Bring a spa-quality sauna experience to your own backyard with the SAK25470 4-Person Outdoor ThermoWood Cube Sauna Kit. Built from premium thermally modified wood and designed for year-round outdoor use, this sauna combines durable construction, panoramic glass views, and warm LED ambiance into a single, beautifully crafted structure. Whether you're unwinding solo or sharing the space with family and friends, it delivers a consistent, comfortable heat session in a setting that complements any outdoor living area.
Why Customers Choose This Sauna
- Seats up to four people comfortably — ideal for couples, families, and small groups
- Thermally modified wood resists moisture, warping, and decay for lasting outdoor performance
- Panoramic glass panels bring in natural light and open sightlines to the surrounding landscape
- Integrated LED lighting creates a calm, adjustable atmosphere for any time of day
- Optional Harvia KIP 8.0kW heater available for a complete, ready-to-use setup
- 5-year structural guarantee provides long-term confidence in your investment
- Free USA shipping with delivery in 5–10 business days
Product Highlights
Premium ThermoWood Construction
The sauna is built from thermally modified wood — a material treated with heat to enhance its resistance to moisture, insects, and weathering. This process extends the lifespan of the structure and maintains its appearance over time without the need for chemical treatments.
Panoramic Glass Design
Large glass panels on the front face of the sauna allow natural light in and provide an open view of your outdoor surroundings. The glass is designed to retain heat effectively while adding a modern, architectural aesthetic.
Integrated LED Lighting
Built-in LED lighting lets you set the mood for your session. The warm, low-level illumination is energy-efficient and adds a polished, finished look to the interior.
Flexible Heater Options
Choose the sauna kit without a heater if you already own a compatible unit, or add the Harvia KIP 8.0kW heater with built-in controller in black or silver. The Harvia heater is a well-regarded electric sauna heater suited for spaces of this size.
Energy-Conscious Design
The sauna's insulated construction is designed to reach and maintain target temperatures efficiently, reducing the energy required per session compared to less-insulated alternatives.
Versatile Placement
Designed primarily for outdoor installation, the sauna can also be placed indoors in spaces with adequate ventilation and appropriate flooring. Consult a qualified installer to confirm suitability for your specific location.
Specifications
| Model | SAK25470 |
| Capacity | Up to 4 persons |
| Interior Depth | Approximately 5+ feet |
| Wood Material | Thermally modified wood (ThermoWood) |
| Glazing | Panoramic glass panels |
| Lighting | Integrated LED |
| Heater Options | No heater / Harvia KIP 8.0kW Black / Harvia KIP 8.0kW Silver |
| Heater Controller | Built-in (Harvia variants) |
| Primary Use | Outdoor (indoor-compatible with proper ventilation) |
| Structural Guarantee | 5 years |
| Shipping | Free USA shipping; ships within 1–3 business days, delivers in 5–10 business days |
Ideal For
- Homeowners looking to add a dedicated wellness space to their backyard
- Couples or small families who want to share a regular sauna routine
- Those seeking a durable, low-maintenance outdoor structure built for multi-season use
- Buyers who want a complete kit with an optional premium heater included
- Properties with existing outdoor living areas, decks, or garden spaces
Important Information
- Installation: Professional installation is strongly recommended. Ensure the installation site has a level, stable surface and meets local building code requirements. Check with your local authority regarding any permits required for permanent outdoor structures.
- Electrical: The Harvia KIP 8.0kW heater requires a dedicated electrical circuit. All electrical connections must be performed by a licensed electrician in accordance with local codes.
- Ventilation: If installing indoors, the space must have adequate ventilation as specified in the product manual. Do not operate in an unventilated enclosed space.
- Maintenance: Periodically inspect the wood, glass seals, and heater components. Refer to the included manual for care and maintenance guidelines.
- Safety: Keep the sauna area clear of flammable materials. Do not leave the heater unattended while in operation. Follow all manufacturer safety instructions provided in the product manual.
- Floor Plan: A detailed floor plan document is available — contact us for access to installation documentation.
Frequently Asked Questions
What is thermally modified wood and why is it used?
Thermally modified wood (ThermoWood) is lumber that has been treated using a controlled heat process — no chemicals are added. This process alters the wood's cellular structure, making it significantly more resistant to moisture absorption, decay, and dimensional changes caused by weather. It is a common material choice for outdoor sauna construction due to its durability and stability.
Does this sauna come with a heater?
The sauna is available in three configurations: without a heater, with a Harvia KIP 8.0kW heater in black, or with a Harvia KIP 8.0kW heater in silver. Select your preferred option at checkout. If you already own a compatible heater, the no-heater option allows you to use your existing unit.
What electrical requirements does the Harvia heater need?
The Harvia KIP 8.0kW heater requires a dedicated electrical circuit. Specific voltage and amperage requirements are detailed in the heater's documentation. All electrical work must be completed by a licensed electrician and must comply with local electrical codes.
Can this sauna be installed indoors?
Yes, indoor installation is possible provided the space has appropriate ventilation and suitable flooring to handle heat and humidity. We recommend consulting a qualified installer before proceeding with an indoor setup to ensure compliance with local building and safety requirements.
How long does shipping take?
Orders are packed and shipped within 1–3 business days. Delivery to most US addresses takes 5–10 business days. Shipping is free within the contiguous United States.
What does the 5-year structural guarantee cover?
The 5-year structural guarantee covers defects in the structural components of the sauna as delivered. Please refer to the warranty documentation included with your order for full terms, exclusions, and the claims process.
Is assembly required?
Yes, this product ships as a kit and requires assembly on-site. A floor plan and assembly documentation are available. Professional installation is recommended to ensure the structure is assembled correctly and safely.
The SAK25470 is a well-built, thoughtfully designed outdoor sauna that fits naturally into a home wellness routine. If you're ready to add a dedicated sauna space to your property, this kit offers a durable structure, flexible heater options, and free USA shipping — everything you need to get started. Select your configuration above and place your order today.
This product is intended for general wellness and relaxation purposes. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any health condition. Consult a qualified healthcare provider before use if you have any medical concerns.