
SaunaLife S4B: a six person wood fired hot tub in black thermo-spruce that needs no electricity
The SaunaLife S4B is a wood fired hot tub for up to six people. It arrives fully assembled. The round exterior is black thermo-spruce, which is spruce baked in a kiln so it stands up to water and weather. Inside is a smooth black fiberglass basin shaped for sitting comfortably. The tub is about 81 inches across and holds 304 gallons.
A wood stove heats the water, so it works anywhere with no power hookup. The stainless steel stove has two chambers to draw more heat from the fire and burn less wood. It brings the water up to soaking temperature in under two hours. A tall chimney carries the smoke above your head. It comes with the stove, the chimney, matching black wood steps, an insulated cover that folds up for storage, and a drain tap. Wood care oils and SaunaLife cleaner are optional on the page. Like the natural wood look? See the SaunaLife S4N wood fired hot tub. The SaunaLife S4B ships from My Cozy Outdoors by flat rate freight with No Sales Tax (except WY) and the full manufacturer warranty.
SaunaLife combines innovative engineering with meticulous craftsmanship to create spaces that are beautiful, comfortable, and built for a lifetime of enjoyment and good health. The level of quality and attention to detail that goes into each design is off the charts.
Hand-crafted in Northern Europe by sauna fanatics, each room is created especially for those who understand and crave the health and wellness benefits of sauna bathing. SaunaLife builds each room as if we were making it for ourselves.
SaunaLife Outdoor Saunas
These innovative rooms provide the ability to enjoy your natural surroundings during each sauna session. Crafted of the highest-grade wood materials, each space is designed to withstand changing weather conditions.
The features within each room work in unison to create a comfortable bathing sanctuary that both soothes and invigorates. Select from a variety of sizes and styles of outdoor sauna cabins that best suit your design needs and preferences.
Barrel Outdoor Saunas
Create a personal backyard sauna sanctuary with SaunaLife outdoor sauna barrels. These innovative spaces provide a relaxing experience steps away from your home.
SaunaLife barrel saunas are ergonomically engineered for superior comfort, with contoured seating and arched, and wood slanted backrests. These spaces are available in a variety of sizes and configurations to best suit your bathing needs.
Cube-Series Saunas
Premium quality materials are evident everywhere on Cube-Series Saunas. The exterior wood is made from durable full-length staves that have been organically thermally enhanced. This Thermo-Spruce wood is stronger, more dimensionally stable, naturally resists decay and pests, and will far outlast conventional wood. A complete shingle kit with drip rails ensures superior water management and a dry interior. The bronze-tinted 8mm thick front door is both beautiful and tempered for your safety.
SaunaLife Wood-Burning Hot Tubs
These wood-fired hot tub arrives completely assembled and is easy to set up. Its ergonomically shaped fiberglass tub is a comfortable place for up to 6 people. The interior surface is easy to clean, and the exterior is crafted from thermally enhanced spruce for superior weather resistance and durability.
SaunaLife Cold Plunges
Pre-assembled for easy installation, the enhanced Thermo-Pine wood exterior will last up to 2X longer than cedar and has superior thermal resistance. The spacious fiberglass tub contoured for the shape of your body has a 200-gallon water capacity to allow you to submerge in comfort. Matching Thermo-Pine stairs make it easy to get in and out of the tub.
Highlights
SaunaLife Model S4B Wood-Fired Hot Tub- Soak-Series Home Wood-Burning Hot Tub, Black, Up to 6 Persons
The SaunaLife SOAK-Series Model S4B represents the very best in wood-burning hot tub quality, efficiency, and luxury.
- Thermo-Spruce materials (lasts up to 2X longer than Cedar)
- Luxury outdoor wood-burning hot tub
- Designed for outdoor ergonomic hot tub bathing experiences
- Arrives fully assembled and no electricity required (eco-friendly)
- Spacious interior holds over 304 gallons of pure water bathing pleasure
- Thick black contoured fiberglass lining provides enhanced bather comfort
- Stainless steel wood-burning heater utilizes dual heat compartments for unmatched efficiency
- Rapid response heat-up time prepares water to ideal temperatures in under 2-hours
- Wood-burning heater constructed of 304 stainless steel
- Polished stainless steel chimney with protection
FAQ
What is different about the black version of this hot tub?
The S4B wears the darker palette: a thick black contoured fiberglass lining inside and a black marine-grade vinyl cover exterior, paired with the same thermally enhanced spruce surround. If you prefer the grey-lined look, the natural version is the S4N; the engineering underneath the two tubs is identical.
Does it need a power hookup?
No. The wood-burning stove heats the water directly, so no electrical connection is required at all, and the tub arrives completely assembled. That means you can site it wherever the view is best rather than wherever the electrician can reach, and setup is essentially placement, filling, and lighting the first fire.
How fast does the water heat?
The stove takes 304 gallons from 40 degrees to 95 degrees Fahrenheit in about 1.5 to 2 hours, roughly a third of the time of traditional wood-fired tubs. A secondary chamber captures heat from the smoke, cutting wood use by up to half, and the air gap between liner and wood exterior is super-heated to speed things further.
How warm can I run it?
The specifications list a 106-degree Fahrenheit maximum, standard spa territory. The stove design draws cooler water through a lower channel and returns it through an upper one, equalizing temperature through the tub, so you regulate warmth simply by how much and how often you feed the fire.
What ships with the tub?
Everything to start soaking: the fully assembled tub, matching wood steps, the insulated steel-reinforced foam cover in black marine vinyl, an integrated drainage tap, and the polished stainless steel chimney with its cap. Those included items are also listed in this page’s add-on section so you can confirm them when ordering.
What firewood should I use?
Seasoned logs up to 16 inches long, the maximum the firebox accepts. The corrugated, self-cleaning stove is built from 304 stainless steel with dual heat compartments for efficient burns, and the polished chimney carries smoke well above the waterline, so tending the fire stays simple through a long evening soak.
How do I keep it clean through the seasons?
The black fiberglass interior wipes clean easily, and the integrated tap drains the tub for full water changes without siphoning. The Thermo-Spruce surround lasts up to twice as long as cedar, and this page’s Wood Treatment selector offers wax, paraffin oil, and cleaner. See both finishes in our wood fired hot tub collection.
Shipping
Flat Rate Freight: $950 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.