Redwood Outdoors Duo Review: Small Sauna, Big Caveats
Redwood Outdoors Duo review: a 2-person Thermowood cube with a Harvia heater included. Owners report happy daily use, cracked trim in rainy climates, and uneven heat with oversized heaters.
The Redwood Outdoors Duo is the most complete small outdoor sauna, a 2-person Thermowood cube with a 6kW Harvia included for about $5,900, but its one-year warranty and owner reports of weathering and uneven heat keep it from the top spot.
- Best for
- A compact traditional sauna for small yards
- Skip it if
- A long structural warranty matters to you. One year is short for a $6,000 purchase.
- Price
- About $5,900 (heater included)
Redwood Outdoors Duo specs
| Type | Traditional, 6kW Harvia KIP heater (included) |
|---|---|
| Capacity | 2 people |
| Max temperature | Traditional heat (owners report holding ~180°F) |
| Power | 240V (heater, electrician install) + 120V for lighting |
| Warranty | 1-year limited on sauna; Harvia: 1 year elements, 5 years other parts |
| Price | About $5,900 (heater included) (checked October 2026) |
| Size | 62¾″L × 50¾″W × 82¾″H |
What we like
- Heat-treated Thermowood resists rot and warping
- 6kW Harvia heater included
- Small footprint for patios and small yards
- Responsive customer service (4.3/5 on Trustpilot)
What we don't
- Only a 1-year warranty on the structure
- Low ceiling limits how high you can raise the bench
- Owners say the roofing instructions are confusing
The Redwood Outdoors Duo is a two-person outdoor cube sauna in Canadian Thermowood (heat-treated hemlock) that ships with a 6kW Harvia KIP heater. As of October 2026, it costs about $5,900. That makes it the most complete small sauna we cover, because the heater is in the box. Owner reports split clearly: one daily user in a cold climate is happy six months in, while others report weathering and uneven heat.
Is the Redwood Outdoors Duo worth it?
The Redwood Outdoors Duo is worth it if you want a compact, complete traditional sauna and accept a one-year warranty. If a long warranty matters more than convenience, the SaunaLife CL3G is the stronger small cube.
Great for
- Couples with small yards or patios
- Buyers who want the heater included
- Daily users in cold climates (one owner’s six-month experience)
Skip it if
- You live somewhere very wet and want a lifetime warranty. See the SaunaLife CL3G.
- You’re tall. The low ceiling limits bench height.
Heat and performance
The Redwood Outdoors Duo comes with a 6kW Harvia, and owners suggest that’s the right size. A cold-climate owner who chose an 8kW upgrade “probably could have gotten away with a 6kW”, and normally leaves the heater on high. Their partner turns it down without complaint.
Bigger isn’t better here. Another owner with an 8kW heater, installed by a licensed electrician with the sensor lowered, can sometimes reach 200°F but can’t hold it, and temperatures are uneven. A commenter explained the heater was likely short-cycling because the room is so small, and that the single layer of thin planks doesn’t insulate much.
Size, power and installation
The Redwood Outdoors Duo measures 62¾″ L × 50¾″ W × 82¾″ H with trim and weighs around 600 lb assembled. It needs 240V for the heater (electrician installed) and 120V for lighting. One owner skipped the supplied light and used a floodlight instead, to avoid running more conduit.
Delivery took 10 weeks for one owner and close to four months for another. Redwood drops a pallet in your driveway, so plan to carry every piece to the site.
Build quality and durability
The Redwood Outdoors Duo is mostly tight. One owner found only a single visible crack above the door after six months. But a Portland owner, after a year of heavy rain and snow, reports the exterior trim chipping and cracking, and the heater pulling away from the wall as its mounting screws popped out. In wet climates, treat the exterior regularly and check the heater fixings.
Features and extras
- 6kW Harvia KIP heater and rocks included
- Heater upgrades: 8kW KIP and KIP Wi-Fi, Harvia Spirit Wi-Fi, 9kW Homecraft
- Asphalt roll roofing (about $99 extra on some listings)
- Thermowood exterior with a dark heat-treated finish
What owners say
- Happy daily use: six months of daily sessions in a cold climate, with an outdoor shower and DIY cold plunge.
- Heat: the 6kW is adequate, and oversizing can cause uneven heat.
- Weathering: trim cracking after a year in Portland rain.
- Headroom: a 6’1” owner could raise the bench only about 7 inches before the ceiling got in the way.
- Cost: about $6k kit plus about $1k for the electrical hookup.
Warranty and customer service
Redwood Outdoors offers a 1-year limited warranty on the Duo. Harvia warrants the heater separately (typically 1 year on elements, 5 years on other components). Redwood holds 4.3/5 on Trustpilot from about 359 reviews, with praise for responsiveness and criticism of roofing instructions and backorders.
Price and total cost
| Cost | Typical amount |
|---|---|
| Duo with 6kW Harvia | About $5,899 |
| 240V electrical + permit | $500–$2,500 (one owner: about $1,000) |
| Base | $300–$1,500 |
| Roofing (if not included) | About $99 |
| Typical total | $6,700–$10,000 |
Redwood Outdoors Duo vs SaunaLife CL3G
The SaunaLife CL3G is a similarly sized two-person cube with thermo-spruce, a full glass front and a lifetime warranty, for about $4,000 plus a heater. Totals end up close. Choose the Duo for convenience and the CL3G for warranty and materials. Read our SaunaLife CL3G review.
Final verdict
The Redwood Outdoors Duo is the easiest small sauna to get running, since the heater is included and it fits a tight footprint. Stick with the included 6kW heater, keep the exterior treated, and inspect the kit on delivery. If a long warranty matters to you, the SaunaLife CL3G is the safer bet.
How we rated the Redwood Outdoors Duo
Our rating is based on verified specifications and owner reports, not hands-on testing. How we research and score.
| Heat and performance | 3.8 | |
|---|---|---|
| Build quality and owner-reported reliability | 3.6 | |
| Ease of setup and installation | 4.1 | |
| Warranty and customer service | 3.4 | |
| Value for money | 4.1 | |
| Overall | 3.8 |
Featured in: Best home saunas · Best outdoor saunas
Redwood Outdoors Duo FAQ
Does the Redwood Outdoors Duo include a heater?
Yes. The Duo ships with a 6kW Harvia KIP heater, with upgrades available to 8kW KIP, Harvia Spirit Wi-Fi and 9kW Homecraft heaters.
Should I upgrade the Redwood Duo to an 8kW heater?
Usually not. A cold-climate owner said 6kW would have been enough, and another owner with an 8kW heater struggled to hold even temperatures. A commenter suggested it was short-cycling in such a small space.
How big is the Redwood Outdoors Duo?
The Duo measures 62¾ inches long by 50¾ inches wide by 82¾ inches tall with trim, and assembled it weighs around 600 lb.