The ThermaSol outdoor sauna lineup
Three hundred and eighty-nine cubic feet, one configuration, no checkout decisions. The Spectra is ThermaSol’s outdoor cabin for the buyer who wants a finished spec rather than a build sheet. It arrives finished in Thermally Modified Tyrol panels with a 34mm Parsol dark grey glass front and a Firestone EPDM roof.
FAQ
How many people fit?
Three to four adults.
How long does it take to heat up?
Roughly 40 to 55 minutes with the 8 kW Virta in moderate conditions.
Do I need an electrician?
Yes. The Virta needs a 240V hookup.
What’s the warranty?
One year manufacturer warranty.
Can it stay outside year-round?
Yes. Multi-layer insulation, EPDM roof, and thermally modified shell are built for cycling.
What’s the lead time?
Twelve weeks.
Spec sheet
- Footprint: 90 by 82 inches, 91 inches tall, 389 cu ft
- Capacity: 3 to 4 adults
- Heater: 8 kW Harvia Virta with Wi-Fi; CX45 controller
- Glass: 34mm Parsol dark grey
- exterior: Thermally Modified Tyrol Panel; Interior: thermally modified aspen
- Roof: Firestone EPDM; Frame: black aluminum; Multi-layer insulated
- RGB LED; built in the USA by ThermaSol
Construction details
34-millimeter Parsol Dark Grey glass front in a black aluminum frame. Thermally Modified Tyrol panels on every other surface. The wall assembly uses STEICO wood-fiber insulation, which retains heat efficiently and breathes naturally, and the roof is a Firestone EPDM membrane rated for long-term weather exposure.
Why a single configuration
The Spectra collapses the option grid. Same door, same heater, same glass on every unit. We work with the supplier spec sheets directly; this is the cabin we hand to a buyer who would rather not spend an evening picking hinges.
Built by Kirami in Finland
The Spectra is an additional configuration of the Kirami FinVision® production line, built at Kirami’s factory in Sastamala, Finland. The same factory builds the Nordic Misty, Nordic Dawn, and Solaris cabins for the American market, and ships their direct FinVision® counterparts to European customers. The FinVision® line carries the Finnish Key Flag Symbol (Avainlippu): the credential that certifies Finnish-designed, Finnish-manufactured, and built from Finnish materials.
Kirami’s own image archive uses the “kiramibyharvia_kir” file-naming pattern across the production line, making the supply chain visible: Sastamala-built cabin, Harvia heater, ThermaSol distribution to the American premium market. Finnish sauna culture is inscribed on UNESCO’s Representative List of the Intangible Cultural Heritage of Humanity.
Kirami joined the Harvia Group in May 2021, so the heater you choose and the cabin it sits in are now sister-company products engineered together. The integrated LED lighting wires into the Harvia Xenio control panel, which means one controller for heat, time, and ambiance.
Finnish ventilation engineering: fresh air enters through the intake on the heater side wall; spent air exhausts through the vent at the opposite upper back corner. Continuous airflow during a session without the cold drafts that plague poorly ventilated outdoor saunas.
Shipping
Free shipping included. Outdoor cabins ship fully assembled via flatbed trailer. A forklift or crane is required at delivery for placement; manual offloading is not recommended due to size and weight. A licensed electrician handles the heater hookup. We notify customers two weeks before scheduled delivery so the site is ready. The path from the truck to the placement pad must be clear and accessible. Pad should be a firm, level surface with slight drainage runoff: concrete, decking, pavers, or compacted gravel.
Optional hands-on installation
If your delivery timing aligns with our calendar, founders Ben Burger or Ben Frizzell will travel to help with the install in person. The Bens have airdropped into builds with customers across the country since launching the marketplace. This is offered for a limited time and depends on schedule availability. Ask before checkout to see whether your delivery window works.
Prebuilt
Sauna Brushes
Vents