ThermaSol Solaris: Off-Grid Solar-Powered Sauna, Sizes & Pricing (2026
ThermaSol Solaris: The World's First Off-Grid Solar-Powered Sauna
The ThermaSol Solaris Medium — recognized by TIME as one of the Best Inventions of 2025, running entirely on solar power with no electrical hookup required.
Every outdoor sauna on the market shares one requirement: a power connection. The ThermaSol Solaris breaks that rule entirely. It's the first fully off-grid, solar-powered sauna available in the U.S. — a genuine engineering achievement recognized by TIME magazine, not just a marketing claim. Here's exactly how it works, what the two sizes cost, and who it actually makes sense for.
What Makes the Solaris Different
The Solaris runs entirely on integrated solar panels and battery storage — no electrical hookup, no trenching a line to your yard, no dependence on your home's power grid at all. It's built for locations traditional saunas simply can't reach: remote properties, off-grid land, lakeside retreats, or any backyard where running new electrical service would be expensive or impossible.
Every other outdoor sauna in ThermaSol's lineup — the Nordic Misty, Nordic Dawn, Fortis, Spectra — still requires a real electrical connection, whether that's a standard outlet or a dedicated circuit. The Solaris is the only model in the entire outdoor collection that operates completely independent of your property's electrical infrastructure.
That independence is what earned it a spot on TIME's Best Inventions of 2025 list. It's not a solar-assisted sauna that still needs a backup plug — it's engineered to run entirely on sunlight, with a battery system storing enough charge to deliver a full sauna session even after the sun goes down.
How the Solar System Actually Works
Solar panels are mounted directly on the roof and one exterior wall of the cabin, feeding an integrated battery pack. According to ThermaSol's own specifications, the system requires just one full day of sunlight for a complete charge — after that, the Harvia KIP 3kW heater, RGB LED lighting, and Wi-Fi-enabled Harvia Xenio CX45 control system all run from stored battery power, letting you use the sauna whenever you want rather than only during daylight hours.
A mobile app lets you monitor power levels and system performance in real time, so you always know how much charge is available before starting a session — a genuinely useful feature for a product where power management is central to the experience.
One detail worth knowing: while the Solaris itself requires no electrical hookup to operate, local code may still require a licensed electrician to inspect or complete the heater connection depending on your jurisdiction. Check with us before your install date if you're unsure what your local requirements are.
Small vs. Medium: Sizes & Pricing
Solaris Small
SKU 14-KIR-4560 · 60"W x 86"D x 97"H · 2,756 lbs
Shop the Solaris Small →
Solaris Medium
SKU 14-KIR-4561 · 86"W x 86"D x 97"H · 3,064 lbs
Shop the Solaris Medium →Both sizes ship fully pre-assembled via flatbed freight carrier — you're not building this on-site, you're placing it. A forklift is recommended for unloading given the weight (nearly 3,000 lbs even for the Small), though manual unloading with 3–4 people is possible if needed. You'll be contacted roughly two weeks before delivery to coordinate.
Full Specifications
| Feature | Small | Medium |
|---|---|---|
| Price | $66,645.00 | $70,714.00 |
| Capacity | 2–3 Person | 4–5 Person |
| Exterior dimensions | 60"W x 86"D x 97"H | 86"W x 86"D x 97"H |
| Weight | 2,756 lbs | 3,064 lbs |
| Shipping weight | 2,976 lbs | 3,285 lbs |
| Cladding | UV-resistant Tile Oak, interior and exterior | |
| Benches | Brushed alder, 24" bench depth | |
| Heater | Harvia KIP 3kW, Wi-Fi enabled | |
| Controls | Harvia Xenio CX45 digital control, Wi-Fi | |
| Lighting | RGB LED color therapy, app-controlled | |
| Power source | Integrated solar panels + battery pack, fully off-grid | |
| Glass | Solar-tinted full-length door and panoramic window, alder framing | |
| Setup | Fully pre-assembled, arrives via flatbed freight | |
| Warranty | 1-year manufacturer limited warranty | |
Where It Sits in ThermaSol's Outdoor Lineup
| Model | Power Source | Style | Starting Price |
|---|---|---|---|
| Nordic Misty | Standard electrical | Modular, expandable | $31,883 |
| Nordic Dawn | Standard electrical | Fixed 4-person, thermo-pine | $33,467 |
| Fortis | Standard electrical | Fixed 4-person, glass-forward | $36,619 |
| Spectra | Standard electrical | Fixed 4-person, luxury glass | $39,550 |
| Solaris | Fully solar, off-grid | Fixed 2–5 person, Tile Oak | $66,645 |
The Solaris is priced well above every other model in ThermaSol's outdoor collection — and that gap reflects genuinely different engineering, not just premium branding. Every other model in the lineup is a beautifully built cabin that still depends on your property's electrical system. The Solaris is a self-contained power system with a sauna built around it, which is a fundamentally different (and more expensive) product to manufacture.
