Indoor Sauna Kit | ThermaSol Astra 3–4 Person Glass

The ThermaSol Astra is a freestanding indoor traditional sauna kit for approximately 3–4 people. Its corner-style layout combines semi-panoramic transparent tempered glass, inset black trim, Tyrol wood interior cladding, and thermo-aspen benches and backrests.

The package includes a Harvia Virta 9kW electric heater, Harvia Xenio CX45 digital control with Wi-Fi, temperature sensor, and three boxes of Harvia AC3020 sauna stones. Supported temperature, session-time, and scheduling functions are available through the control and compatible MyHarvia app connectivity when properly installed and connected.

Recessed full-spectrum LED lighting has independent controls. Two headrests and a wood platform are included. Select a left-side or right-side doorway; the cabin arrives flat-packed with preassembled panels for on-site assembly.

Door & Heater Orientation

Left-side doorway: Entry on the left, with the heater along the right wall.

Right-side doorway: Entry on the right, with the heater along the left wall.

Confirm the orientation before ordering. It affects room access, electrical planning, and final placement.

Specifications

Brand and model: ThermaSol Astra Sauna Cabin.

Sauna type: Freestanding indoor traditional sauna kit; flat-packed panels assembled at the installation site.

Capacity: Approximately 3–4 people, depending on user size and preferred seating space.

Exterior: Semi-panoramic transparent tempered glass with inset black trim.

Interior: Tyrol wood cladding.

Benches and backrests: Thermo-aspen wood.

Door handle: Tyrol wood with decorative black trim.

Insulation: Multi-layer wood-fiber wall insulation.

Heater: Harvia Virta 9kW electric sauna heater.

Control: Harvia Xenio CX45 with Wi-Fi and compatible MyHarvia app connectivity.

Lighting: 110V full-spectrum recessed LED with independent controls. This rating applies to the lighting, not the heater's dedicated electrical supply.

Natural wood varies in grain, color, and tone. Review the specification sheet for cabin measurements and installation planning.

What's Included

ThermaSol Astra flat-packed indoor sauna cabin with preassembled panels; Harvia Virta 9kW electric heater; Harvia Xenio CX45 digital control with Wi-Fi; three boxes of Harvia AC3020 sauna stones; temperature sensor; full-spectrum LED lighting system; two headrests; wood platform; installation instructions; and manufacturer warranty documentation.

Site Preparation & Assembly

Flooring: Install indoors on a level, stable, water-resistant surface. Listed options include concrete, ceramic or porcelain tile, water-resistant vinyl, or water-resistant laminate approved for the installation environment. Carpet and moisture-sensitive flooring are not recommended. An alternative foundation may be required if the existing floor does not meet manufacturer requirements.

Access and clearances: Confirm room dimensions, required installation clearances, selected doorway and heater orientation, and a clear route from the delivery point to the installation area. Review the manual before delivery and arrange qualified assembly and electrical installation.

Assembly: Generally requires at least two adults and basic tools. Time varies with site conditions and installer experience. Follow the installation manual and local building requirements.

Relocation: The freestanding cabin can be disassembled and relocated. Relocation requires safe transport, reassembly, and electrical reconnection by qualified professionals.

Electrical Requirements

A licensed electrician must install and connect the sauna heater and control system. The Harvia Virta heater requires a dedicated electrical supply; the LED lighting requires a 110V connection. Confirm all component requirements in the current ThermaSol and Harvia documentation and comply with applicable national and local codes. Do not energize the heater until assembly and electrical installation are complete.

Delivery & Receiving

The sauna arrives by flatbed freight trailer with delivery scheduled in advance. Customers are notified two weeks before scheduled delivery to allow time for preparation. Ensure the site is accessible and ready, and follow the receiving and unloading instructions in the manual.

Residential deliveries: Freight-company offloading and threshold delivery are included at no additional cost; no forklift or loading dock is required. For qualifying locations, threshold delivery is to the first covered threshold or designated accessible entry point.

Commercial deliveries: A customer-provided forklift or loading dock is required for unloading.

Threshold delivery does not include moving panels to the final installation room, room placement, assembly, installation, electrical work, or debris removal. Delivery terms may vary for remote, restricted-access, or complex locations.

Manuals & Documentation

ThermaSol Astra Specification Sheet (PDF)

ThermaSol Astra Installation Manual (PDF)

Warranty

The ThermaSol Astra Sauna Cabin includes a 1-year limited manufacturer warranty. Warranty coverage is provided by ThermaSol and is subject to the manufacturer's installation, operation, maintenance, and residential or commercial-use requirements.

Frequently Asked Questions

How many people does the Astra seat?
Approximately 3–4 people, depending on user size and preferred spacing.

Is the heater included?
Yes. The package includes a Harvia Virta 9kW heater, Xenio CX45 Wi-Fi control, temperature sensor, and three boxes of Harvia AC3020 stones.

Can I choose the door location?
Yes. Choose a left-side or right-side doorway, with the heater on the opposite wall. Confirm the orientation before ordering.

Does the sauna arrive assembled?
No. It arrives flat-packed with preassembled panels for on-site assembly. A licensed electrician must install and connect the heater and control; additional professional assembly help may be appropriate for your site.

Do residential deliveries require a forklift?
No. Qualifying residential deliveries include freight-company offloading and threshold delivery. Commercial locations must provide a forklift or loading dock. Moving panels to the installation room, assembly, electrical work, and debris removal are excluded.