Air Preheaters

Increase combustion efficiencies

Howden was the first company to form a joint venture with Fredrik Ljungström.  Since then, we have been designing and improving rotary heat exchanger technology through continual research, development and analysis of both new and aftermarket heaters to optimise product performance and reliability.
Rotary regenerative air preheaters have a much reduced size and cost relative to recuperative tubular or plate heat exchangers.
Howden's air preheaters are engineered to meet the demands of your application.
Using specialised software we can model and accurately predict the operational and cost advantages of our proposals. Environmental considerations and energy costs make it more important than ever to ensure air preheaters are working at optimised levels.
Our service capability encompasses all rotary heat exchangers with our own brands being Howden, Sirocco, Tallares Sanchez Luengo (TSL) and Rothemühle (including LUGAT).


Key Services

  • Bisector, trisector and quadsector arrangements
  • Vertical or horizontal alignment
  • Wide range of element profiles available based on our own design
  • VN sealing system
  • Central drive system
  • Advanced cleaning systems


  • Flexible configurations to best suit site and duty
  • Element range offers the right balance of thermodynamic performance, pressure drop and ease of cleaning for any situation
  • Howden heaters have minimal leakage and thus significantly reduce your operating costs
  • Enhanced maintainability

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Case Studies


Almeria case study

The introduction of Howden’s VN seal system to the air preheaters brought an immediate drop in leakage level from 26% to 5%.

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Sanguesa case study

At Howden, we have developed a range of element profiles, materials and coatings designed to offer optimum longevity and cleanability in every situation.

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Itabo I case study

Replacement of primary plate heaters with Howden custom designed rotary air preheaters, greatly improving thermal performance.

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Springerville case study

When Tucson Electric Power (TEP) Springerville Station was experiencing major air leakage issues, they called on Howden to rectify the situation.

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Retrofits and Solutions


The leading manufacturer of heating elements irrespective of the original manufacturer.

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It’s our duty to offer only the very highest standards of service whatever their needs, from initial installation of plant and equipment through routine maintenance to subsequent refurbishment and enhancements.

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Technology and Experience

Over the many years of our ongoing heater applications experience, Howden have investigated and developed important innovative solutions including leakage sealing systems, cleaning systems and intelligent monitoring.

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Parabolic Sectorplates

Through continued innovation, Howden have developed the latest Rotary Heater leakage reduction method – Parabolic Sectorplates. Hot End Sectorplates are structurally designed with variable stiffness to deform parabolically, when actuated, to match the shape of the deformed operating rotor. Thereby minimising the hot end leakage gap.

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If you would like to submit an enquiry please get in touch.