m1 / sauna
The core cabin: panoramic glass, wood interior, Finnish sauna (about 80–110°C), for roughly four to six people.
- size
- 3300 x 2200 x 2500 mm
- heat
- 80-110 C Finnish sauna
- power
- 400V three-phase
sauna.website
A modular sauna system.
Designed in Copenhagen. Built in Germany. Seven modules that adapt to your site—from the core cabin to cold plunges and changing rooms.
01 / system
From the core sauna outward.
M1 is the core cabin. Modules 2 through 7 add water access, changing, shower, storage, and cold plunge, as the site and use require.
m2 / bridge
Direct water access for lake, coast, pool, or plunge-side sites. Powder-coated steel and timber deck.
- size
- 1500 x 2000 x 300 mm
- deck
- 100 mm natural wood planks
- site
- foundation, dock, or waterside placement
m3 / changing
A transitional room for robes, rhythm, and privacy. Skylit, compact, and designed as part of the ritual.
- size
- 1500 x 2000 x 2500 mm
- interior
- bench, hooks, locker shelving
- option
- M4 mounting position
m4 / thermal
Optional smart heating module. Uses computer processors to generate heat, offsetting electricity costs via bitcoin mining.
- input
- 3,500 W typical
- output
- 3,500 W heat + compute
- power
- 230V dedicated circuit
m5 / shower
Wall-mounted outdoor rinse, stainless - hose or fixed plumbing, per site.
- size
- 500 x 100 x 2000 mm
- metal
- stainless steel 316L
- supply
- hose or plumbed installation
m6 / storage
Outdoor storage for towels, robes, slippers, and equipment.
- size
- 600 x 300 x 1500 mm
- use
- robes, towels, slippers, operations
- seal
- weather-sealed, ventilated
m7 / plunge
Cold water module in the same family. Fill and drain are specified from site and operating plan.
- size
- 1500 x 2000 x 2500 mm
- water
- manual fill or plumbed supply
- drain
- waste or ground soak-away
02 / site context
Suitable for private, hospitality, and other site types.
Whether it's a private garden, a lakeside retreat, or a commercial hotel spa, we adapt the installation to your property.
private Home, garden, or private retreat
Designed around your personal ritual. We consider privacy, views, existing architecture, and how the modules integrate into your property.
professional Hotels, spas, and commercial developments
Engineered for continuous operation. We work directly with operators and architects to optimize guest flow, durability, maintenance, and capacity.
03 / site planning
How it works.
Every project starts with a site review. We assess your access, power, and foundation requirements before configuring your modules.
01 / use case
Tell us whether this is for a private home, a hospitality property, or a commercial development.
02 / placement
Choose between a freestanding outdoor unit, a waterside deck installation, or a bespoke indoor build.
03 / module plan
We finalize the exact module mix for your site, use case, and operating model.
04 / logistics
SAUNA. ships from Koerner Saunabau on a flatbed and is assembled on site by our team, or under our supervision with local contractors.
04 / specification
Uncompromising build quality.
Outdoor projects use fixed, weather-proof modules. Indoor projects use the exact same premium timber and glass, custom-fitted to your room.
Outdoor projects are configured from fixed modules. Indoor projects use the same bench geometry, material language, and operating logic inside existing architecture.
edition
2,100
numbered outdoor units, then production closes
full footprint
~22 m2
full outdoor configuration including all modules
core module
1,800 kg
M1 crane and delivery access assessed in review
planning
~8 weeks
typical from confirmed order to installation
- design
- Groundwork Studio, Copenhagen.
- manufacture
- Koerner Saunabau, Albstadt. Third generation, founded 1949.
- outdoor
- Numbered 0001-2100. Configured to site, climate, and use from seven modules with one design and material standard.
- indoor
- Bespoke and uncapped. Same bench geometry, timber detailing, and material language as the outdoor unit, modelled to the architecture.
- materials
- Natural wood strips, wood planks, black painted strips, frameless load-supporting glass, powder-coated steel, slate roof, and stainless steel 316L.
- electrical
- 400V three-phase for the sauna heater. 230V dedicated circuit for M4 where configured. Certified local installation required.
- foundation
- Level concrete pad, screw piles, or timber frame prepared before delivery. Vehicle and crane access assessed per site.
- water
- Optional. Hose connection for basic shower or plunge use; plumbed supply and drainage for installed water systems.
- thermal
- M4 compute-as-heat can be assessed where electricity price, duty cycle, and thermal demand make the economics and integration sensible.
- lead time
- Typically around eight weeks from confirmed order to installation after specification and site preparation are aligned.
05 / thermal logic
Smart heating.
Our optional M4 module uses computer processors to generate heat—effectively mining bitcoin to offset your electricity costs while warming the sauna.
Computers generate heat. Instead of wasting it, the M4 module captures this heat for your sauna or changing room.
It draws the same power as a standard electric heater, but produces a secondary output: compute power.
| how it works | runs compute operations (bitcoin mining) while heating |
| input | standard electricity (same wattage as a normal heater) |
| output 1 | heat for the sauna cabin or changing room |
| output 2 | digital asset accumulation to offset power costs |
| best for | sites with high daily usage and high electricity costs |
06 / process
From planning to installation.
A straightforward process from your first inquiry to the final build.
01 Site Review
We assess your location, climate, utilities, and how you plan to use the sauna.
02 Configuration
We select the right modules for your space, balancing heat, cooling, and storage.
03 Manufacture & Install
Built in Germany by Koerner Saunabau, delivered to your site, and installed in roughly 8 weeks.
07 / contact
Start your project.
08 / bitcoiners
Bitcoiners.
To bitcoiners, builders, and communities: Collaborate and build with us. Let's meet and share ideas, because a Bitcoin-native talk track unlocks distinct use cases and collaborations.