Celsium Jonas Classic 4 Person Outdoor Sauna
Premium Scandinavian Design Meets Nordic Wellness Tradition
Experience the Jonas Classic—a hand-crafted outdoor sauna that transforms your garden into a luxurious 4-person wellness retreat with panoramic glass and exceptional craftsmanship.
Why Choose the Jonas Classic
Four compelling reasons this is more than just a sauna
Panoramic Glass Design
Floor-to-ceiling glass facade invites light and offers uninterrupted views, transforming every sauna session into an immersive experience within your garden.
Hand-Crafted in Lithuania
Meticulously crafted by seasoned artisans using premium Nordic timber and precision engineering for exceptional longevity and beauty.
Compact Yet Spacious
2.17 m × 2.17 m footprint fits beautifully in modern gardens whilst comfortably accommodating four adults with ample relaxation space.
Extensive Customisation
Tailor wood types, interior materials, glass finishes, heating systems, and lighting to create a sauna that's uniquely yours.
Exclusive Scandinavian Craftsmanship and Superior Materials
The Jonas Classic is hand-crafted by seasoned Lithuanian artisans who understand timber, heat, and durability. Every component has been selected for longevity and beauty.
Premium Nordic timber options allow you to choose between Scandinavian Spruce (natural elegance), Shou Sugi Ban (charred Japanese technique for weather resistance), or Thermo Pine (heat-treated for maximum stability). Precision-machined construction ensures tight joinery and superior insulation, whilst multi-layered timber design maximises heat retention.
This isn't just a sauna—it's an architectural statement piece that transforms your outdoor space into a private wellness retreat.
The Panoramic Glass Experience: Where Design Meets Nature
The floor-to-ceiling glass facade is the heart of the Jonas Classic's design. It's not just beautiful—it fundamentally changes how you experience wellness. Panoramic views transform your session from a purely thermal experience into a sensory immersion.
Natural light bathes the interior, creating a serene, open atmosphere. Whether you're watching your garden through autumn leaves or snow-draped winter branches, every session becomes a moment of connection with nature.
Customise your glass to match your privacy needs: Clear glass for unobstructed views, tinted options (Bronze, Grey) for subtle privacy, Planibel Black for dramatic aesthetics, or Mirror glass for luxury light-reflecting appeal.
Premium Heating Systems for Authentic Sauna Performance
At the core of the Jonas Classic lies your choice of heating system, each engineered for optimal performance in this compact, beautifully insulated space.
Electric heating is reliable and low-maintenance—choose from trusted brands (Harvia, Huum) with manual, local, or WiFi-enabled controls for complete convenience. Wood-fired heating offers the authentic, traditional sauna ritual: the scent of wood, the glow of fire, and the deep satisfaction of a true smoke sauna experience.
Both options deliver efficient, even heat distribution across the interior, promoting circulation, detoxification, muscle recovery, and stress relief. The thermally-treated timber walls enhance heat retention whilst maintaining structural integrity year-round.
Thoughtful Details Throughout
Every feature designed to enhance your sauna experience
Five Glass Colour Options
Clear for maximum light, Bronze and Grey for subtle tinting, Planibel Black for drama, or Mirror glass for luxury. Find the perfect finish for your garden aesthetic.
Customisable Interior Materials
Choose from Aspen, Black Alder, Thermo Pine, and Thermo Aspen to create the exact ambiance and comfort level you desire for your wellness space.
Ambient LED Lighting
Standard dimmable LEDs beneath the bench create a warm glow. Upgrade with additional strips behind the backrest or side walls for spa-like ambiance.
What's Included in Your Jonas Classic
- Hand-Crafted Sauna Structure
- Premium Nordic Timber Walls
- Panoramic Glass Front Facade
- Dimmable LED Lighting (under bench)
- Customisable Interior Materials
- Free Delivery to Mainland UK
- 5-Year Parts-Only Warranty
- Flat-Pack or Fully Assembled Options
- Detailed Electrical Installation Guidance
- Customisation Configuration Support
- Professional Installation Advice
- Comprehensive User Manual & Maintenance Guide
Key Features
- Panoramic glass facade – Floor-to-ceiling transparency for immersive experience and natural light.
- Compact footprint – 2.17 m × 2.17 m, perfect for modern gardens and small spaces.
- Premium Nordic timber – Hand-selected for durability, aesthetics, and thermal performance.
- Extensive customisation – Wood types, colours, glass finishes, bench materials, heating systems, and lighting all tailored to your preferences.
- Electric or wood-fired heating – Choose from trusted European heating brands.
- Customisable ambient lighting – Dimmable LEDs for mood and wellness enhancement.
- Professional installation support – Detailed guidance and optional fully assembled delivery.
