SaunaLife Model S4B Soak-Series Home Wood-Burning Hot Tub, Black
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Important Notice: This product is not eligible for White Glove Delivery or Installation Service.
Shipping Information: This hot tub ships fully assembled via freight delivery. Additional delivery fees may apply depending on your location and access conditions.
Shipping Information: This hot tub ships fully assembled via freight delivery. Additional delivery fees may apply depending on your location and access conditions.
Freight Shipping:
This item ships via freight. A flat-rate shipping cost of $950 will be added at checkout.
This item ships via freight. A flat-rate shipping cost of $950 will be added at checkout.
The SaunaLife Model S4B is a handcrafted outdoor hot tub powered entirely by wood, designed for those seeking an eco-friendly, off-grid luxury spa experience. Built in Northern Europe from long-lasting Thermo-Spruce and fitted with a premium fiberglass lining, this hot tub combines rustic charm, efficient heating, and superior durability.
Key Features
- Thermo-Spruce Build: Lasts up to 2× longer than cedar with superior thermal resistance
- Eco-Friendly: Requires no electricity — perfect for off-grid or remote setups
- Fully Assembled: Ships ready to use, no construction or wiring required
- Rapid Heat-Up: Stainless steel wood-burning heater warms water in under 2 hours
- Spacious Design: Comfortably fits up to 6 bathers with over 304 gallons of water
- Fiberglass Lining: Thick, contoured dark grey interior for comfort and easy cleaning
- Insulated Foam Cover: Extra-thick, folding cover with marine-grade vinyl exterior
- Stainless Steel Chimney: Polished finish with protective shield and cap
- Easy Drainage: Integrated drain tap for simple water removal
What’s Included
- SaunaLife Model S4B Hot Tub (fully assembled)
- Matching Thermo-Spruce steps
- 304 stainless steel wood-burning heater
- Polished stainless steel chimney with cap
- Steel-reinforced insulated foam cover with marine-grade vinyl exterior
- Integrated drainage system with tap
Specifications
| Exterior Dimensions | 79" diameter × 37" high |
| Interior Dimensions | 71" diameter × 33" deep |
| Capacity | Up to 6 bathers |
| Water Volume | 304+ gallons |
| Materials | Thermo-Spruce exterior, fiberglass interior lining |
| Heater | 304 stainless steel wood-burning heater |
| Cover | Steel-reinforced insulated foam with marine vinyl |
| Weight | Approx. 450 lbs (empty) |
| Country of Origin | Northern Europe |
Why Choose Thermo-Spruce?
- Sustainably sourced and eco-friendly
- Lasts 2× longer than untreated cedar
- Superior heat retention and weather resistance
- Natural stability ideal for water-based applications
Perfect For
- Off-grid cabins and wilderness retreats
- Luxury backyard spa sanctuaries
- Vacation homes and rental properties
- Sauna + cold plunge contrast bathing rituals
Compare at a Glance
| Feature | S4B Wood-Burning (This Page) | Typical 240V Electric Spa (see our electric models) |
|---|---|---|
| Power Source | Wood-fired (no electricity needed) | Electric (typically 240V / 50A) |
| Heat-Up Time | ~1.5–2 hours (fuel & ambient dependent) | ~30–90 minutes (heater wattage dependent) |
| Controls & Jets | Manual fire management; no electric jets | Digital controls, pumps, hydrotherapy jets |
| Best For | Off-grid, low-tech ritual, ambiance | Set-and-forget convenience, hydro massage |
| Ongoing Cost | Firewood (see estimates below) | Electricity (kWh) + chemicals |
Note: The S4B is a wood-fired soaking tub—massage jets and powered accessories are not included by design.
Site Prep & Installation
- Foundation: Level, non-combustible, load-rated base (concrete pad or pavers). Keep clear of eaves/overhangs.
- Clearances: Follow local codes for chimney location and setbacks. Keep combustibles away from heater and flue.
- Water Supply: Fill with a standard garden hose. Use integrated drain for water changes.
- Ventilation: Outdoor use only; ensure adequate airflow around the heater and flue.
- Local Codes: Check municipal rules on solid-fuel outdoor appliances before installation.
Operating Guide (Heat-Up & Fuel)
- Fuel: Seasoned hardwood (oak, maple, birch) for hotter, cleaner burns; avoid softwoods and treated wood.
- Heat-Up: Typical 1.5–2 hours to 100–104°F depending on ambient temperature, wind, starting water temp, and wood quality.
- Circulation: Stir water periodically with a clean paddle for even temperature during heating.
- After Use: Cover when not in use to retain heat and reduce debris.
Estimated Running Costs
Costs vary by climate, season, and wood prices.
| Item | Typical Range | Notes |
|---|---|---|
| Firewood per session | ~0.25–0.5 cubic ft | Depends on ambient temp and wood species |
| Approx. fuel cost | ~$2–$6 per heat-up | Based on typical U.S. cord/box pricing |
| Water care | $5–$12/month | Cover + periodic treatment reduces upkeep |
Shipping & Returns
- Ships fully assembled via freight delivery
- 14-day return policy on unused products
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FAQs
Does the S4B need electricity?
No—it's fully wood-fired. No pumps, blowers, or powered jets are included.
How long does it take to heat?
Typically 1.5–2 hours to 100–104°F depending on weather, starting water temp, and wood quality.
Can I use it on a deck?
Yes—if the structure is rated for the filled weight (tub + 304+ gallons + occupants) and local fire codes are met. Non-combustible base recommended.
Is there filtration or sanitation?
The S4B is a soaking tub. Use the cover consistently and refresh/maintain water per your preferred treatment program.
Pro Tip: Use seasoned hardwoods for faster heating and cleaner burns. Keep the insulated foam cover on when heating to reduce warm-up time and retain heat longer.
Why Buy From Us
Authorized Dealer
Direct relationships with every brand we carry.
Full Manufacturer Warranty
Registered coverage on every purchase.
Free Shipping + White-Glove Options
Delivered safely; setup options available at checkout.
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Personalized help before, during, and after your order.
FAQs
Shipping & Delivery
Free curbside shipping on all orders. White-glove delivery/setup available at checkout in most areas. We’ll confirm your preferred date after purchase.
Warranty
Full manufacturer warranty, registered at purchase. Need help with a claim? Our U.S. support team handles it directly with the brand.
Returns
New, uninstalled items can be returned within the brand’s policy window. We’ll help coordinate pickup and any restocking requirements.
Installation & Power
Most saunas/hot tubs require dedicated circuits. We provide spec sheets and can recommend licensed installers in your area.
