Mande MW20 ThermoWood Outdoor Sauna
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The Mande MW20 is the largest sauna in the MW Series, designed for homeowners seeking a spacious outdoor wellness retreat without compromising on craftsmanship or performance. Handcrafted in Lithuania from premium ThermoWood, the MW20 accommodates up to 6 people and offers the flexibility of both electric and traditional wood-burning sauna experiences.
The Ultimate MW Series Sauna
The MW20 represents the pinnacle of the Mande Spa USA outdoor sauna collection. Designed for larger families, entertaining, wellness enthusiasts, and those who simply want more room to relax, the MW20 delivers authentic European sauna culture in a spacious outdoor format.
Built from durable ThermoWood and equipped with tempered glass, integrated ventilation, under-bench LED lighting, and premium construction throughout, the MW20 is engineered for long-term outdoor performance and daily enjoyment. Whether used for recovery, relaxation, social gatherings, or contrast therapy routines, the MW20 creates a dedicated wellness destination in your own backyard.
Why Choose the MW20?
- Largest sauna in the Mande MW Series.
- Designed for up to 6 people.
- Ideal for families, entertaining, and shared sauna sessions.
- Compatible with both electric and wood-burning heaters.
- Premium ThermoWood construction for outdoor durability.
- Handcrafted in Lithuania using traditional European sauna principles.
Designed for Premium Outdoor Living
- Creates a dedicated backyard wellness retreat.
- Spacious bench layout allows users to spread out comfortably.
- Tempered glass enhances natural light and openness.
- Integrated LED lighting adds atmosphere and visual appeal.
- Pairs perfectly with cold plunges, hot tubs, and outdoor wellness spaces.
- Built for year-round use when properly installed.
Choose Your Sauna Experience
Unlike the MW12 and MW16, the MW20 offers flexibility in how you heat your sauna. Customers can choose the convenience of an electric heater with WiFi controls or the authentic experience of a traditional wood-burning sauna stove.
Electric Configuration
- Harvia KIP80W 8kW Electric Sauna Heater
- Harvia Xenio WiFi Control
- 1 box AC3000 stones required
- 2nd box AC3000 stones recommended
- Convenient operation and temperature control
- Ideal for frequent residential use
Wood-Burning Configuration
- Harvia M3 16.5kW Wood-Burning Sauna Stove
- Harvia 1500mm Stainless Steel Chimney Kit
- 2 boxes AC3020 sauna stones required
- Traditional Finnish sauna experience
- No electrical heater required
- Outdoor installations only
What's Included
Sauna Structure
- MW20 ThermoWood outdoor sauna cabin
- ThermoWood wall and roof construction
- Tempered safety glass door
- Tempered glass window elements
- Bituminous roofing system
- Weather-resistant exterior components
Interior Features
- ThermoWood benches
- Integrated under-bench LED lighting
- Integrated ventilation system
- Traditional sauna room layout
- Comfortable seating for up to 6 people
Required Add-Ons
Electric Setup
For the most convenient MW20 setup, choose the Harvia KIP80W 8kW electric heater with Harvia Xenio WiFi control.
- Harvia KIP80W 8kW Electric Sauna Heater
- Harvia Xenio WiFi Remote Control
- 1 box AC3000 stones required
- 2nd box AC3000 stones recommended for airflow and aesthetics
Wood-Burning Setup
For a traditional wood-fired sauna experience, choose the Harvia M3 stove with the required chimney kit and AC3020 sauna stones.
