Redwood Outdoors Sauna Review 2026: Are Thermowood Barrels Worth It?

By IceColdTubs · Updated July 8, 2026

Quick Answer: Redwood Outdoors is worth it if you want a premium outdoor sauna kit that survives real weather — its signature Thermowood (Scandinavian spruce heat-treated at roughly 185–215°C) resists rot and warping better than untreated wood, and every model ships with an ETL-certified Harvia heater that hits 195°F in under an hour, per BarBend’s 2026 review. Expect to pay ~$3,500 for a cedar barrel, $6,600 (+$500 shipping) for a Thermowood barrel, and ~$7,299 for the Cabin — roughly $8,000 all-in once an electrician wires the heater. Skip it if your budget is under ~$3,500 or you want a long structural warranty (Redwood’s is 1 year); our best outdoor sauna kit guide has alternatives at every price.

Redwood Outdoors has become one of the most-shopped names in backyard saunas — and unlike a lot of drop-shipped sauna kits, it’s built a lineup with a genuine engineering angle: heat-treated Thermowood construction, real Finnish Harvia heaters, and kits designed for DIY assembly. We’ve recommended individual Redwood models in our best barrel sauna and best outdoor sauna kit roundups; this review looks at the whole brand — what you actually get, what it costs all-in, and who should buy something else.

Affiliate note: prices fluctuate. We link to live listings so you can check current pricing before you buy.

Redwood Outdoors lineup at a glance (2026)

Redwood Outdoors by the numbers

• Thermowood is kiln-treated at 185–215°C. Per Redwood Outdoors, its Thermowood is Scandinavian spruce/pine heat-treated in steam kilns, which drives out resins, lowers the wood’s equilibrium moisture content, and restructures cell walls so boards absorb and release moisture more slowly — the mechanism behind its warp and rot resistance.
• 195°F in under an hour. BarBend’s 2026 review measured the Harvia KIP heater reaching 195°F in under an hour, with in-sauna humidity between 15 and 25 percent — proper Finnish-sauna territory, not the 130–150°F of many infrared cabins. (Comparing the two? See infrared vs traditional.)
• ~$6,600 buys the flagship, ~$8,000 gets it running. The Extra-Wide Thermowood Barrel lists around $6,600 plus roughly $500 shipping, and BarBend notes that shipping plus electrician fees push the realistic all-in cost to about $8,000. Budget for the electrician up front — the heater must be grounded on its own breaker.
• Cedar starts ~$3,500 — nearly half the Thermowood price. Redwood’s untreated Canadian red cedar barrels start around $3,500, making them the brand’s budget door. Cedar is naturally rot-resistant but not heat-stabilized, so expect more seasonal movement than Thermowood.
• Warranty: 1 year on wood, 5 on heater components. The wooden structure carries a 1-year limited warranty; Harvia heaters get 1 year on elements and 5 years on other components (residential). That structural warranty is short for the price tier — a genuine knock against the brand.
• Heaters are ETL-certified with an 8-hour delay timer. Every Redwood sauna ships with a Harvia electric heater that’s ETL-certified, offers up to an eight-hour delay start, and on some models adds Wi-Fi remote control — set it at lunch, sauna at six.

What Redwood Outdoors gets right

The wood is the product. Most sauna kits at this price use untreated softwood and hope for the best. Thermowood’s heat treatment measurably changes how the boards handle moisture, which is exactly what you want in a structure that lives outside through rain, snow, and summer sun. If your sauna will sit uncovered in a wet or freeze-thaw climate, this is the single best reason to pick Redwood over a cheaper kit.

Real Harvia heaters, not white-label boxes. Harvia is the Finnish benchmark for electric sauna stoves, and getting one included — ETL-certified, delay timer, optional Wi-Fi — removes the most common failure point of budget kits. If you’re comparing stove options across brands, our best sauna heater guide covers the field.

