1 7

THERMASOL

FORTIS 4-Person Outdoor Traditional Steam Sauna | By Thermasol

FORTIS 4-Person Outdoor Traditional Steam Sauna | By Thermasol

$52,399.97 USD
$52,399.97 USD
Sale Sold out
Shipping calculated at checkout.

⚠️ Final Sale — Non-Returnable

This product is non-returnable due to safety, hygiene, and quality control standards. If your item arrives damaged or incorrect, contact us within 48 hours at support@fr33domwellness.com. See our full Return & Refund Policy for details.

ThermaSol · Fortis · 4-Person Fully-Assembled Outdoor Sauna Cabin · 8mm Parsol Glass · Harvia Virta + Xenio · EPDM Roof · RGB LED · Made In USA · SAK35896

8mm Parsol Dark Grey Glass Façade Hidden Hinges · Aluminium Framing Contemporary Eave-Style Roofline Firestone EPDM Roof Brushed Thermo-Spruce Walls Thermo-Aspen Benches Harvia Virta Heater Harvia Xenio Control System Multi-Layer Wood Fibre Insulation RGB LED Colour Therapy 4 Person · Outdoor 🏗️ Fully Assembled · Pre-Wired · Turnkey 🇺🇸 Designed & Crafted In The USA

The ThermaSol Fortis is a fully assembled 4-person outdoor sauna cabin built on a striking material contrast — rustic Nordic thermo-spruce and pinewood body, ultra-contemporary 8mm Parsol dark grey glass façade in aluminium framing with hidden hinges, and a modern eave-style roofline that gives the Fortis its unmistakable outdoor presence. Inside, brushed thermo-spruce walls, moisture-resistant thermo-aspen benches, the Harvia Virta heater with Xenio control, multi-layer wood fibre insulation, and RGB LED colour therapy deliver a complete, spa-quality sauna experience — fully assembled, pre-wired, and turnkey from the moment it arrives.

Rustic Nordic warmth behind a contemporary glass façade. The Fortis — where outdoor sauna culture meets architectural boldness, and neither compromises the other. 🌿

👥
Capacity
4 People
🪟
Glass
8mm Parsol Dark Grey
🔥
Heater
Harvia Virta
🎛️
Control
Harvia Xenio

ThermaSol Outdoor Sauna Range — Compare Models

Also Available — Outdoor
Spectra
4 Person · Parsol Glass Front · STEICO Insulation · Firestone EPDM · Fully Assembled
✅ This Model — Outdoor
Fortis
4 Person · 8mm Parsol Glass · Eave Roofline · Harvia Virta + Xenio · Brushed Thermo-Spruce · Made In USA
Eave Roofline · Xenio Control

