SaunaLife Model S4N

Luxury Outdoor Wood-Burning Hot Tub

The SaunaLife SOAK-Series Model S4N combines Scandinavian craftsmanship, efficiency, and style to deliver one of the finest wood-fired hot tubs available. Designed for up to six people, it creates the perfect setting to relax, connect, and unwind in your own backyard oasis.

Ready to Use, Easy to Enjoy

The Model S4N arrives fully assembled for a quick and simple setup. Its ergonomically contoured fiberglass interior provides lasting comfort, while the smooth surface is easy to clean. The exterior is finished in thermally enhanced spruce, offering exceptional durability and resistance to the elements.

Engineered for Efficiency & Performance

Crafted in Northern Europe, the S4N heats water up to three times faster than traditional wood-fired hot tubs—no electricity required. At its core is a self-cleaning corrugated stove with a secondary chamber that captures heat from smoke, reducing wood use by up to 50%. Heat circulation between the fiberglass lining and spruce exterior further accelerates the process, while a smart channel system keeps water evenly heated throughout the tub.

Fast Heating for More Relaxation

The highly efficient wood stove can heat 304 gallons of water from 40°F to 95°F in just 1.5 to 2 hours, making it the fastest-heating wood-burning hot tub in its class.

A Backyard Retreat Built for Wellness

Blending natural materials, thoughtful design, and advanced engineering, the SaunaLife S4N transforms your backyard into a private spa—perfect for everyday relaxation or entertaining with family and friends.

Includes

Model S4N Outdoor Wood-Burning Hot Tub  

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

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)  

Technical Specifications

• Model: S4N
• Material: Thermo-Spruce
• Interior Dimensions: 71" Diameter × 33" D
• Exterior Dimensions: 79" Diameter × 37" H
• Water Capacity: 304 gallons
• Product Weight (filled): 3,064 lbs
• Stove Dimensions: 19.8" L × 11.8" W × 13.1" H
• Chimney Dimensions: 95" H × 0.7" Diameter
• Maximum Wood Length: 16"
• Maximum Temperature: 106°F
• Shipping Dimensions: 91" L × 46" W × 87" H
• Shipping Weight: 595 lbs

Installation Manual

S4N Diagram

S4N Warranty