Expert help that stays with you

Whether you’re choosing one component or planning the whole room, small details can become expensive problems once installation begins. We know the products we sell and the questions to ask early, helping catch mismatched components, overlooked requirements, and installation issues while they are still easy to fix.

Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

Sauna and heater customers also receive free shipping on sauna accessories for life.

Planning a sauna, or need help with one you purchased from us? Our founders have assembled many of the saunas we sell, visited the manufacturers, and use these products every day. New customers and existing Sauna Marketplace sauna and heater owners can Book a Ben consultation.

Specs
Weight1764 lbs
Dimensions87.0 × 87.0 × 83.0 in
Exterior Longest Side (in)Maximum Exterior Length of the longest side when assembled.87.0
Exterior Shortest Side (in)87.0
Exterior Height (in)Maximum exterior height from earth to roof peak83.0
Volume (cu ft)Not adjusted for glass or insulation.364
KW
People3, 4
Made in
MaterialsBrushed Tyrol Wood Panel + Thermo-Aspen Benches
Interior MaterialsBrushed Tyrol Wood Panel
Exterior MaterialsBrushed Tyrol Wood Panels
InsulationYes – European StandardEuropean Sauna Construction Standards consist of a thick, insulated wall assembly that maximizes the drying potential of interior and exterior cladding. The typical wall assembly consists of Exterior Cladding -> Air Gap -> Rain Barrier -> Studded Wall with Mineral Wool Insulation -> Foil Radiant Barrier with Taped Seams -> Air Gap -> Interior Cladding.
Wi-Fi OptionYes
DIY FriendlyDIY Friendly Saunas means a professional is not required for the build. Basic tools like a drill, hammer, and level are typically required. With Sauna Marketplace, you do not risk your warranty by assembling a sauna yourself. If you prefer a professional installation, please reach out to the Sauna Marketplace team so we can check for a trusted installer near you.Yes*An electrician is still required for all electrical work!
Warranty1
ModelAalto
LineCube
Shipping CostPlease inquire if shipping outside the continental USA.Free
Shipping MethodFlatbed – Forklift or Crane Required On Site
Door SideLeft, Right
BrandThermaSol
Sub-BrandAalto
ManufacturerThermaSol
Sauna TypeIndoor
Heater TypeElectric
Heater BrandVirta
ControllerCX45
GlassTransparent Glass Panoramic Front
UPC652592097915
Lead Time4-8 Weeks
FeaturesBrushed Tyrol Wood Panel Interior, Thermo-Aspen Benches, Panoramic Glass Front, RGB LED Color Light Therapy, Wi-Fi-Enabled Harvia Virta Heater, Flat-Packed Indoor Assembly
Bench Depth (in)24
AssemblyFlat-Packed Indoor
Attachments
Gallery

ThermaSol Aalto Sauna Cabin | 9.0 kW

Named for Finnish architect Alvar Aalto, the cabin is ThermaSol’s design-forward indoor option. The Aalto is an indoor sauna sized for transformation: 87 by 87 inches, 83 inches tall, drops into a finished basement or spa room without drywall demo or a foundation pour. Full-height transparent panoramic glass front, 9 kW Harvia Virta behind safety rails, brushed Tyrol panel interior with Thermo-Aspen benches. Pick door side at checkout. Designed and crafted by Finland’s best, most experienced team.

Build Your Quote:

$23,455.00

Door Orientation

Choose which side the door is hinged on. Stand facing the front of the cabin.

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Zero Interest Payments:

Buy Now, Pay Later with premium financing packages only available on Sauna Marketplace.

Pay with HSA/FSA:

We teamed up with FLEX to make HSA/FSA payments easier than ever.

The ThermaSol indoor sauna lineup

The Aalto is an indoor sauna that reads like a wood-paneled room, not a fiberglass cabinet. 87 by 87 inches, 83 inches tall, with a full-height transparent panoramic glass front and a Harvia Virta 9 kW heater behind safety rails. It is the family’s largest standard indoor footprint.

Why this exists

Indoor saunas in North America are still mostly clip-together kits that show their assembly seams. The Aalto is a flat-packed cabin built to a finished-furniture spec: brushed Tyrol wood panel interior, 24-inch deep Thermo-Aspen benches, a real CX45 controller, RGB LED color light therapy. Two people assemble it in a day.

