32-bit) or 2 GB RAM   (64-bit)
Hard disk About 120 MB available
Monitor 1024x768 or higher resolution
Operating system   Windows 10 (32- or 64-bit)
Web browser
(for CASER
Microsoft Edge
Mozilla Firefox
Not compatible with Google Chrome

Hoval CASER update


  • Bug fixes

Plate heat exchanger

  • Gotthard combiblocks are now selectable with bypass and control damper can be configured up to a width of 2850 mm
  • Amended air flow ratio of up to 1:5 between supply air and extract air
  • EATR (Exhaust Air Transfer Ratio) and OACF (Outdoor Air Correction Factor) values on printout
  • Optimised type reference for Gotthard Combiblock

Rotary heat exchanger

  • New series of Viskan condensation wheels; ST3 design with 4 new, additional wave heights
  • Up-to-date EATR and OACF values

Desgin ST3
1piece wheel up to Ø 2600 mm orderable from 1st September 2021
Segmented wheel Ø 0950 – 4200 mm orderable from 1st December 2021



Optimisations of Hoval CASER

Plate heat exchanger

  • New definition: Instead of plate spacing, now performance values, currently P1 to P4
  • New Gotthard P4 range (efficiency range 80%)
  • New combined Gotthard Solutions (air flow rate now up to 24,000 m³/h possible)
  • Combined Gotthard solutions with TÜV certificate
  • Number of actuators is listed  in technical data sheet
  • "Optimal" order  quantity added for Gotthard (pallet order)


Rotary heat exchangers

  • New very stable baffle plate  and profile casing with new naming scheme
  • Up to 7% more effective  rotation exchanger surface, therefore lower pressure drop and higher efficiency
  • Highly-efficient step motors  with optimal torque progression