How Estonia Became the World's Sauna Manufacturing Powerhouse

If you have bought a premium sauna in the United States in the past five years, there is a good chance it was made in Estonia. The heater, the wood, the cabin, the smart controller: increasingly, all of it traces back to a country smaller than New Hampshire with a population of 1.37 million.

Estonia now has at least 34 sauna manufacturers shipping to more than 60 countries. Thermory, the world's largest producer of thermally modified wood, posted EUR 149 million in revenue in 2022. HUUM, the Tartu-based heater company, grew at a 115% compound annual rate over three years. Saunum Group took its patented air equalization technology public on Nasdaq First North in Tallinn. SaunaLife has become one of the most recognized outdoor sauna brands in North America. And a growing number of these companies are raising capital and shipping containers to New York, New Jersey, Texas, Chicago, and California.

This is not a fluke. It is the result of specific structural advantages that no other country replicates in combination: cheap labor inside the EU, vast certified forests, zero corporate tax on reinvested profits, a UNESCO-inscribed sauna tradition, and the most startup-dense economy in Europe. Here is how it happened and what it means for American sauna buyers.

Thermory Sets the Pace at EUR 149 Million

Thermory AS is the anchor of Estonia's sauna industry. Founded in 1997 by Meelis Kajandu as Brenstol, the company adopted thermal modification technology in 2001 and renamed itself Thermory in 2017. The real inflection point came in July 2018, when Thermory signed a merger agreement with Ha Serv, then Europe's largest manufacturer of sauna materials and ready-made saunas. Ha Serv owned the premium Auroom brand. PricewaterhouseCoopers and Deloitte Advisory handled the financials. Livonia Partners, a pan-Baltic private equity fund managing approximately $90 million across two funds, was Ha Serv's controlling shareholder.

"We have been competitors for over 20 years," Kajandu said at the time. "Together we can think bigger and faster develop our various business lines."

The combined entity scaled fast. Revenue hit roughly EUR 70 million immediately after the merger with over 500 employees. Thermory then acquired 100% of Finland's Siparila Oy (adding four factories and 130 employees), took full ownership of Latvian sawmill VMS Timber by December 2021, and invested EUR 7.5 million in a new thermal complex near Tallinn that doubled thermowood capacity at that plant. By 2022, the group reported EUR 149.3 million in revenue, EUR 10.1 million in profit, and 742 employees across nearly 10 factories in Estonia and Finland. More than 90% of production is exported.

For American buyers, the most relevant piece is Thermory USA, based in Batavia, New York, with about 27 employees. The subsidiary claims roughly 85% of the North American thermowood market and has nearly doubled in size annually. A centralized warehouse moved from Denver to Houston in early 2024. The Thermory 40 Series, square-profile outdoor saunas made from thermally modified Nordic spruce and priced from approximately $6,000 to $9,900, marks the company's push beyond raw materials into finished sauna products, often bundled with HUUM WiFi-enabled heaters.

Auroom: Where Saunas Become Architecture

The Auroom brand, now fully within Thermory's group, operates as a distinct premium division from its production facility in Vana-Kastre, Tartu County. With about 75 dedicated employees and annual capacity of up to 2,500 designer saunas, Auroom occupies the luxury tier. Italian designer Luca Donazzolo created the line's distinctive aesthetic, which ranges from the compact indoor Cala and Baia models to the flagship outdoor Natura and exclusive QUU series.

What sets Auroom apart is the bespoke ratio: 60% of production goes to custom solutions, and roughly 90% of standard models get adjusted to customer specifications. Every sauna undergoes trial installation and quality control before shipping. The brand serves high-profile hospitality clients including Six Senses Crans-Montana in Switzerland and Ryokan Shizuku Hotel in Japan, where 14 rooms were fitted with Cala Glass saunas. Products reach 30+ countries.

Because Auroom draws materials directly from Thermory's own thermally modified wood supply (thermo-aspen, thermo-spruce, thermo-alder), the value chain is vertically integrated in a way few competitors can match. If you are shopping for a luxury sauna with hospitality-grade build quality, Auroom is one of the names that keeps coming up.

HUUM: From $1.2 Million to a Projected $29 Million in Six Years

HUUM may be the purest expression of Estonia's design-meets-engineering sauna identity. Founder Siim Nellis is a third-generation stove builder. His grandfather Paul Nellis was a revered stonemason and builder of sauna stoves. Siim wanted to modernize but found his early electric heater prototypes uninspiring. In 2011, he walked into the Estonian Academy of Arts and challenged product design students to reimagine the sauna heater. Student Mihkel Masso proposed a wall-mounted hemisphere inspired by a water droplet. By 2012, the design was production-ready. It became the DROP, and it exceeded its first-year sales target by 400%.

The financial trajectory is remarkable for a hardware company. Revenue was approximately $1.2 million in 2019. Then the pandemic hit, and home sauna demand exploded. HUUM's stove sales surged 221% in March 2020. Revenue climbed to roughly $10.5 million by 2022, a 115% three-year compound annual growth rate. The North American subsidiary grew from about $500,000 in 2020 to $5.2 million in 2022. By 2024, HUUM reported $16 million in revenue with a 7% profit margin. An algorithmic forecast from Inforegister projects approximately $29 million for 2025, though that should be treated as an estimate, not confirmed guidance.

