SaunaLife S4B Wood-Fired Hot Tub | 6-Person Off-Grid Outdoor Soaking Tub, Black
Monday–Saturday, 9am–5pm PT
- Authorized Retailer of SaunaLife
- Full Manufacturer Warranty Included
- Financing Options Available
- U.S.-Based Customer Support
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LTL freight shipping: $950.00 to the contiguous U.S.
- In-stock orders typically ship within 4–7 business days
6-Person | Off-Grid Wood-Burning | Black Thermo-Spruce Exterior | Delivered Fully Assembled
All the off-grid power of the S4N — with a bold black Thermo-Spruce exterior that makes a statement in any backyard. The SaunaLife SOAK-Series Model S4B is a fully assembled, wood-fired outdoor hot tub with a 304-gallon capacity and room for up to six bathers. No electricity, no plumbing contractor, no waiting — just fill it, fire it, and soak.
The thermally modified Thermo-Spruce exterior is built to weather beautifully outdoors, while the smooth fiberglass interior keeps maintenance simple year-round. The S4B arrives fully assembled — no kit building required.
- S4N: Natural Thermo-Spruce finish — warm, classic wood aesthetic
- S4B: Black Thermo-Spruce finish — modern, bold outdoor look
SaunaLife S4B Product Video
Watch the product video for an overview of the SaunaLife SOAK-Series Model S4B wood-fired outdoor hot tub.
Who This Is For
The S4B is ideal for homeowners who want a premium off-grid outdoor soaking experience with a modern black aesthetic. It's a natural fit alongside a sauna, cold plunge, or as a standalone backyard wellness centerpiece for those who prefer a darker, more contemporary look.
Why Choose the SaunaLife S4B
- Fully off-grid — no electrical connection required
- Integrated stainless steel wood-burning heater with natural water circulation
- Black Thermo-Spruce exterior — thermally modified for outdoor durability and dimensional stability
- Smooth fiberglass interior for comfortable seating and easy cleaning
- Insulated cover included for heat retention between sessions
- Delivered fully assembled — no kit building required
- Designed and handcrafted in Northern Europe
Key Features
- 6-person wood-fired outdoor hot tub — SOAK-Series
- 304-gallon water capacity
- Integrated stainless steel wood-burning heater
- Natural water circulation during heating
- Black Thermo-Spruce exterior with weather-resistant properties
- Contoured fiberglass interior seating
- Insulated cover for heat retention
- Integrated drainage tap
- Matching Thermo-Spruce access steps included
- Chimney and chimney cap included
- Delivered fully assembled
Specifications
- Model: S4B (SOAK-Series)
- Capacity: Up to 6 bathers
- Water Capacity: 304 gallons
- Exterior Material: Black Thermo-Spruce
- Interior: Fiberglass liner
- Exterior Dimensions: 79" Diameter x 37" H
- Interior Dimensions: 71" Diameter x 33" H
- Maximum Temperature: 106°F
- Heating: Integrated stainless steel wood-burning heater
- Electrical Requirements: None
- Shipping Dimensions: 91" W x 46" D x 87" H
- Shipping Weight: 595 lbs
What's Included
- Fully assembled SaunaLife Model S4B hot tub
- Integrated stainless steel wood-burning heater
- Insulated cover
- Thermo-Spruce access steps
- Drainage system with tap
- Chimney and chimney cap
- Installation instructions
Shipping & Delivery
Free freight shipping is included for delivery within the contiguous United States. The S4B arrives fully assembled on a wooden pallet encased in wood for solid protection, delivered by scheduled curbside freight appointment. In-stock orders typically ship within 4–7 business days.
About This Delivery: The weight and packaging of this handcrafted tub requires delivery by special appointment. It arrives on a wooden pallet encased in wood for solid protection. The driver is responsible for “curbside delivery only” and will lower the item to ground level. Prior to shipping this product, we often contact customers to share shipment details and discuss any extenuating delivery circumstances that may complicate or cause additional delivery expenses. Our goal is to ensure your project’s success.
- Shipping Dimensions: 91" W x 46" D x 87" H
- Shipping Weight: 595 lbs
- Delivery is by appointment — you will be contacted to schedule
- Curbside delivery only — driver lowers to ground level
Site Preparation
- Requires a level, stable outdoor surface — concrete pad, pavers, or reinforced deck recommended
- No electrical connection required
- Maintain chimney clearance and ventilation
- Follow local regulations for wood-burning appliances
- Review applicable local codes and permit requirements
Warranty
Prime Regeneration is an authorized retailer of SaunaLife products. Full manufacturer warranty coverage applies. See the SaunaLife Manufacturer Warranty (PDF).
Manuals & Documentation
FAQ
Does the S4B require electricity?
No. The S4B is fully off-grid and uses an integrated wood-burning heater. No electrical connection is required.
What is the difference between the S4B and S4N?
The S4B features a black Thermo-Spruce exterior for a modern, bold look. The S4N has a natural Thermo-Spruce finish for a warm, classic wood aesthetic. Both offer identical performance and specifications.
Does the S4B arrive assembled?
Yes. The Model S4B is delivered fully assembled — no kit building required on-site.
What is the maximum water temperature?
The S4B can reach a maximum temperature of approximately 106°F.
What foundation is required?
A level, stable outdoor surface is required — concrete pad, pavers, or a reinforced deck are recommended.
Is shipping included?
Yes. Free freight shipping is included for delivery within the contiguous United States. Delivery is by appointment — curbside only.
Is financing available?
Yes. Financing options are available for this purchase. Contact us or proceed to checkout to explore available financing plans.
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SaunaLife S4B Wood-Fired Hot Tub | 6-Person Off-Grid Outdoor Soaking Tub, Black Review Summary
What people like
Pros
- Rapid Heating: The hot tub efficiently heats water to ideal temperatures in a short timeframe, often within 1.5 to 2 hours.
- No Electricity: It operates independently without requiring an electrical connection, utilizing a wood-burning heater for an eco-friendly experience.
- Superior Durability: Crafted from Thermo-Spruce materials, which are reported to last up to two times longer than cedar and offer excellent weather resistance.
- Efficient Fuel: An innovative stove design with a secondary chamber significantly reduces wood consumption by up to 50%.
- Simple Setup: The unit arrives fully assembled, facilitating a straightforward and quick installation process.
- Comfortable Seating: Designed with an ergonomically shaped fiberglass tub that comfortably accommodates up to six individuals.
- Easy Cleaning: The interior fiberglass surface is made for effortless cleaning and maintenance.
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