Theradia Wellness
SaunaLife S4B Wood-Burning Hot Tub – Black, Up to 6 Persons
SaunaLife S4B Wood-Burning Hot Tub – Black, Up to 6 Persons
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SaunaLife Soak-Series Model S4B Wood-Burning Hot Tub – Black, Up to 6 Persons
Experience the Ultimate in Outdoor Relaxation
The SaunaLife Soak-Series Model S4B Wood-Burning Hot Tub represents the pinnacle of wood-fired hot tub quality, efficiency, and luxury. Combining traditional craftsmanship with modern engineering, the S4B delivers an exceptional soaking experience for up to 6 people — no electricity required. Perfect for backyard gatherings, wellness rituals, or year-round relaxation, this premium hot tub transforms your outdoor space into a private spa sanctuary.
Premium Materials & Handcrafted Durability
Crafted from enhanced Thermo-Spruce wood, the S4B offers superior thermal resistance and lasts up to 2X longer than cedar, ensuring long-lasting beauty and performance in any climate. Its ergonomic fiberglass interior provides total comfort and is easy to clean, while the 304-gallon capacity offers ample space for friends and family to unwind.
- Thermo-Spruce exterior – lasts 2X longer than cedar
- Spacious interior for up to 6 bathers
- Contoured fiberglass lining for enhanced comfort
- Pre-assembled and ready for immediate use
- Matching Thermo-Spruce steps for easy access
- 304-gallon water capacity for deep, full-body soaking
Engineered for Efficiency – No Electricity Needed
Designed and handcrafted in Northern Europe, the Model S4B redefines wood-burning hot tub performance. Its innovative 304 stainless steel heater features dual heat compartments and a self-cleaning corrugated stove, cutting wood consumption by up to 50% while heating water 1.5–2x faster than standard wood-fired tubs.
- Rapid heat-up time: From 40°F to 95°F in 1.5–2 hours
- No electricity required – completely off-grid and eco-friendly
- Polished stainless steel chimney with protective cap
- Extra-thick insulated cover retains heat between uses
- Integrated drainage tap for easy maintenance
This advanced system circulates water through dual channels to evenly distribute heat, while the super-heated air layer between the fiberglass lining and wood exterior accelerates heating efficiency — ensuring the fastest, most cost-effective wood-fired soak available.
Eco-Friendly Outdoor Wellness
With zero electricity requirements, a low wood consumption system, and sustainably sourced Thermo-Spruce wood, the S4B is designed for those who value both wellness and the environment. It’s the perfect blend of traditional soaking and modern sustainability.
Specifications
- Capacity: ~304 gallons
- Exterior Dimensions: 79" diameter × 37" H
- Interior Dimensions: 71" diameter × 33" deep
- Material: Thermo-Spruce wood (1.65” thick) – painted black
- Interior: Dark grey ergonomic fiberglass lining
- Heater: 304 stainless steel, dual heat compartments
- Cover: Extra-thick insulated foam with marine-grade vinyl exterior
- Chimney: Polished stainless steel with protective cap
- Included: Pre-assembled tub, stairs, insulated cover, chimney, drainage tap
Key Features
- Premium wood-burning hot tub – no electricity required
- 304 stainless steel wood stove with rapid 1.5–2 hr heat-up
- Holds 304 gallons – ideal for up to 6 bathers
- Thermo-Spruce construction – 2X longer lifespan than cedar
- Eco-friendly, off-grid soaking solution
- Arrives fully assembled and ready to enjoy
- Designed and handcrafted in Northern Europe




- Description
- SaunaLife Warranty
- SaunaLife Shipping
SaunaLife Soak-Series Model S4B Wood-Burning Hot Tub – Black, Up to 6 Persons
Experience the Ultimate in Outdoor Relaxation
The SaunaLife Soak-Series Model S4B Wood-Burning Hot Tub represents the pinnacle of wood-fired hot tub quality, efficiency, and luxury. Combining traditional craftsmanship with modern engineering, the S4B delivers an exceptional soaking experience for up to 6 people — no electricity required. Perfect for backyard gatherings, wellness rituals, or year-round relaxation, this premium hot tub transforms your outdoor space into a private spa sanctuary.
Premium Materials & Handcrafted Durability
Crafted from enhanced Thermo-Spruce wood, the S4B offers superior thermal resistance and lasts up to 2X longer than cedar, ensuring long-lasting beauty and performance in any climate. Its ergonomic fiberglass interior provides total comfort and is easy to clean, while the 304-gallon capacity offers ample space for friends and family to unwind.
- Thermo-Spruce exterior – lasts 2X longer than cedar
- Spacious interior for up to 6 bathers
- Contoured fiberglass lining for enhanced comfort
- Pre-assembled and ready for immediate use
- Matching Thermo-Spruce steps for easy access
- 304-gallon water capacity for deep, full-body soaking
Engineered for Efficiency – No Electricity Needed
Designed and handcrafted in Northern Europe, the Model S4B redefines wood-burning hot tub performance. Its innovative 304 stainless steel heater features dual heat compartments and a self-cleaning corrugated stove, cutting wood consumption by up to 50% while heating water 1.5–2x faster than standard wood-fired tubs.