At the moment we don't need additional money from investors and can grow using our own resources.

Nellis's stated ambition: make HUUM the world's second-largest sauna heater manufacturer, behind only Finland's Harvia.

For US buyers, one specification matters more than any other. HUUM's SGS certification allows heaters to reach approximately 230°F, compared to the 194°F ceiling of standard UL-listed heaters. That 36-degree difference matters enormously to serious sauna users. HUUM invested over $60,000 in product certification for the American market. The company now holds three Red Dot Product Design Awards, for the DROP (2015), the CLIFF heater (2021), and the UKU controller (2021), making it responsible for three of only thirteen Estonian products ever to receive the honor.

Production is distinctly artisanal. Metal arcs for the DROP and HIVE heaters are individually cut and bent by hand. Final heater assembly happens in Tartu, while the UKU smart controllers are assembled in Parnu by partner Oshino Electronics Estonia. HUUM was the first company in the industry to offer smartphone app integration, back in 2014.

Saunum Group: Sauna Science on the Stock Exchange

Saunum Group trades on Nasdaq First North in Tallinn, an alternative growth market operated by Nasdaq for smaller companies. It is not the same as a main-market listing like Harvia's on Nasdaq Helsinki, but it gives Saunum public-company visibility and access to capital that most sauna startups lack. Founded in December 2014 by thermal engineer Andrus Vare alongside Lauri Meidla and Lauri Paeveer, the company developed a patented air equalization system in collaboration with Tallinn University of Technology.

The technology draws hot, oxygen-poor air from the sauna ceiling and blends it with cooler, oxygen-rich air from the floor, then distributes the mixed air at floor level. The result: temperature variation equalized by more than 60% across the room. An integrated Himalayan salt reservoir propels beneficial ions into the airstream. The system effectively turns a single heater into a five-in-one sauna (classical Nordic steam, wet steamy, mild relaxing, aroma, and salt ion) adjustable between 104°F and 194°F. Saunum holds seven industrial design patents.

Vare, who was "not particularly fond of saunas growing up," was inspired after inheriting his grandfather's century-old smoke sauna. The company's IPO in December 2020 was more than 10 times oversubscribed, attracting about $3.3 million in subscription orders from over 1,500 investors. Revenue grew from $2.4 million in 2022 to $4.1 million in 2023 (a 68% increase) and held at $4 million in fiscal year 2025. The company has been consistently loss-making but the trajectory is improving: losses narrowed from $1.8 million in 2022 to just $275,000 in FY2025, a 77% improvement.

Going public gave us a lot of fame. In addition, it has brought a certificate of quality. We are taken serious. There are no more questions about what kind of company we are and what is Estonia.

US customers can buy Saunum products shipped from the greater Chicago area. The company won the Interbad 2022 Most Innovative Product award in Stuttgart and two Golden Wave 2024 awards. For American sauna builders looking for a climate management system compatible with any electric heater, the AirSolo retrofit unit is worth investigating.

Perhaps the most telling endorsement comes from Finland itself. Lassi Liikkanen of Saunologia, one of Finland's most respected sauna researchers and consultants, has spoken favorably about Saunum's climate equalization technology in his reviews. For a Finnish sauna purist to recommend Estonian-made equipment over domestic Finnish brands says something about how far Estonia's engineering credibility has come.

The Emerging Wave: Haljas, SaunaLife, and the Volume Tier

Haljas Houses, founded in February 2021 in Tartu by Otto Taht, Karl Joonas, and Rauno Palmi, produces architecturally striking octagonal saunas featuring double-glazed tempered mirror glass: see out, but nobody sees in. Every unit ships fully assembled on cross-laminated timber panels, with 90% of materials sourced within a 19-mile radius. The company won Red Dot Product Design Awards in both 2022 and 2025.

Despite just five employees, Haljas has built an international distributor network spanning the US, UK, Australia, and eight other countries. Revenue has grown from $62,000 in 2021 to $650,000 in 2024. The flagship Hele Single starts at about $23,200 in Europe; in the US, the Hele Nano retails for approximately $54,900 shipped. These are statement pieces for high-end residential projects.

SaunaLife represents the other end of the Estonian spectrum: accessible, high-volume, and built for the North American backyard. The SaunaLife CL5G was the best-selling sauna on Sauna Marketplace and other top US retailers in 2025, and the brand's lineup runs from affordable X-Series indoor kits to the G-Series fully assembled outdoor saunas and the popular EE-Series barrels. Behind brands like SaunaLife sits a deep bench of Estonian contract manufacturers, many clustered in the southern counties of Polva and Voru. These factories operate production facilities of 40,000+ sq ft, employ dozens of skilled woodworkers, and have scaled from near-zero revenue to $6 to $8 million annually in under a decade, driven by the COVID-era home wellness surge. In November 2024, the World Sauna Group launched at the IPSP Expo in Dallas with a 3,500 sq ft booth, the largest in show history, displaying 15 Estonian sauna cabins from brands including Auroom, Haljas, and Saunum.

