Alfa Laval has launched the Hukka-5, an advanced exhaust gas steam boiler aimed at enhancing waste heat recovery and energy efficiency for cruise ships and passenger ferries. Introduced at SMM 2026 in Hamburg, this innovative boiler employs an inverted downward natural circulation design, allowing it to effectively capture heat from engine exhaust gases while maintaining a compact footprint. The Hukka-5 is now available for project orders.
This new boiler utilizes a downward-flow configuration, which promotes counter-current flow within the limited space of ship funnels, thereby minimizing the boiler’s overall size. This design also addresses potential flow instability in evaporative circuits, particularly beneficial for vessels using alternative fuels where exhaust conditions may vary. Targeted primarily at four-stroke engine applications, the Hukka-5 is ideal for cruise ships and ferries that frequently dock at ports.
The modular architecture of the Hukka-5 allows for customization based on specific vessel needs, including the capability to integrate electrical steam generation without the need for additional pressure vessels. This flexibility supports steam production during port stays when shore power is accessible. Furthermore, the boiler can be equipped with multi-stage heat recovery options and an optional condensing cold-end design, enhancing energy recovery from exhaust gases.
As part of Alfa Laval’s Hukka range, the Hukka-5 is compatible with engines running on various fuels, including methanol and hydrogen, addressing the growing need for emission reduction in maritime operations. With over 1,300 waste heat recovery boiler installations since 2000, Alfa Laval’s systems reportedly reduce CO₂ emissions by over 10 million tonnes annually, making the Hukka-5 a significant addition to future cruise and ferry projects.
