ThermaSol Launches Premium North American Sauna Line: Astra, Fortis, Ombra
Alongside the solar-powered Solaris, Harvia's ThermaSol brand launched three new premium indoor and outdoor sauna models for the US market in Q3 2025, marking the first full product extension since Harvia acquired the Texas-based steam specialist in 2024.
ThermaSol's premium sauna collection includes the Astra, Fortis, and Ombra models. The collection expands ThermaSol beyond its legacy steam shower category into traditional sauna rooms.
ThermaSol, the Texas-based wellness brand Harvia acquired for USD 30.4 million in July 2024, introduced a refreshed premium sauna collection in Q3 2025: the ThermaSol Astra, ThermaSol Fortis, and ThermaSol Ombra. The launch was confirmed as part of Harvia's Q3 2025 investor presentation on 6 November 2025. It is the first major product extension for ThermaSol since the Harvia acquisition and marks the brand's formal move from steam specialist into full premium sauna. (See every Harvia product launch and earnings event in our Harvia News hub.)
Three New Models, One Premium Positioning
The collection comprises three models positioned for the US premium sauna market. ThermaSol Astra, ThermaSol Fortis, and ThermaSol Ombra were all previewed in Harvia's Q3 investor deck with rendered product imagery, though full specifications, pricing, and availability dates were not published in the earnings materials. ThermaSol is expected to release complete product pages on its website alongside the commercial launch.
The positioning is explicit: premium North American sauna. Historically, ThermaSol's business was centered on steam showers, steam generators, ThermaTouch digital controls, smart shower components, and accessories, with a sideline in distributing indoor and outdoor saunas and traditional sauna heaters (including Harvia heaters before the acquisition). Under Harvia ownership, the ThermaSol brand is being extended into the full premium sauna category with Harvia Group engineering behind the new sauna models.
Strategic Context: Steam Specialist Becomes Full-Experience Premium Brand
At the time of the July 2024 acquisition, Harvia disclosed that over 90% of its revenue was coming from traditional sauna (not steam), and that building a meaningful steam presence in North America was a key strategic objective. The ThermaSol deal accomplished that instantly, giving Harvia the leading US residential steam brand, approximately 20% of the North American sauna market by type, and a nationwide network of plumbing wholesalers and kitchen-and-bath showrooms.
The Astra/Fortis/Ombra launch goes the other direction: it takes the existing ThermaSol brand equity and extends it from steam specialist into full premium sauna, pitching ThermaSol as a one-stop wellness brand for the premium US residential market. This is the "full sauna experience" strategy Harvia described at its Capital Markets Day 2024 applied in reverse: instead of adding steam to Harvia, Harvia is adding sauna to ThermaSol.
Cross-Sell Into the Existing Channel
ThermaSol's existing distribution is heavily weighted toward kitchen and bath showrooms, plumbing wholesalers, and high-end residential builders. These are channels where Harvia and Almost Heaven have historically been underrepresented. By extending the ThermaSol brand into sauna (rather than introducing Harvia or Almost Heaven branding into these showrooms), Harvia Group gets the premium sauna category into a distribution channel it did not previously serve, without forcing the showroom owners to stock a new brand name.
Harvia's Q1 2025 earnings call noted that the ThermaSol brand was "refreshed to build further excitement for our Steam and high-end product offering." The Astra/Fortis/Ombra collection is the product-side execution of that brand refresh.
Harvia spent a year integrating ThermaSol. The Astra/Fortis/Ombra launch, alongside Solaris, is the signal that integration is now translating into revenue growth. By extending ThermaSol into premium sauna rather than bolting Harvia branding onto the US market, Harvia gets to use the one thing ThermaSol has that Harvia does not: a nationwide high-end bathroom and plumbing showroom network that already moves premium wellness products into American homes. If this channel play works, ThermaSol becomes Harvia's second billion-dollar-TAM beachhead in the US, after Almost Heaven's consumer DTC and outdoor barrel sauna business.
Sofia Mäkelä
Industry Reporter, SaunaNews
Sofia Mäkelä is an industry reporter based in Helsinki with deep ties to the Nordic sauna manufacturing community. A graduate of Aalto University, she spent five years covering industrial technology for Kauppalehti before turning her focus to the sauna sector full-time. Her reporting on supply-chain dynamics and manufacturer strategy has broken several major stories in the trade press.
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