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SaunaLife Model S4 Wood-Fired Hot Tub

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Authorized SaunaLife Dealer
Manufacturer's Warranty Included

SKU: SL-MODELS4
Sale price$5,990.00

SaunaLife Model S4 Wood-Fired Hot Tub
SaunaLife Model S4 Wood-Fired Hot Tub Sale price$5,990.00

Model S4 Outdoor Wood-Burning Hot Tub

The SaunaLife SOAK-Series Model S4 represents the very best in wood-burning hot tub quality, efficiency, and luxury. Plus, you'll enjoy a top-of-the-line experience with a combination of exceptional quality, efficiency, and luxury that only the SaunaLife SOAK-Series Model S4 can provide.

Ready for your hot tub party 

The Model S4 wood-fired hot tub arrives completely assembled and is easy to set up. Its ergonomically shaped fiberglass tub is a comfortable place for up to 6 people. The interior surface is easy to clean, and the exterior is crafted from thermally enhanced spruce for superior weather resistance and durability.

Engineered for efficiency and performance

Engineered and crafted in the Northers Europe, this super-efficient hot tub heats in 1/3 of the time as traditional wood-fired hot tubs. No electrical connection is required. At the heart of the Model S4 is its ingenious self-cleaning corrugated stove with a secondary chamber that transfers heat from the smoke – reducing wood consumption up to 50% compared with other hot tubs. Brilliantly, the air between the fiberglass lining and the wood exterior is super-heated to accelerate the heating process. The stove is cleverly engineered to draw cooler water through a lower channel and redistribute it though an upper channel to equalize the temperature.

Start enjoying sooner

This incredibly efficient wood stove will heat 304 gallons of water from 40°F (5°C) to 95°F (35°C) in 1.5 to 2 hours – the fastest-heating wood burning hot tub available.

Relax with friends and family the luxury of your Model S4 backyard wood-burning hot tub from SaunaLife.

Features

  • Thermo-Spruce materials (lasts up to 2X longer than Cedar)
  • Luxury outdoor wood-burning hot tub
  • Designed for outdoor ergonomic hot tub bathing experiences
  • Arrives fully assembled and no electricity required (eco-friendly)
  • Spacious interior holds over 304 gallons of pure water bathing pleasure
  • Thick dark grey contoured fiberglass lining provides enhanced bather comfort
  • Stainless steel wood-burning heater utilizes dual heat compartments for unmatched efficiency
  • Rapid response heat-up time prepares water to ideal temperatures in under 2-hours
  • Wood-burning heater constructed of 304 stainless steel
  • Polished stainless steel chimney with protection
  • Durable Thermo-Spruce tub surround (1.65” thick), painted black
  • Superior thermal resistance (R-value) to retain heat
  • Matching Thermo-Spruce wood steps for easy access
  • Extra thick steel reinforced foam cover, folds for ease of removal and storage 
  • Dark grey marine grade vinyl cover exterior 
  • Integrated hot tub drainage tap 
  • Up to 6 bathers 
  • Exterior dimensions – 79" diameter and 37” high 
  • Interior dimensions – 71" diameter and 33” deep 
  • Designed by SaunaLife and handcrafted in Northern Europe 
  • Thermo-Spruce Material Advantages
  • Lasts up to 2X longer than Cedar 
  • Superior thermal resistance (R-value) 
  • Eco-friendly 
  • Ideal for water use (stable)

Specifications

  • Weight: 595 lbs
  • Width / Depth: 79"D
  • Height: 37"H
  • Fully assembled hot tub, Steps, Insulated cover, Drainage with tap, Polished stainless steel chimney, Chimney cap

Resources

PREMIUM HANDCRAFTED SAUNAS!

Exquisite craftsmanship, seamless installation, and unmatched quality.

PRICE MATCH GUARANTEE

We offer the lowest prices guaranteed. Find the same product that is priced lower, we will price match or price beat that offer

FULL WARRANTY INCLUDED

As an authorized dealer for all our brands, we ensure you receive the original manufacturer's warranty.

EXCELLENT CUSTOMER SERVICE

Questions? Our team is here to help you with any questions about your product. Call today (833) 366 4681 or email, chat with us

Imagine Feeling Well-Rested, Energized, Stress Relief and Mental Clarity In Under 20 Minutes A Day

Perfect for biohackers, wellness professionals, and athletes, experience stress relief, muscle recovery, and mental clarity with every session.

Enhance detoxification, improve circulation, and boost immunity

Health Optimization

Cardiovascular Health: Regular sauna sessions can significantly reduce the risk of cardiovascular events. Individuals who use the sauna four to seven times per week are 50% less likely to die from cardiovascular-related causes compared to those who use it once a week.

