Celsium Jonas Small/Classic Outdoor Sauna – Glass Front for 4 Persons
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Pure Balance – modern sauna aesthetics for your home
The Celsium Jonas Small Outdoor Sauna combines Scandinavian clarity with thoughtful functionality. Designed for up to four Persons, it creates a place of peace and harmony—ideal for those who don't want to compromise on design, comfort, and quality in a limited space. Its generous glass front opens up a view of nature and creates a bright, open atmosphere that brings body and mind into harmony.
Celsium Jonas Small Design Sauna – Architecture meets naturalness
With clean lines and a minimalist appearance, the Jonas Small stands for modern aesthetics and timeless elegance. Each sauna is unique—crafted with the utmost precision and attention to detail. The selection of color options, from soft beige to elegant teak to deep ebony, allows you to customize it to your home.
The patented design is protected by the EUIPO and stands for quality, stability, and durability.



Celsium Jonas Small Solid Wood Sauna – high-quality materials with character
The interior paneling is available in Scandinavian spruce, thermo pine, black alder, aspen, or premium thermo aspen—each wood type with its own expression of warmth and naturalness. The benches made of linden, black alder, or thermo pine complement the harmonious overall picture and are designed for maximum heat resistance and comfort.
The exterior walls are equipped with 5 cm PIR insulation—for optimal energy efficiency and a consistently pleasant climate.
Celsium Jonas Small Glass Sauna – Transparency, light, and space
The generous glass front creates an open, bright atmosphere and blurs the boundaries between indoors and outdoors. Choose between clear, tinted, or frosted glass—or opt for elegant mirror glass (full or half mirror) for additional privacy. The high-quality safety glass ensures stability and light transmission in equal measure.

Celsium Jonas Small Wellness Cabin – Technology, Comfort, and Individuality
The Jonas Small is fully insulated and designed for efficient heat utilization. Thanks to its modular construction, it can be assembled quickly and precisely. The door hinge can be flexibly placed on the left or right side.
The roof is equipped with rolled bitumen shingles as standard—a durable, weather-resistant solution that offers excellent protection and a clean, architectural look.
Each sauna comes with high-quality assembly instructions, so that it can be installed without the need for a specialist company.
Experience soothing warmth in a stylish ambience.
Design your Celsium Jonas Small Outdoor Sauna according to your ideas—from the type of wood to the glass variant. Create a place of retreat and relaxation that perfectly suits your lifestyle.
🔶 Scope of delivery
Everything at a glance – this is what's included!
- Prefabricated sauna elements including insulation
- Interior paneling made from selected wood species
- Benches (lime wood, standard version)
- Glass front (clear glass, standard)
- Door (choice of left or right hinge)
- Roofing material (roll bitumen shingles)
- Wooden floor with drainage channel
- Screw and assembly set
- Detailed assembly instructions

Customized sauna solutions for the highest standards
Are you planning something special and looking for a solution that fits your ideas perfectly?
Whether custom sizes, individual material requests, special color concepts, or technical adjustments—almost anything is possible.
Thanks to flexible manufacturing, even demanding special requests can be professionally realized—with the goal of creating a wellness experience that fits seamlessly into your living space.
Do you have a special idea?
- Feel free to contact us directly—we will advise you personally and work with you to develop your dream sauna.
Specifications
| Capacity | 2–4 Persons |
| External dimensions (W × D × H) | 2.20 m × 2.20 m × 2.55 m |
| Interior dimensions | 6.6 ft x 6.6 ft x 7.9 ft |
| Floor space | 4 m² |
| Weight | 700 kg |
| Door position | Left or right side available |
| Types of wood | Spruce, Thermo Pine, Shou Sugi Ban |
| Color options | Beige, Gray, Ebony, Teak, Hazel |
| Roof options | Roll bitumen shingles for roofs |
| Installation options | Kit or pre-assembled |
| Wall construction | Modular construction, 18 mm facade wood + 5 cm PIR insulation |
| Total wall thickness | approx. 14 cm |
| Interior paneling | Scandinavian spruce (standard) or thermo pine, black alder, aspen, thermo aspen |
| Benches | Linden (standard), optional black alder, thermo pine, thermo aspen |
| Glas | Clear glass (standard), optionally tinted, frosted, or mirrored glass |
| Floor | Wooden flooring, same wood type as interior walls |
| Construction | Patented (EUIPO), element-based structure Row |
| Insulation | Included in delivery |
Instructions: How to choose the right Sauna Heater for your Celsium Outdoor 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 get the most out of your Celsium Outdoor Sauna, here is a concise and informative guide to choosing the right heater.
1. Calculate the room volume correctly
First, determine the interior 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 exterior walls, or is freestanding in the garden, you should add approximately 1.5 m³ per square meter of uninsulated surface area. This so-called insulation reserve compensates for heat loss.
2. Choosing the right heating power
As a guideline:
1 kW heating capacity per 1 m³ room volume
- For 4 m³ → ideally a 4 kW heater
- For intermediate values, it is better to round up rather than down – so that your stove works reliably even at low outside temperatures.
3. Note the power connection
There are two variants depending on the model and performance:
- 230V connection (Schuko plug) for compact sauna heaters
- 400 V three-phase current (high-voltage current) for more powerful models
Note: The connection must always be carried out by a qualified electrician.
5. Controls & comfort functions
Modern control systems offer not only temperature control, but also timer functions, app control, and safety features:
- Manual: classic rotary control module
- Digital: external control unit with precise temperature control
- Smart: App control via Wi-Fi or 4G (e.g., HUUM UKU Wi-Fi)