Celsium Jonas Small garden sauna - glass front for 4 Persons
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Timeless tranquillity in a compact form
The Jonas Small sauna from Celsium combines understated elegance with a maximum sense of space - despite its space-saving dimensions. With its generous glass front, clear lines and careful choice of materials, it offers you a stylish retreat that fits perfectly into modern living concepts.
An expression of stylish restraint: the Jonas Small designer sauna
This exclusive sauna stands for a minimalist aesthetic that showcases space and light. At just 4 m², the Jonas Small creates a surprisingly open ambience - ideal for urban terraces, gardens or compact spa areas. Its modular architecture with freely selectable door position adapts effortlessly to your room concept.


High-quality materials: the Jonas Small solid wood sauna
Whether classic, dark accents or Scandinavian lightness - thanks to individual color and wood variants, you can design your sauna to suit your taste. Choose from Spruce, Thermo Pine or Shou Sugi Ban - a charred wood finish with architectural depth. All surfaces are treated to be weather-resistant and emphasize the natural grain.
Sophisticated technology: The Jonas Small wellness cabin with optional stove system
With a selection of high-quality wood or electric stove options from Cozy, Harvia and HUUM, the heat source can be optimally tailored to your preferences - including a modern WiFi control system on request. The chimney is also freely selectable - made of stainless steel or in elegant black. The result is a technically and visually perfectly coordinated solution.
Comfort in every nuance: the Jonas Small glass sauna for four Persons
Despite its compact dimensions, the Jonas Small can comfortably accommodate up to four Persons. You decide how open or protected you want your sauna experience to feel - with options for a glass front, rear wall glazing or all-round light. Whether for quiet moments alone or relaxing evenings for two - this sauna adapts to you. It can be delivered fully assembled or as a kit on request.
Configure individually
Put together your Jonas Small according to your ideas - from the type of wood and color finish to the heating system. We are also happy to realize special requests and custom-made products on request. Make your sauna as unique as your home.
Experience it now
Bring wellness into your home - with the Jonas Small from Celsium. Enjoy space-saving luxury, high-quality materials and the unmistakable sauna experience in your own garden.
Scope of delivery
Everything at a glance - what's included!
- Jonas Small sauna cabin (either pre-assembled or as a kit)
- Choice of wood cladding (Spruce, Thermo Pine or Shou Sugi Ban)
- Choice of color finish (Beige, Grey, Ebony, Teak, Hazel)
- Glass front with door (choice of left or right position)
- Choice of roof covering (bitumen or tarpaulin)
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 | 2-4 Persons |
| Dimensions (W × D × H) | 200× 200 × 230 cm |
| Floor space | 4 m² |
| weight | 700 kg |
| Door position | Left or right selectable |
| Wood types | Spruce, Thermo Pine, Shou Sugi Ban |
| Color variants | Beige, Gray, Ebony, Teak, Hazel |
| Roof options | Bitumen (black), Tarpaulin |
| Assembly options | Kit or pre-assembled |
Guide: How to choose the right Sauna heater for your Celsium garden sauna
The right Sauna heater is crucial to the overall sauna experience - it affects 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
There are two variants depending on the model and output:
- 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 control units 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)