ThermaSol Astra 4-Person Indoor Sauna Cabin with Semi-Panoramic Glass and Minimalist Scandinavian Design
The Astra is what happens when minimalism gets serious about wellness. ThermaSol stripped the indoor sauna down to its essential elements, crisp brushed Tyrol wood, transparent semi-panoramic glass, and a clean architectural silhouette, without sacrificing any of the performance. The result is a sauna that feels less like a fixture and more like a piece of considered design.
Where minimalism meets tranquility
The Astra's brushed Tyrol wood panels encapsulate a corner-friendly layout, while the transparent glass walls open the interior up to natural light. Inside, the recessed wall supports give the benches a "floating" appearance, no floor legs, no visual clutter, and easier cleaning underneath. It's a small detail that completely changes how the space feels in everyday use.
Materials that hold up to daily heat
Thermo-aspen benches and arched backrests are knot-free and stay cool to the touch even at peak temperature, so longer sessions never become uncomfortable. Multi-layer wood fiber insulation runs throughout the structure for superior heat retention and predictable energy use. The frameless flush-mount glass door completes the look, clean lines outside, full thermal seal inside.
Performance that backs up the design
The Harvia Virta 9kW electric heater is the heart of the Astra, paired with the CX45 digital control with Wi-Fi for precise temperature and timing. Start your sauna from your phone via the MyHarvia app, heat will be ready when you walk in. RGB color therapy LEDs are recessed throughout the cabin with a dedicated control, letting you adapt the lighting to match every mood, from focused white to warm amber.
Where minimalism meets tranquility, the Astra blends crisp brushed Tyrol wood, semi-panoramic glass, and a 9kW Harvia heater into a corner-friendly sauna built for up to 4 people. Floating benches, RGB color therapy, and Wi-Fi heater control come standard.
Up to 4 persons Indoor use Semi-panoramic glass Limited Lifetime warranty Harvia 9kW Wi-Fi heater RGB color therapy lighting Pre-assembled delivery Authorized ThermaSol dealer
Specifications
Dimensions & weight
| Width |
85.4" (216.9 cm) |
| Depth |
85.4" (216.9 cm) |
| Height |
83" (210.8 cm) |
| Assembled weight |
1,323 lbs (600.1 kg) |
| Capacity |
Up to 4 people |
Construction & materials
| Glazing |
Transparent semi-panoramic glass panels |
| Door |
Frameless flush-mount glass |
| Exterior |
Brushed Tyrol wood panels (minimalist) |
| Interior walls |
Brushed Tyrol wood |
| Benches & backrests |
Thermo-aspen (recessed wall supports) |
| Insulation |
Multi-layer wood fiber |
| Lighting |
Recessed RGB LED color therapy with control |
Electrical
| Heater |
Harvia Virta 9kW electric |
| Control |
CX45 digital with Wi-Fi (MyHarvia app) |
| Power source |
240V, single phase |
| Circuit breaker |
40 amp dedicated |
| Temperature range |
Up to 194°F (90°C) |
Configuration & delivery
| Door options |
Left or Right |
| SKU (Door Left) |
14-ASTRADL |
| SKU (Door Right) |
14-ASTRADR |
| Configuration |
Fully assembled |
| Lead time |
4–8 weeks |
| Delivery |
Flatbed trailer, curbside |
What's included
Astra sauna cabin (fully assembled)
Semi-panoramic transparent glass panels
Frameless flush-mount glass door
Brushed Tyrol wood interior & exterior
Thermo-aspen benches and backrests
Recessed wall supports (floating bench design)
Multi-layer wood fiber insulation
Harvia Virta 9kW electric heater
CX45 digital sauna control with Wi-Fi
Sauna stones (Olivine Diabase)
RGB color therapy LED lighting
LED remote control
Why the Astra stands out
Minimalist Scandinavian design
Stripped to the essentials, crisp Tyrol wood, transparent glass, clean lines. A sauna that doubles as a piece of architectural design in any modern interior.
Floating bench design
Recessed wall supports eliminate floor legs entirely, giving benches a clean "floating" appearance and making the space significantly easier to clean underneath.
Semi-panoramic glass
Transparent glass panels open the interior up to natural light, creating an airy feel without sacrificing privacy or thermal performance.
Brushed Tyrol wood
Premium European wood with crisp, refined grain patterns. The minimalist exterior maintains a quiet, intentional aesthetic that pairs with any contemporary interior.
Harvia Virta 9kW + Wi-Fi
Premium Finnish-engineered heater with CX45 digital control. Start your sauna from your phone via the MyHarvia app, heat ready when you arrive.
Fully assembled delivery
Ships fully assembled on a flatbed trailer. No DIY assembly, no contractor required for the cabin, just position, connect electrical, and start using.
About ThermaSol
Premium wellness, made to last
Six decades of steam and sauna engineering
ThermaSol has been engineering steam and sauna systems for residential and commercial wellness for over 65 years. The brand is known for premium build quality, intelligent controls, and designs that take wellness products seriously as architectural elements, not afterthoughts.
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Minimalist Scandinavian design, clean lines, refined materials
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Semi-panoramic glass, light-filled interior, modern aesthetic
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Floating bench design, recessed supports, easier cleaning
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Harvia Virta 9kW heater, premium Finnish engineering with Wi-Fi
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Limited Lifetime warranty, backed by the manufacturer
About ThermaSol
Built for the home, engineered for performance
ThermaSol set out to bring spa-grade saunas and steam systems into private homes, without sacrificing the build quality, performance, or design integrity that defines commercial-grade wellness installations. Every Astra is fully assembled at the factory and shipped ready to use.
The Astra represents what happens when premium materials meet thoughtful engineering: a sauna that performs like a flagship spa, looks like a piece of contemporary architecture, and is backed by a manufacturer with serious heritage in the category.
Manuals & Documents
Everything you need before and after installation
Download the official ThermaSol Astra specification sheet below, it covers materials, dimensions, electrical requirements, included accessories, and assembly clearances. We recommend reviewing it before your delivery arrives so you know what to expect on installation day. Note that a licensed electrician is required for the heater installation.
Warranty
Limited Lifetime Warranty on craftsmanship and structure
ThermaSol stands behind the Astra with a tiered warranty program designed to protect every part of your investment. The cabin's craftsmanship and structural integrity are covered by a Limited Lifetime Warranty, the highest level of protection available in the category. The Harvia Virta heater, controls, and power boxes are covered for 5 years in residential settings, and heating elements and stones for 1 year. All warranty claims go directly through ThermaSol with full factory support. Proof of purchase from an authorized dealer is required to start any claim, and we are an authorized ThermaSol dealer.
