SaunaLife Model S4B Soak-Series Home Wood-Burning Hot Tub, Black
Regular price$5,990.00
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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 location and access.
Shipping Information: This hot tub ships fully assembled via freight delivery. Additional delivery fees may apply depending on location and access.
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, wood-fired outdoor soaking tub designed for simple, off-grid operation. Built in Northern Europe with thermally modified spruce (Thermo-Spruce) and a premium fiberglass lining, it blends natural materials with durable construction for a relaxing, low-tech soak experience.
Key Features
- Thermo-Spruce Exterior – Thermally modified spruce is engineered for outdoor durability and dimensional stability.
- Off-Grid Operation – Wood-fired design requires no electricity.
- Ships Fully Assembled – Ready to place and fill; no wiring or on-site construction needed.
- Efficient Heat-Up – 304 stainless steel wood heater typically warms water in about 1.5–2 hours (conditions vary).
- Comfortable Capacity – Seats up to 6 bathers with a contoured fiberglass interior.
- Insulated Foam Cover – Folding, steel-reinforced cover with marine-grade vinyl helps retain heat between sessions.
- Stainless Chimney Assembly – Includes protective shield and cap.
- Easy Drainage – Integrated drain tap for straightforward water changes.
What’s Included
- SaunaLife Model S4B soaking 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
- Integrated drainage tap
Specifications
| Exterior Dimensions | 79″ diameter × 37″ high |
| Interior Dimensions | 71″ diameter × 33″ deep |
| Seating Capacity | Up to 6 bathers |
| Water Volume | Approx. 304 gallons |
| Materials | Thermo-Spruce exterior, fiberglass interior lining |
| Heater | 304 stainless steel wood-burning heater |
| Cover | Steel-reinforced insulated foam with marine vinyl |
| Empty Weight | Approx. 450 lbs |
| Country of Origin | Northern Europe |
Why Thermo-Spruce?
- Sustainably sourced wood that’s thermally modified for outdoor use
- Enhanced weather resistance and dimensional stability
- Supports heat retention when paired with the insulated cover
- Natural look and feel suited to backyard and retreat settings
Perfect For
- Off-grid cabins and wilderness retreats
- Backyard spa sanctuaries with a natural aesthetic
- Vacation homes and rental properties
- Sauna + cold plunge contrast routines
Compare at a Glance
| Feature | S4B Wood-Fired (This Page) | Typical 240 V Electric Spa (see electric models) |
|---|---|---|
| Power Source | Wood-fired (no electricity) | Electric (typically 240 V / 50 A) |
| Heat-Up Time | ~1.5–2 hours* | ~30–90 minutes* |
| Controls & Jets | Manual fire; no powered jets | Digital controls, pumps, jet arrays |
| Best For | Off-grid ritual, ambiance, simplicity | Set-and-forget convenience |
| Ongoing Cost | Firewood (see estimates below) | Electricity (kWh) + water care |
*Times vary with ambient temperature, starting water temperature, and heater output.
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/setbacks. Keep combustibles away from the heater and flue.
- Water Supply: Fill with a standard garden hose; use integrated drain for water changes.
- Ventilation: Outdoor use only with adequate airflow around the heater and flue.
- Local Codes: Check municipal rules for solid-fuel outdoor appliances before installation.
Operating Guide (Heat-Up & Fuel)
- Fuel: Use seasoned hardwoods (e.g., oak, maple, birch). Avoid softwoods or treated lumber.
- Heat-Up: Typically 1.5–2 hours to ~100–104°F depending on weather, wind, starting water temp, and fuel quality.
- Circulation: Stir water periodically with a clean paddle for even temperature during heating.
- After Use: Keep covered to help retain residual heat and minimize debris.
Estimated Running Costs
Actual costs vary by climate, season, and local wood pricing.
| Item | Typical Range | Notes |
|---|---|---|
| Firewood per session | ~0.25–0.5 cubic ft | Varies by ambient conditions and fuel species |
| Approx. fuel cost | ~$2–$6 per heat-up | Based on typical U.S. retail wood pricing |
| Water care | $5–$12/month | Cover + periodic treatment help reduce upkeep |
Shipping & Returns
- Ships fully assembled via freight delivery
- 14-day return policy on unused products (see store policy for details)
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FAQs
Does the S4B need electricity?
No. It’s fully wood-fired and does not include powered pumps or jets.
How long does it take to heat?
Typically 1.5–2 hours to ~100–104°F, depending on weather, starting water temperature, and wood quality.
Can I place it on a deck?
Yes—if the structure is rated for the filled weight (tub + ~304 gallons + occupants) and local fire codes are met. A non-combustible base is recommended.
Is there built-in filtration?
The S4B is a soaking tub without powered filtration. 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 cover on during warm-up to reduce heat-up time and retain heat between sessions.
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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.
