SaunaLife Model S4 Wood-Fired Hot Tub

Elevate your outdoor wellness routine with the SaunaLife Model S4, the pinnacle of wood-burning hot tub quality, efficiency, and luxury. Designed for those who seek an authentic, eco-friendly soaking experience without the need for an electrical connection, the S4 represents the best in Northern European engineering. This super-efficient hot tub heats in a fraction of the time required by traditional models, providing a spacious and ergonomically contoured sanctuary for up to 6 people.

Arriving fully assembled and ready for immediate enjoyment, the Model S4 is the ultimate centerpiece for your backyard oasis.

Unrivaled Heating Efficiency & Performance

At the heart of the Model S4 is an ingenious, self-cleaning corrugated stove. Featuring a secondary combustion chamber that extracts heat from the smoke, this system reduces wood consumption by up to 50% compared to other wood-fired tubs. The S4 is the fastest-heating wood-burning hot tub on the market, capable of heating 304 gallons of water from 40°F to 95°F in just 1.5 to 2 hours. The unique design super-heats the air between the fiberglass lining and the wood exterior to further accelerate the process.

Superior Thermo-Spruce Construction

The exterior of the S4 is crafted from premium Thermo-Spruce, an organic heat-and-steam treatment that enhances the wood's stability and decay resistance. This chemical-free modification ensures the tub surround lasts up to twice as long as traditional cedar. The wood is painted a sleek black, providing a modern aesthetic that complements the thick, dark grey contoured fiberglass interior. Thermo-Spruce also offers superior thermal resistance (R-value), ensuring the water stays hot for longer.

Ergonomic Design & Easy Maintenance

The Model S4 is designed for maximum bather comfort and hygiene. The contoured fiberglass lining provides a smooth, ergonomic seating surface for up to six people, making it a comfortable place for social gatherings or personal relaxation. Unlike traditional all-wood tubs, the fiberglass interior is incredibly easy to clean and maintain. An integrated drainage tap allows for quick water elimination, and the included insulated cover ensures the tub stays clean and retains heat between sessions.

Features

• Spacious 6-Person Capacity: Ideal for family gatherings or hot tub parties.

• Rapid Response Heating: Reaches ideal temperatures in under 2 hours.

• Eco-Friendly Operation: No electricity required; wood-burning efficiency.

• 304 Stainless Steel Heater: Durable, dual-compartment stove for maximum performance.

• Thermo-Spruce Surround: Lasts up to 2x longer than cedar; superior R-value.

• Insulated Foam Cover: Extra thick, steel-reinforced cover with marine-grade vinyl exterior.

• Polished Stainless Steel Chimney: Includes protection and a chimney cap for safety.

• Fully Assembled Delivery: Arrives ready to set up and enjoy.

Specifications

• Capacity: 5 to 6 Bathers.

• Interior Dimensions: 71" Diameter x 33" D.

• Exterior Dimensions: 79" Diameter x 37" H.

• Water Capacity: 304 Gallons.

• Material: Thermo-Spruce Surround (Black) / Grey Fiberglass Interior.

• Stove Material: 304 Stainless Steel.

• Chimney Height: 95".

• Maximum Temperature: 106°F.

• Product Weight: 595 lbs (Empty) / 3,064 lbs (Filled).

• Shipping Weight: 595 lbs.

Kit Includes

• (1) Fully Assembled SaunaLife Model S4 Hot Tub

• (1) Matching Thermo-Spruce Wood Steps

• (1) Insulated Folding Cover (Dark Grey Vinyl)

• (1) 304 Stainless Steel Wood-Burning Stove

• (1) Polished Stainless Steel Chimney & Cap

• (1) Integrated Drainage Tap

• (1) Installation and Operation Manual