- Rapid heat-up time: From 40°F to 95°F in 1.5–2 hours
- No electricity required – completely off-grid and eco-friendly
- Polished stainless steel chimney with protective cap
- Extra-thick insulated cover retains heat between uses
- Integrated drainage tap for easy maintenance
This advanced system circulates water through dual channels to evenly distribute heat, while the super-heated air layer between the fiberglass lining and wood exterior accelerates heating efficiency — ensuring the fastest, most cost-effective wood-fired soak available.
Eco-Friendly Outdoor Wellness
With zero electricity requirements, a low wood consumption system, and sustainably sourced Thermo-Spruce wood, the S4B is designed for those who value both wellness and the environment. It’s the perfect blend of traditional soaking and modern sustainability.
Specifications
- Capacity: ~304 gallons
- Exterior Dimensions: 79" diameter × 37" H
- Interior Dimensions: 71" diameter × 33" deep
- Material: Thermo-Spruce wood (1.65” thick) – painted black
- Interior: Dark grey ergonomic fiberglass lining
- Heater: 304 stainless steel, dual heat compartments
- Cover: Extra-thick insulated foam with marine-grade vinyl exterior
- Chimney: Polished stainless steel with protective cap
- Included: Pre-assembled tub, stairs, insulated cover, chimney, drainage tap
Key Features
- Premium wood-burning hot tub – no electricity required
- 304 stainless steel wood stove with rapid 1.5–2 hr heat-up
- Holds 304 gallons – ideal for up to 6 bathers
- Thermo-Spruce construction – 2X longer lifespan than cedar
- Eco-friendly, off-grid soaking solution
- Arrives fully assembled and ready to enjoy
- Designed and handcrafted in Northern Europe
SAUNA LIFE SAUNA LIMITED LIFETIME WARRANTY
Sauna Life extends this Limited Warranty solely to the original retail consumer purchaser of any Sauna Life sauna purchased from one of its authorized resellers.
LIMITED LIFETIME SAUNA WARRANTY
Sauna Life warrants that the Sauna Life sauna shall be free from defects in workmanship under normal conditions of use and service for the lifetime of the sauna for residential applications after delivery to the original retail purchaser. This warranty is limited to making good any factory assembled component which in the judgment of Sauna Life is deemed defective in workmanship. The warranty does not cover normal material wear, natural weathering of the lumber, or installation or delivery of components and applies only to the original retail purchaser.
WARRANTY PERFORMANCE
For any warranty service, Sauna Life reserves the right to choose, at its option, repair of the problem or a replacement of the defective part. Sauna Life reserves the right to substitute a part or component of
equivalent value, either new or factory reconditioned, and any such repair or replacement shall assume as its warranty only the remaining portion of the warranty on the original product. In the event Sauna Life chooses to repair any malfunction or defect covered by this warranty, a return authorization will be is- sued, and the component will be returned prepaid freight to Sauna Life for repair of the defect. Sauna Life will then ship the component back the original retail purchaser upon completion of the repair. Prior to any return, contact Sauna Life at: Sauna Life, 511 Glenn Avenue, Wheeling, Illinois 60090, telephone number: (800) 957-2862, for packaging and shipping instructions and a return authorization number. In addition, Sauna Life will require photographs of any defect and reserves the right to inspect or designate an agent to inspect any part that is claimed to be defective and covered by this warranty. Labor charges and related expenses for removal, installation, or replacement of the sauna or its components are not covered under this warranty. Normal wear and tear, cosmetic issues or changes to individual pieces of lumber due to nat- ural aging and weathering are not covered. Sauna heaters and added components are not covered by this warranty.
ACTS INVALIDATING WARRANTY
This warranty is void if the Sauna Life sauna has been subject to alteration, misuse or abuse, commercial use, or if any repairs on the sauna are attempted by anyone other than an authorized representative of Sauna Life. Alteration shall include, but is not limited to, deviation from the original assembly instructions, component change, or the addition of any non-approved device or heating system, which contributes to a component or unit failure, or unsafe operating system. Use of the sauna in an application for which it is not designed will void this warranty. This includes, but is not limited to, damage caused by operation above safe sauna operating temperatures, damage caused by added components, damage to the sauna’s surface caused by harsh chemicals, damage caused by movement of the product, and damage caused by acts of God.
DISCLAIMERS
Except as expressly provided above, Sauna Life makes no other representation or warranty, express or im- plied, either in fact or operation of law, statute, or otherwise, and Sauna Life specifically disclaims any and all implied or statutory warranties, including warranties or merchantability and of fitness for a particular purpose. Sauna Life shall not be liable for loss of use of the Sauna Life sauna or other incidental or conse- quential costs, expenses, or damage, which may include but are not limited to, the removal of or reinstal- lation of a wall, deck or other fixture, water leakage, costs of shipping or packaging, applicable taxes, or the payment of any costs or expenses of disassembly, removal, or reinstallation of the product or any part. Your rights may vary from state to state. Under no circumstances shall Sauna Life or its representatives be held liable for injury to any person or damage to any property, however arising, even if caused by the Sau- na Life Sauna or its representatives’ negligence. No distributor, salesperson, dealer, retailer, or other rep- resentative of Sauna Life has the authority to alter or change these warranties either orally or in writing.
Flat Rate Freight: FREE flat rate shipping to the contiguous United States. $1,250 for Canada. Note: On rare occasions, remote or complex delivery areas may not qualify for these rates.
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.