ThermaSol Solaris Named One of TIME Magazine's Best Inventions of 2025

ThermaSol, the US steam and wellness brand Harvia acquired in July 2024, landed on TIME Magazine's Best Inventions of 2025 list for the Solaris, a fully off-grid, solar-powered outdoor sauna. Harvia announced the TIME recognition as part of its Q3 2025 investor presentation on 6 November 2025. It is the first time a sauna product has made the annual TIME Best Inventions list. (See every Harvia product launch, earnings release, and M&A event in our Harvia News hub.)

What Solaris Is

ThermaSol Solaris is billed as "the first fully off-grid, solar-powered sauna available in the U.S." The sauna operates entirely without a power connection, drawing all operational energy from integrated solar collection. That makes it the first commercially available sauna in the North American market that can be placed in locations without utility-connected electrical service: remote cabins, off-grid homesteads, mobile wellness installations, glamping resorts, rural properties where trenching power is impractical, and any outdoor wellness setting where utility hookup is not an option.

Harvia's framing emphasizes "eco-conscious retreat in virtually any setting" and "freedom and flexibility" of placement. The product is marketed as a sustainability play (zero-emission operation, no grid electricity) and a practical deployment play (anywhere the sun shines). Complete US pricing, standard cabin sizes, solar array specifications, and session-per-day energy output numbers were not disclosed in the Q3 earnings materials. ThermaSol is expected to publish full specs on its website as Solaris becomes broadly available.

Why It Matters: TIME Best Inventions Is a Marketing Hit

TIME Magazine's Best Inventions list is widely syndicated and read well beyond the wellness press. A mention in TIME translates directly into organic search visibility, press replays across mainstream consumer publications, and retail interest from hotel groups, resort operators, and direct-to-consumer lifestyle buyers. For Harvia, Solaris hitting the TIME list is the single biggest North American marketing moment for the ThermaSol brand since the acquisition closed. It validates the deal thesis of combining ThermaSol's American product and distribution platform with Harvia Group's R&D depth on energy systems and sauna engineering.

The Solaris announcement is part of a broader ThermaSol product refresh under Harvia ownership. The Q3 2025 presentation also introduced the ThermaSol Astra, ThermaSol Fortis, and ThermaSol Ombra as part of a premium North American sauna collection. ThermaSol's brand identity was refreshed in 2025 to carry both the expanded premium sauna portfolio and the continuing steam generator and smart shower business the company has built since 1958.

The Energy-Technology Pivot

Solaris fits into a broader Harvia theme flagged in its Q3 2025 materials: "pioneering future energy technologies, including hydrogen and solar powered saunas." The company signaled in investor communications that it is exploring alternative energy sources for sauna operation beyond grid electricity and wood, with solar and hydrogen as the two identified frontiers. Solaris is the first commercial product to come out of that program. Hydrogen-powered sauna prototypes have been mentioned but not yet commercialized.

The strategic logic is straightforward. Sauna is fundamentally an energy-intensive product (heating a room to 175-plus degrees Fahrenheit requires substantial wattage), and the long-term trend in consumer expectations is toward lower-carbon operation. Being first with a credible zero-carbon outdoor sauna establishes Harvia's engineering reputation and locks up intellectual property before competitors respond.