Expert help that stays with you

Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is still easy to fix.

Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

Sauna and heater customers also receive free shipping on sauna accessories for life.

Planning a sauna, or need help with one you purchased from us? Our founders have built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Ask a product question.

Attachments
Legacy manuals for older installations

Use these only when the document revision matches the installed product.

Gallery
Includes

Fully assembled hot tub
Steps
Insulated cover
Drainage with tap
Polished stainless steel chimney
Chimney cap
2-Year Limited Residential Warranty
US-Based Support

SaunaLife S4B Wood-Fired Hot Tub | SOAK Series

Experience the most durable, high-performing wood-fired hot tub on the market. With a thick fiberglass interior and thermally modified spruce exterior that lasts up to twice as long as cedar, the SaunaLife S4 Soak Series is equipped with Nordic wood-burning technology that heats the spacious tub quickly, safely and effiently. The fiberglass interior means it won’t leak like barrel tubs, and requires little maintenance. This comfortable tub seats six and is perfect for AirBnbs and Off-Grid getaways.

Build Your Quote:

$5,690.00

Finish
None S4N - Natural Wood S4B - Black +$300.00

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Unleash the Power of Thermo-Spruce in your Wood-Fired Hot Tub

SaunaLife’s Model S4B uses Thermo-Spruce’s resilience, ensuring that your hot tub lasts up to 2X longer than those made of Cedar. The Thermo-Spruce surround combines superior weather resistance and durability, providing an exceptional, eco-friendly hot tub experience. Also available in natural wood that’s been thermally modified to outlast cedar.

Efficiency and Performance – Beyond the Conventional

The Model S4B, crafted with Northern European precision, represents a breakthrough in wood-fired hot tub efficiency. Uniquely designed to heat three times faster than traditional models, it does not require any electricity, making it both eco-friendly and cost-effective. The Model S4B features a self-cleaning corrugated stove with dual chambers that efficiently transfer heat and reduce wood consumption by up to 50%.

Soak in Bliss Sooner with Rapid Response Heat-up Time

A uniquely efficient wood stove heats the spacious 304-gallon water capacity in just 1.5 to 2 hours. This is the fastest heat-up time among wood-burning hot tubs on the market. With Model S4B, you can start soaking in bliss sooner, anytime you wish.

Ready to turn your backyard into a personal retreat? Add the Model S4B wood-fired hot tub to your cart and immerse yourself in luxury and tranquillity.

 

The Safe Choice: AISI 304 Stainless Steel Stoves

These SOAK series hot tubs from SaunaLife feature premium AISI 304 stainless steel stoves, offering durability and peace of mind. Unlike aluminum alternatives, our stainless steel stoves resist chemical cleaning agents, withstand accidental dry heating, and maintain their elegant appearance for years. Engineered for maximum efficiency, these stoves channel 100% of heat energy directly to the water, heating your hot tub in just 1.5-2 hours, debunking the myth that aluminum heats faster.

More importantly, stainless steel eliminates the health concerns associated with aluminum exposure, which has been linked to decreased kidney function, nerve problems, muscle weakness, and bone diseases. Choose DeLux for a safer, more reliable, and longer-lasting hot tub experience that supports your health and relaxation goals.

Planning dimensions

The tub measures 79 in across and 37 in high. The chimney reaches 106 in high. Allow for the heater, steps, and cover when planning the installation; the tub diameter alone is not the full installed footprint.

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★★★★★

“It's been a pleasure working with you. Really appreciated your responsiveness and willingness to share your expertise. Top notch customer service!”

David K.
★★★★★

“Easily the best customer experience I’ve ever had.”

Rick S.

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Planning guides: Cold plunge buying guideCold plunge care and supplies

Expert help that stays with you

Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is still easy to fix.

Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

Sauna and heater customers also receive free shipping on sauna accessories for life.

Planning a sauna, or need help with one you purchased from us? Our founders have built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Ask a product question.

Attachments
Legacy manuals for older installations

Use these only when the document revision matches the installed product.

Gallery
Includes

Fully assembled hot tub
Steps
Insulated cover
Drainage with tap
Polished stainless steel chimney
Chimney cap
2-Year Limited Residential Warranty
US-Based Support