The Kohler C2 Outdoor Sauna brings the ritual of traditional Finnish-style bathing into your backyard with the premium materials, refined engineering, and meticulous finish you expect from a brand with 150+ years of wellness heritage. Available in 3-, 5-, and 6-person configurations, the C2 is built for year-round outdoor use with a freestanding installation that adapts to any yard or garden setting.
Douglas Fir outside, Scandinavian spruce inside
The exterior is clad in Douglas Fir, a naturally dense and weather-resistant wood with a warm, organic aesthetic that looks at home in any outdoor setting. Inside, premium Scandinavian spruce walls create a bright, welcoming atmosphere from the moment you step in. The obeche wood bench and matching backrest are paired with 2700K warm white indirect lighting positioned behind the seat soft, ambient illumination that never competes with the heat for your attention.
Built for serious outdoor heat retention
The C2 does not cut corners on thermal performance. Tempered glass door and windows pair with 2.1" thick mineral wool insulation between the wall sections and rubber seals at every joint, creating a tight thermal envelope for consistent, long sessions. Extended roof eaves protect the structure from direct rain and snow, and a triple-insulated roof with two layers of mineral wool, an air gap, and a waterproof EPDM membrane prevent heat loss from above. The FERO electric heater with sauna stones and heater guard delivers authentic traditional heat and dual thermostatic control keeps every session safe and repeatable.
Smart controls and ventilation done right
An externally mounted digital control panel handles temperature, session time, and backrest lighting adjustable without interrupting your session. The panel features a lockable cover that protects it from the elements and unauthorized use between sessions. The Aerotherm ventilation system maintains a steady supply of fresh oxygen and proper air exchange throughout, keeping the air breathable even at peak heat. The C2 is designed for freestanding installation, providing full flexibility for placement in any outdoor space.
Premium Douglas Fir exterior, Scandinavian spruce interior, and a FERO electric heater included the Kohler C2 delivers traditional outdoor sauna performance in 3-, 5-, and 6-person sizes, with mineral wool insulation, tempered glass, Aerotherm ventilation, and a triple-insulated roof. Backed by Kohler's 150+ year heritage and 5-year limited warranty.
3, 5, or 6 person sizes Year-round outdoor use Douglas Fir exterior FERO electric heater included Tempered glass door & windows Freestanding installation 5-year limited warranty Authorized Kohler dealer
Specifications
3-Person dimensions (K-39167)
| Width |
100-7/8" (2,562 mm) |
| Depth |
85-1/4" (2,165 mm) |
| Height |
90-3/8" (2,295 mm) |
| Capacity |
Up to 3 people |
5-Person dimensions (K-40045)
| Width |
108-3/4" (2,762 mm) |
| Depth |
100-7/8" (2,562 mm) |
| Height |
90-3/8" (2,295 mm) |
| Capacity |
Up to 5 people |
6-Person dimensions (K-40046)
| Width |
116-5/8" (2,962 mm) |
| Depth |
108-7/8" (2,765 mm) |
| Height |
90-3/8" (2,295 mm) |
| Capacity |
Up to 6 people |
Construction & materials
| Exterior walls |
Douglas Fir |
| Interior walls |
Premium Scandinavian spruce |
| Bench & backrest |
Obeche wood |
| Door & windows |
5/16" (8 mm) tempered glass |
| Heater safety rail |
Obeche wood |
| Insulation |
2.1" (5.4 cm) mineral wool |
| Roof |
Triple-insulated (mineral wool × 2, air gap, EPDM membrane) |
| Lighting |
2700K warm white indirect |
| Ventilation |
Aerotherm system |
Electrical & heater
| Heater |
FERO freestanding electric |
| Heater output (3-person) |
4.5 kW |
| Heater output (5/6-person) |
9.0 kW |
| Heater fuel |
Electric |
| Heater voltage |
220–240V |
| Heater frequency |
50/60 Hz |
| Control |
External digital panel (lockable cover) |
| Thermostatic control |
Dual thermostatic |
Installation & outdoor specs
| Installation method |
Freestanding |
| Use |
Outdoor, year-round |
| Roof protection |
Extended eaves + EPDM waterproof membrane |
| Exterior lighting |
Included - surrounds cabin |
| Certification |
UL Certified |
| Installation |
DIY or Professional |
3-Person (K-39167)
5-Person (K-40045)
6-Person (K-40046)
What's included
Front frame panels
Side wall panels
Rear wall panels
Ceiling elements
Bottom frame
Backrest
Benches
FERO electric sauna heater
Heater guard
Sauna stones
Digital control panel
Lockable control panel cover
Indirect lighting (2700K)
Exterior ambient lighting
Triple-insulated roof
Extended roof eaves
Wall-mounted thermometer
Beech 20-minute hourglass timer
Headrest
Stool
Installation hardware
Installation & operation manual
Why the Kohler C2 stands out
Douglas Fir exterior
Naturally dense and weather-resistant cladding with a warm, organic aesthetic. Built to hold up across every season outdoors with no special upkeep required.