Kits a competent DIYer can actually build. Pre-cut, interlocking panels, no cutting or modification on site, and a claimed few-hours assembly with basic skills. Reviewers consistently say to bring a second person and to treat it as a weekend project rather than an afternoon — but compared with stick-building a sauna, it’s genuinely approachable. See our best outdoor sauna kit guide for how that compares to other kit brands.

What to watch out for

The 1-year structural warranty. For a $6,600 purchase, one year on the wood is thin. Inspect everything at delivery, photograph any shipping damage, and seal or stain exterior surfaces per the manual to keep the finish healthy.

Electrician required — always. The Harvia heater must be wired to its own dedicated, grounded breaker by a licensed electrician. That’s typically a few hundred dollars and is not optional, so fold it into your budget alongside shipping.

Barrel geometry has trade-offs. Barrels heat fast because there’s less air volume, but stadium seating in the Extra-Wide aside, headroom and lounging space trail a square cabin. If you want to lie flat, look at the 8-person barrel (benches long enough to lie down) or the Cabin. Our best barrel sauna guide breaks down barrel vs cabin in detail.

Which Redwood Outdoors sauna should you buy?

Best overall: Thermowood Barrel (2–6 person). The core of the brand — Thermowood durability, Harvia heat, and the classic barrel look, from about $6,600. The Extra-Wide version adds stadium seating for up to six.

Best on a budget: Cedar Barrel. From roughly $3,500, you get the same kit engineering and Harvia heater with untreated cedar. Right pick for drier climates or covered installs where Thermowood’s weather resistance matters less.

Best for views: Thermowood Panorama. The glass back wall (from $6,599, heater-dependent) turns a lake, garden, or mountain backdrop into the sauna’s fourth wall. It’s the design flagship.

Best for groups: 8-Person Barrel or Cabin. The 8-person barrel’s benches are long enough to lie down; the Cabin (~$7,299 with heater) gives a traditional square room that seats a family without barrel curvature.

Best Redwood Outdoors alternatives

Want to spend less than $3,500? A smaller kit brand or a well-priced barrel from our best barrel sauna roundup gets you sweating for less — Almost Heaven and Dundalk both sell strong sub-$5,000 barrels, and true budget options live in our best home sauna guide.

Want indoor or low-power? An infrared cabin runs on a standard outlet and suits apartments and garages — see best infrared sauna. For the cheapest way to sweat at home, a sauna blanket starts under $200.

Building a full hot-cold setup? Redwood also makes the Alaskan cold plunge line we mention in our Ice Barrel review — pairing a sauna with a plunge is the classic contrast protocol. Start with sauna vs cold plunge and our best cold plunge & sauna combo guide.

How to decide

1. Match the wood to your climate. Wet, snowy, or freeze-thaw climate and an uncovered install → Thermowood. Dry climate or covered patio → cedar saves you ~$3,000.

2. Price the whole project. Kit + ~$500 shipping + electrician + a gravel or paver pad. On a Thermowood barrel, that’s realistically ~$8,000 — if that number works, Redwood is competitive; if not, drop to cedar or a smaller kit.

3. Pick capacity by how you’ll actually sit. Solo or couples → a 2-person barrel (see best 2-person saunas). Family or entertaining → Extra-Wide, 8-person, or Cabin.

4. Kit out the interior on day one. A thermometer/hygrometer, bucket and ladle, and a backrest cost little and make the first session feel finished.

The bottom line

Redwood Outdoors earns its premium when the sauna will live outdoors in real weather: kiln-treated Thermowood at 185–215°C, ETL-certified Harvia heaters that hit 195°F in under an hour (per BarBend’s 2026 review), and DIY-friendly interlocking kits are a genuinely strong combination at ~$6,600 for the flagship barrel. The short 1-year structural warranty and the ~$8,000 realistic all-in cost are the honest caveats. If the budget fits, buy the Thermowood Barrel; if it doesn’t, the cedar barrel (~$3,500) or an alternative from our best outdoor sauna kit guide keeps the löyly without the flagship price.