SaunaLife Model S4 Wood-Fired Hot Tub
Model S4 Outdoor Wood-Burning Hot Tub
The SaunaLife SOAK-Series Model S4 is a premium outdoor wood-burning hot tub designed to deliver a comfortable and relaxing bathing experience for up to 6 people. Built with quality materials and engineered in Northern Europe, it combines traditional wood-fired heating with modern design and efficiency.
Ready for Relaxation
The Model S4 arrives fully assembled for easy setup. It features an ergonomically shaped fiberglass interior for comfort and a thermally enhanced spruce exterior designed for outdoor durability and weather resistance.
The interior surface is smooth and easy to clean, making maintenance simple after each use.
Wood-Fired Heating Experience
This hot tub uses a stainless steel wood-burning heater to warm the water without electricity, making it suitable for outdoor environments where power access is limited.
Heating performance may vary depending on weather conditions, wood type, and starting water temperature. Under typical conditions, the system can heat 304 gallons of water from approximately 40°F (5°C) to 95°F (35°C) in about 1.5 to 2 hours.
For safety, the hot tub must always be used outdoors in a well-ventilated area, and proper supervision and fire safety practices are required when operating the wood-burning stove.
Efficient Design
The integrated heater uses a dual-chamber design intended to improve heat transfer and reduce fuel consumption compared to basic single-chamber systems. Airflow channels help circulate warm water more evenly throughout the tub.
Key Features
- Thermo-Spruce wood exterior for improved outdoor durability
- Fiberglass interior shell designed for comfort and easy cleaning
- Wood-burning stainless steel heater (304-grade stainless steel)
- Fully assembled delivery for easier installation
- No electricity required
- Capacity for up to 6 bathers
- Approximate capacity: 304 gallons
- Integrated drainage tap
- Matching wooden steps included
- Insulated cover for heat retention and protection
- Stainless steel chimney with protective cap
Dimensions
- Exterior: 79" diameter × 37" height
- Interior: 71" diameter × 33" depth
- Weight: 595 lbs
Safety Notice
This product is intended for outdoor use only. Always follow manufacturer instructions for safe operation of wood-burning equipment, including proper ventilation, fire supervision, and safe handling of hot surfaces.
Resources
At Inside Sauna, we aim to offer some of the most competitive sauna prices available online. To maintain fair and consistent pricing, we work closely with our manufacturers and comply with Minimum Advertised Price (MAP) policies. These guidelines help protect our customers and ensure ethical pricing among authorized retailers.
If you find the same product listed at a lower price on another online store, please reach out to us. Our team will review the offer to confirm it meets MAP requirements and dealer authorization standards. Once verified, we will gladly match the price.
Already placed your order? No problem — we can provide a partial refund or apply a custom price adjustment where applicable.
Price Match Eligibility Requirements
To ensure fairness and accuracy, the following conditions apply:
- Promotional offers such as rebates, coupon codes, or “buy one, get one” deals are excluded
- The competing product must be currently in stock
- The competitor must operate as an online-only store (no physical locations)
- Auction platforms, liquidation sites, and discount marketplaces are not eligible
- The competitor must be an authorized dealer of the specific product
If you want to verify whether a product qualifies for price matching before purchasing, we recommend contacting us first. Our support team will review the details and assist you.
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