SaunaBox^® Forge Indoor 1-Person: Traditional Finnish Sauna

• Traditional dry sauna: An electric heater and sauna stones warm the cabin.
• Heat up to 200°F: An adjustable thermostat lets you choose your preferred setting.
• 3.5 kW Harvia^® heater: Vega Compact with separate timer and temperature controls.
• Canadian Hemlock: Natural wood interior and black painted wood exterior.
• Personal 1-person cabin: Bench seating, ergonomic backrest, and footrest.
• Ambient lighting: Color-selectable RGB LEDs inside the cabin.
• Designed for indoors: A compact footprint for a suitable home gym, wellness room, or spare room.
• 240V hardwired installation: A dedicated circuit and licensed electrician are required.

Traditional sauna heat. Up to 200°F.

Forge Indoor uses a Harvia electric heater to heat sauna stones and warm the surrounding air, creating the enveloping heat of a traditional Finnish-style sauna. Choose your temperature with the thermostat, then settle into a session that is entirely your own.

Prefer a burst of steam? Small amounts of water can be ladled onto the heated sauna stones in accordance with the Harvia operating instructions, briefly increasing humidity and changing the feel of the heat.

Powered by a 3.5 kW Harvia^® heater

At the heart of Forge Indoor is the Harvia Vega Compact 3.5 kW electric sauna heater. Two manual dials keep operation straightforward: one controls the timer, and the other adjusts the temperature.

Allow approximately 25 minutes to reach 170°F. Higher temperatures take longer, and warm-up time varies with room temperature and operating conditions.

Canadian Hemlock. Made to feel at home.

A light-toned Hemlock interior brings natural warmth and visible wood grain to the cabin. Its low-resin, low-odor character keeps the space understated, while the black painted Canadian Hemlock exterior gives Forge Indoor a clean architectural finish.

The tempered glass door opens the view into the cabin. An illuminated oval handle, slatted wood detailing, and integrated side ventilation complete the design.

A personal sauna, down to the details

The single-person bench, S-shaped ergonomic backrest, and included footrest give you a dedicated place to sit and unwind. Select your preferred ambient light color, find a comfortable position, and make a little room in your day for yourself.

A compact indoor sauna for your space

Forge Indoor measures approximately 43.3 inches wide, 41.3 inches deep, and 80.7 inches tall. Its compact cabin makes a traditional home sauna possible within a suitable existing room.

Choose a dry, ventilated indoor location with a level floor that supports the sauna and its occupant. Allow additional space for the door to open, assembly, ventilation, overhead connections, and maintenance. The cabinet dimensions alone are not the required installation clearance.

Product specifications

• Capacity: 1 person
• Sauna Type: Traditional Finnish-style dry sauna
• Maximum Temperature: Up to 200°F
• Heater: Harvia^® Vega Compact 3.5kW electric heater
• Heat-Up Time: Approximately 25 minutes to 170°F; varies by ambient conditions
• Construction: Canadian Hemlock interior with black painted Canadian Hemlock exterior
• Door: Full-length tempered glass
• Lighting: Color-selectable RGB ambient lighting and illuminated oval handle
• Seating: Single bench with ergonomic S-shaped backrest and footrest
• Ventilation: Integrated side ventilation
• Exterior Dimensions: 43.3″ W × 41.3″ D × 80.7″ H
• Unit Weight: 432 lbs
• Electrical Requirements: Dedicated 240V circuit with a 20A double-pole breaker; hardwired by a licensed electrician
• Assembly: Approximately 2 hours with 2 adults, excluding electrical installation
• Placement: Indoor use only

Warm-up times and maximum temperature depend on ambient conditions, installation, and use. Electrical installation must follow the current SaunaBox and Harvia manuals and applicable local codes.

What’s included

• Forge Indoor sauna cabin panels and tempered glass door
• Harvia^® Vega Compact 3.5 kW electric heater
• Bench and ergonomic backrest
• Footrest and wooden heater guard
• Integrated RGB ambient lighting
• Sauna bucket and ladle
• Thermometer and sand timer
• Assembly hardware and instructions

The Forge is hardwired to a dedicated 240V circuit and must be installed by a licensed electrician. This is not a plug-in sauna. The electrical connection is a one-time installation — once it is done, the sauna operates with no ongoing electrical maintenance. 

What electrical circuit does The Forge require? 

A dedicated double-pole 240V circuit, typically protected by a 20A double-pole breaker. The heater draws 14.4A at operating load. Confirm the exact breaker size with your local electrician.

Up to 200°F (93.3°C), measured above the heater at the top of the cabin. Bench level reads lower, since heat rises. You will reach a usable sauna temperature of 170°F (76.7°C) in about 25 to 45 minutes from a cold start.

This is a traditional dry sauna — not infrared. The Harvia Vega Compact heater warms the air and the sauna rocks to high temperatures (up to 200°F / 104°C). You can pour water over the rocks to create a brief burst of steam (löyly), but the primary experience is dry heat. Infrared saunas heat your body directly at lower ambient temperatures. If you want the authentic Finnish sauna experience — intense heat, the option to add steam, and the ritual of high temperature bathing — The Forge is the right choice.