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SaunaLife Model S4 Soak Series 6 Person Wood-Fired Hot Tub

Save $350.00 Save $350.00
Original price $6,990.00
Original price $6,990.00 - Original price $6,990.00
Original price $6,990.00
Current Price $6,640.00
$6,640.00 - $6,640.00
Current Price $6,640.00
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Why Choose the SaunaLife S4 Wood-Fired Hot Tub?

  • No complicated installation required.
  • Heats 3X faster than traditional wood-fired hot tubs.
  • No electricity required, reducing energy costs.
  • Thermo-Spruce lasts 2X longer than Cedar.
  • Ergonomic design with contoured fiberglass interior.
  • Easy-to-clean fiberglass lining & integrated drainage tap.

SaunaLife S4 Soak Series 6 Person Wood-Fired Hot Tub - Fully Assembled

A Luxurious, Eco-Friendly Outdoor Hot Tub with Unmatched Efficiency

SaunaLife S4 Wood-Fired Hot Tub - Fully Assembled

Experience the ultimate in outdoor relaxation with the SaunaLife S4 Wood-Fired Hot Tub. Designed for efficiency, comfort, and durability, this fully assembled hot tub provides a spacious, ergonomic soaking experience for up to 6 bathers.

Unlike traditional hot tubs, the S4 requires no electricity, making it an eco-friendly and cost-effective option for those seeking a pure, off-grid soaking experience. Engineered in Northern Europe, the S4’s advanced wood-burning heating system heats 304 gallons of water in just 1.5 to 2 hours, which is three times faster than traditional wood-fired hot tubs.

Its innovative dual-chamber stove design reduces wood consumption by up to 50%, while the air-heated insulation system ensures optimal heat retention. Built with 1.65” thick Thermo-Spruce, the S4’s exterior lasts twice as long as Cedar, offering superior weather resistance and durability.

Inside, the dark grey fiberglass lining provides a smooth, contoured surface for maximum comfort and easy maintenance. Complete with matching wooden steps, an insulated foam cover, and a stainless steel chimney, the S4 is a premium, low-maintenance hot tub built for long-lasting enjoyment.

Soak-Series Model S4 Features

  • 1.65” Thick Thermo-Spruce Exterior
    • Lasts up to 2X longer than Cedar for superior outdoor durability.
    • Naturally resistant to weather, moisture, and decay.
  • 304 Stainless Steel Wood-Burning Heater
    • Dual heat compartments for 50% more efficiency.
    • Self-cleaning corrugated stove reduces wood consumption.
  • Polished Stainless Steel Chimney with Protection Cap: Prevents heat loss and enhances heating efficiency.
  • Heats Water in Just 1.5 - 2 Hours: Warms 304 gallons from 40°F to 95°F in record time.
  • Eco-Friendly, No Electricity Required: Off-grid hot tub solution – perfect for cabins, retreats, and backyards.
  • Innovative Heat Circulation System
    • Super-heated air between the fiberglass lining and wood exterior accelerates heating.
    • Cooler water is drawn through a lower channel and redistributed through an upper channel for even temperature distribution.
  • Seats Up to 6 People: Perfect for social gatherings, family relaxation, or solo retreats.
  • Dark Grey Contoured Fiberglass Lining
    • Ergonomically shaped for superior bather comfort.
    • Easy to clean, non-porous surface for low maintenance.
  • Matching Thermo-Spruce Steps for Easy Access: Provides safe and convenient entry into the hot tub.
  • Extra Thick, Steel-Reinforced Foam Insulated Cover
    • Folds for easy removal and storage.
    • Dark grey marine-grade vinyl exterior for durability.
  • Integrated Hot Tub Drainage Tap: Allows for easy water management and cleaning.

Model S4 Wood-Fired Hot Tub Specifications

  • Capacity: Up to 6 bathers
  • Exterior Dimensions: 79” Diameter x 37” H
  • Interior Dimensions: 71” Diameter x 33” Deep
  • Weight: 595 lbs
  • Water Capacity: 304 Gallons
  • Material: Thermo-Spruce Exterior, Fiberglass Interior
  • Heating System: 304 Stainless Steel Wood-Burning Stove
  • Chimney: Polished Stainless Steel with Protective Cap

What’s Included?

  • Luxury Thermo-Spruce Hot Tub (Fully Assembled & Ready to Use)
  • 304 Stainless Steel Wood-Burning Heater
  • Polished Stainless Steel Chimney with Cap
  • Ergonomic Dark Grey Fiberglass Lining
  • Matching Thermo-Spruce Wooden Steps
  • Extra Thick, Insulated Foam Cover (Steel Reinforced, Foldable)
  • Integrated Drainage Tap for Easy Water Management

Downloads: 

Soak-Series Model S4

Elevate Your Backyard with the SaunaLife S4 – A Fully Assembled, Eco-Friendly, & Fast-Heating Wood-Fired Hot Tub for the Ultimate Relaxation Experience!

Order Processing: Once you place your order, you'll receive an order confirmation email. Please allow 1-3 business days for processing. If there are any unexpected delays, we’ll reach out to you immediately.

Shipping Methods:

  • Freight Shipping: Saunas ship in large, crated packages and will be delivered via freight. The carrier will schedule a delivery appointment when the shipment is in your area.
  • Ground Shipping: Sauna accessories, heaters, & components ship in standard FedEx or UPS packages.

