Celsium Herkus Large garden sauna - Scandinavian design
incl. VAT
🚚 Free shipping to the EU mainland & Switzerland for orders over €300
The elegant oasis for communal wellness
Create a stylish sauna experience for up to six people with the Herkus Large. Persons - ideal for relaxing times with family and friends. The sophisticated, rounded triangular design with integrated vestibule combines Scandinavian clarity with modern aesthetics.
Harmony in form & space
The Herkus Large takes up the gentle barrel profile of the Herkus Small, but adds an external vestibule - creating a generous feeling of space with a special elegance. Its minimalist design is clear and timeless.



Material strength & plank precision
Made with solid 44 mm thick planks (as recommended by the manufacturer for premium quality), the Herkus Large combines first-class thermal insulation with impressive stability and long-lasting naturalness - ideal for a harmonious sauna climate.
Technology & heating comfort with style
Whether wood-burning stove or electric heater - the Herkus Large offers comprehensive heating options that meet both visual and functional requirements. Its well thought-out layout ensures even heat distribution and efficient use of energy.

Cozy warmth with a high quality of life
The sauna comfortably accommodates six Persons. The outdoor vestibule adds to the living comfort - ideal for communal cool-down breaks, preparation or simply as a stylish intermediate element.
Discover now
Enjoy the perfect blend of compact design and generous interior space - with the Celsium Herkus Large, your home becomes a stylish wellness oasis for you and your guests.
🔶 Scope of delivery
Everything at a glance - what's included!
- Herkus Large sauna in modular barrel elements
- Wall, ceiling and floor parts made of 44 mm thick planks
- Outdoor vestibule including entrance area
- Choice of wood types and external color scheme
- Door with safety glass, front / rear glass as required
- Assembly material and instructions

Individual sauna solutions for the highest demands
Are you planning something special and looking for a solution that exactly matches your ideas?
Whether custom-made sizes, individual material requests, special color concepts or technical adaptations - almost anything is possible.
Thanks to flexible production, even demanding special requests can be professionally realized - with the aim of creating a wellness experience that fits seamlessly into your living space.
Do you have a special idea?
- Contact us directly - we will advise you personally and develop your dream sauna together.
Specifications
| Sauna capacity | 6 Persons |
| Blank thickness | 44 mm |
| Dimensions (WxHxD) | 2.412 m x 2.438 m x 2.840 m |
| Floor space | approx. 5.68 m² |
| Weight | approx. 570 kg |
| Material selection | Spruce, Shou Sugi Ban or Thermo Pine |
| Heating | Electric or wood stove (Harvia, Cozy, HUUM) - Optional |
| Heat insulation | Solid wood 44 mm - excellent heat storage |
| Installation | Pre-assembled modules or flat-packed for self-assembly |
| Additional area | Integrated vestibule - with covered terrace |
| Glass elements | Safety glass door, optional front/rear glazing |
Instructions: How to find the right Sauna heater for your Celsium garden sauna
The right one Sauna heater heater is crucial for the overall sauna experience - it influences the heat quality, heating time and energy efficiency. So that you can exploit the full potential of your Celsium garden sauna, you will find a compact and well-founded guide to choosing the right heater here.
1. calculate the room volume correctly
First determine the internal volume of your sauna:
Width × depth × height = m³ (cubic meters)
Example for the Ula Micro: 1.35 m × 1.25 m × 2.30 m = approx. 3,9 m³
Important:
If your sauna has glass elements, thin outer walls or a free-standing location in the garden, you should also add approx. 1.5 m³ per square meter of uninsulated area should be added. This so-called insulation reserve compensates for heat loss.
2. choose the right heat output
The following applies as a guideline:
1 kW heat output per 1 m³ room volume
- For 4 m³ → ideally a stove with 4 kW
- For intermediate values, round up rather than down - so that your stove works reliably even at low outside temperatures
3. note the power connection
Depending on the model and output, there are two variants:
- 230 V connection (earthed plug) for compact sauna heaters
- 400 V three-phase current (heavy current) for more powerful models
Note: The connection must always be carried out by a qualified electrician.
5. control & comfort functions
Modern control systems not only offer temperature control, but also timer functions, app control and safety:
- Manual: classic rotary control module
- Digital: external control unit with precise temperature control
- SmartApp control via WLAN or 4G (e.g. HUUM UKU Wi-Fi)
