Air Preheater

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. We manufacture our air preheaters in modern facilities based around the world and produce bisector, trisector and quadsector arrangements. We can also provide packaged solutions in either vertical or horizontal alignment.

Our proven VN sealing system ensures that Howden heaters have minimal leakage and thus significantly reduce your operating costs. Other benefits of the VN design include a central drive system, advanced cleaning systems and enhanced maintainability.

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.

APH Bi-sector

Our brands

  • Howden

  • Sirocco

  • Tallares Sanchez Luengo (TSL)

  • Rothemühle

Our services

  • Full revision service of our own branded heat exchangers and other brands too

  • Inspection service and damage analysis

  • Remote engineer support contracts

  • Full service contracts designed to maximise lifespan

Why choose Howden Air Preheaters?

Our experience

The first company to form a joint venture with Fredrik Ljungström, we have been designing and improving rotary heat exchanger technology ever since.

Research and development

Continual research, development and analysis of both new and aftermarket heaters to optimise product performance and reliability.

Reputation for quality

We are accredited to ISO 9001, ISO 14001 and OHSAS 18001 and are regularly audited by major customers and internationally recognised assessment organisations.

Global Presence, Local Service

In our experience, there is no substitute for local support; that’s why we have local teams ready to help.

Modern manufacturing

Our state of the art production facilities are staffed by experienced engineers and fully qualified operators.

Element design

We have a wide range of profiles available, enabling us to offer the right balance of thermodynamic performance, pressure drop and ease of cleaning for any situation.

Air Preheater documents

Click the button below to read our air preheater brochure.


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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Enhancements and Upgrades

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.