SaunaLife Model S1B 1-Person Cold & Hot Immersion Tub

Designed and handcrafted in Northern Europe, the Model S1B arrives pre-assembled for easy installation — simply place, fill, and plunge. The 1.65" thick black Thermo-Pine exterior lasts up to twice as long as cedar with superior thermal resistance for both cold and heat retention. The black contoured fiberglass interior is ergonomically shaped for a single bather in full-submersion comfort. Matching black Thermo-Pine stairs make entry and exit effortless. Built-in 3/4" NPT chiller connections make it straightforward to connect a compatible water chiller for consistent temperature control. Suitable for indoor or outdoor use with drainage required.

Key features

• 1-person cold and hot immersion tub, use as a cold plunge or hot soak
• Fully assembled, no installation required
• Black Thermo-Pine tub surround, lasts up to 2x longer than cedar, 1.65" thick
• Superior thermal resistance for cold and heat retention
• Black contoured fiberglass interior, ergonomically shaped for full-body immersion
• 124-gallon water capacity
• Built-in chiller connections, 3/4" NPT fittings
• Matching black Thermo-Pine round deluxe stairs
• Integrated 1" drainage
• Suitable for indoor or outdoor use (drainage required)
• Designed by SaunaLife, handcrafted in Northern Europe
• 2-year limited warranty (consumer use)

Brand: SaunaLife
Model: MODEL S1B
Material: Black Thermo-Pine
Capacity: 1 person
Water Capacity: 124 gallons
Interior Dimensions: 34.4" Diameter x 36"H (87 x 91 cm)
Exterior Dimensions: 40" Diameter x 41.3"H (102 x 105 cm)
Wall Thickness: 0.7" (1.7 cm) Thermowood
Foundation Beams: 3.94" x 3.94" (10 x 10 cm)
Chiller Connections: 3/4" (2 cm) NPT
Drainage: 1" (3 cm)
Product Weight: 124 lbs (56.2 kg)
Filled Weight: 1,158 lbs (525.2 kg)
Warranty: 2-year limited (consumer use)

Fully assembled black Thermo-Pine immersion tub

• Matching black round deluxe Thermo-Pine stairs
• Black fiberglass insert
• Integrated 1" drainage
• Built-in 3/4" NPT chiller connections
• Installation instructions
• 2-year limited warranty

Note: a water chiller is required if consistent temperature control is desired and is sold separately. A compatible chiller ships free when ordered together with this tub.

The Model S1B arrives fully assembled; no tub installation required. Place on a level surface with access to drainage. Connect a compatible water chiller via the built-in 3/4" NPT fittings following the chiller's installation manual. Fill with water before starting the chiller. Note: filled weight is 1,158 lbs; ensure your floor or surface can support this load before placing indoors. Suitable for indoor or outdoor use; drainage is required for both. Refer to the included installation instructions for full setup guidance.

• Installation Manual

2-year limited warranty (consumer use). Covers manufacturing defects in materials and workmanship under normal residential use. Does not cover normal wear and tear, damage from improper installation or misuse, cosmetic damage, unauthorized modifications, or shipping damage reported after 48 hours. Contact support@marterraelements.com with your order number, photos, and a description of the issue. We aim to respond within 2 to 3 business days. Warranty is non-transferable and requires original proof of purchase.

Saunalife Warranty

$495 flat rate freight to the contiguous United States. A compatible chiller ships free when ordered together. Remote or complex delivery areas may not qualify for this rate. Delivery is by special appointment on a wooden pallet encased in wood for solid protection; we will contact you prior to shipping to share delivery details and discuss any circumstances that may affect the process. Standard delivery is curbside only; the driver lowers the item to ground level but is not responsible for moving it to its final location. Returns are accepted within 30 days of delivery and require prior approval before anything is sent back. Please reach out to support@marterraelements.com to get the process started. Items must be unused, undamaged, and in their original condition with original packaging intact. For additional details, please visit our Return & Refund page.