Celsium Jonas Large garden sauna - comfortable and spacious
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Jonas Large - generous Outdoor sauna for sociable wellness moments
The Jonas Large is the spacious version of the popular Jonas series from Celsium. It combines modern Outdoor sauna design with first-class craftsmanship and offers space for up to six Persons. Ideal for families, groups of friends or sophisticated wellness areas where the focus is on relaxing together.
Product character: Jonas Large Outdoor sauna
The Jonas Large sauna stands for generosity and shared experience. Its open feeling of space invites you to share the warmth - whether with family, friends or for extended solo sessions. The flexible door and glass arrangement allows you to adapt the Jonas Large perfectly to your space and your preferences.


Jonas Large designer sauna - shape & materials
The patented design combines modern lines with high-quality natural materials. You can choose between three fine types of wood - classic spruce, striking shou sugi ban (burnt spruce) or durable thermo pine. The color scheme ranges from soft natural tones to striking lacquer finishes. Generous glass surfaces provide light and openness, while various roof options round off the look and offer protection from the weather.
Jonas Large wellness cabin - technology & options
For the heat source, you can choose from first-class wood and electric stove models (optional) from leading manufacturers such as Cozy, Harvia and HUUM - from rustic wood fires to modern, smart controllable electric heating. You can also choose between stainless steel, a black finish or a simple basic version for the chimney. Each component is designed for durability, efficiency and safety.
Application & comfort: Jonas Large relaxation sauna
With a width of 2.15 m and a length of 2.74 m, the Jonas Large offers plenty of space for lounging, sitting and relaxing. The ergonomic benches made of lime, optionally also available in black alder or thermo pine, ensure a high level of comfort in every position. Thanks to the flexible design options, the sauna adapts harmoniously to your home or garden.
Experience it now
With the Jonas Large, experience how a generous feeling of space, modern design and high-quality technology merge to create a special sauna experience - perfect for your home or sophisticated wellness facilities.
Scope of delivery
Everything at a glance - what's included!
- Jonas Large sauna in the selected wood and color variant
- Standard roof (black bitumen shingles)
- Complete assembly material
- Front glass door (standard version)
- Benches made of lime wood
- Assembly 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 |
| Dimensions (W × D × H) | 2.15 m × 2.74 m × 2.30 m |
| Floor space | 5,9 m² |
| Weight | approx. 820 kg |
| Exterior cladding | High-quality, weather-resistant wood |
| Lighting - optional | LED colored light optional |
| Interior benches | Ergonomically shaped, removable slats. Lime (standard), optional black alder or thermo pine |
| Recommended installation | Outdoor area, terrace, garden |
| Heating options | Harvia & HUUM - wood and electric stoves in various output levels |
Guide: How to choose the right Sauna heater for your Celsium garden sauna
The right Sauna heater is crucial for the overall sauna experience - it influences the heat quality, heating time and energy efficiency. To help you realize the full potential of your Celsium garden sauna, here is a compact and well-founded guide to choosing the right heater.
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 add approx. 1.5 m³ per square meter of uninsulated area. This so-called insulation reserve compensates for heat loss.
2. choose the right heat output
The following applies as a guideline
1 kW heating 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 (Schuko 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 controls 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
- Smart: App control via WLAN or 4G (e.g. HUUM UKU Wi-Fi)