ThermaSol Solaris 2-5 Person Outdoor Sauna Cabin
ThermaSol Solaris 2-5 Person Outdoor Sauna Cabin
- Regular price
- $70,714.00
- Regular price
- $101,020.00
- Sale price
- $70,714.00
- Unit price
- per
Found it lower? We'll match it, before or after you buy.
Send us a link to the lower price. If it is the same model, new and in stock at an authorized U.S. online retailer, we match it. Already ordered? If it was lower on your order date, claim the difference within 30 days.
Excludes sale pricing, marketplace sellers and later price drops.
Read the full price match terms →Solar panels, a battery pack and a 3 kW heater. No trench from the house.
- Off-grid: array and battery included
- Tile clad inside and out, solar-tinted panoramic glass
- TIME Best Inventions 2025
Preorder — ships 12 weeks
This item is currently out of stock. Our next shipment arrives in 12 weeks, and orders ship in the order they were placed.
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How does delivery work?
How does delivery work?
Freight, quoted for your address. These are crated units of roughly 1,300 to 4,800 pounds going to residential addresses, so there is no flat rate. Send us your postcode before you order and we will come back with a real figure.
The outdoor cabins arrive fully assembled. All eight travel as one piece, so there is no build on your weekend, but a forklift or crane has to reach the pad. Measure the gate, the side return and anything overhead first.
The indoor cabins arrive in panels. The Lumaria, Aalto and Astra are built in place by two to four people. What matters is the route in, not the room itself.
Delivery is curbside and someone has to be there. The carrier calls to book a window and brings it to the kerb or driveway. Moving it onto the pad is yours to arrange.
Inspect before you sign. Note any damage on the delivery paperwork while the driver is there, photograph everything, and tell us within 48 hours. Refuse a structurally damaged crate and call us.
Lead times. Twelve weeks on every outdoor cabin, four to eight on the three indoor models, built to order from the day you order.
What does the warranty cover?
What does the warranty cover?
Two warranties, not one. ThermaSol covers the sauna room and Harvia covers the heater inside it. They differ in length and they are claimed in different places.
The sauna room: 1 year. From substantial project completion, covering defective workmanship and materials such as mis-cuts, rough lumber or knot loss.
The heater, control and power box: 5 years residential. One year in a commercial setting. Stones and heating elements carry one year either way.
Two conditions decide most claims. The room must be registered within 15 days of purchase, and installed by a certified electrician or qualified service representative.
Commercial use voids it. ThermaSol excludes residential units used in any non-residential setting, naming hotels, spas, gyms, health clubs and short-term rentals. Tell us before you order and we will quote a range that is warranted for it.
Who you call. Cabin claims go through ThermaSol and we start them for you. Harvia heaters are serviced by Harvia US directly, which is a separate route.
What if I need to return it?
What if I need to return it?
30 days from delivery. Cancelling before it ships costs nothing at all, and on a twelve week cabin there is usually room to change your mind.
Condition required. As new, unused, unassembled and in its original packaging with every component. Once a unit has been sited, connected or assembled it is no longer returnable.
Get an authorisation first. Contact us with your order number, we raise it with ThermaSol, and you ship within 14 days with the authorisation number written on the crate.
What a return costs. A restocking fee of up to 5% may apply and you pay the return freight, which is substantial on a crated sauna. We do not deduct the original outbound shipping. Ask us for an estimate before you commit.
Damaged on arrival is a freight claim, not a return. Note it on the paperwork while the driver is present, photograph it before anything moves, and tell us within 48 hours. Handled that way it costs you nothing.
Refunds. To the original payment method once the unit is received and inspected, normally within 5 to 10 business days.
PRODUCT DESCRIPTION
Jump to12 sections
The short answer
The ThermaSol Solaris is an off-grid sauna that runs on its own solar array
Solar panels, a battery pack and a 3 kW heater, in a cabin that does not need a trench from the house. ThermaSol describes it as the first fully off-grid solar-powered sauna available in the US, and TIME named it to its Best Inventions list for 2025. It is also, by some distance, the most unusual thing in this catalogue.
The ground
86 or 60 in wide
Both sizes are 86 inches deep and 97 high. The Medium is 86 inches wide, the Small 60. No placement clearance is published, so allow working room on all sides.
The people
4 to 5 or 2 to 3
ThermaSol's figures for the Medium and the Small. Tiled interior and exterior surfaces with a solar-tinted panoramic glass wall.
The supply
None, if you want
That is the point. Solar panels and a battery pack come with the cabin. There is no 240 volt circuit to run and no trench to dig.
How the solar works
Panels, a battery, and a heater sized to match
The Solaris package is the cabin, a solar panel array, a battery and power kit, and a 3 kW Harvia KIP heater on a Harvia CX170 control. The array charges the battery; the battery runs the heater and the lighting.
