Redwood Outdoors Retreat Indoor Sauna 4-Person

  • Electric stove
  • 4 people
  • Up to 186-194°F
  • 240V hardwired

SVT Score, Mid

Versus
5.8
SVT SCORESRead review

A four-person indoor sauna in thermally modified hemlock with a 6 kW Harvia stove and two bench levels.

$4,999

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SKU: SN-IBU-H4K001F Category: Brand:

Usability

5.8 out of 10
  • Walls: 1.25-inch boards, no insulation stated
  • Searched: UL Intertek CSA CPSC Health Canada
  • Record: UL Product iQ, KPSX Sauna Heating Equipment (UL 875), holder-level row (abridged guest view shows no model); harvia.com lists 'Certificates UL' for KIP JH60BU1UL / JC60B2401, Harvia Finland Oy
  • Other heater parts: Harvia covers parts other than the elements for five years, residential
  • Option: Flat floor $299.00 at redwoodoutdoors.com

Strengths

  • Reaches the full sauna temperature limit
  • Two-level benches give a hotter top seat
  • Thermally modified hemlock throughout
  • Large side window opens up the room
  • FSC-certified timber from managed forests

Drawbacks

  • Needs a hardwired high-voltage line and an electrician
  • Short warranty with labour not covered
  • Insulation is not stated by the maker
  • Store pages make wellness claims we do not assess
Verdict

A roomy indoor sauna for four, but plan for an electrician

Social score

5.0 out of 10
RedditBrand-level4 out of 10
  • r/Sauna: a cube buyer reports missing parts, unclear instructions and broken screws, then daily use once it was built (Feb 2021)
  • r/Sauna: in a thread on the 4-person Cabin, one owner reports excellent support and others warn about service (Jan 2024)
  • r/Sauna: an upper-Midwest owner of a 4-person model says it held heat on a single-digit night and was easy to build (Mar 2025)
GoogleBrand-level6 out of 10

Forbes Vetted names the Haven its best home sauna overall and the Cabin its best traditional outdoor sauna (May 2026)|Garage Gym Reviews names the Duo its best outdoor home sauna at 3.9 of 5 (Jan 2026)|BarBend tested the earlier Thermowood Garden and calls the assembly complex but the heat strong (Nov 2023)

YouTubeNot scored

The YouTube pool is blank: the testers found either repeat a written review already counted in the Google pool or carry a Redwood affiliate code (November 2026).

AmazonNot scored

The Amazon pool is blank: no Amazon US listing of a Redwood Outdoors sauna was found (November 2026).

User reviewsNot scored

The retailer pool is blank: no Walmart, Home Depot, Lowe's, Best Buy, REI or Costco listing of its saunas or plunges was found (November 2026).

Trustpilot

Trustpilot shows 4.2 from 187 reviews, 70% five-star and 12% one-star, on a claimed page that invites reviews (April 2026).

Track record
  • BBB rates the business B and not accredited, with 8 complaints in three years (November 2026).
  • No CPSC or Health Canada recall naming its saunas or cold plunges was found (November 2026).
Not countedExcluded
  • Not counted in any pool: the brand's own store reviews, its YouTube channel, its ambassadors and any page carrying its affiliate codes.
  • The retailer pool is blank: no listing of this sauna was found at Walmart, Home Depot, Lowe's, Best Buy, REI or Costco (November 2026).

Specs

  • TypeTraditional
  • HeaterElectric stove
  • FormCabin
  • PlacementIndoor
  • Seats4 people
  • Max Temperature186-194°F
  • Min TemperatureNot applicable
  • Capacity (Gallons)Not applicable
  • ChillerNot applicable
  • HeatsNot applicable
  • Water CareNot applicable
  • Power Supply240V hardwired
  • EMF MeasuredNot measured
  • CertificationsComponent listing only
  • Warranty1 Year

Not published by Redwood Outdoors: emf claimed.

Not checked: The price of each heater upgrade

At a glance

  • Felt sauna hat
  • Towel peg
  • Ships in a wooden crate
  • Red Rock Outdoors Co., a Wyoming corporation, trades as Redwood Outdoors under its terms of service.
  • The company is based in Kent, Washington, where it keeps its warehouse.
  • The REDWOOD OUTDOORS trademark, registration 7319444, belongs to Red Rock Outdoors Co. of Tukwila, Washington.
  • Redwood Outdoors sells saunas and cold plunges from a two-person indoor cabin to an eight-person outdoor sauna and two heated cold plunges.
  • The brand sells through its own online store, showrooms in Seattle, Santa Monica and Salt Lake City, and a few dealers that display its saunas.
  • No Redwood Outdoors store or listing was found on Amazon US in November 2026.

The Redwood Outdoors Retreat is a four-person indoor sauna in thermally modified Canadian hemlock with two bench levels, a large side window and a tempered glass door. It comes with a 6 kW Harvia KIP electric stove and its stones, and the maker rates its heaters to 194°F.

The stove has manual dials with a delay timer of up to 8 hours and must be hardwired to a 240 V, 30 A circuit by a licensed electrician. It measures 52 by 76.4 by 79.5 inches outside, gives 156.4 cubic feet inside, has 1.25-inch walls and weighs 1,000 lb.

A towel peg, a doormat and a felt sauna hat come with it, and a flat floor costs $299.00.

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