- Harvia M3 16.5kW Wood-Burning Sauna Stove
- Harvia 1500mm Stainless Steel Chimney Kit
- 2 boxes AC3020 stones required
- Outdoor installations only
MW20 Specifications
| Model | Mande MW20 ThermoWood Outdoor Sauna |
|---|---|
| Capacity | Up to 6 people |
| Exterior Dimensions | 83.5 in L × 83.5 in W × 83.5 in H |
| Interior Width | 78 in |
| Interior Bench Depth | 64 in |
| Interior Height | 75.6 in |
| Bench Height | 16.5 in / 34.3 in (lower / upper) |
| Bench Depth | 23.6 in |
| Wall Thickness | 3.5 in |
| Material | ThermoWood (thermally modified wood) |
| Glass | Tempered safety glass door and windows |
| Roof System | Bituminous roofing tiles |
| Lighting | Integrated LED lighting under benches |
| Ventilation | Integrated ventilation system |
| Country of Origin | Lithuania |
| Shipping Weight | 1,565 lbs |
| Shipping Dimensions | 6 ft 7 in × 3 ft 9 in × 3 ft 9 in |
| Warranty | 5-Year Limited Residential Structural Warranty |
Built for Spacious Luxury
The MW20 was designed for homeowners who want the largest sauna experience available in the MW Series. With seating for up to six people and a deeper bench layout than the MW16, the MW20 creates an inviting environment for relaxation, conversation, recovery, and wellness.
Whether installed beside a pool, integrated into a backyard retreat, paired with a cold plunge, or used as the centerpiece of a dedicated wellness space, the MW20 delivers authentic European sauna culture in a format built for modern outdoor living.
Designed for Larger Groups
- Comfortably accommodates up to 6 people
- Ideal for families and entertaining
- Largest bench area in the MW Series
- Room to stretch out and relax
- Suitable for shared wellness routines
Premium Outdoor Performance
- ThermoWood construction resists moisture and decay
- Built for year-round outdoor use
- Integrated ventilation promotes airflow
- Bituminous roofing system enhances weather protection
- Tempered glass provides durability and natural light
ThermoWood Construction
Every MW20 sauna is handcrafted using premium ThermoWood, a specially treated wood that undergoes a chemical-free thermal modification process. This process improves dimensional stability, reduces moisture absorption, and increases resistance to decay while preserving the natural beauty of real wood.
ThermoWood is widely regarded as one of the best materials available for outdoor sauna construction because it performs exceptionally well in changing climates and demanding outdoor environments.
Benefits of ThermoWood
- Improved resistance to moisture
- Reduced warping and twisting
- Enhanced dimensional stability
- Greater resistance to decay
- Long service life in outdoor environments
Built for Long-Term Ownership
- Designed for outdoor installation
- Performs well in humid climates
- Suitable for cold winter environments
- Requires minimal ongoing maintenance
- Naturally develops character over time
Installation Requirements
The MW20 is designed for permanent outdoor installation and should be placed on a stable, level foundation capable of supporting the sauna's weight and occupants. Proper site preparation helps ensure long-term structural performance and optimal sauna operation.
Approved Foundation Types
- Concrete slab
- Reinforced structural deck
- Compacted paver foundation
- Properly prepared gravel base
- Other structurally sound, level surfaces
Site Preparation
- Level foundation required
- Proper drainage recommended
- Adequate clearance for assembly
- Access for freight delivery required
- Electrical planning should be completed before installation
Electric Sauna Configuration
The most convenient MW20 setup uses the Harvia KIP80W electric sauna heater paired with the Harvia Xenio WiFi control system. This configuration provides simple operation, programmable controls, and traditional sauna temperatures without the maintenance associated with a wood-burning stove.
Required Components
- Harvia KIP80W 8kW Electric Sauna Heater
- Harvia Xenio WiFi Remote Control
- 1 Box AC3000 Sauna Stones (required)
- 2nd Box AC3000 Stones (recommended)
Benefits of Electric Heating
- Push-button convenience
- WiFi-enabled operation
- Consistent temperature control
- Lower day-to-day maintenance
- Excellent for frequent residential use
Traditional Wood-Burning Configuration
For customers seeking an authentic Finnish-style sauna experience, the MW20 can also be configured with the Harvia M3 wood-burning sauna stove. This setup delivers traditional wood-fired heat and creates the atmosphere many sauna enthusiasts prefer.
