The SaunaLife SOAK-Series Model S4B represents the very best in wood-burning hot tub quality, efficiency, and luxury. Designed and handcrafted in Northern Europe, this premium outdoor hot tub delivers a powerful combination of performance, durability, and comfort for year-round relaxation.

Ready for Your Hot Tub Party

The Model S4B wood-fired hot tub arrives fully assembled and is easy to set up, so you can start enjoying it immediately. Its ergonomically shaped fiberglass tub provides a comfortable soaking space for up to 6 people. The smooth interior surface is easy to clean and maintain, while the exterior is crafted from black Thermo-Spruce wood, offering superior weather resistance, strength, and long-term durability in outdoor environments.

Engineered for Efficiency and Performance

Engineered for high performance, this advanced hot tub heats up to one-third faster than traditional wood-fired models. No electrical connection is required, making it ideal for eco-friendly and off-grid use. At its core is a self-cleaning corrugated stove with a secondary heat chamber that transfers heat from smoke, reducing wood consumption by up to 50 percent. The design also superheats the air between the fiberglass lining and wood exterior to accelerate heating. The stove system draws cooler water through a lower channel and redistributes heated water through an upper channel for balanced temperature.

Start Enjoying Sooner

This high-efficiency wood-burning system heats 304 gallons of water from 40°F to 95°F in just 1.5 to 2 hours. Spend less time waiting and more time relaxing with friends and family in a luxury outdoor soaking experience.

Features: Model S4B Outdoor Wood-Burning Hot Tub

• Thermo-Spruce materials last up to 2X longer than cedar
• Luxury outdoor wood-burning hot tub
• Ergonomic design for comfortable soaking
• Fully assembled with no electricity required
• 304-gallon water capacity
• Thick dark grey contoured fiberglass lining
• 304 stainless steel heater with dual heat chambers
• Fast heat-up time under 2 hours
• Polished stainless steel chimney with protection
• 1.65-inch thick black Thermo-Spruce exterior
• High thermal resistance for better heat retention
• Matching Thermo-Spruce steps for easy access
• Extra-thick insulated foldable cover
• Marine-grade vinyl cover exterior
• Integrated drainage tap
• Fits up to 6 bathers
• 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 and sustainable
• Stable and ideal for water exposure

Includes: Model S4B Outdoor Wood-Burning Hot Tub

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

Specification: Model

Model: S4B
Material: Black Thermo-Spruce

Interior Dimensions:
71" diameter (180.3 cm) x 33" height (83.8 cm)

Exterior Dimensions:
79" diameter (200.7 cm) x 37" height (94 cm)

Water Capacity:
304 gallons

Product Weight (filled):
3064 lbs (1389.8 kg)

Stove Dimensions:
19.8"W x 11.8"D x 13.1"H

Chimney Dimensions:
0.7" diameter x 95" height

Maximum Wood Length:
16 inches (40.6 cm)

Maximum Temperature:
106°F (41.1°C)

Shipping Dimensions:
91"L x 46"W x 87"H

Shipping Weight:
595 lbs (269.9 kg)