Mande MW20 ThermoWood Outdoor Sauna | 5–6 Person, Tempered Glass, LED Under-Bench, Choice of Heater | Free Shipping
Mande MW20 ThermoWood Outdoor Sauna | 5–6 Person, Tempered Glass, LED Under-Bench, Choice of Heater | Free Shipping
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The Mande MW20 is the largest sauna in the Mande ThermoWood outdoor lineup — 5–6 person capacity with tempered glass doors and windows, LED under-bench lighting, an integrated ventilation system, and ThermoWood construction throughout. It is available in four heater configurations, including a Harvia M3 wood burner with a full chimney set. Lava rocks are included with every configuration, starting at $8,999.
Why Customers Choose This Product
- 5–6 person capacity — the largest interior in the Mande lineup, with bench space for family and group use
- ThermoWood construction, exterior and interior — thermally modified wood built for outdoor use
- Tempered glass doors and windows — safety glass that brings natural light and outdoor views into the interior
- LED under-bench lighting — low-level ambient light from beneath the benches, without overhead glare
- Integrated ventilation system — manages fresh air exchange at full occupancy
- Four heater configurations — Harvia KIP electric (built-in or WiFi control) or the Harvia M3 wood burner with a full chimney set
Product Highlights
5–6 Person Capacity
The MW20 is built for group use — 5–6 person bench capacity with the interior volume, heater output options, and ventilation to match. It is the appropriate Mande model when the MW16's capacity is not sufficient for your household or intended use pattern.
Tempered Glass Doors and Windows
Tempered glass is safety glass: heat-treated to be significantly stronger than standard glass and, if broken, it fractures into small rounded pieces rather than sharp shards. The combination of a glass door and glass windows gives the MW20's interior a light, open feel while maintaining a visual connection to the surrounding outdoor space.
LED Under-Bench Lighting
The MW20's LED lighting is positioned under the benches rather than overhead, creating low-level ambient lighting from below. It illuminates the interior without glare and emphasizes the wood grain of the benches and walls, for evening use and low-light conditions.
Integrated Ventilation
The MW20 includes an integrated ventilation system for fresh air exchange during use. At full occupancy, six people produce a significant heat and humidity load; the integrated system manages fresh air exchange without disrupting the heat envelope, maintaining both air flow and temperature.
Harvia M3 Wood Burner Option
One configuration includes the Harvia M3 wood-burning sauna heater with a full chimney set — the configuration in the Mande lineup that does not require an electrical circuit for the heater. You load firewood and heat the sauna through combustion rather than electric resistance; heat-up takes longer and requires tending the fire. The chimney set is the complete installation package, with no additional chimney components required. Site preparation for chimney clearance and ash management is still required.
ThermoWood Construction
ThermoWood is softwood heat-treated in a controlled high-temperature process without chemical additives. The treatment reduces the wood's moisture absorption, improving resistance to warping, cracking, decay, and insects compared to untreated softwood — a practical specification for a structure that cycles repeatedly between high heat and ambient outdoor conditions.
Specifications
| Brand | Mande Sauna |
|---|---|
| Model | MW20 |
| Construction | ThermoWood — thermally modified wood, exterior and interior |
| Capacity | 5–6 people |
| Weight | 376 lbs |
| Glass | Tempered glass doors and windows |
| Lighting | LED under-bench ambient lighting |
| Ventilation | Integrated ventilation system |
| Benches | Ergonomic |
| Heater Options | Four configurations — Harvia KIP electric (built-in or WiFi controller) or Harvia M3 wood burner with full chimney set; see variant selector |
| Stones | Lava rocks included |
| Use | Outdoor, year-round |
| Starting Price | $8,999 |
Ideal For
- Households and groups who need genuine 5–6 person bench capacity
- Buyers who want tempered glass, under-bench lighting, and integrated ventilation in one structure
- Those who want the option of wood-fired heat with no electrical circuit for the heater (Harvia M3 configuration)
- Year-round outdoor sauna use on a prepared backyard site
Important Information
Select your heater configuration from the variant selector before adding to cart — the wood burner variant is a different heater type (wood-fired vs. electric), so confirm your preference before ordering.
Electric configurations: the Harvia KIP requires a dedicated 240V outdoor-rated circuit installed by a licensed electrician. Confirm the amperage for your chosen output before ordering. WiFi configurations require a 2.4GHz WiFi network within range of the installation site.
Wood burner configuration: no electrical circuit is required for the heater, but chimney clearances and ash management site preparation are required. Confirm local fire code requirements before ordering.
Freight delivery: at 376 lbs, this sauna ships freight. A responsible adult must be present at delivery. Confirm driveway and gate access before ordering.
A level, solid foundation surface is required; site preparation is not included. Assembly is required on site; a detailed assembly guide is included. A permanent outdoor structure with an electrical or wood-burning installation will likely require a building permit — verify before ordering.
Free shipping is available on this item.
Frequently Asked Questions
How does the MW20 differ from the MW12 and MW16?
The MW20 is the largest Mande model at 5–6 person capacity. It adds tempered glass doors and windows (vs. large windows on the MW12 and MW16), LED under-bench lighting (vs. standard LED), an integrated ventilation system, and the Harvia M3 wood burner option, which is not available on the smaller models. All three models use the same ThermoWood construction.
What is the Harvia M3 wood burner and how is it different from electric?
The Harvia M3 is a wood-burning sauna stove — you heat the sauna by burning firewood rather than electric resistance, so no 240V electrical circuit is required for the heater. Heat-up takes longer and requires active fire tending. The full chimney set is included in the $11,042 variant — no additional chimney components are required. Chimney clearances and ash management site preparation are required.
Which heater configuration should I choose for the MW20?
Four configurations are available, from the $8,999 Standard configuration to the Harvia M3 wood burner at $11,042, with Harvia KIP electric options (built-in or WiFi controller) in between — see the variant selector for the configuration and price of each. For a 5–6 person interior at regular group use, a higher-output electric configuration is the practical choice; choose the M3 if you want wood-fired heat and do not want to run a 240V circuit to the sauna location.
Does the sauna come with lava rocks?
Yes — lava rocks are included with all four configurations.
The Mande MW20 is the outdoor ThermoWood sauna built for 5–6 people — tempered glass, under-bench LED lighting, integrated ventilation, and your choice of Harvia electric or wood-burning heat, starting at $8,999.
This product is a recreational sauna and is not a medical device. It is not intended to diagnose, treat, cure, or prevent any disease or health condition. Consult your physician before using a sauna if you are pregnant, have a medical condition, or take medication. Stop use and seek medical advice if you feel unwell at any point.