Required Components
- Harvia M3 16.5kW Wood-Burning Sauna Stove
- Harvia 1500mm Stainless Steel Chimney Kit
- 2 Boxes AC3020 Sauna Stones
- Proper chimney installation
Benefits of Wood-Burning Heat
- Traditional sauna experience
- Natural radiant heat
- Authentic wood-fired atmosphere
- No electric sauna heater required
- Popular among dedicated sauna enthusiasts
Delivery and Assembly
The MW20 ships flat-packed and is assembled on-site. Large structural components arrive pre-manufactured to simplify installation while preserving the premium craftsmanship and durability expected from a luxury outdoor sauna.
| Shipping Weight | 1,565 lbs |
|---|---|
| Shipping Dimensions | 6 ft 7 in × 3 ft 9 in × 3 ft 9 in |
| Delivery Method | Freight Carrier |
| Assembly | Required |
| Recommended Installers | Two or more adults |
Warranty Coverage
The MW20 is backed by a 5-Year Limited Residential Structural Warranty, reflecting Mande Spa USA's commitment to quality craftsmanship, premium materials, and long-term outdoor durability.
Covered Under Warranty
- Structural manufacturing defects
- ThermoWood construction defects
- Factory-installed tempered glass defects
- Bench and interior structural defects
- Defects in supplied hardware and fasteners
Warranty Limitations
- Improper installation or assembly
- Electrical or chimney installation issues
- Foundation movement or settling
- Normal weathering of wood surfaces
- Commercial or revenue-generating applications
Helpful Resources
MW20 Installation Guide
Review assembly instructions, foundation requirements, and installation recommendations before scheduling delivery.
View Installation GuideElectrical Requirements
Share this document with your electrician before installation to ensure proper planning and code compliance.
View Electrical RequirementsFrequently Asked Questions
Does the MW20 include a sauna heater?
No. The MW20 sauna cabin is sold separately. Customers may choose either an electric or wood-burning heating configuration.
What electric heater is recommended?
We recommend the Harvia KIP80W 8kW Electric Sauna Heater paired with the Harvia Xenio WiFi Control System.
Can the MW20 use a wood-burning stove?
Yes. The MW20 is compatible with the Harvia M3 16.5kW Wood-Burning Sauna Stove when installed outdoors with the required chimney system and accessories.
How many people can use the MW20?
The MW20 is designed for up to 6 people and is the largest sauna in the Mande MW Series.
Are sauna stones included?
No. Sauna stones are sold separately. Stone requirements depend on the heater configuration selected.
Can the MW20 remain outdoors year-round?
Yes. The MW20 was specifically designed for outdoor installation and year-round use when installed on a proper foundation with adequate drainage.
How long does the sauna take to heat up?
Heat-up times vary based on outdoor temperature, installation conditions, and heater selection, but most users can expect approximately 30 to 45 minutes.
Does the MW20 require plumbing?
No. The MW20 does not require plumbing, water supply lines, or drain connections.
What makes the MW20 different from the MW16?
The MW20 offers the largest seating capacity in the MW Series, deeper interior bench space, and the flexibility to support either electric or wood-burning sauna heating systems.
Why Buy the MW20 from My Luxury Home Spa?
As an authorized Mande Spa USA dealer, we help customers select the right sauna configuration, heater package, controls, stones, and accessories to create a complete outdoor wellness experience. Whether you choose electric convenience or traditional wood-fired heat, we can help you build the sauna system that best fits your goals.
Authorized Dealer Benefits
- Authorized Mande Spa USA dealer
- Product selection assistance
- Installation planning support
- Warranty claim assistance
- Expert guidance before and after delivery
Create a Complete Wellness Retreat
- Pair with a cold plunge
- Add red light therapy
- Create a contrast therapy routine
- Integrate into an outdoor living space
- Build a backyard wellness destination
Why Buy From Us
FAQs
Shipping & Delivery
Free shipping available on select orders. White-glove delivery and setup can be arranged at an additional cost 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.