The engineering trade is visible in that 3 kW figure. A conventional cabin this size carries an 8 or 9 kW heater drawing 33 to 38 amps. The Solaris carries a 3 kW heater, because a battery pack cannot sustain 9 kW for an hour. Everything else about the cabin, the insulation and the triple-glazed thermal glass, exists to make a small heater sufficient.
What the maker claims, and what we will not claim for them
Kirami, which builds this cabin, states that its insulation and glazing mean a heater of this size is enough where a sauna of these dimensions would normally call for 8 to 10 kW. That is their claim about their own product and we are not going to repeat it as our assessment. Harvia's own published range for a 3 kW KIP is a room of 84 to 130 cubic feet, which is smaller than this cabin. If heat-up time and holding temperature matter to you, ask us and we will put the question to ThermaSol before you order rather than after.
Inside the cabin
Tiled surfaces and a solar-tinted glass wall
The Solaris is finished in tile inside and out, which is unique in ThermaSol's range and is what gives it the flat, modern look in the photographs. The front carries a solar-tinted panoramic glass wall, and the cabin is delivered turnkey and fully assembled.
One thing we cannot settle for you
ThermaSol describes the interior two different ways on the same page: the prose says brushed alder benches, the specification bullets say Tile Oak for both interior and exterior. Those are not the same material. We have published neither rather than pick a sentence, and we will get it confirmed in writing if it matters to your decision.
And one ThermaSol does not publish
No interior area or linear dimension is published for either size.
Before you order
Five checks, and two of them are specific to solar
1. The sun
An off-grid cabin is only off-grid if the array sees enough light. Shading from trees, a north-facing garden or a long northern winter all change what this cabin can deliver, and none of that is the cabin's fault. Walk the site at the time of year you expect to use it most.
2. The fallback
Decide early whether you want a grid connection as well. Running a supply to the cabin later is a trench and a day's work; specifying it at the start is a line on a drawing.
3. The base
3,064 pounds assembled for the Medium, 2,756 for the Small, before the array. Level, drained and rated for the load.
4. The approach
Delivered fully assembled, so a machine has to reach the pad.
5. The lead time
Twelve weeks, built to order.
How it is built
Three things about the Solaris you cannot change afterwards
The glazing
Solar-tinted panoramic glass, triple glazed. On an off-grid cabin the glazing is not a styling choice, it is part of the energy budget.
The surfaces
Tile-clad inside and out, which ThermaSol describes as modern, durable and UV resistant. It is the only cabin in the range finished this way.
The array
Mounted with the cabin and sized to it. This is a matched system rather than a cabin with panels added, which is why the heater is 3 kW rather than 8.
Heater and circuit
A 3 kW Harvia KIP, and an open question we are not going to hide
The Solaris carries a Harvia KIP at 3 kW on a Harvia CX170 control, with the solar panels and battery pack.
Where the 3 kW figure comes from
It is correct, and it is Kirami's own designation. Their installation manual for this cabin states, in all seven of its languages, that the heater is a Harvia Delta 3.6 kW for Europe, a Delta 2.7 kW for Japan and a Harvia KIP 3 kW for the USA. The Delta is not certified for this market, so the KIP is the substitution. Harvia's 3 kW KIP exists, is UL certified, and draws 12.5 amps at 240 volts single phase on a minimum 12 AWG conductor.
The open question
Harvia lists the 3 kW KIP in two forms: one with built-in controls and one for use with a separate control unit. Only the built-in-control version has a current US item number, and that page is presently flagged as unavailable, while ThermaSol specifies this cabin with a CX170 external control. We have asked ThermaSol to confirm the exact heater and control pairing being shipped to US buyers. Until they do, we would rather you knew the question existed than find it at commissioning.
If you connect it to the grid
Harvia does not publish a breaker rating for any heater in this family, so your electrician sizes the overcurrent device against 12.5 amps under the NEC and local code. Harvia does say plainly that a heater feed must not run through an RCD or GFI.
Running cost
What it costs to run, which is the easy part
Off the array, nothing. That is the proposition.
If you do connect it to a supply, a 3 kW element across a typical hour, counting heat-up and cycling, is roughly 1.8 kilowatt hours. At 17 cents a kilowatt hour that is about $0.31 an hour, or near $4 a month at three one hour sessions a week. It is the cheapest cabin here to run by a wide margin, because it has the smallest heater.
The honest caveat is the same one as above: a small heater is cheap to run and slower to heat a given volume. That trade is the whole design.
What you get
What arrives, and what is separate
In the delivery
The assembled cabin, the Harvia KIP heater and CX170 control, the solar panel array and the battery and power kit. ThermaSol describes it as turnkey.
Not in the delivery
The base, any grid connection you choose to add, the machine that lifts it into place, and site preparation. Freight is quoted rather than published, so talk to us before ordering.
Delivery and siting
Placed once, and placed for the sun
The Solaris arrives fully assembled, up to 3,285 pounds in transit, so machine access to the pad is a requirement.