Why Estonia? The Structural Advantages

Estonia's sauna manufacturing success rests on a convergence of factors that no single competitor nation replicates.

The raw material base is extraordinary for a country this small. Annual wood product exports total $2.1 billion, or 10.7% of total national exports. Roughly 1,000 wood processing companies operate in the country, employing 38,000 people directly and indirectly. Sixty percent of forests are FSC certified.

The 0% corporate tax on reinvested profits, a flat-tax structure Estonia adopted in 1994, is a genuine competitive weapon. It allows manufacturers to aggressively reinvest in capacity and technology without immediate tax drag. Thermory's $8.2 million thermal complex expansion, HUUM's $60,000 US certification investment, Saunum's R&D collaboration with Tallinn University of Technology: all of these are easier when reinvested profits are not taxed.

Then there is the digital culture. Estonia produced Skype, Bolt, Wise, and Pipedrive. The country has 7.7 unicorns per million capita, the highest rate in Europe. That startup DNA shows up in how even traditional manufacturers think. HUUM launched the industry's first smartphone-controlled sauna in 2014. Saunum built patented climate equalization algorithms. Thermory runs paperless production at Auroom.

Geographic concentration amplifies everything. A southern Estonian manufacturing cluster spanning Voru, Polva, Tartu, and Viljandi counties puts multiple sauna factories within short drives of each other and the region's certified forests.

US distributors have noticed. Several of the top North American sauna distributors now have staff permanently based in Estonia or making regular trips to the country, scouting new products, auditing factory quality, and building direct relationships with manufacturers before competitors can. Having boots on the ground in Tartu or Voru has become a real competitive advantage in the US market, because the best Estonian products often sell out to European buyers before American distributors even hear about them. The companies that invest in on-the-ground presence get first access to new product lines, better pricing, and faster shipping commitments.

Cultural Credibility That Money Cannot Buy

In November 2014, UNESCO inscribed the Voromaa smoke sauna tradition, recognizing bathing customs, whisk-making skills, sauna construction, and meat smoking practiced by the approximately 75,000 people of the Voro community in southeastern Estonia. One in five farms in Voromaa still maintains a working smoke sauna.

Then came the documentary. "Smoke Sauna Sisterhood," directed by Anna Hints, premiered at Sundance in January 2023, won the Sundance Directing Award for World Cinema Documentary, and took the European Film Award for Best Documentary. It earned a 98% score on Rotten Tomatoes and sold distribution rights to 30+ territories. The film brought global visibility to Estonian sauna culture at precisely the moment when international demand was surging.

Celebrity helped too. David Beckham purchased an Iglucraft igloo-style sauna, built by hand in Leie village, Viljandimaa, for his Cotswold estate and posted about it to his 52 million Instagram followers. The roughly $15,200 sauna generated coverage across UK tabloids, Estonian media, and the wellness press.

How Estonia Stacks Up Against Harvia

Harvia, the Finnish sauna giant on Nasdaq Helsinki, reported $190 million in revenue for 2024 with approximately 700 employees and a $770 million market capitalization. Harvia's North American revenue alone reached roughly $67 million, larger than all Estonian sauna companies combined.

Estonia's largest player, Thermory, reported EUR 149 million in 2022 revenue, close to Harvia's scale. But most of Thermory's business is thermally modified lumber for decking and cladding, not sauna-specific products. In pure sauna equipment, HUUM at approximately EUR 14.7 million and Saunum at EUR 3.7 million remain small relative to Harvia. But the growth rates tell a different story: HUUM's 115% three-year CAGR through 2022 dramatically outpaces Harvia's normalized growth trajectory of roughly 10% annually.

The consolidation wave adds another dimension. KLAFS (Germany) was acquired by Kohler in January 2024 for an undisclosed sum, with approximately $147 million in revenue and 850 employees. Sauna360/TyloHelo was acquired by Masco Corporation in 2023 for $135 million. When major consumer goods companies are paying these prices, Estonian innovators start looking like attractive acquisition targets.

The Tariff Reality for US Buyers

Estonian sauna exports to the US face a turbulent tariff environment. In April 2025, the Trump administration imposed reciprocal tariffs on EU goods under IEEPA, initially at 20% before settling to 15% under a framework agreement. Section 232 tariffs on wood products, effective October 2025, added further duties on timber imports.

Then the legal landscape shifted. On February 20, 2026, the US Supreme Court ruled IEEPA tariffs unconstitutional in Learning Resources, Inc. v. Trump (6-3), and the government began processing refunds on the $166 billion collected. Within hours, the White House imposed a replacement 10% uniform tariff on all imports under Section 122 of the Trade Act of 1974. That tariff applies to every country equally and expires July 24, 2026, unless Congress extends it. For Estonian manufacturers, the current 10% rate is lower than the old EU-specific 15%, but the uncertainty is worse. Nobody knows what comes after July. Estonia's labor cost advantage partially offsets tariff friction, but the US market is significantly more complicated than the tariff-free European single market.