Celsium Jonas mini garden sauna - compact
incl. VAT
🚚 Free shipping to the EU mainland & Switzerland for orders over €300
The perfect sauna for urban retreats
The Jonas Mini is the smallest sauna in Celsium's renowned Jonas series – designed for stylish relaxation in small spaces. Whether on the balcony, terrace, or in a small garden, this elegant sauna combines thoughtful design with high-quality construction to create an exclusive feel-good atmosphere for one to two Persons. Thanks to its patented design (EUIPO) and clear design language, the Jonas Mini blends harmoniously into any environment – minimalist, elegant, and functional.
Jonas Mini Outdoor Sauna – compact elegance with character
The Jonas Mini stands for uncompromising quality in a small space. With its element-based construction (not block planks!), it impresses with its high stability and excellent insulation: 5 cm PIR ensures premium-level heat storage. The flexible placement of the door (left, right, or center) allows the sauna to be perfectly adapted to your spatial conditions.



Jonas Mini Design Sauna – fine woods for a stylish interior
There are five different types of wood to choose from for the interior walls: Scandinavian spruce is used as standard – light, fine-grained, and Nordic clear. For a warmer ambience, you can optionally upgrade to Thermo Pine, Black Alder, Aspen, or Thermo Aspen (premium). You also have maximum freedom when it comes to the benches: Linden wood is standard, but black alder, thermo pine, or elegant thermo aspen are also available, depending on the desired feel and aesthetics.
Jonas Mini Glass Sauna – custom-made views flooded with light
Equipped with a clear glass door as standard, you can customize the glass surfaces: from tinted or frosted front glass to full-surface mirror or Planibel glass elements – at the front, rear, or on both sides. These variants open up the space visually, create privacy, or enhance the natural play of light. Particularly stylish: tinted bronze glass for a luxurious touch.

Jonas Mini Wellness Cabin – comfortable, robust, and weatherproof
The Jonas Mini offers a well-thought-out interior concept with L-shaped benches (standard since 2025) and is ideal for relaxing moments alone or intimate time out for two. The solid wood floor is made of the same type of wood as the interior paneling – untreated for natural water drainage via floor joints and drainage channels. The bitumen roof with shingles provides reliable protection from the weather – and can be installed without the need for a specialist.
Experience soothing warmth in your garden
Experience stylish sauna moments in the smallest of spaces – individually configurable, high-quality workmanship, and uncompromising insulation.
🔶 Scope of delivery
Everything at a glance – this is what's included!
- Sauna body in your choice of wood type and color
- Roof in selected design
- Glass elements according to selection
- Benches made of lime wood (standard)
- Selected Sauna Heater
- Suitable chimney (for wood-burning stoves)
- Assembly materials
- 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 Persons |
| External dimensions (W x D x H) | 1.85 × 1.22 × 2.55 m |
| Interior dimensions | 1.65 × 1.02 × 2.40 m (after deduction of wall + bench) |
| Exterior materials | Spruce, Thermotre (thermally modified spruce), Shou Sugi Ban spruce |
| Glass front | 8 mm tempered safety glass |
| Delivery condition | Fully assembled or optionally flat-packed |
| Basic requirements | Level, stable foundation required, own transport & unloading necessary (optional crane service) |
| Weight | Approx. 620 kg |
| External wall construction | 18 mm facade boards |
| Insulation | 5 cm PIR (high quality) |
| Total wall thickness | approx. 14 cm |
| Interior paneling (standard) | Scandinavian spruce |
| Interior trim (optional) | Thermo Pine, Black Alder, Aspen, Thermo Aspen (Premium) |
| Benches (standard) | Linden wood |
| Benches (optional) | Black Alder, Thermo Pine, Thermo Aspen |
| Door side | Can be mounted on the left, right, or center |
| Roof | Rolled bitumen shingles (black, incl.) |
| Glass options | Clear, tinted (bronze), matte, mirror glass, Planibel |
| Structure | Ideally from the inside (concealed), alternatively possible from the outside |
| Sauna Heater recommendation (electric) | 9 kW or 10.8 kW |
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)