Premium Material System — Every Layer Considered

🪟
Façade · Door
8mm Parsol Dark Grey Glass · Hidden Hinges · Aluminium Frame
Double the thickness of standard sauna glass, set in aluminium framing with hidden hinges — no visible hardware, seamless contemporary façade, excellent solar protection, and complete privacy.
🌲
Exterior · Walls · Seating
Brushed Thermo-Spruce + Thermo-Aspen Benches
Rustic Nordic thermo-spruce exterior and brushed interior walls in deliberate contrast to the contemporary glass façade. Moisture-resistant thermo-aspen benches for stable, comfortable long-term seating.
🌿
Insulation · Roof
Multi-Layer Wood Fibre + Firestone EPDM Roof
Premium multi-layer wood fibre insulation for year-round heat efficiency, paired with a Firestone EPDM roof membrane — one of the most durable weather-resistant roofing systems available.
🔥
Heater · Control System
Harvia Virta + Harvia Xenio
The Harvia Virta delivers powerful heat and steam. The Xenio provides advanced digital control of temperature, timing, and session parameters — the most sophisticated control system in the ThermaSol outdoor range.
🏠 Contemporary eave-style roofline — architectural identity — the Fortis's modern eave roofline creates a deliberate horizontal overhang that encapsulates the interior and separates it visually from every conventional pitch or flat-roofed sauna alternative. A considered design decision that gives the Fortis its distinctive outdoor presence.
🪟 8mm Parsol dark grey glass façade — hidden hinges, aluminium frame — double the thickness of standard sauna glass, in a clean aluminium frame with hidden hinges that eliminate all visible hardware. Excellent solar protection, complete user privacy, and a seamless contemporary façade that defines the Fortis's aesthetic.
🌲 Brushed thermo-spruce exterior and interior walls — rustic Nordic thermo-spruce and pinewood exterior creates a deliberate, striking contrast to the contemporary glass front. The brushed thermo-spruce continues inside as the wall finish, honouring the Scandinavian sauna tradition throughout.
🛋️ Thermo-aspen benches — moisture-resistant, cool to touch — naturally resists moisture and warping over years of sauna use. The surface remains comfortably cool at elevated temperatures — comfortable for extended sessions without discomfort.
🔥 Harvia Virta heater — powerful heat and steam performance — delivers reliable, powerful heat and steam generation backed by Harvia's Finnish engineering heritage. Consistent therapeutic sauna performance session after session, year after year.
🎛️ Harvia Xenio control system — advanced precision management — the Fortis's most distinct technical differentiator in the ThermaSol outdoor range. Precise digital control of temperature, timing, and session parameters — programmable, precise, and in a different class from analogue alternatives.
🌿 Multi-layer wood fibre insulation + Firestone EPDM roof — premium multi-layer wood fibre insulation delivers exceptional heat retention in every season. The Firestone EPDM roofing membrane provides outstanding weather protection and longevity for year-round outdoor use.
💡 Integrated RGB LED colour therapy — warm amber for deep relaxation, calming blue for decompression, energising red for post-workout recovery. Full colour customisation for every session and every mood.
🇺🇸 Designed and crafted in the USA — fully assembled, pre-wired — arrives completely assembled and pre-wired, no construction required. Position it, connect to your power source, and it is immediately ready.
❤️
Circulation
Regular heat exposure dilates blood vessels and improves cardiovascular conditioning — benefits that compound meaningfully with consistent daily or weekly practice.
💪
Muscle Recovery
Powerful heat and steam penetrate muscle tissue to ease tension, reduce soreness, and accelerate post-exercise recovery in every session.
🧠
Stress Relief
The Fortis's warmth, RGB lighting, and precision Xenio control create a complete personalised sensory environment for deep nervous system decompression.
😴
Better Sleep
The post-sauna physiological cool-down strongly promotes sleep onset and more restorative rest — making a consistent evening session one of the most effective sleep protocols available.
🫧
Skin & Detox
Deep sweating clears pores, flushes impurities, and supports skin circulation — consistent natural detoxification with regular sauna practice.
🏡
Outdoor Statement
The contemporary glass façade and eave roofline make the Fortis a genuine architectural centrepiece — a bold, distinctive addition to any garden, patio, or outdoor living space.
🇺🇸 Designed and crafted in the USA — ThermaSol's US design and manufacturing reflects a commitment to quality, precision engineering, and the product integrity that a premium outdoor wellness investment demands.
🏗️ Fully assembled and pre-wired — turnkey from delivery — arrives completely assembled and pre-wired. No construction, no contractor, no tools required. Position it, connect to your power source, and it is immediately ready.
✅ Warranty — USA Made
The ThermaSol Fortis is backed by ThermaSol's warranty covering manufacturing defects in materials and construction under normal residential use conditions. Contact us for full warranty terms and conditions.
ThermaSol Fortis — Specification Sheet View PDF

🚚 Delivery estimated within 12–13 weeks. Free USA shipping included.

The Fortis arrives fully assembled. Please ensure suitable delivery access for the assembled unit at your address. Contact us before ordering to confirm delivery logistics and any site-specific requirements.

🪟 8mm Parsol Glass · Hidden Hinges  ·  🏠 Eave Roofline  ·  🔥 Harvia Virta  ·  🎛️ Harvia Xenio  ·  🌿 EPDM Roof  ·  🇺🇸 Made In USA

ThermaSol Fortis — Contemporary Architecture. Authentic Heat. 🔥

View full details