Stress Reduction: Regular sauna use can decrease cortisol levels, the body's primary stress hormone

Handcrafted with the finest materials for a superior experience

Luxury Craftsmanship

Mood Enhancement: Heat exposure from sauna use triggers the release of endorphins and dynorphins, leading to improved mood and a sense of well-being

Growth Hormone Release: Engaging in sauna protocols can lead to a dramatic increase in growth hormone levels, which are essential for muscle repair and growth.

Integrating cutting-edge features for personalized wellness

Advanced Technology

Detoxification: Regular sauna sessions can aid in the elimination of heavy metals and toxins through sweat, promoting overall detoxification.

Immune System Support: Sauna use can enhance the activity of the innate immune system.

Longevity: Frequent sauna bathing is associated with reduced all-cause mortality.

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Frequently Asked Questions

IS PREMIUM THERMAL THERAPY WORTH THE INVESTMENT?

Absolutely. While standard wellness products deliver marginal improvements, premium thermal therapy is an investment in your biological optimization system. Our clients report an average 42% improvement in recovery time, 67% reduction in chronic pain symptoms, and 3.5x better sleep quality after implementing their thermal therapy routine. Consider this: the average American spends $4,300+ annually on ineffective wellness products, temporary spa visits, and pain medications—while getting minimal long-term benefits. Premium thermal therapy delivers clinical-grade results in your home for decades, making it the most cost-effective wellness investment when measured by actual health outcomes per dollar spent.

I'VE TRIED WELLNESS PRODUCTS BEFORE AND WAS DISAPPOINTED. WHY WOULD THIS BE DIFFERENT?

Most wellness products fail because they address symptoms, not systems. Premium thermal therapy works at the biological level by triggering your body's innate adaptive responses—something no supplement, cream, or gadget can replicate.
The scientific validation is undeniable: over 340 peer-reviewed studies confirm that proper thermal conditioning improves cardiovascular function, accelerates muscle recovery, enhances cognitive performance, and extends healthspan. That's why elite athletes, longevity researchers, and health-optimizing executives have implemented these protocols as non-negotiable elements of their daily routines.
Unlike temporary wellness trends, thermal therapy's effectiveness has been documented for centuries across diverse cultures—from Finnish saunas to Japanese ice immersion—and is now enhanced by modern precision engineering.

HOW MUCH SPACE AND MAINTENANCE DO THESE SYSTEMS REQUIRE?

Choosing the right sauna depends on several factors:
Space Availability: Consider the available space in your home and choose a sauna with appropriate dimensions.
Number of Users: Think about how many people you plan to use the sauna regularly.
Budget: Saunas King offers a range of saunas at various price points.
Desired Features: Do you prioritize specific features like chromatherapy lighting, a sound system, or different wood finishes?
Personal Preferences: Explore our collection and choose a sauna that complements your style and décor.

Our knowledgeable team is happy to answer your questions and guide you towards the perfect sauna for your needs.
As for maintenance, we've engineered these systems for busy professionals. Unlike traditional saunas or cold plunges that demand hours of weekly upkeep, our advanced filtration and self-cleaning technologies reduce maintenance to just 5-10 minutes monthly.

HOW DOES PREMIUM THERMAL THERAPY DIFFER FROM STANDARD SAUNAS OR ICE BATHS?

The difference is precision engineering and medical-grade results. Standard saunas use basic heating elements that miss the therapeutic infrared spectrum required for cellular rejuvenation. Similarly, makeshift cold plunges lack temperature stability, which can reduce benefits by up to 80%. Our premium thermal therapy systems deliver:

Precisely calibrated temperatures that activate specific longevity pathways
Medical-grade materials free from harmful VOCs and EMFs
Advanced filtration systems that eliminate contamination risks
Smart monitoring technology that maintains optimal therapeutic conditions
Ergonomic designs that enhance comfort for extended sessions

This isn't about luxury—it's about transforming your biological response through scientifically validated parameters that standard systems simply cannot achieve.

IS THERMAL THERAPY SAFE FOR EVERYONE?

Safety is our foremost priority. While thermal therapy offers transformative benefits for most individuals, we recognize everyone's physiology is unique. That's why each purchase includes a complimentary consultation with our wellness specialists to develop a personalized protocol optimized for your specific health profile.
Our systems incorporate multiple safety features including automatic shutdown protections, antimicrobial surfaces, and real-time monitoring. For those with specific health concerns, we provide detailed clinical guidance and can coordinate with your healthcare provider to create an appropriate thermal conditioning program.
It's worth noting that thermal therapy's adaptogenic properties make it exceptionally well-tolerated across diverse age groups and health profiles when implemented with proper protocols—which is precisely what our expert team ensures for every client.

