Spacious Outdoor Sauna Living
The Mande MW20 is the largest sauna in the MW Series, offering a spacious outdoor wellness retreat for families, entertaining, recovery, and everyday relaxation. Handcrafted in Lithuania from premium ThermoWood, it accommodates up to six people and can be configured with either an electric sauna heater or a traditional wood-burning stove.
Up to 6 People Largest MW Series Sauna ThermoWood Construction Electric or Wood-Burning Outdoor Installation Made in Lithuania 5-Year Warranty
Explore the design, materials, interior layout, and craftsmanship of the Mande MW20 outdoor sauna.
The Largest Sauna in the Mande MW Series
The MW20 is designed for homeowners who want more interior space without sacrificing the warmth, craftsmanship, and simplicity of a traditional European sauna. Its generous bench layout provides room for up to six people, making it ideal for shared sauna sessions, family wellness routines, or entertaining.
Premium ThermoWood construction, tempered safety glass, integrated ventilation, under-bench LED lighting, and a weather-resistant roof system make the MW20 well suited for permanent outdoor installation and year-round enjoyment.
Important: The MW20 sauna cabin does not include a heater, control system, chimney kit, or sauna stones. These components are sold separately so you can select either an electric or wood-burning configuration.
MW20 Highlights
Spacious Interior
- Comfortable seating for up to six people
- Largest interior and bench area in the MW Series
- Room for relaxing, conversation, and shared wellness sessions
- Tempered glass creates a bright, open atmosphere
- Integrated under-bench LED lighting
Built for Outdoor Living
- Premium ThermoWood wall, roof, and bench construction
- Bituminous roofing system for added weather protection
- Integrated ventilation for proper airflow
- Suitable for year-round outdoor use when properly installed
- Pairs well with cold plunges, pools, and outdoor wellness spaces
Choose Your Heating Configuration
The MW20 can be equipped with an electric heater for everyday convenience or a wood-burning stove for a more traditional sauna experience. The sauna cabin itself is the same, allowing you to select the heating system that best fits your property and preferences.
Electric Sauna Package
The recommended electric configuration combines reliable traditional sauna heat with convenient WiFi-enabled controls.
- Harvia KIP80W 8kW electric sauna heater
- Harvia Xenio WiFi control system
- One box of AC3000 stones required
- A second box of AC3000 stones recommended
- Professional electrical installation required
Wood-Burning Sauna Package
The wood-fired configuration creates an authentic sauna atmosphere with natural radiant heat and traditional stove operation.
- Harvia M3 16.5kW wood-burning sauna stove
- Harvia 1500 mm stainless steel chimney kit
- Two boxes of AC3020 sauna stones required
- Proper chimney and ventilation installation required
- For outdoor sauna installations only
What Is Included
Sauna Structure
- MW20 ThermoWood outdoor sauna cabin
- ThermoWood wall and roof construction
- ThermoWood interior benches
- Tempered safety glass door and windows
- Bituminous roofing system
- Required structural hardware and fasteners
Interior Features
- Upper and lower bench seating
- Seating for up to six people
- Integrated under-bench LED lighting
- Integrated sauna ventilation
- Traditional European sauna room layout
- Natural ThermoWood interior finish
Sold separately: Sauna heater, heater controls, sauna stones, chimney components, electrical work, foundation work, delivery upgrades, and installation services are not included unless specifically stated in your order or custom quote.
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 Heights |
16.5 in lower bench / 34.3 in upper bench |
| Bench Depth |
23.6 in |
| Wall Thickness |
3.5 in |
| Primary Material |
ThermoWood thermally modified wood |
| Glass |
Tempered safety glass door and windows |
| Roof System |
Bituminous roofing tiles |
| Lighting |
Integrated LED lighting beneath the benches |
| Ventilation |
Integrated ventilation system |
| Heater Compatibility |
Electric or wood-burning sauna heater |
| 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 |
Why ThermoWood?
ThermoWood is real wood that has been modified using heat and steam rather than chemical preservatives. The thermal modification process reduces moisture absorption and improves dimensional stability, helping the wood perform more consistently in outdoor sauna environments.
Outdoor Performance
- Improved resistance to moisture absorption
- Reduced tendency to warp, twist, or swell
- Enhanced dimensional stability
- Improved resistance to decay
- Well suited for changing outdoor conditions
Natural Sauna Character
- Warm, premium appearance
- Natural wood grain and character
- Comfortable interior sauna surfaces
- No chemical preservatives used in the thermal process
- Designed for long-term residential enjoyment
European craftsmanship: Each MW20 is handcrafted in Lithuania, combining traditional sauna construction principles with modern outdoor design.