Unlike every other cabin here, the orientation is a performance decision rather than a view decision. Place it for the array first and the outlook second, or accept that you are trading charge for scenery.
Specifications
ThermaSol Solaris specifications
| Exterior, Medium | 86 in W × 86 in D × 97 in H |
|---|---|
| Exterior, Small | 60 in W × 86 in D × 97 in H |
| Cabin interior | not published by ThermaSol |
| Capacity | Medium 4 to 5, Small 2 to 3 |
| Assembled weight | Medium 3,064 lb, Small 2,756 lb |
| Shipping weight | Medium 3,285 lb, Small 2,976 lb |
| Heater | Harvia KIP, 3 kW, the US specification |
| Control | Harvia CX170 |
| Power | Solar panel array with battery and power kit, included |
| Grid supply | Not required. If fitted, 240 V single phase, 12.5 A, minimum 12 AWG |
| Glazing | Solar-tinted panoramic, triple glazed |
| Finish | Tile clad, interior and exterior |
| Lead time | 12 weeks |
ThermaSol publishes no spec sheet for the Solaris, which is why the interior area, the placement clearance, the array output and the battery capacity are absent above rather than estimated.
Compare models
Where the Solaris sits in ThermaSol's outdoor range
| Model | Exterior | Interior | People | Heater |
|---|---|---|---|---|
| Solaris Medium | 86 × 86 in | not published | 4 to 5 | KIP 3 kW, solar |
| Solaris Small | 60 × 86 in | not published | 2 to 3 | KIP 3 kW, solar |
| Nordic Misty Medium | 87 × 91 in | 44.1 sq ft | 4 to 5 | Virta 9.0 kW |
| Spectra | 82 × 90 in | 51 sq ft | 3 to 4 | Virta 9.0 kW |
| Ombra | 130 × 91 in | 80 sq ft | 4 to 5 | Virta 10.5 kW |
The Solaris is not really competing with the rest of the range. Every other cabin here assumes a 240 volt circuit and carries a heater of 8 kW or more. This one assumes neither. If a supply to the garden is straightforward, the Nordic Misty or the Spectra will heat faster for less money. If running power to the site is the problem you are actually solving, nothing else in the range solves it.
Buyer questions
ThermaSol Solaris questions buyers ask before ordering
Does it really run without mains power?
That is the design. The package includes a solar array and a battery pack, and the heater is sized at 3 kW to match what a battery can sustain. How well it performs in practice depends on your site: shading, orientation and the time of year you intend to use it are all part of the answer, and none of them are specified on ThermaSol's page.
Is a 3 kW heater enough?
Kirami, which builds the cabin, says its insulation and triple glazing mean it is, where a sauna of these dimensions would normally need 8 to 10 kW. That is their claim about their own product and we are not going to present it as our assessment. Harvia's published range for a 3 kW KIP is a room of 84 to 130 cubic feet, which is smaller than this cabin. If heat-up time matters to you, ask us and we will get it answered before you order.
Why is the heater a 3 kW KIP when ThermaSol does not sell one?
Correct, and it is worth explaining. Kirami's own manual for this cabin states the heater as a Harvia Delta 3.6 kW for Europe, 2.7 kW for Japan and a Harvia KIP 3 kW for the USA. The Delta is not certified for this market. Harvia's 3 kW KIP does exist and is UL certified, but it is not on ThermaSol's own heater page, which stops at 4.5 kW.
Is there an issue with the heater and control pairing?
There may be, and we would rather say so. Harvia lists the 3 kW KIP in a built-in-control version and a separate-control version, and only the built-in version currently has a US item number, while ThermaSol specifies this cabin with a CX170 external control. We have put the question to ThermaSol. It is the kind of thing that surfaces at commissioning if nobody asks it first.
Can I connect it to mains as well?
Yes, and it is worth deciding at the start rather than later. Running a supply to the cabin after it is placed means a trench; specifying it up front is a line on a drawing. If you do connect it, the heater draws 12.5 amps at 240 volts single phase on a minimum 12 AWG conductor, and your electrician sizes the breaker.
What is the interior made of?
ThermaSol says two different things on the same page: the prose says brushed alder benches and the specification bullets say Tile Oak inside and out. We have published neither rather than pick a sentence, and we will get it confirmed in writing if it matters to your decision.
Which way should it face?
Towards the sun. On every other cabin in this range orientation is about the view; here it is about charge. Place it for the array first and the outlook second, or accept the trade.
How does it get into my garden?
On a forklift or a crane. It arrives fully assembled at up to 3,285 pounds, so machine access to the pad is a requirement rather than a convenience.
What is the warranty?
One year on the sauna room from substantial project completion, and five years on the Harvia heater, control and power box in a residential setting. Registration is required within fifteen days of purchase.
Is the Solaris certified?
The Harvia heater fitted inside is UL certified. No certification is published for the structure itself, which is normal in this category. A listed heater does not make the structure listed.
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