Jonas Grand – The Ultimate Large-Scale Modern Garden Sauna
Command your garden landscape with the Jonas Grand—the largest and most prestigious outdoor sauna in the Jonas collection. Designed for those who view wellness as a shared experience, the Jonas Grand combines expansive panoramic views with the raw power required to create a world-class 6-person thermal sanctuary.
In 2026, the benchmark for luxury is "Unrestricted Space." The Jonas Grand (FX1704XC) moves beyond the traditional cabin, offering an 820kg architectural masterpiece that anchors your outdoor living space. With a footprint of over 6m² and a high-volume interior, it is specifically engineered for larger families, social gatherings, or athletes who require the luxury of reclining fully during a high-intensity 110°C session.
The Jonas Grand Advantage: Grandeur by Design
1. Expansive 6-Person Capacity
The "Grand" is the crown jewel of social wellness. With an interior volume of 4.6 m³, it comfortably accommodates 4 to 6 adults without compromising airflow or personal space. The multi-level benching system allows users to find their own "thermal sweet spot," from the intense heat of the upper tier to the milder zones below.
2. Elite Insulation & All-Season Performance
A sauna of this scale requires superior thermal retention. The Jonas Grand is constructed with a patented element-based structure, featuring 5cm PIR insulation boards in the walls, ceiling, and floor. This ensures that even in the height of a UK winter, your 17kW-capable hub reaches peak temperatures rapidly and maintains them with industrial efficiency.
3. Bespoke Exterior Mastery: From Nordic to Shou Sugi Ban
The Jonas Grand is a canvas for your architectural vision. Choose from three premium exterior timber finishes:
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Scandinavian Spruce: The timeless, golden-hued Nordic classic.
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Thermo Pine: Heat-treated for maximum dimensional stability and rot resistance in damp UK climates.
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Shou Sugi Ban: The prestigious Japanese charred-timber finish, offering a striking matte-black aesthetic and a lifespan measured in decades.
4. Hybrid Versatility & Smart Integration
Designed to house the most powerful heaters in the industry—such as the Huum Hive 10.5kW or the Harvia Legend 10.8kW—the Jonas Grand also offers Hybrid Eligibility. You can integrate Harvia Infrared equipment (2x500W) alongside your traditional heater, allowing you to switch between deep-tissue infrared therapy and intense Finnish steam sessions with a tap on your smartphone.
Technical Specifications (Jonas Grand)
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Capacity: 4–6 Persons (Grand Social Layout).
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External Dimensions: 2.16m (W) x 2.78m (D) x 2.49m (H).
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Glass: 8mm Full-Height Tempered Safety Glass (Panoramic Facade).
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Interior Wood Options: Aspen, Black Alder, Thermo Pine, or Premium Thermo Aspen.
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Heating Output: Recommended 9kW–11kW (Requires 3-phase power supply).
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Lighting: Dimmable LED system with optional backrest and side-wall upgrades.
Custom Features: Choice of "Hidden" wooden doors with Buster & Punch hardware or standard full-glass doors.