WHY SHOULD I INVEST IN A SAUNA OVER OTHER WELLNESS PRODUCTS?

Unlike supplements or therapies that offer short-term results, a sauna delivers proven, long-term health benefits with every use.

WHAT KIND OF RESULTS CAN I REALISTICALLY EXPECT?

Rather than making sweeping claims, let me share what our clients consistently report after implementing regular thermal therapy:

Within 1-2 weeks: Improved sleep quality (falling asleep 15-20 minutes faster, 28% reduction in night wakings), noticeably enhanced recovery from workouts, and significant stress reduction
Within 1 month: 30-40% reduction in chronic pain symptoms, improved skin appearance, enhanced mental clarity, and measurable improvements in heart rate variability (a key marker of biological resilience)
Within 3-6 months: Normalized blood pressure (average reduction of 8-12 points systolic in those with elevated BP), improved metabolic markers, enhanced immune function, and measurable improvements in inflammatory biomarkers

These results aren't marketing promises, they're documented outcomes from thousands of clients who've implemented our thermal conditioning protocols exactly as you will.
The question isn't whether premium thermal therapy works. The science is clear. The question is: how much longer will you wait to experience these benefits for yourself?

Model S4 Outdoor Wood-Burning Hot Tub

The SaunaLife SOAK-Series Model S4 represents the very best in wood-burning hot tub quality, efficiency, and luxury. Plus, you'll enjoy a top-of-the-line experience with a combination of exceptional quality, efficiency, and luxury that only the SaunaLife SOAK-Series Model S4 can provide.

Ready for your hot tub party 

The Model S4 wood-fired hot tub arrives completely assembled and is easy to set up. Its ergonomically shaped fiberglass tub is a comfortable place for up to 6 people. The interior surface is easy to clean, and the exterior is crafted from thermally enhanced spruce for superior weather resistance and durability.

Engineered for efficiency and performance

Engineered and crafted in the Northers Europe, this super-efficient hot tub heats in 1/3 of the time as traditional wood-fired hot tubs. No electrical connection is required. At the heart of the Model S4 is its ingenious self-cleaning corrugated stove with a secondary chamber that transfers heat from the smoke – reducing wood consumption up to 50% compared with other hot tubs. Brilliantly, the air between the fiberglass lining and the wood exterior is super-heated to accelerate the heating process. The stove is cleverly engineered to draw cooler water through a lower channel and redistribute it though an upper channel to equalize the temperature.

Start enjoying sooner

This incredibly efficient wood stove will heat 304 gallons of water from 40°F (5°C) to 95°F (35°C) in 1.5 to 2 hours – the fastest-heating wood burning hot tub available.

Relax with friends and family the luxury of your Model S4 backyard wood-burning hot tub from SaunaLife.

Features

  • Thermo-Spruce materials (lasts up to 2X longer than Cedar)
  • Luxury outdoor wood-burning hot tub
  • Designed for outdoor ergonomic hot tub bathing experiences
  • Arrives fully assembled and no electricity required (eco-friendly)
  • Spacious interior holds over 304 gallons of pure water bathing pleasure
  • Thick dark grey contoured fiberglass lining provides enhanced bather comfort
  • Stainless steel wood-burning heater utilizes dual heat compartments for unmatched efficiency
  • Rapid response heat-up time prepares water to ideal temperatures in under 2-hours
  • Wood-burning heater constructed of 304 stainless steel
  • Polished stainless steel chimney with protection
  • Durable Thermo-Spruce tub surround (1.65” thick), painted black
  • Superior thermal resistance (R-value) to retain heat
  • Matching Thermo-Spruce wood steps for easy access
  • Extra thick steel reinforced foam cover, folds for ease of removal and storage 
  • Dark grey marine grade vinyl cover exterior 
  • Integrated hot tub drainage tap 
  • Up to 6 bathers 
  • Exterior dimensions – 79" diameter and 37” high 
  • Interior dimensions – 71" diameter and 33” deep 
  • Designed by SaunaLife and handcrafted in Northern Europe 
  • Thermo-Spruce Material Advantages
  • Lasts up to 2X longer than Cedar 
  • Superior thermal resistance (R-value) 
  • Eco-friendly 
  • Ideal for water use (stable)

Specifications

  • Weight: 595 lbs
  • Width / Depth: 79"D
  • Height: 37"H
  • Fully assembled hot tub, Steps, Insulated cover, Drainage with tap, Polished stainless steel chimney, Chimney cap

Resources