Inside Harvia’s Five-Factory Global Manufacturing Network

Harvia runs five core factories across three continents, each specialized for a different product category or regional market. The footprint is how a single company can serve Finnish household saunas, American barrel sauna buyers, German spa projects, and Japanese commercial installs out of different plants, all with local content. Harvia credits the network and its logistics partners with keeping service levels up through the supply chain shocks of recent years, including COVID, political strikes and Red Sea freight disruption. (See every Harvia news story, earnings release, and M&A event in our Harvia News hub.)

Muurame, Finland: what Harvia calls the world’s largest sauna heater factory

The Muurame facility is Harvia’s headquarters. The plant produces more than 150,000 heaters per year, a figure Harvia management disclosed at its Capital Markets Day 2024, where it called Muurame the world’s largest heater and sauna component factory.

Muurame is the primary production site for Harvia’s flagship electric heater lines: the Cilindro pillar heater, the Virta Pro commercial series, the Legend wood-burning stoves, and volume models like Vega and Forte. The plant also produces sauna components (heater stones, control units prior to the sentiotec integration, and heater enclosures) and is the central logistics hub for Harvia Group purchasing in Europe.

In 2023, Harvia invested in new automated production cells and industrial production robots in Muurame, adding capacity without adding headcount. The company also moved wood-burning heater manufacturing almost fully to Muurame from subcontractors during 2023 after its exit from Russia in 2022 (Russian subcontractors had previously handled part of this workload). Aluminum stove production for Scandinavian hot tubs was also reshored from Estonia to Muurame in 2023 for quality control reasons.

Lewisburg, West Virginia: North America’s sauna room factory

Harvia’s Lewisburg plant, operating under the Almost Heaven Saunas brand acquired in December 2018, produces more than 10,000 saunas per year and is Harvia’s largest sauna room factory globally. It serves almost exclusively North America, a region that has grown from EUR 3 million (2018) to EUR 43.4 million (2023) and EUR 75.8 million (2025).

The plant handles volume manufacturing of outdoor and indoor sauna rooms, including barrel saunas (Almost Heaven’s signature product; Harvia’s CMD 2024 deck says Almost Heaven has been in the North American market since 1977), cabin saunas, and the hybrid traditional-plus-infrared saunas launched in 2023. In Q1 2024, Harvia purchased about 21.5 acres of additional land around the facility, which points to capacity expansion within two years. At Q3 2025 results, Harvia reported work to expand the Lewisburg facility as part of its investments to improve operational efficiency.

An automated painting line installed in recent years was flagged at Harvia’s Capital Markets Day 2024 as a key productivity driver, along with general factory automation. Harvia had 76 employees in the United States at year-end 2023.

Gheorgheni, Romania: Europe’s sauna room factory

The Gheorgheni plant in Transylvania is the sauna room factory Harvia describes as serving especially the European market. Romania offers Harvia a lower labor cost base within the EU, avoiding any customs complications that production outside the EU would create for the Continental European customer base. Harvia had 67 employees in Romania at year-end 2023.

Guangzhou, China: volume heaters and components

Harvia runs a heater and component factory in Guangzhou, China, which its Capital Markets Day 2024 presentation describes as specialized in volume heaters and components and also serving Group purchasing. Alongside it sits a Hong Kong sales and trading entity. Harvia’s 2023 annual report says the company introduced heaters and other products designed to Japanese specifications that year. It does not say which plant builds them.

Driedorf, Germany: EOS premium manufacturing

The Driedorf facility is where the EOS Group, acquired by Harvia in 2020, manufactures its full premium product portfolio. EOS, founded in 1944, is by Harvia’s description the number-one premium sauna heater producer globally, with an estimated 60% share of the premium segment in Germany alone. The Driedorf line produces EOS-branded sauna heaters (including the premium S-line, “underbench” and “behindbench” hidden installations, and the Structure heater launched in 2023), Kusatek gas-fired sauna heaters (Harvia describes EOS as the only relevant gas-fired premium sauna heater producer in the world), Spatronic electronic control units, steam generators, and infrared hardware. All EOS products are developed and manufactured in Driedorf with the “Made in Germany” positioning intact.

In Q3 2025, Harvia disclosed it was investing in a new energy-efficient coating system in Driedorf, part of a broader capital deployment to modernize the EOS line. Harvia had 116 employees in Germany at year-end 2023, and the facility is the technology center for Harvia Group in control electronics through the Spatronic integration.

Round Rock, Texas: ThermaSol assembly (added July 2024)

After closing the USD 30.4 million ThermaSol acquisition on 31 July 2024, Harvia added a sixth production facility to its network: ThermaSol’s design and assembly operation in Round Rock, Texas, near Austin. ThermaSol manufactures steam generators, smart-shower controls, the ThermaTouch control platform, and related steam-room hardware for the North American residential steam market. It is Harvia’s second US manufacturing site after West Virginia, giving it hubs in both the Southeastern United States (Lewisburg) and the Texas-Central corridor (Round Rock). ThermaSol employs approximately 40 people.

Italy and Estonia: specialized component sites

Alongside its five core factories, Harvia operates smaller specialized sites. The September 2023 acquisition of Phoenix El-Mec, an electromechanical timer switch maker in Belluno, Italy, added vertical integration for a critical heater component. Kirami, acquired in 2021, continues to manufacture Scandinavian wood-fired hot tubs in Sastamala, Finland and partly in Estonia through Metagroupp OU. In Austria, Harvia has a sales and customer service company and a logistics center, not a production site.

Logistics: own centers in Europe, the US and Asia

Head of Operations Mika Suoja described Harvia’s logistics at Capital Markets Day 2024 as “agile transport network” backed by own logistics centers in Europe, the United States, and Asia. Road, sea, and air transport are coordinated through a tight partner network that Harvia credits with getting it through COVID disruptions, the Russia exit, and Red Sea freight problems without meaningful customer service level deterioration. Harvia’s sales and operations planning (S&OP) process centralizes demand forecasting with daily order intake analysis and comparisons against consumer indexes to pre-position inventory.

Two thirds of Harvia Group’s personnel are blue-collar workers, according to CMD disclosures. Average annual productivity improvements have exceeded 5% per year over the three years ending 2024, and automated production cells have enabled over 25% capacity expansions without proportional headcount increases.

What the network gives Harvia

The multi-factory structure backs Harvia’s stated ambition to consolidate the fragmented global sauna market and gives it four advantages over competitors that build in a single plant.

Tariff insulation. Harvia can route production for any major market into a local or friendly-tariff facility. US-sold saunas can be built in West Virginia, and steam products assembled in Texas. European saunas can come from Romania, and premium heaters from Germany. Competitors shipping everything out of a single country face much higher tariff exposure. (See our analysis of sauna brand tariff exposure.)

Labor and cost flexibility. Production can flex between Finland, Romania, and China based on labor cost, available skills, and lead-time requirements. Volume components come from Guangzhou; premium controls come from Driedorf.

Risk management. When Harvia exited Russia in 2022 (where it had EUR 7.5 million of 2022 revenue, falling to zero by 2023), the company had the capacity in Finland, Romania, and Germany to absorb displaced demand and subcontractor workloads.

Acquisition integration. Harvia has integrated seven acquisitions since 2018 (among them Almost Heaven 2018, EOS 2020, Kirami 2021, Phoenix El-Mec 2023 and ThermaSol 2024) while keeping adjusted operating margins above 20% in every year from 2020 through 2024, with the factory network absorbing new production lines.