SaunaLife Model S4B – Soak-Series Outdoor Wood-Fired Hot Tub (Black, Up to 6 Persons)

Experience the elemental balance of fire, water, and craftsmanship with the SaunaLife Model S4B, part of the premium Soak-Series collection.
Designed for up to six people, this luxury wood-fired hot tub merges Scandinavian engineering with eco-conscious simplicity — no electricity required.

Built from Thermo-Spruce, a material proven to last up to twice as long as cedar, the S4B features a thick, contoured dark grey fiberglass interior that cradles the body in ergonomic comfort. The exterior showcases a sleek black finish that blends beautifully into natural or modern outdoor spaces.

Powered by a 304 stainless steel wood-burning heater with dual heat chambers, the Model S4B delivers rapid, even heating — reaching ideal soaking temperatures in under two hours.
Its secondary combustion system maximizes efficiency, reducing wood usage by up to 50% compared to traditional wood-fired hot tubs.

From setup to serenity, the Model S4B arrives fully assembled, requiring no electrical hookup. Simply fill, ignite, and relax as heat and nature intertwine in a restorative open-air ritual.

• Fully Off-Grid Design: No electricity required — powered entirely by clean-burning wood.

• Thermo-Spruce Craftsmanship: Outlasts cedar up to 2×, offering superior weather and thermal resistance.

• Premium Comfort: Ergonomic, contoured fiberglass interior supports the body for longer, more relaxing soaks.

• Rapid Heat-Up Time: Warms 304 gallons to perfect temperature in just 1.5–2 hours.

• High-Efficiency Heater: 304 stainless steel construction with dual heat chambers and self-cleaning corrugated design.

• Superior Heat Retention: Air insulation between wood and fiberglass accelerates heating and maintains water temperature.

• Eco-Conscious Luxury: Minimal wood consumption and no electrical demand make it the sustainable choice for home wellness.

• Handcrafted in Northern Europe: Built by skilled artisans for exceptional longevity and performance.

• Includes Insulated Cover & Steps: Easy entry, superior heat retention, and elegant protection when not in use.

• Perfect for Entertaining: Comfortably accommodates up to six bathers for shared rejuvenation.

• Fully Assembled SaunaLife Model S4B Hot Tub

• 304 Stainless Steel Wood-Burning Heater

• Polished Stainless Steel Chimney & Cap

• Thermo-Spruce Steps

• Extra-Thick Foam-Insulated Cover (Dark Grey Marine Vinyl Exterior)

• Integrated Drainage Tap

• User Manual & Care Guide

• 2-Year Limited Warranty (Consumer Use)

This product ships via freight carrier (LTL) throughout the contiguous United States. Shipping costs are calculated at checkout based on your selected product.

Freight delivery is curbside only — the carrier will lower your shipment to the ground at the end of your driveway or curb. You are responsible for moving the product to its final installation location.

A delivery appointment will be scheduled in advance. Please inspect your shipment carefully before signing the delivery receipt and note any visible damage on the Bill of Lading at time of delivery.

For deliveries to Alaska, Hawaii, or Puerto Rico, please contact us prior to ordering for a freight quote.

Manual Links:

• SaunaLife Warranty

• SaunaLife S4B Installation Manual

• SaunaLife s4 Dimensions Diagram