Site Preparation and Installation
The MW20 ships flat-packed and is assembled at the installation site. It must be installed on a stable, level foundation capable of supporting the sauna, heater system, occupants, and applicable environmental loads.
Foundation Planning
- Concrete slab
- Properly engineered structural deck
- Compacted paver foundation
- Properly prepared and reinforced gravel base
- Other stable, level, load-bearing surfaces
Installation Planning
- Confirm freight access before delivery
- Provide adequate drainage around the sauna
- Allow sufficient clearance for assembly and service
- Complete heater and electrical planning in advance
- Use qualified professionals where required by local code
Important: Improper foundations, uneven surfaces, poor drainage, settling, or installation errors can affect door alignment, structural performance, and warranty coverage.
Delivery and Assembly
| Delivery Method |
Freight carrier |
| Shipping Format |
Flat-packed structural components |
| Shipping Weight |
1,565 lbs |
| Shipping Dimensions |
6 ft 7 in × 3 ft 9 in × 3 ft 9 in |
| Assembly |
Required at the installation site |
| Recommended Assembly Team |
At least two capable adults or professional installers |
Delivery inspection: Inspect the shipment before signing the freight receipt. Note visible damage on the delivery paperwork and take clear photographs of any concerns before accepting the shipment.
Warranty Coverage
The MW20 includes a 5-Year Limited Residential Structural Warranty. Warranty terms apply to qualifying residential installations and are subject to proper assembly, site preparation, use, care, and maintenance.
Structural Coverage
- Qualifying structural manufacturing defects
- Qualifying ThermoWood construction defects
- Factory-supplied bench and interior structural defects
- Qualifying factory-installed glass defects
- Qualifying supplied hardware defects
Common Exclusions
- Improper installation or assembly
- Foundation movement or settling
- Improper electrical or chimney work
- Normal weathering or cosmetic wood changes
- Commercial or revenue-generating applications
Heater systems, controls, stones, chimney components, electrical work, and installation services may carry separate warranties or exclusions. Review the full warranty documentation before purchase.
Helpful Planning Resources
MW20 Installation Guide
Review the assembly process, foundation recommendations, component layout, ventilation information, and installation requirements before delivery.
View Installation Guide
Electrical Requirements
Share the electrical planning document with your licensed electrician before installing an electric sauna heater or control system.
View Electrical Requirements
Frequently Asked Questions
Does the MW20 include a sauna heater?
No. The MW20 sauna cabin is sold separately from the heater system. You may choose either an electric or wood-burning configuration.
What electric heater is recommended for the MW20?
The recommended electric setup includes the Harvia KIP80W 8kW electric sauna heater, Harvia Xenio WiFi control, and AC3000 sauna stones.
Can the MW20 use a wood-burning stove?
Yes. The MW20 can be configured with the Harvia M3 16.5kW wood-burning sauna stove, the required chimney system, and AC3020 sauna stones.
How many people can use the MW20?
The MW20 is designed to accommodate up to six people, depending on occupant size and preferred seating arrangement.
Are sauna stones included?
No. Sauna stones are sold separately, and the required stone type and quantity depend on the heater selected.
Can the MW20 remain outdoors year-round?
Yes. It is designed for permanent outdoor installation when assembled on a stable foundation with proper drainage, weather protection, and ongoing care.
Does the MW20 require plumbing?
No. The MW20 does not require water supply lines, drain connections, or other permanent plumbing.
Does the MW20 arrive fully assembled?
No. It ships flat-packed and must be assembled on-site. Large structural components are pre-manufactured to support a more efficient installation.
What makes the MW20 different from the MW16?
The MW20 offers greater seating capacity, more interior bench space, and the ability to use either an electric heater or a traditional wood-burning stove.
Why Buy from My Luxury Home Spa?
As an authorized Mande Spa USA dealer, My Luxury Home Spa can help you plan a complete MW20 sauna system rather than leaving you to determine heater sizing, controls, stones, chimney components, and installation requirements on your own.
Authorized Dealer Support
- Sauna and heater selection assistance
- Electric and wood-burning package guidance
- Installation planning resources
- Warranty claim assistance
- Support before and after delivery
Build a Complete Wellness Space
- Pair the sauna with a cold plunge
- Create a contrast therapy routine
- Integrate it into a pool or patio area
- Add recovery and relaxation products
- Create a dedicated backyard wellness retreat
