Our Heritage

In 1920, Fredrik Ljungström imagined how he could improve ventilation without losing heat, and two years later, the first Ljungström® air preheater was installed in a chocolate factory.

Over the first 10 years, 1,000 Ljungström air preheaters were delivered around the world, and today, more than 20,000 have been supplied.

It has been estimated that, since 1920, the use of Ljungström air preheaters has achieved worldwide fuel savings of over 5 billion tons of oil. The typical customer can see the cost of a preheater recovered after only a few months of operation.


Globally, Ljungström air preheaters save billions of dollars annually, and provides up to 25% less fuel consumption, contributing to a more sustainable and energy efficient world.


LJUNGSTRÖM has a long history of innovative problem-solving and customer service.


  • 1920 Frederik Ljungström invents the Ljungström air preheater in Sweden
  • 1925 The Air Preheater Corporation is created in the USA
  • 1927 Gadelius Shokai in Japan becomes a licensee
  • 1934 Kraftanlagen Heidelberg in Germany becomes a licensee
  • 1965 První brněnská strojírna (PBS) in Czeck Republic becomes a licensee
  • 1967 Stein Industrie in France becomes a licensee
  • 1977 Air Preheater Equipamentos Ltd (APEL) is established in Brazil
  • 1995 ABB acquires and combines all APH interests from USA, Japan, Germany, Czech Republic & Brazil
  • 1997 ABB acquires all global IPR to the Ljungström® technology
  • 1999 Creation of joint venture ABB ALSTOM Power
  • 2000 – 2013 ALSTOM acquires ABB’s JV share and operates the business as part of ALSTOM Power
  • 2014 ARVOS Group acquires the air preheater business and forms the LJUNGSTRÖM Division