Technical Specifications
| External Dimensions | 2.17 m W × 2.17 m D × 2.55 m H |
| Footprint | 4.7 m² (ideal for compact gardens) |
| Capacity | 4 people comfortably |
| External Wall Options | Scandinavian Spruce, Shou Sugi Ban, Thermo Pine |
| Internal Wall Options | Scandinavian Spruce, Black Alder, Thermo Pine, Aspen, Thermo Aspen |
| Bench Materials | Linden, Aspen, Black Alder, Thermo Pine, Thermo Aspen |
| Exterior Colour | Signal Black, Blonde Wood, Ivory White, Platinum Grey, Chocolate Brown |
| Glass Front Options | Clear, Bronze, Grey, Planibel Black, Mirror |
| Lighting | Dimmable LEDs under bench (included); Extra LEDs for backrest/side (+ £250) |
| Door Placement | Left or Right (no additional cost) |
| Heating – Electric | Harvia Trendi 9kW, Huum Drop 9kW, Harvia Spirit 9kW WiFi |
| Heating – Wood-Fired | Harvia M3 16.5kW, Harvia Pro 20 24kW, Harvia Legend 150 16kW |
| Delivery Options | Flat-pack (standard) or Fully Assembled (+ £2,500) |
| Warranty | 5 years parts-only (residential use) |
| Base Price | £8,999 (excludes heater & chimney) |
| Delivery | Free to mainland UK |
| Craftsmanship | Hand-crafted in Lithuania |
Tailor Your Sauna to Perfection
Every garden is unique. Every preference is different. Configure your Jonas Classic to create a sauna that's truly yours.
External Wall Materials
Choose from premium wood finishes that combine aesthetics with weather resistance and durability for your UK garden climate.
Internal Wall & Bench Materials
Select interior finishes that create the exact ambiance and comfort level for your wellness experience.
Exterior Colour Selection
Five sophisticated colours to match your garden aesthetic and home design. No additional cost—choose what speaks to you.
Glass Front Finish
Choose your glass to balance privacy, light, and visual impact. Each option transforms the sauna's aesthetic and experience.
Heating Systems
Choose between electric convenience and wood-fired authenticity. Both deliver authentic sauna performance engineered for this space.
Delivery & Installation
Flat-pack for DIY or professional assembly, or fully assembled delivery. Contact us for professional installation quotes from our expert team.
⏱️ Lead Time: Each Jonas Classic is hand-crafted to order with an approximate 6-8 week production time, ensuring exceptional quality and attention to detail in every sauna.
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Description
Premium Scandinavian Design Meets Nordic Wellness Tradition
Experience the Jonas Classic—a hand-crafted outdoor sauna that transforms your garden into a luxurious 4-person wellness retreat with panoramic glass and exceptional craftsmanship.
Why Choose the Jonas Classic
Four compelling reasons this is more than just a sauna
Panoramic Glass Design
Floor-to-ceiling glass facade invites light and offers uninterrupted views, transforming every sauna session into an immersive experience within your garden.
Hand-Crafted in Lithuania
Meticulously crafted by seasoned artisans using premium Nordic timber and precision engineering for exceptional longevity and beauty.
Compact Yet Spacious
2.17 m × 2.17 m footprint fits beautifully in modern gardens whilst comfortably accommodating four adults with ample relaxation space.
Extensive Customisation
Tailor wood types, interior materials, glass finishes, heating systems, and lighting to create a sauna that's uniquely yours.
Exclusive Scandinavian Craftsmanship and Superior Materials
The Jonas Classic is hand-crafted by seasoned Lithuanian artisans who understand timber, heat, and durability. Every component has been selected for longevity and beauty.
Premium Nordic timber options allow you to choose between Scandinavian Spruce (natural elegance), Shou Sugi Ban (charred Japanese technique for weather resistance), or Thermo Pine (heat-treated for maximum stability). Precision-machined construction ensures tight joinery and superior insulation, whilst multi-layered timber design maximises heat retention.
This isn't just a sauna—it's an architectural statement piece that transforms your outdoor space into a private wellness retreat.
The Panoramic Glass Experience: Where Design Meets Nature
The floor-to-ceiling glass facade is the heart of the Jonas Classic's design. It's not just beautiful—it fundamentally changes how you experience wellness. Panoramic views transform your session from a purely thermal experience into a sensory immersion.
Natural light bathes the interior, creating a serene, open atmosphere. Whether you're watching your garden through autumn leaves or snow-draped winter branches, every session becomes a moment of connection with nature.
Customise your glass to match your privacy needs: Clear glass for unobstructed views, tinted options (Bronze, Grey) for subtle privacy, Planibel Black for dramatic aesthetics, or Mirror glass for luxury light-reflecting appeal.
Premium Heating Systems for Authentic Sauna Performance
At the core of the Jonas Classic lies your choice of heating system, each engineered for optimal performance in this compact, beautifully insulated space.
