SaunaLife Model S4N 6-Person Wood-Burning Natural Hot Tub

 

 

A naturally beautiful, off-grid soaking tub designed for effortless warmth, efficiency, and shared relaxation.

 

 

The SaunaLife SOAK-Series Model S4N delivers a refined wood-burning hot tub experience that blends natural materials, high-efficiency engineering, and timeless outdoor design.

 

Crafted from durable Thermo-Spruce in a natural finish, this fully assembled hot tub requires no electricity, making it an eco-friendly choice for backyards, cabins, and off-grid retreats. With space for up to six bathers, a contoured fiberglass interior, and rapid heat-up performance, the S4N invites you to slow down and enjoy the elemental ritual of fire-heated water—naturally.

 

 

 

Model	Model S4B
Material	Thermo-Spruce
Interior Dimensions	71" Diameter x 33"D
Exterior Dimensons	79" Diameter x 37"H
Water Capacity	304 Gallons
Product Weight when filled	3064 lbs
Stove Dimensions	19.8"L x 11.8"W x 13.1"H
Chimney Dimensions	95"H x 4.7" Diameter
Maximum Wood Length	16"
Maximum Temperature	106F
Shipping Dimensions	91"L x 46"W x 87"H
Shipping Weight	595 lbs

 

 

 

 

 

Model S4N Outdoor Wood-Burning Hot Tub   

 

 

• 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)
• 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) 

 

 

Includes:

 

 

 

Model S4N Outdoor Wood-Burning Hot Tub

  

• Fully assembled hot tub 
• Steps 
• Insulated cover  
• Drainage with tap 
• Polished stainless steel chimney 
• Chimney cap 

 

 

 

Interior Dimensions	71" Diameter x 33"D
Exterior Dimensons	79" Diameter x 37"H
Water Capacity	304 Gallons
Product Weight when filled	3064 lbs
Stove Dimensions	19.8"L x 11.8"W x 13.1"H
Chimney Dimensions	95"H x 4.7" Diameter

Shipping Dimensions	91"L x 46"W x 87"H
Shipping Weight	595 lbs

 

 

 

 

 

Wood-Fired Soaking, Reimagined

 

 

The S4N is powered entirely by wood, offering a grounding and intentional alternative to electric or gas systems.

 

 

• High-efficiency stainless steel wood-burning heater with dual heat compartments

• Rapid heat-up, bringing water to ideal soaking temperatures in about 1.5–2 hours

• No electrical connection required, ideal for sustainable and off-grid living

• Even, immersive warmth that surrounds the body naturally

 

 

This is soaking as it was meant to be—simple, powerful, and deeply restorative.

 

 

 

Designed for Comfort & Connection

 

 

Built for shared enjoyment, the S4N offers generous proportions and supportive ergonomics.

 

 

• Spacious interior comfortably accommodates up to six people

• Holds over 304 gallons of water for full-body immersion

• Thick, dark grey contoured fiberglass lining supports relaxed seating

• Smooth, easy-to-clean surface enhances comfort and durability

 

 

Whether it’s a quiet evening soak or a gathering with friends, the experience feels open and unhurried.

 

 

 

Engineered for Exceptional Efficiency

 

 

Crafted in Northern Europe, the S4N features an advanced heating system designed to outperform traditional wood-fired tubs.

 

 

• 304 stainless steel wood stove with a secondary heat chamber

• Transfers heat from smoke to water, reducing wood use by up to 50%

• Super-heated air channel between the fiberglass lining and wood exterior accelerates heating

• Intelligent water circulation draws cooler water from below and redistributes warm water evenly

 

 

The result: faster heat-up, less wood consumption, and consistent water temperature throughout the tub.

 

 

 

Built with Premium Outdoor Materials

 

 

The S4N’s exterior is crafted from Thermo-Spruce, a thermally modified wood ideal for wet, outdoor environments.

 

 

• Lasts up to 2X longer than Cedar

• Naturally resistant to moisture and weather

• Superior thermal resistance (R-value) helps retain heat longer

• Eco-friendly, stable, and beautifully finished in a natural tone

 

 

This material choice ensures long-term durability while showcasing the organic beauty of real wood.

 

 

 

Arrives Fully Assembled — Ready to Enjoy

 

 

The S4N is delivered fully assembled, allowing you to start soaking sooner with minimal setup.

 

 

Included features:

 

 

• Matching Thermo-Spruce wood steps for easy access

• Extra-thick insulated steel-reinforced foam cover, foldable for storage

• Marine-grade dark grey vinyl cover exterior

• Integrated drainage tap for simple water management

• Polished stainless steel chimney with protective cap

Everything you need for a seamless ownership experience is thoughtfully included.

 

 

 

A Natural Aesthetic for Outdoor Living

 

 

With its warm, natural wood finish and clean, timeless design, the S4N blends effortlessly into a wide range of outdoor settings—from modern landscapes to rustic retreats. It feels grounded, inviting, and intentionally crafted for outdoor life.

 

 

 

Northern European Craftsmanship, Naturally Heated Wellness

 

 

Designed by SaunaLife and handcrafted in Northern Europe—where wood-fired bathing traditions run deep—the S4N reflects generations of expertise in thermal design, materials, and outdoor wellness.

 

 

The result is a luxury wood-burning hot tub that delivers powerful performance with natural simplicity.

 

 

Heat with fire. Soak with intention. Live the SaunaLife.