Spec sheet

  • Footprint: 87 by 87 inches, 83 inches tall, 364 cu ft
  • Capacity: 3 to 4 adults
  • Heater: 9 kW Harvia Virta with Wi-Fi; CX45 controller
  • Glass: transparent panoramic front
  • Interior: brushed Tyrol; 24-inch Thermo-Aspen benches
  • Flat-packed indoor; DIY friendly; left or right door
  • Lead time: 4 to 8 weeks; Designed and crafted in the USA by ThermaSol

FAQ

How many people fit?

Three to four adults.

How long does it take to heat up?

30 to 45 minutes indoors.

Do I need an electrician?

Yes; 240V hookup.

What’s the warranty?

One year manufacturer warranty.

What’s the lead time?

4 to 8 weeks.

Shipping

Free shipping included. Indoor cabins ship flat-packed via flatbed trailer with pre-assembled panels and detailed installation instructions. Assembly typically takes two people, basic tools, and a few hours. A licensed electrician handles the heater hookup. A forklift is recommended for unloading, but the unit can also be offloaded manually piece-by-piece with three or four people in roughly 30 to 60 minutes. Indoor cabins sit on existing flooring (must be level and water-resistant: concrete, tile, vinyl, or laminate). Cabins are freestanding and can be disassembled and relocated. We notify customers two weeks before scheduled delivery.

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.

Expert help that stays with you

Whether you’re choosing one component or planning the whole room, small details can become expensive problems once installation begins. We know the products we sell and the questions to ask early, helping catch mismatched components, overlooked requirements, and installation issues while they are still easy to fix.

Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

Sauna and heater customers also receive free shipping on sauna accessories for life.

Planning a sauna, or need help with one you purchased from us? Our founders have assembled many of the saunas we sell, visited the manufacturers, and use these products every day. New customers and existing Sauna Marketplace sauna and heater owners can Book a Ben consultation.

Specs
Weight1764 lbs
Dimensions87.0 × 87.0 × 83.0 in
Exterior Longest Side (in)Maximum Exterior Length of the longest side when assembled.87.0
Exterior Shortest Side (in)87.0
Exterior Height (in)Maximum exterior height from earth to roof peak83.0
Volume (cu ft)Not adjusted for glass or insulation.364
KW
People3, 4
Made in
MaterialsBrushed Tyrol Wood Panel + Thermo-Aspen Benches
Interior MaterialsBrushed Tyrol Wood Panel
Exterior MaterialsBrushed Tyrol Wood Panels
InsulationYes – European StandardEuropean Sauna Construction Standards consist of a thick, insulated wall assembly that maximizes the drying potential of interior and exterior cladding. The typical wall assembly consists of Exterior Cladding -> Air Gap -> Rain Barrier -> Studded Wall with Mineral Wool Insulation -> Foil Radiant Barrier with Taped Seams -> Air Gap -> Interior Cladding.
Wi-Fi OptionYes
DIY FriendlyDIY Friendly Saunas means a professional is not required for the build. Basic tools like a drill, hammer, and level are typically required. With Sauna Marketplace, you do not risk your warranty by assembling a sauna yourself. If you prefer a professional installation, please reach out to the Sauna Marketplace team so we can check for a trusted installer near you.Yes*An electrician is still required for all electrical work!
Warranty1
ModelAalto
LineCube
Shipping CostPlease inquire if shipping outside the continental USA.Free
Shipping MethodFlatbed – Forklift or Crane Required On Site
Door SideLeft, Right
BrandThermaSol
Sub-BrandAalto
ManufacturerThermaSol
Sauna TypeIndoor
Heater TypeElectric
Heater BrandVirta
ControllerCX45
GlassTransparent Glass Panoramic Front
UPC652592097915
Lead Time4-8 Weeks
FeaturesBrushed Tyrol Wood Panel Interior, Thermo-Aspen Benches, Panoramic Glass Front, RGB LED Color Light Therapy, Wi-Fi-Enabled Harvia Virta Heater, Flat-Packed Indoor Assembly
Bench Depth (in)24
AssemblyFlat-Packed Indoor
Attachments
Gallery

PLAN THE WHOLE SAUNA

The room and heater still have to work as one system.

Start with the room dimensions, then account for glass, masonry, insulation, ceiling height, required clearances, and available electrical service. That is how we move from a product that looks right to a sauna that heats evenly and comfortably.