SaunaLife S4B Wood-Fired Hot Tub | 6-Person Off-Grid Outdoor Soaking Tub, Black
- Authorized Retailer of SaunaLife
- Full Manufacturer Warranty Included
- Financing Options Available
- U.S.-Based Customer Support
- Free Freight Shipping to the Contiguous U.S.
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
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)
- SKU: SL-MODELS4B
- GTIN/Barcode: 810127971110
- 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.
- 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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