Electric heating is reliable and low-maintenance—choose from trusted brands (Harvia, Huum) with manual, local, or WiFi-enabled controls for complete convenience. Wood-fired heating offers the authentic, traditional sauna ritual: the scent of wood, the glow of fire, and the deep satisfaction of a true smoke sauna experience.
Both options deliver efficient, even heat distribution across the interior, promoting circulation, detoxification, muscle recovery, and stress relief. The thermally-treated timber walls enhance heat retention whilst maintaining structural integrity year-round.
Thoughtful Details Throughout
Every feature designed to enhance your sauna experience
Five Glass Colour Options
Clear for maximum light, Bronze and Grey for subtle tinting, Planibel Black for drama, or Mirror glass for luxury. Find the perfect finish for your garden aesthetic.
Customisable Interior Materials
Choose from Aspen, Black Alder, Thermo Pine, and Thermo Aspen to create the exact ambiance and comfort level you desire for your wellness space.
Ambient LED Lighting
Standard dimmable LEDs beneath the bench create a warm glow. Upgrade with additional strips behind the backrest or side walls for spa-like ambiance.
What's Included in Your Jonas Classic
- Hand-Crafted Sauna Structure
- Premium Nordic Timber Walls
- Panoramic Glass Front Facade
- Dimmable LED Lighting (under bench)
- Customisable Interior Materials
- Free Delivery to Mainland UK
- 5-Year Parts-Only Warranty
- Flat-Pack or Fully Assembled Options
- Detailed Electrical Installation Guidance
- Customisation Configuration Support
- Professional Installation Advice
- Comprehensive User Manual & Maintenance Guide
Key Features
- Panoramic glass facade – Floor-to-ceiling transparency for immersive experience and natural light.
- Compact footprint – 2.17 m × 2.17 m, perfect for modern gardens and small spaces.
- Premium Nordic timber – Hand-selected for durability, aesthetics, and thermal performance.
- Extensive customisation – Wood types, colours, glass finishes, bench materials, heating systems, and lighting all tailored to your preferences.
- Electric or wood-fired heating – Choose from trusted European heating brands.
- Customisable ambient lighting – Dimmable LEDs for mood and wellness enhancement.
- Professional installation support – Detailed guidance and optional fully assembled delivery.
Technical Specifications
| External Dimensions | 2.17 m W × 2.17 m D × 2.55 m H |
| Footprint | 4.7 m² (ideal for compact gardens) |
| Capacity | 4 people comfortably |
| External Wall Options | Scandinavian Spruce, Shou Sugi Ban, Thermo Pine |
| Internal Wall Options | Scandinavian Spruce, Black Alder, Thermo Pine, Aspen, Thermo Aspen |
| Bench Materials | Linden, Aspen, Black Alder, Thermo Pine, Thermo Aspen |
| Exterior Colour | Signal Black, Blonde Wood, Ivory White, Platinum Grey, Chocolate Brown |
| Glass Front Options | Clear, Bronze, Grey, Planibel Black, Mirror |
| Lighting | Dimmable LEDs under bench (included); Extra LEDs for backrest/side (+ £250) |
| Door Placement | Left or Right (no additional cost) |
| Heating – Electric | Harvia Trendi 9kW, Huum Drop 9kW, Harvia Spirit 9kW WiFi |
| Heating – Wood-Fired | Harvia M3 16.5kW, Harvia Pro 20 24kW, Harvia Legend 150 16kW |
| Delivery Options | Flat-pack (standard) or Fully Assembled (+ £2,500) |
| Warranty | 5 years parts-only (residential use) |
| Base Price | £8,999 (excludes heater & chimney) |
| Delivery | Free to mainland UK |
| Craftsmanship | Hand-crafted in Lithuania |
Tailor Your Sauna to Perfection
Every garden is unique. Every preference is different. Configure your Jonas Classic to create a sauna that's truly yours.
External Wall Materials
Choose from premium wood finishes that combine aesthetics with weather resistance and durability for your UK garden climate.
Internal Wall & Bench Materials
Select interior finishes that create the exact ambiance and comfort level for your wellness experience.
Exterior Colour Selection
Five sophisticated colours to match your garden aesthetic and home design. No additional cost—choose what speaks to you.
Glass Front Finish
Choose your glass to balance privacy, light, and visual impact. Each option transforms the sauna's aesthetic and experience.
Heating Systems
Choose between electric convenience and wood-fired authenticity. Both deliver authentic sauna performance engineered for this space.
Delivery & Installation
Flat-pack for DIY or professional assembly, or fully assembled delivery. Contact us for professional installation quotes from our expert team.
⏱️ Lead Time: Each Jonas Classic is hand-crafted to order with an approximate 6-8 week production time, ensuring exceptional quality and attention to detail in every sauna.
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