Harvia Plc and Toyota Motor Corporation teamed up to produce a concept model for what is believed to be the world's first H₂-powered sauna (as of this writing, according to the investigations of Harvia and Toyota). The collaboration represents a step toward a more sustainable future for saunas by combining Harvia's sauna expertise with Toyota's H₂ combustion technology.

The two companies will introduce the H₂ sauna concept at two upcoming events in Jyväskylä, Finland. These demonstrations aim to explore new uses for H₂ and contribute to carbon neutrality.

The H₂ sauna concept will be presented at the "World Sauna Forum" (June 4-5, 2025) and during part of "Rally Finland" (July 31-August 2, 2025) in Jyväskylä.

By applying H₂ to sauna heaters, the system generates only steam and warm air, emitting no CO₂ during use. This offers an attractive alternative to conventional heating methods.

The concept model aims to capture the essence of traditional smoke sauna, known for their gentle and soothing heat. The H₂ combustion heater channels flames and warm air through sauna stones, heating them evenly from all sides. This process envelops the space in a soft warmth and produces the pleasant steam, or löyly, when water is poured on the stones.

"This collaboration with Toyota allows us to push the boundaries of sauna innovation and demonstrate our dedication to environmental responsibility," said Timo Harvia, Head of Innovation and Technology at Harvia. "Toyota's deep expertise in H₂ handling and combustion gave us a safe and efficient way to pursue H₂ as a clean energy source―something we might not have considered this soon without such a trusted partner. In doing so, we are not only exploring ways to minimize environmental impact but also creating a new kind of sauna experience that honors tradition while embracing the future."

"Jyväskylä is a key location for Toyota and TOYOTA GAZOO Racing World Rally Team, with whom we have worked together for many years," said Mitsumasa Yamagata, President of H₂ Factory at Toyota. "This project builds on the strong trust established with the local community under the leadership of Chairman Akio Toyoda. Thanks to the initiative of the Central Finland Mobility Foundation, we've had the opportunity to partner with Harvia. Harvia's dedication to craftsmanship has been truly encouraging, and I believe this H₂ sauna opens new possibilities for the future of H₂ use."

Harvia, a global leader in sauna and spa experiences, is committed to advancing well-being through sustainable and innovative solutions. The company integrates environmental responsibility across its operations―from product development and manufacturing to energy efficiency and supply chain management―continuously seeking ways to minimize environmental impact while delivering high-quality wellness experiences worldwide.

Toyota views H₂ as an important fuel in pursuit of carbon neutrality and has been promoting various initiatives in the areas of "Create, Transport, Store, and Use" H₂ in collaborating with partners across various industries. Moving forward, Toyota will continue to accelerate the efforts to further promote H₂ utilization towards realizing a H₂ society.