Saunum Turns to Tallinn University to Prove Its Sauna Does More Than Move Air

Saunum can already prove what its heaters do to the air. The Estonian company spent its first decade measuring it: superheated air trapped under the ceiling, cool air pooled at the floor, and a patented device that mixes the two so the temperature at a bather’s head and feet sits far closer together. What it cannot yet prove, with independent data, is what that evener heat does to the person sitting in it. Closing that gap is the point of a new research partnership with Tallinn University.

Saunum’s head of product development, Ardi Lippur, made the case at Tallinn University’s summer partner meeting, held this summer in the glass Orangerie at Kadriorg in Tallinn. In the university’s written recap, published July 2, Lippur said Saunum treats it as essential that claims about its products rest on scientific evidence, and that it sees the university as the natural partner for producing it. Saunum put the same idea more plainly in its own account of the visit. “Scientific research helps us understand [the technology’s] real impact on human physiology and recovery,” the company wrote, adding that pairing engineering with research lets it “validate our innovations with real data.”

Two universities, two kinds of proof

Saunum was one of three companies, alongside the software firm Claricy and the natural-cosmetics brand Berrichi, invited to speak about working with the university, and the meeting opened with remarks from the rector, Priit Reiska. The detail that makes it a story is which university.

Saunum’s core technology came out of Tallinn University of Technology, or TalTech, the country’s main engineering school. The company’s founder, thermal engineer Andrus Vare, has told the origin story in Saunum’s product literature: “My development work was supported by research done alongside Tallinn University of Technology, in which we analyzed the thermal stratification and air movement in the sauna room. Saunum was born in cooperation between scientific thinking and technological innovation.” That work answered an engineering question, how to even out a sauna’s temperature gradient.

Tallinn University is a different institution, oriented toward the natural sciences, health, and human behavior rather than mechanical engineering. Sending the physiology question there, instead of back to TalTech, is the tell. Saunum is no longer asking whether its air-blending sauna equipment changes the air. It is asking whether the changed air changes the body.

What Saunum can already show

On the engineering side, Saunum has numbers. In its own published comparison, a traditional Nordic sauna set to 176°F runs about 226°F at head height and roughly 81°F at the floor, a spread of about 145°F between a bather’s head and feet. With Saunum’s climate device running, the company reports the same room at about 196°F up high and 149°F near the floor, cutting the spread to about 47°F. Saunum says the system equalizes room temperature by more than 60 percent, drawing the scorching layer from under the ceiling, blending it with cooler, fresher air off the floor, and pushing softer steam back out evenly.

Those figures are Saunum’s own, not an independent lab’s, and they describe air, not people. But they are the kind of claim engineering can settle: temperature at a given height is measurable, repeatable, and hard to fake. The company backs the mechanism with patents, including a 2018 filing on its sauna climate device and salty-air method and a family of industrial design patents. Even heat is not only about comfort. It is why air-blended designs keep surfacing in accessible and senior-living sauna projects, where a bather who cannot climb to a hot top bench would otherwise sit in the cold zone near the floor. This is the proof Saunum has spent a decade building, and it holds up.

The claim the industry keeps making

The harder claims live one step out. Saunum, like most of the category, sells more than even heat. Its marketing leans on breathing comfort, longer sessions, deeper sweating, and recovery. When the company put an outdoor sauna in front of millions through a Logan Paul vlog this spring, the pitch was cardiovascular health and recovery, not airflow. Enterprise Estonia’s trade office reports that Saunum now sells in more than 50 countries, with North America one of its fastest-growing markets, where the company recently dropped the Air 10 in favor of the Air L. That growth, the trade office says, is fed by consumer interest in longevity, recovery, and “evidence-based wellness.”

There is a real research base for sauna and health. A widely cited 2015 study in JAMA Internal Medicine linked frequent Finnish sauna use to lower all-cause mortality. But that literature studies conventional sauna bathing. It does not test Saunum’s specific promise: that softer, more even, more oxygenated steam does something measurably better for the body than an ordinary hot room does. Even “easier to breathe,” the company’s most repeated phrase, is a physiological claim about perceived exertion, not an airflow reading. That is the ground independent physiology has not covered, and it is the exact ground buyers are starting to police. As we reported, 71 percent of consumers say they trust “clinically proven”, and the science under contrast therapy has turned out thinner than the marketing around it.

What the partnership has not said yet

For now, this is an intention, not a protocol. Neither Saunum nor the university has disclosed what the studies will measure, how many subjects will take part, when results are due, how the work is funded, or whether findings will be submitted for peer review. There is no public recording or transcript of Lippur’s remarks, only the university’s written recap and Saunum’s own post. Independent physiology is slow, and it can complicate a marketing story as easily as confirm it. The value of the announcement is in what it commits Saunum to, not in any result the company can claim today.

The endpoints will decide whether the work moves the claim. Perceived exertion and thermal comfort are the softer measures, useful but subjective. Harder ones would carry more weight: core and skin temperature read at the head and the feet, heart rate and heart-rate variability, sweat rate, and recovery markers taken after a session in an air-blended room against a matched conventional one. The version that could actually settle the question isolates a single variable, same room, same target temperature, one device switched on and one off, and asks whether softer steam is a comfort feature or a physiological one.

Saunum is not alone in turning to academia. Harvia, the industry’s largest manufacturer, recently tied its R&D pipeline to three schools in its home region of Central Finland, though that compact aims at engineering talent and manufacturing rather than health outcomes. Saunum’s is narrower and, in one way, braver. It points the research at the part of the pitch that is easiest to assert and hardest to prove.