The Thermora Eterna is a four-person outdoor infrared sauna built for households that want a shared wellness space without compromising on build quality or features. Constructed from carbonized wood-plastic composite — a material that combines the appearance of natural wood with the durability of food-grade plastic — this sauna is engineered to resist warping, cracking, moisture, mold, and insects over a service life rated at 10-plus years. Six carbon crystal heating panels deliver even, 360-degree infrared warmth, while integrated chromotherapy lighting and Bluetooth speakers round out the experience.
Why Customers Choose This Sauna
- Seats up to four people — suitable for family or shared use
- Carbonized composite construction rated for 10+ years of outdoor service
- Six carbon crystal infrared panels with low EMF output
- 360-degree surround heating for even warmth throughout the cabin
- Gambrel (hillside) roof design for effective rain and snow drainage
- 7-color chromotherapy LED lighting with built-in control panel
- Integrated Bluetooth stereo speakers and eye-care reading light
- 2-year full warranty; 5-year warranty on carbon crystal heating panels
- Free shipping within the contiguous United States
Product Highlights
Carbonized Wood-Plastic Composite Construction
The cabin is built from a carbonized composite material that combines the natural texture of wood with the structural resilience of food-grade plastic. This construction resists warping, cracking, moisture absorption, mold growth, and insect damage — making it a practical choice for permanent outdoor installation.
Six Carbon Crystal Infrared Heating Panels
Six carbon crystal panels are positioned to provide 360-degree surround infrared heat throughout the cabin. The system operates at 1750W on a standard 120V/60Hz circuit and is designed for low EMF output.
Gambrel Roof Design
The classic gambrel (hillside) roof profile is engineered for effective drainage of rain and snow, reducing standing water and extending the life of the exterior finish across a wide range of climates.
7-Color Chromotherapy Lighting
The built-in control panel lets you cycle through seven LED color options, allowing you to customize the ambiance of each session. Chromotherapy lighting is a standard feature in professional spa environments.
Bluetooth Stereo Speakers
Integrated Bluetooth speakers connect wirelessly to your device so you can listen to music, podcasts, or guided audio during your session without additional equipment.
Eye-Care Reading Light
A dedicated reading light is included for use during lower-intensity sessions, adding a practical convenience feature for those who prefer to read or relax with ambient lighting.
Extended Warranty Coverage
The Thermora Eterna includes a 2-year full warranty and a 5-year warranty specifically covering the carbon crystal heating panels — one of the more comprehensive warranty packages available in this product category.
Specifications
- Capacity: 4 persons
- Construction Material: Carbonized wood-plastic composite
- Rated Service Life: 10+ years
- Heating Technology: Carbon crystal far-infrared panels
- Number of Heating Panels: 6
- EMF Rating: Low EMF
- Power Output: 1750W
- Electrical: 120V / 60Hz
- Interior Dimensions: 39.4 x 33.5 x 71.7 inches
- Roof Style: Gambrel (hillside)
- Lighting: 7-color chromotherapy LED + eye-care reading light
- Audio: Integrated Bluetooth stereo speakers
- Warranty: 2-year full warranty; 5-year warranty on carbon crystal panels
- SKU: SAK70182
- Shipping: Free within the contiguous United States; ships within 1–3 business days; estimated delivery 5–10 business days
Ideal For
- Households looking for a shared outdoor sauna that accommodates multiple users at once
- Homeowners who want a permanent outdoor installation with long-term durability
- Those prioritizing low-EMF infrared technology in a larger-capacity sauna
- Buyers seeking an extended warranty on heating components for added peace of mind
Important Information
- Installation Surface: This sauna requires a flat, stable, level surface such as a concrete pad, deck, or patio. It is designed for outdoor use only and should not be installed indoors.
- Electrical Requirements: The sauna operates on a standard 120V/60Hz circuit at 1750W. A dedicated circuit is recommended. Consult a licensed electrician before installation to confirm compliance with local electrical codes.
- Weather Protection: While the carbonized composite construction is designed for outdoor durability, using a weatherproof cover when the sauna is not in use is recommended to preserve the exterior finish.
- Local Permits: Building permit requirements vary by municipality and HOA. Check with your local building department before installation to determine whether a permit is required in your area.
- Warranty Terms: The 2-year full warranty and 5-year panel warranty cover manufacturing defects. Coverage does not extend to damage caused by improper installation, misuse, or conditions outside the product's rated specifications.
Frequently Asked Questions
How many people does this sauna fit?
The Thermora Eterna is designed for up to four people. The interior dimensions are 39.4 x 33.5 x 71.7 inches, providing comfortable space for shared use.
What makes carbonized composite different from standard wood?
Carbonized wood-plastic composite combines the natural appearance of wood with the structural properties of food-grade plastic. The result is a material that resists warping, cracking, moisture, mold, and insects more effectively than untreated wood, with a rated service life of 10+ years.
What electrical connection does this sauna require?
The sauna operates on a standard 120V/60Hz circuit at 1750W. We recommend a dedicated circuit and suggest consulting a licensed electrician before installation to ensure compliance with local codes.
What is the EMF level of the heating panels?
The six carbon crystal infrared panels are designed for low EMF output. Specific EMF measurements are included in the product documentation provided with your order.
How long does shipping take?
This sauna ships free within the contiguous United States. Orders are processed and shipped within 1–3 business days, with estimated delivery in 5–10 business days. Tracking information is provided once your order ships.
What does the warranty cover?
The Thermora Eterna includes a 2-year full warranty covering defects in materials and workmanship, plus a 5-year warranty specifically on the carbon crystal heating panels. Warranty coverage does not apply to damage from improper installation or misuse.
Do I need a permit to install this sauna?
Permit requirements vary by location. We recommend checking with your local building department or HOA before installation to determine whether a permit is required in your jurisdiction.
Can this sauna be used in cold or snowy climates?
Yes. The gambrel roof is designed for effective rain and snow drainage, and the carbonized composite construction is built to withstand a wide range of outdoor weather conditions.
The Thermora Eterna is a durable, well-specified four-person outdoor infrared sauna backed by one of the stronger warranty packages in its category. Free US shipping and a straightforward assembly process make it a practical choice for homeowners ready to add a dedicated outdoor wellness space. If you have questions before purchasing, our team is here to help.
This product is not intended to diagnose, treat, cure, or prevent any disease or medical condition. Consult your healthcare provider before use if you have any health concerns or pre-existing conditions.