The Business of Aufguss

Aufguss is reaching the US on its numbers. Bathhouse is pacing toward a $120 million run rate in New York. Othership raised about $8.5 million in 2025 to take its performance-sauna model further into the US. Paris’s new Sant Roch cleared 85% occupancy in its opening month on a disciplined version of the same formula. The ritual that began in German-speaking Central Europe is now a commercial product, and US resorts and hospitality groups are asking whether it pencils.

The clearest public price point in the category comes from Galgorm Resort in Northern Ireland, which hosts the 2026 UK Aufguss Championships this week. Its Celtic Sauna Infusion runs three times a day, lasts 25 minutes, and is priced from £20 per person, including as an add-on to a stay. Galgorm does not publish ritual revenue or seat counts, so the math below uses an illustrative 30-seat room earning £10,000 (about $12,700) a month. Revenue is one line of a P&L that has four other lines US operators need to model honestly before they commit.

The revenue line is thinner than it looks

Galgorm runs three guided sessions a day. In a 30-seat room, that is 2,700 seat-slots a month. At £20 a seat, a theoretical sell-out month would clear £54,000. A £10,000 month means about 500 seats sold, or about 18.5% of maximum seat-hours.

That number would not be a failure. It is what a resort spa can look like when ritual demand concentrates on weekend and overnight guests and thins out on a Tuesday afternoon. Urban bathhouses invert the shape. Sant Roch appears to cap bookings at roughly half of what its sauna could physically hold and then runs that bookable inventory at 85% occupancy. Bathhouse is on a membership-plus-drop-in model that drives repeat visits through the week. Both are built for different demand curves than a resort that sells a spa day to its Saturday couples and a quieter ritual to its weekday conference bookings.

A US operator pro-forma’ing an Aufguss room to a £54,000 number will be wrong. Building it to a £10,000 number, with upside to £15,000–£25,000 depending on mix, is the honest exercise.

The labor line is where the model wins

Aufguss works as a product because of the labor ratio. A standard hotel massage room is one-to-one: one licensed therapist, one guest, one hour, a 50% therapist commission on the revenue. A 30-seat Aufguss room run by a single Sauna Master is one-to-thirty on the same 60-to-75-minute footprint. The venue that hosted the 2025 UK Championships at ARC in London’s Canary Wharf seats 65. Some European performance saunas seat 90.

That ratio is the investment case: 50-to-90-seat performance saunas replace treatment rooms. The same ratio is what lets a resort room earn its keep at 18.5% utilization: a single Sauna Master’s shift can carry hundreds of guests a week.

It has a cost. A certified Aufgussmeister is not a spa attendant. Training is long (European academies like Aufguss Roots, Flow Aufguss, and Loylymasters run multi-week certification programs covering thermodynamics, essential oil chemistry, cardiovascular response in extreme heat, and the choreography itself), and the talent pool is thin outside Central Europe. US operators should expect to pay at a premium to a standard spa attendant hourly rate, and they should expect to spend on bringing in European trainers before a domestic program is credible. Bathhouse, Othership, and a handful of US resort programs are already competing for the same small cohort of certified practitioners. That supply of practitioners limits how fast the category scales. One workaround is already running in Ireland, where freelance aufguss masters travel sauna to sauna rather than staffing a single venue, spreading a trained practitioner’s cost across several sites.

The energy and liability lines are the US gotchas

Commercial performance saunas draw meaningfully more power than a residential room. A 30-seat space typically runs a 20-to-30-kilowatt heater versus roughly 9 kilowatts for a backyard unit. Three peak sessions a day plus ramp-up and standby add real kilowatt-hours to the P&L, and the room itself has to be built to a commercial ventilation spec to handle the humidity swing when water and ice hit 392°F stones. None of this is prohibitive, but it is a meaningfully different capital build than a relaxation sauna.

The larger unknown for US operators is liability. A standard hotel spa waiver does not contemplate 30 adults in a 176°F room while a staff member throws essential-oil-and-ice balls onto 392°F stones and swings a towel at 194°F ceiling air. Undiluted essential oils are flammable; respiratory events from over-dosed menthol or eucalyptus are a documented risk; heat exhaustion at 15-minute exposure to peak ceiling temperatures is real. European certification programs teach oil dilution, plus medical-response protocols for guests who bail out early.