If your property already has reliable electrical access to your install location, the Nordic Misty, Nordic Dawn, Fortis, or Spectra will deliver the ThermaSol sauna experience at a significantly lower price. The Solaris earns its premium specifically when off-grid capability is a real requirement, not just a nice-to-have.
Who the Solaris Is Actually For
- Remote or off-grid properties — land without existing electrical infrastructure, where trenching a new line would be expensive or impractical
- Lakeside, cabin, or vacation properties — locations where running permanent electrical service isn't worth the investment for occasional use
- Sustainability-focused buyers — households specifically prioritizing solar/renewable-powered equipment as part of a broader off-grid or eco-conscious lifestyle
- Hospitality and retreat properties — glamping sites, eco-resorts, and wellness retreats that want a genuine sauna experience without expanding electrical capacity
- Buyers who already have simple electrical access — for this group, the Nordic Misty or Nordic Dawn will deliver comparable ThermaSol build quality at roughly half the price
Frequently Asked Questions
Does the ThermaSol Solaris really require no electrical connection at all?
Yes — the Solaris is designed to operate entirely on its integrated solar panels and battery pack. The heater, lighting, and Wi-Fi control system all draw from stored solar power rather than your home's electrical grid. Local code may still require a licensed electrician to inspect the installation depending on your jurisdiction.
How much sunlight does the Solaris need to fully charge?
According to ThermaSol's specifications, the Solaris requires approximately one full day of sunlight for a complete charge, after which the battery system can power a sauna session even after dark.
What's the difference between the Small and Medium Solaris?
The Small seats 2–3 people, measures 60"W x 86"D x 97"H, and starts at $66,645. The Medium seats 4–5 people, measures 86"W x 86"D x 97"H, and costs $70,714. Both share identical materials, heater, and solar system — the difference is interior capacity and footprint.
Why is the Solaris so much more expensive than ThermaSol's other outdoor saunas?
The Solaris is a fully self-contained power system built into the cabin, not just a sauna that plugs into existing electrical service. That off-grid solar and battery engineering is what separates it from models like the Nordic Misty or Nordic Dawn, which rely on your property's existing electrical infrastructure and are priced significantly lower as a result.
How is the Solaris delivered and installed?
The Solaris arrives fully pre-assembled via flatbed freight carrier. You'll be contacted roughly two weeks before delivery. A forklift is recommended for unloading given the unit's weight, though manual unloading with 3–4 people is possible if a forklift isn't available on-site.
What's included with a Solaris purchase?
Each Solaris includes the pre-assembled cabin, the integrated solar panel system, the Harvia KIP 3kW Wi-Fi-enabled heater, the Harvia Xenio CX45 digital control system, one box of Harvia AC3000 sauna stones, installation instructions, and a 1-year manufacturer limited warranty.
Is the Solaris actually recognized by TIME magazine?
Yes — the ThermaSol Solaris was named to TIME's Best Inventions of 2025 list, recognized as the first fully off-grid, solar-powered sauna available in the United States.
Is the Solaris currently in stock?
Yes — both the Small and Medium sizes are currently in stock and available to order through Collective Relaxation.
Ready to Go Off-Grid?
Both Solaris sizes are in stock now. Our team can walk you through sizing, delivery logistics, and whether your install location is ready.
📞 929-493-4366 | 📧 Jerry@CollectiveRelaxation.com | Mon–Fri 9am–5pm EST
Written by Jerry Vaiana — About Jerry
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