FERO electric heater
Freestanding FERO heater with sauna stones and heater guard included. Traditional Finnish-style heat powerful, reliable, and ready to use from day one.
Indirect 2700K lighting
Warm white indirect lighting positioned behind the backrest creates a gentle, relaxing atmosphere never harsh, never distracting from the session.
Triple-insulated roof
Two layers of mineral wool, an air gap, and a waterproof EPDM membrane prevent heat loss overhead and protect the cabin in rain, snow, and extreme cold year-round.
Mineral wool insulation
2.1" thick mineral wool between every wall section, paired with rubber seals at all connection points, locks heat in for consistent thermal performance session after session.
Aerotherm ventilation
Engineered airflow keeps oxygen levels adequate and air exchange consistent throughout. Air stays breathable even at peak heat stay in longer, feel better.
About Kohler
Heritage you can trust
150+ years of bathroom and wellness craftsmanship
Founded in 1873, Kohler is one of the most recognized names in bathrooms, wellness, and home design worldwide. The C2 Outdoor Sauna brings that heritage of premium materials, refined engineering, and meticulous finish into your backyard combining the timeless ritual of traditional Finnish-style heat with the contemporary build quality Kohler is known for.
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Douglas Fir exterior natural weather resistance, organic aesthetic, no seasonal treatment needed
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FERO electric heater included sauna stones, heater guard, traditional authentic heat from day one
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Mineral wool insulation 2.1" between every wall section for superior heat retention
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Aerotherm ventilation consistent airflow, consistent comfort throughout every session
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5-year limited warranty backed directly by Kohler Co.
About Kohler
Built for the outdoors, engineered for performance
Kohler designs every product with the same philosophy: premium materials, considered engineering, and finishes that last. The C2 Outdoor Sauna is no exception it is a wellness fixture built to a high standard but designed for the realities of backyard installation, daily use, and long ownership in real outdoor conditions.
From the triple-insulated roof and extended eaves to the lockable digital control panel and UL Certification, the C2 represents what happens when a brand with deep heritage takes the outdoor sauna category seriously: a product that is weather-ready, beautiful, and built to outlast every season.
Manuals & Documents
Everything you need before and after installation
Download the official Kohler C2 Outdoor Sauna manuals, spec sheets, and warranty documentation below. The Installation and Operation Manual is the most important review it before your delivery arrives so you know exactly what to expect on installation day. A licensed electrician is required for the heater connection.
Installation & Operation Manuals
Spec Sheets - Douglas Fir
Additional Documents
Warranty
Kohler 5-year Limited Warranty
Every Kohler C2 Outdoor Sauna is backed by Kohler's 5-year limited warranty for residential use, covering defects in materials and workmanship from the date of purchase as long as the original purchaser owns the product. The warranty applies to residential installations in the United States and Canada only. Kohler accessories included with the sauna are covered for 1 year under the same terms. Kohler will, at its election, repair or replace defective product covered by the warranty when inspection discloses defects occurring under normal usage. Damage caused by accident, misuse, abuse, improper installation, commercial use, weather events, saltwater corrosion, or failure to follow manufacturer guidelines is not covered. Proof of purchase from an authorized dealer is required for any claim and we are an authorized Kohler dealer.
