4-Person Outdoor ThermoWood Sauna Kit — SAK25470
This is a 4-person outdoor sauna kit constructed from thermally modified ThermoWood, designed for permanent backyard installation. Built for homeowners who want a mid-size, weather-resistant outdoor sauna, it features a bituminous tile roof, tempered glass doors and windows, LED bench lighting, and an integrated ventilation system. Available with or without a heater; electric heater options are sold as separate variants — select your preference above.
Why This Outdoor Sauna Kit
- Built for outdoor permanence — thermally modified ThermoWood resists moisture and dimensional change without chemical treatment, extending service life in exposed conditions.
- Built for all-weather use — bituminous tile roof provides durable weather protection standard on permanent outdoor structures.
- Built for four people — spacious interior with ThermoWood sunbed-style benches sized for family or small-group use. See product photos or Floor Plan for full dimensions.
- Built for electric heating — choose no heater or Harvia Kip 8.0kW electric (black or silver) to match your site and preference.
- Built for owner assembly — pre-fabricated kit designed for approximately one day of on-site assembly.
Key Features
- Construction material — ThermoWood (thermally modified wood), timber sourced from Finland.
- ThermoWood process — wood is modified at elevated temperature using steam under atmospheric pressure, with no added chemicals. The process permanently reduces equilibrium moisture content, improves dimensional stability, and enhances resistance to biological degradation. Suitable for indoor and outdoor use in all climates.
- Roof — bituminous tiles
- Doors and windows — tempered glass
- Benches — ThermoWood sunbed style
- Lighting — LED strips installed under benches
- Ventilation — integrated ventilation system
- Assembly — pre-fabricated kit; approximately 1 day on-site assembly
Specifications
| Brand | SAKSBY |
| Model / SKU | SAK25470 |
| Capacity | 4 persons |
| Dimensions | See product photos or Floor Plan (PDF) for full exterior and interior dimensions |
| Weight | 1,390 lbs |
| Primary material | ThermoWood (thermally modified wood, timber sourced from Finland) |
| Roof material | Bituminous tiles |
| Doors / windows | Tempered glass |
| Lighting | LED under benches |
| Ventilation | Integrated system |
| Heater | Select variant above — options include no heater or Harvia Kip 8.0kW electric (black or silver) |
| Warranty | 5 years |
Installation and Setup
- Primary use: outdoor installation; indoor use possible with modifications (omit outdoor-specific components per supplier documentation)
- Assembly time: approximately 1 day
- Heater installation: requirements vary by heater variant — refer to the heater documentation included with your selected variant.
Shipping and Warranty
- Shipping: free standard shipping within the United States. See our Shipping Policy for delivery windows and full details.
- Returns: 30-day return window; item must be unused and in original packaging. Damage must be reported within 48 hours of delivery. A 25% restocking fee applies to approved returns. See our Return Policy for full details.
- Warranty: 5-year manufacturer warranty
Common Questions
Can the SAK25470 4-person outdoor ThermoWood sauna kit be installed indoors?
Yes, with modifications. Outdoor-specific components such as the roof and exterior siding can be omitted for indoor installations. Review the supplier's installation documentation for indoor-specific requirements before purchase.
What heater options are available for the SAK25470?
The SAK25470 is available in three configurations: no heater, Harvia Kip 8.0kW electric in black, and Harvia Kip 8.0kW electric in silver. Select your preferred option using the variant selector on this page.
What is the return policy for this sauna kit?
Serene Lifestyle Co accepts returns within 30 days of delivery. The item must be unused and in its original packaging. Damage must be reported within 48 hours of delivery. A 25% restocking fee applies to approved returns. See our Return Policy for full details.
What warranty does the SAK25470 carry?
The SAK25470 4-person outdoor ThermoWood sauna kit carries a 5-year warranty. Contact Serene Lifestyle Co at support@SereneLifestyleCo.com or (855) 501-5420 for warranty service.
How long does assembly take?
The SAK25470 is a pre-fabricated kit designed for approximately one day of on-site assembly. Assembly instructions are included.
Manuals
Safety and Electrical Notice
Installation must comply with local electrical and building codes. Serene Lifestyle Co recommends professional installation where indicated in the product documentation. Specifications are provided by the manufacturer; verify site requirements before purchase.
The information presented on this page is for general wellness and educational purposes only. Statements regarding products sold by Serene Lifestyle Co have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease. Consult a qualified healthcare provider before beginning any new wellness routine, especially if you are pregnant, nursing, or have a pre-existing medical condition.
