ThermaSol Spectra Outdoor Sauna Cabin (3-4 Person)

Sculptural by Day, a Retreat by Evening

A sauna doesn't have to hide at the back of the yard. The Spectra is built to be looked at.

Compact and sharply modern, it makes a sculptural statement in a garden, on a patio, or at the edge of a terrace - a mirror-dark glass façade set into warm, thermally modified Tyrol wood with black aluminum framing. From the outside it reads as architecture; the 34mm Parsol dark-grey glass reflects the sky and the trees while keeping the interior private. Step inside and the same space turns intimate and quiet.

Brushed Tyrol wood walls wrap a cabin warmed by smooth thermo-aspen benches - a wood chosen because it stays comfortable to the touch even at full heat, and stable against moisture year after year. The 8kW Harvia Virta builds a deep, even warmth - adjustable up to 194°F - and the Harvia Xenio control lets you set a delay start, schedule sessions, and pre-heat from your phone over Wi-Fi, so it's ready when you walk out. RGB LED lighting with a remote shifts the mood from bright and clear to low and golden.

Built to live outdoors in any season: multi-layer wood-fiber insulation for efficiency, and a durable Firestone EPDM roof to handle weather year-round. The Spectra arrives fully assembled on a flatbed - no panel-by-panel build - though at over a ton it's set in place by crane and wired by a licensed electrician, so it's a planned installation rather than a same-afternoon setup.

For the backyard where the sauna is a centerpiece, not an afterthought - a quiet, beautiful fixture of the life you live outdoors.

• Compact, sculptural outdoor cabin with a mirror-dark glass façade - a design centerpiece, not a shed
• Thermally modified Tyrol wood exterior with black aluminum framing
• Brushed Tyrol wood interior walls with smooth thermo-aspen benches
• 34mm Parsol dark-grey glass front for privacy and solar protection
• 8kW Harvia Virta heater (up to 194°F) with Harvia Xenio Wi-Fi control + MyHarvia app
• 12-hour delay start and weekly scheduling - pre-heat on your terms
• RGB LED lighting with remote for personalized mood lighting
• Multi-layer wood-fiber insulation + durable Firestone EPDM roof - built for all seasons
• Compact footprint (90" L x 82" W x 91" H); seats 3-4
• Arrives fully assembled; requires crane offload and licensed-electrician hookup
• Included: sauna stones, control, sensor, 2 headrests, and wood platform

Sauna use isn't right for everyone. Consult your physician before use, especially if you are pregnant or have a heart condition, high or low blood pressure, or any cardiovascular or other medical concern. Begin with shorter, lower-heat sessions, hydrate, avoid alcohol before use, don't exceed ~30 minutes, and supervise children. Use only clean water on the stones. Install outdoors on a firm, level surface, keep the air outlet unobstructed, and have the heater wired by a licensed electrician.

• Free shipping in the continental US; cost quoted by location
• Delivered fully assembled via flatbed trailer, ~12-13 weeks; notified ~2 weeks ahead
• This is a large, heavy unit (assembled ~2,205 lbs; shipping ~2,425 lbs) - a crane is required for offloading and placement, and the customer is responsible for coordinating the required equipment and offloading. Manual offloading is not recommended; have the proper equipment on site at delivery
• The path from the delivery point to the placement site must be clear and accessible for that equipment
• Plan your space: the cabin is 90" L x 82" W x 91" H; site it on an open outdoor space clear of obstructions
• Install on a firm, level surface with slight runoff for drainage - concrete, decking, pavers, or compacted gravel. If installing on an existing deck or platform, verify the structure can safely support the combined weight of the cabin, occupants, and equipment
• Electrical: the 8kW Harvia Virta requires a dedicated 240V circuit; all electrical work must be completed by a licensed electrician
• Ventilation: the air outlet must remain unobstructed and easily accessible

Download the ThermaSol Spectra specification sheet (PDF)

Is the Spectra an indoor or outdoor sauna?
Outdoor only. It's a fully assembled, all-season cabin designed exclusively for outdoor use - gardens, patios, and backyard spaces - with a Firestone EPDM roof and insulated construction.

How many people does it seat?
Three to four, in a compact 90" x 82" footprint.

Does it really arrive fully assembled?
Yes - it ships fully assembled on a flatbed trailer, so there's no panel-by-panel build. Because it weighs over a ton, a crane is required to offload and place it, and you'll coordinate the offloading equipment. A licensed electrician wires the heater. Plan it as a scheduled installation rather than a same-day setup.

What surface can I put it on?
A firm, level surface with slight runoff for drainage - concrete, decking, pavers, or compacted gravel. On an existing deck, verify the structure can support the combined weight of the cabin, occupants, and equipment.

What electrical setup does it need?
The 8kW Harvia Virta heater runs on a dedicated 240V circuit. All electrical work must be completed by a licensed electrician.

Is it built for cold-weather / year-round use?
Yes. Multi-layer wood-fiber insulation and a durable Firestone EPDM roof are designed for all-season performance.

Can I control it from my phone?
Yes - the Harvia Xenio control offers a delay start, weekly scheduling, and Wi-Fi control through the MyHarvia app, so it's hot when you want it.

What's the warranty?
The sauna structure carries a 1-year limited warranty against manufacturing defects from completion of installation. The Harvia heater, Xenio control, and power box are covered for 5 years in residential use (stones and heating elements, 1 year). To keep coverage valid, the sauna must be installed by a certified electrician and registered within 15 days of purchase. Full terms at thermasol.com/pages/warranty.

What's included?
Sauna stones, the control and temperature sensor, two headrests, a wood platform, and MyHarvia app access. Optional accessories (pail and ladle, cushions, aromatherapy, decorative stones, timer) are available.