Renu Therapy Rusticus 4 Indoor Sauna

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

UsabilityScore

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A four-person indoor sauna cabin in red cedar with a 8 kW stove and app control, rated up to 195°F.

$8,891

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SKU: AH-RU4-CDR Category: Saunas Brand: Renu Therapy

Usability

6.4 out of 10

Temperature10rated up to 195°F by Renu, above the 194°F limit

Note: 195°F is the brand's rating; full heat in about an hour per Renu

Heating / Cooling Power108 kW stove for about 212 cu ft inside (interior width by depth by height)

Stove: Harvia KIP80 with Fenix controller and MyHarvia 2 app

Capacity7four seats

Build & Insulation5solid red cedar, tempered glass door

Walls: 1-3/8 in tongue-and-groove, no added insulation stated

Better on build & insulationRedwood Outdoors Extra-Wide Barrel SaunaThermally modified hemlock. $7,799Scores 9.0

Features & Water Care6app, light, schedule start, backrests

Verification4Harvia's 8 kW KIP heater is UL listed (KPSX.E129791); no listing for the room itself.

Searched: UL Intertek CSA CPSC Health Canada
Record: UL Product iQ, KPSX Sauna Heating Equipment (UL 875); KPSX7 for Canada, KIP-80 (listed as -80-B1, -80-B3, -80-W1, -80-W3) (model list: KIP-30-B1, -45-B1, -60-B1, -80-B1, -30-B3, -45-B3, -60-B3, -80-B3, -30-W1, -45-W1, -80-W1, -30-W3, -45-W3, -60-W3 and -80-W3; K-90..150-F1/F3; JM-17/20/30; KV-45/60/80); row ships 8 kW KIP with Harvia Fenix control, Harvia Finland Oy

Better on verificationSun Home Nova 6 traditional sauna$15,799Scores 6.0

Warranty & Support3heater one year, components five years

Room: limited lifetime on the sauna room

Price

Option: Hem Fir $9,317.00 at renutherapy.com

Strengths

Reaches the full sauna temperature limit
Long benches give four people room
Red cedar cabin with a full glass door
App start and smart scheduling
Backrest lights built in
Choice of stove-heated dry or steam use

Drawbacks

Only a one-year warranty on the KIP unit
Needs an electrician for a dedicated hardwired circuit
No speakers or Bluetooth audio
Returns only unopenedwith a steep restocking fee

Verdict

A roomy, hot indoor cabin for four, with a short heater warranty

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

Show 9 moreShow fewer

Not published by Renu Therapy: emf claimed.

Not checked: No manual or spec sheet is published for this model

At a glance

Harvia Fenix touchscreen
Two 78-inch benches
No floor kit offered

Company

Renu Therapy LLC, founded in 2020 by William Bachand, is based in Costa Mesa, California, and owns the brand.

Where it sells

Renu Therapy sells saunas and cold plunges in the US, from a two-person indoor cabin to an eight-person outdoor barrel.
Its saunas and cold plunges are sold on its own US store at renutherapy.com, which ships them free to the contiguous US.
That store also sells another company's infrared cabins.
No Renu Therapy store or listing was found on Amazon US in November 2026.

Description

The Renu Therapy Rusticus 4 is a four-person indoor sauna cabin in rustic red cedar with a 8 kW KIP electric stove, a Harvia Fenix touchscreen controller and the MyHarvia 2 app. Renu rates it up to 195°F; the interior measures 78¾ by 60¼ by 77⅜ inches, about 212 cubic feet, with two long benches, upper and lower.

Its walls are 1-3/8 inch tongue-and-groove lumber with a full tempered-glass door of about 75¼ by 26 inches, and a dimmable LED light bar sits in the backrest. The stove needs a dedicated 240 V 40 A circuit wired by a licensed electrician; the light plugs into a 110 V outlet.

It weighs about 825 lb assembled, is made for hard floors indoors, and ships unassembled for about six hours of assembly. Hem Fir is an option at $9,317.00. The warranty is a limited lifetime on the room, five years on components and one year on the heater.