Delivery Timeline:

  • Delivery Timeline:

    • Processing: Please allow 1-3 business days for us to process your order.
    • Handling Time: This product should ship out in 7-10 business days days from the time it is processed.
    • Transit Time: Once shipped, we will send you the tracking number. Freight shipments typically take 3-10 business days, depending on your location.
    • Delivery Appointment: The carrier will contact you to set a delivery time. Someone must be present to receive the delivery.

    Receiving Your Shipment: Inspect your shipment for damage before signing the delivery receipt. For any issues, mark “DAMAGED, NEEDS REVIEW,” take photos, and contact us within 2-3 business days.

Installation & Setup:

Saunas are typically very simple to put together. Some are as easy as clamping the 4 walls together.

Electrical Requirements:

  • Most infrared saunas **plug into a standard 120V home outlet**.
  • Traditional saunas may require a **240V hardwired connection**, which should be installed by a licensed electrician.

Professional Installation: If you require assistance with setup, we can refer you to our preferred installation partners.

Space Considerations: Ensure proper ventilation and clearance before installation. Saunas should be placed on a **level, dry surface** away from moisture-sensitive materials.

Contact Us: To connect with an installer in your area or get a price quote, please call us at 888-995-4450 or email us at info@selectfitnessusa.com.

Sauna Warranty Coverage:

Select Fitness is an authorized dealer for every sauna we sell. All saunas include the manufacturer's original warranty.

Typical warranty coverage includes:

  • Heating Elements & Electronics: Covered for years.
  • Wood Panels & Structure: Covered against defects but does not include natural expansion or contraction of wood.
  • Control Panel & Internal Components: -year warranty.

For specifics on your sauna’s warranty, check the product details or contact us for more information.

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Sauna FAQs

General Questions
What’s the difference between an infrared sauna, a traditional sauna, and a hybrid sauna? +
Infrared saunas: Heat your body directly with infrared light for deep tissue penetration. Lower temperatures (120–150°F) make it easier to stay in longer. Known for relaxation, recovery, and potential wellness benefits.

Traditional saunas: Heat the air with electric heaters or wood-burning stoves. Higher temperatures (160–195°F) provide an intense, sweat-heavy experience, boosting circulation and overall wellness. Zero EMF output.

Hybrid saunas: Offer the benefits of both. They use infrared waves for deeper tissue penetration alongside much higher heats from a traditional sauna stove.
How do I choose the right sauna for me? +
Consider:
Person Capacity: How many people will use the sauna? A larger capacity sauna provides more space but takes up more room.
Indoor vs. Outdoor Use: Indoor saunas cannot be safely used outdoors. Choose the right option for your space.
Heating Style: Infrared, Traditional, or Hybrid.
Full Spectrum vs. Standard Infrared: Full Spectrum saunas provide near, mid, and far infrared. This is a desirable but generally more expensive feature.
EMF Levels: Low (<6–10 MG), Ultra Low (<3–5 MG), or Near Zero (<2 MG). Lower EMF is generally better, but more expensive.
What size saunas do you offer? +
We carry 1-person, 2-person, and up to 6-person+ models. Consider both interior comfort and available space when selecting a size.
Shipping & Delivery
How is my sauna shipped? +
Saunas ship via freight in large, crated boxes. A delivery appointment will be scheduled before arrival.
How much does shipping cost? +
We cover the shipping charge on all saunas. The price you see online includes FREE shipping!
Installation & Setup
Do saunas require professional installation? +
Infrared saunas: No, most models are plug-and-play and can be assembled in 1-2 hours.
Traditional saunas: Most are simple to set up but may require hardwiring by a licensed electrician.
What are the electrical requirements? +
1-2 person infrared saunas: Standard 120V outlet (some exclusions apply—check product details).
Larger infrared saunas & traditional saunas: Many will require a dedicated 240V wiring (professional installation highly recommended).
How long does it take to assemble a sauna? +
Most saunas take 30 minutes to 3 hours with two people and come with easy-to-follow instructions.
Usage & Maintenance
How long does it take to heat up? +
Infrared saunas: 10-15 minutes on average but depends on the model and number of heaters.
Traditional saunas: 30-45 minutes on average but depends on the model and number of heaters.
How do I clean my sauna? +
Wipe down with a damp cloth after each use.
For deep cleaning, use a vinegar-water mix—avoid harsh chemicals.
Specialty wood cleaner and treatment is advisable.
What type of wood is best for a sauna? +
Canadian Hemlock: Durable, affordable, and commonly used in infrared saunas.
Red Cedar: Premium, naturally rot-resistant, aromatic, and highly durable.
Basswood, Mahogany, and Fir: Alternative high-quality woods with varying aesthetics and insulation properties.
Warranty & Support
What is the warranty on my sauna? +
Every sauna includes a manufacturer’s warranty covering everything from the wood to the heaters and more. For specific warranty information, check the product details.
What if my sauna arrives damaged? +
Inspect your sauna upon delivery and note any damage before signing the receipt.
Contact us within 48 hours to start a claim.
Your sauna will be either serviced or replaced.
Who do I contact for warranty support? +
Contact info@selectfitnessusa.com or call 888-995-4450.
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“From the first consultation to delivery, Select Fitness made buying my sauna a seamless experience. The team answered all my questions, and now I get to enjoy the best part of my day—relaxing in my new infrared sauna.”

- Jordan W., 02/25
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