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SaunaLife Model S4B Wood-Fired Hot Tub – 4–6 Person (Black Thermo-Pine)

SaunaLife Model S4B Wood-Fired Hot Tub – 4–6 Person (Black Thermo-Pine)

$5,990.00 - $5,990.00
$5,990.00
$5,990.00 - $5,990.00
$5,990.00

The SaunaLife Model S4B is a premium outdoor wood-burning hot tub engineered for performance, efficiency, and full-group relaxation. Its spacious circular design accommodates up to six bathers, making it ideal for entertaining, recovery, and year-round outdoor use. Constructed with durable Black Thermo-Spruce, the S4B offers enhanced resistance to moisture, decay, and outdoor exposure—lasting up to twice as long as traditional cedar. The contoured fiberglass interior provides a smooth, ergonomic bathing experience with a 304-gallon capacity for deep, comfortable soaking.

The fastest-heating wood-burning hot tub available. At the core of the S4B is a high-efficiency stainless steel wood-burning stove with a self-cleaning dual-chamber design that maximizes heat transfer while reducing wood consumption by up to 50% compared to traditional tubs. Heats 304 gallons from 40°F to 95°F in approximately 1.5–2 hours under optimal conditions. No electrical connection required — fully off-grid operation.

Designed in Northern Europe and delivered fully assembled, the S4B is built for immediate use with minimal setup required.

$950 Flat Rate Freight (Contiguous U.S. Only)
Curbside delivery only. Item lowered to ground level.
Features

• Material: Black Thermo-Spruce
• Interior: Contoured fiberglass insert
• Water Capacity: 304 gallons
• Exterior Dimensions: 79" Diameter x 37"H
• Interior Dimensions: 71" Diameter x 33"H
• Durable Thermo-Spruce construction (lasts up to 2X longer than cedar)
• Fully assembled for easy installation
• High-efficiency stainless steel wood-burning heater
• Dual-chamber stove design for improved heat transfer and reduced wood consumption
• No electricity required (fully off-grid operation)
• Rapid heat-up time (approx. 1.5–2 hours under optimal conditions)
• Polished stainless steel chimney with protective cap
• Matching Thermo-Spruce steps included
• Insulated cover with marine-grade vinyl exterior
• Integrated drainage system
• Designed for outdoor wood-fired hot tub use
• Capacity: Up to 6 bathers

Specifications

• Model: S4B
• Material: Black Thermo-Spruce
• Exterior Dimensions: 79" Diameter x 37"H
• Interior Dimensions: 71" Diameter x 33"H
• Water Capacity: 304 gallons
• Product Weight (Filled): 3064 lbs
• Stove Dimensions: 19.8"W x 11.8"D x 13.1"H
• Chimney Dimensions: 95"H
• Maximum Wood Length: No longer than 13"
• Maximum Temperature: 105°F

Shipping & Delivery

Shipping Instructions:
$950 Flat Rate Freight (Contiguous U.S. Only)
Curbside delivery only. Item lowered to ground level.

Shipping Dimensions: 91"L x 46"W x 87"H
Shipping Weight: 595 lbs

Processing & Transit Time
Most in-stock units ship within 3–7 business days.
Freight transit time varies by location and carrier.

Freight Details
All shipments are sent via LTL freight and require a signature upon delivery.

Delivery Inspection

  • Inspect the shipment while the driver is present.
  • If the crate or packaging shows visible damage, note it clearly on the delivery receipt and take photos immediately.
  • If severe damage is present, refuse delivery.
  • Signing a clear delivery receipt confirms the shipment was received in good condition.

Concealed Damage

  • Damage discovered after unpacking must be reported within 48 hours.
  • Reports must include clear photos of the product and original packaging.
  • Do not discard packaging until the claim is resolved.
    Failure to follow these procedures may limit freight claims.
Installation Manual

Click here to download the Installation Manual (PDF)

Warranty Information

SaunaLife provides a 2-Year Limited Warranty for residential applications from the date of delivery to the original retail purchaser.

This warranty covers defects in factory-assembled components under normal conditions of use and service.

The warranty does not cover:
• Normal wear and tear
• Natural wood aging, expansion, or weathering
• Cosmetic variations in wood grain or tone
• Installation or delivery costs
• Labor for removal or reinstallation
• Damage from misuse, alteration, or commercial use
• Sauna heaters or added components

Warranty service may involve repair or replacement of defective components at SaunaLife’s discretion. Freight for warranty components must be pre-approved with a return authorization.

Returns & Refund Policy

Returns are accepted within 30 days of delivery for new, unused, and uninstalled products with prior authorization.

  • A Return Authorization (RA) must be obtained before shipping any item back.
  • Customer is responsible for return shipping unless the product arrived damaged or incorrect.
  • A small reboxing fee may apply depending on the product condition.
  • Items that have been installed, wired, gas-connected, or used are non-returnable.

Refunds are issued after the returned product is received and inspected.

California Prop 65 Warning

⚠️ WARNING: Cancer and Reproductive Harm: www.P65Warnings.ca.gov

Image Disclaimer

Product images may include AI-assisted or digitally enhanced visuals for marketing and illustrative purposes. Minor details may vary. Refer to the product features and specifications for exact details, dimensions, and included components.

Description

The SaunaLife Model S4B is a premium outdoor wood-burning hot tub engineered for performance, efficiency, and full-group relaxation. Its spacious circular design accommodates up to six bathers, making it ideal for entertaining, recovery, and year-round outdoor use. Constructed with durable Black Thermo-Spruce, the S4B offers enhanced resistance to moisture, decay, and outdoor exposure—lasting up to twice as long as traditional cedar. The contoured fiberglass interior provides a smooth, ergonomic bathing experience with a 304-gallon capacity for deep, comfortable soaking.

The fastest-heating wood-burning hot tub available. At the core of the S4B is a high-efficiency stainless steel wood-burning stove with a self-cleaning dual-chamber design that maximizes heat transfer while reducing wood consumption by up to 50% compared to traditional tubs. Heats 304 gallons from 40°F to 95°F in approximately 1.5–2 hours under optimal conditions. No electrical connection required — fully off-grid operation.

Designed in Northern Europe and delivered fully assembled, the S4B is built for immediate use with minimal setup required.

$950 Flat Rate Freight (Contiguous U.S. Only)
Curbside delivery only. Item lowered to ground level.