Bathhouse and Othership have not publicly shared their US insurance framework, but both run dedicated staff training, explicit informed-consent processes, and medical response protocols that go beyond a standard spa release. US operators installing their first Aufguss room should budget legal and underwriting work as a line item. It is the piece European reference cases cannot fully answer.

The revenue per square foot comparison is not as clean as it looks

If a spa director is reading this on an A/B basis against a traditional treatment room, the math cuts both ways.

A 30-seat Aufguss room with its cool-down area and queue is roughly 500 to 700 square feet. A £10,000 month on that footprint is about £15 to £20 per square foot per month of gross revenue, or roughly $19 to $25. A 100-to-120-square-foot massage room, booking at $130 a session with six daily bookings at 70% utilization, clears about $16,000 a month on a tenth of the footprint: around $130 to $160 per square foot per month gross. On pure revenue per square foot, the massage room wins.

But massage pays roughly half the revenue back out as therapist commission. Aufguss pays one Sauna Master a shift to cover every seat in the room. Net of variable labor, the comparison looks very different, and the real question is which constraint an operator is trying to relax. If the bottleneck is licensed therapist hours, Aufguss buys capacity you cannot otherwise hire. If the bottleneck is floor plan, a performance sauna is a harder call.

Sauna Masters now have a career path

Zak Moore, Galgorm’s 20-year-old reigning UK Aufguss Champion, did not come up as a performer. He started as a spa attendant at Galgorm, was sent to Farris Bad in Norway to apprentice under Lasse Eriksen (president of the Aufguss World Masters), and came back to win the 2025 UK finals in front of an international jury at ARC in Canary Wharf with a routine built around a Dublin pub owner, a leprechaun, and Irish music the room sang along to through peak heat around 176°F.

A career path for commercial Sauna Masters now exists, and the 2026 Aufguss World Masters calendar shows it.

The circuit has also split. “Show Aufguss” keeps the costumes, lighting, narratives, and music. “Modern Classic” strips those out and judges strictly on towel technique, heat distribution, and essential oil pacing. The split is also a product decision for any operator installing a program (Harvia sponsored the 2025 Verona Worlds using an EOS heater, a deliberate positioning play for the German premium commercial market). A resort selling theatrical recovery experiences should run Show. A program pitched to returning members on a nervous-system-regulation story should probably run Classic. Most US operators will end up running both, on different nights.

What operators should watch through 2026

The Aufguss USA Nationals at Bathhouse in May will be the first clean test of US practitioner depth. If the field is strong, the supply-side constraint is loosening faster than the skeptics expected. If it is thin, that confirms the training pipeline is still the bottleneck.

On the operator side, track through the back half of 2026 which US resort groups announce in-house Aufguss programs; which heater distributors (Finnleo, Amerec, Almost Heaven, SaunaLife) start marketing performance-sauna configurations with tiered seating and commercial ventilation rather than residential builds; and whether a US underwriter publishes commercial insurance guidance tailored to communal performance rituals. The first insurance carrier that does will probably write a large share of the market.

Copenhagen’s facilitated-session model

Plugin Heat Club reports more than 12,000 monthly participants across two Copenhagen locations. Its 75-minute format pairs three guided sauna rounds with cooling and rest, with cold immersion optional. The operator trains facilitators through its own seven-module course and practical assessment. These are company-reported figures and an operator-specific credential.

The session also requires staffing beyond the performance itself. In our report on sauna-master work, Chris Shenkle describes reading guests and adjusting heat in real time, while Anders Hage raises the physical and mental demands of sustained heat exposure. A commercial schedule needs to account for recovery and the cleaning, preparation and guest care around each ritual.

October 2026 results: Jiří Žákovský won the Modern Classic Cup at Farris Bad. The host hotel also received a regional hotel-spa award at the 2026 World Spa & Wellness Awards, where Banya No.1 Hoxton won the independent-spa category.