ThermaSol Astra Indoor Glass Sauna Cabin 4 Person

A Sauna That Belongs in the Room

Most home saunas look like something you tuck away. The Astra looks like something you design a room around.

A clean-lined corner layout with a panoramic clear-glass front framed in brushed Tyrol wood, it sits open and airy against any interior - no cramped wooden box, just wood, glass, and light. Step inside, settle onto the smooth thermo-aspen benches, and let the Harvia Virta build a deep, even warmth, held exactly where you want it by layered wood-fiber insulation. A full-spectrum light glows softly from the backrest, shifting the mood from bright and clear to low and golden, and the touchpad control means the room can be warming while you're still on your way home. The world stays on the other side of the glass.

The Astra is built from natural Tyrol wood and thermo-aspen, left raw and untreated on the inside the way a real sauna should be - a living material with its own grain and character, one that warms, breathes, and ages with the room rather than a sheet of laminate pretending to be wood. Every session deepens it a little; the cabin becomes more itself the longer you own it.

And it's meant to be built in, not merely delivered. The Astra arrives as pre-finished panels and goes together in clear phases - walls, benches, ceiling, glass - over a weekend, with a few helping hands, a few common tools, and no crane or contractor. It settles right onto your existing floor, and the corner layout comes left- or right-handed to fit the room you have in mind. There's a quiet satisfaction in that: the sauna you helped raise becomes part of the house in a way a wheeled-in box never is.

For the home where the sauna isn't hidden away but built in - a quiet, beautiful fixture of the life you live indoors.

• Indoor corner sauna with a panoramic clear-glass front - open and airy, never cramped
• Natural Tyrol wood interior, left raw and untreated, with smooth thermo-aspen benches and backrest - a material that ages beautifully with the room
• Professional-grade Harvia sauna heat — start and schedule sessions from your phone
• 12-hour delay start and weekly scheduling - pre-heat on your terms
• Full-spectrum LED backrest with independent mood-lighting controls
• Multi-layer wood-fiber insulation for efficient, consistent heat
• Left- or right-corner layout; seats 4-5
• Pre-finished panels assembled in clear phases - a weekend project for two to four people, no crane
• Sits on your existing level floor; can be disassembled and relocated

Can I put the Astra anywhere in the house?
Almost - it needs a dry, climate-controlled room with an existing level, water-resistant floor, and a spot where the 4.3" vent duct can run outside the wall cavity. Confirm that duct run is possible before you order; beyond that, the panoramic glass corner is designed to blend into living spaces, not hide in a basement.

How hard is it to assemble?
It's a guided, multi-phase build rather than a flat-pack chair. Plan on two to four people over a weekend, with common tools - a drill, level, ladder, and rubber mallet. The panels are pre-finished and the joints are pre-drilled, so it goes together in a clear sequence, but the tempered glass goes in last and needs careful two-person handling.

Do I need a contractor or a crane?
No. The Astra arrives as pre-finished panels with on-site offloading, so there's no crane and no contractor - just two to four capable people. The one professional you do need is a licensed electrician for the wiring.

What electrical setup does it need?
The 9kW Harvia Virta heater needs a dedicated 240V, 40-amp circuit; the lighting runs on 110V. All electrical work - heater, controller, and LED wiring - must be completed by a licensed electrician, and is done during assembly.

Does it need a special floor?
It sits directly on existing level, water-resistant flooring - concrete, ceramic tile, vinyl, or laminate. If your floor doesn't qualify, an alternative base may be needed.

Can I control it from my phone?
Yes - the Harvia Xenio control offers a 12-hour delay start, weekly scheduling, and Wi-Fi control through the MyHarvia app, so it's hot when you want it.

How long does the sauna take to heat up?
Most traditional saunas of this size reach bathing temperature in roughly 30–60 minutes depending on the room. The Harvia Xenio control takes the waiting out of it — schedule sessions up to 12 hours ahead or start the heater remotely from the MyHarvia app, so the sauna is hot when you walk in.

Can I move it later?
Yes - it can be disassembled and relocated. Because of the glued ceiling frame, the glass handling, and the vent connection, treat a move as a planned reinstall rather than a quick shuffle.