KOHLER C1 Indoor Sauna in Graphite Grey
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The KOHLER C1 Indoor Sauna in Graphite Grey is a fully engineered indoor sauna kit designed for freestanding or alcove installation. A premium Scandinavian spruce interior pairs with a modern Graphite Grey exterior to create a warm, calm retreat in any dedicated wellness room, luxury bathroom, or home gym. Available in Small (up to 2 people), Medium (up to 3 people), and Large (up to 5 people), the C1 arrives as a complete system that includes a FERO electric sauna heater, sauna stones, heater guard, lighting, accessories, and an external digital control panel.
Thick insulated wall construction, tongue and groove panels, and mineral wool insulation help the C1 retain heat session after session. Inside, the solid obeche bench and matching backrest with warm indirect lighting create a relaxing ambiance that feels like a high end spa, right at home.
Key Features
- Complete indoor sauna package with Graphite Grey exterior and Scandinavian spruce interior
- Three sizes to fit your space: Small (up to 2 users), Medium (up to 3), Large (up to 5)
- Freestanding FERO 9.0 kW electric sauna heater included with sauna stones and heater guard
- Warm white indirect LED lighting behind the backrest for a soft, relaxing glow
- Digital external control panel controls temperature, session time, and backrest lighting
- Dual thermostatic control for safe, consistent, repeatable sauna sessions
- Insulated wall construction with mineral wool and rubber seals for excellent heat retention
- Aerotherm ventilation system supports fresh air and even heat distribution
- Freestanding or alcove installation for flexible layout options
- Floor and no floor versions plus optional installation service available as variants
Available Sizes and Variants
Select your KOHLER C1 Indoor Sauna in Graphite Grey by size, floor option, and installation preference:
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Small – up to 2 people
- Model, Floor: C1 Indoor Sauna, Small, Floor, Graphite Grey – 39963-1FNC-CGS
- Model, No Floor: C1 Indoor Sauna, Small, No Floor, Graphite Grey – 39963-0FNC-CGS
- Variants: Sauna only, or Sauna with installation (for each floor option)
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Medium – up to 3 people
- Model, Floor: C1 Indoor Sauna, Medium, Floor, Graphite Grey – 39951-1FNC-CGS
- Model, No Floor: C1 Indoor Sauna, Medium, No Floor, Graphite Grey – 39951-0FNC-CGS
- Variants: Sauna only, or Sauna with installation (for each floor option)
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Large – up to 5 people
- Model, Floor: C1 Indoor Sauna, Large, Floor, Graphite Grey – 39950-1FNC-CGS
- Model, No Floor: C1 Indoor Sauna, Large, No Floor, Graphite Grey – 39950-0FNC-CGS
- Variants: Sauna only, or Sauna with installation (for each floor option)
Required Site Components
- Location: Indoor room with proper clearances, ventilation, and moisture tolerant finishes.
- Foundation: For full floor models, a level, solid surface such as tile or concrete. For no floor models, a drainable, moisture appropriate surface is recommended.
- Electrical: Dedicated 240 V electrical circuit sized for the FERO 9.0 kW heater and lighting, installed by a licensed electrician according to local code.
- Access: Clear path for bringing wall panels, glass, and components into the installation space.
- With installation variants: Site must be prepared with foundation and electrical rough in complete before installer arrival.
What’s Included
- KOHLER C1 Indoor Sauna cabin in Graphite Grey (Small, Medium, or Large)
- Scandinavian spruce interior wall and ceiling panels
- Front frame, side, and rear wall panels
- Ceiling elements and bottom frame (for floor models)
- Solid obeche wood bench and matching backrest
- Heater safety rail
- Warm white 2700K indirect LED backrest lighting
- Freestanding FERO 9.0 kW electric sauna heater
- Sauna stones sized for the included heater
- Heater guard
- Aerotherm ventilation system
- Tempered glass door and windows with beech wood interior handle and durable exterior handle
- Mineral wool insulation and rubber seals between walls
- Exterior digital control panel with display for temperature, time, and lighting
- Wall mounted thermometer
- Beech wood 20 minute sand timer
- Headrest and stool
- Installation hardware and fasteners
- Installation and operation manual
- 5 year limited consumer warranty (per KOHLER specifications)
- With installation variants: Professional assembly and placement according to KOHLER guidelines
Specifications – Graphite Grey Models
Shared System Specifications
| Interior Material | Scandinavian spruce |
| Exterior Finish | Graphite Grey exterior wall panels |
| Seating and Backrest | Solid obeche wood bench, backrest, headrest, and stool |
| Door and Windows | Approximately 8 mm tempered glass door and side glazing |
| Insulation | Mineral wool insulation between wall panels with rubber seals |
| Heater | FERO 9.0 kW electric sauna heater with stones and guard |
| Electrical Requirement | 240 V, 50 A dedicated circuit (confirm with electrician and manual) |
Small – Graphite Grey (up to 2 people)
| Models | Small, Floor – 39963-1FNC-CGS Small, No Floor – 39963-0FNC-CGS |
| Nominal Exterior Dimensions (W × D × H) | Approximately 66 in × 48 in × 87 in |
| Actual Exterior Dimensions (W × D × H) | Approximately 65.8 in × 47.8 in × 86.4 in |
| Approximate Capacity | Up to 2 users |
| Shipping Weight – No Floor Model | Approximately 694.6 lbs |
Medium – Graphite Grey (up to 3 people)
| Models | Medium, Floor – 39951-1FNC-CGS Medium, No Floor – 39951-0FNC-CGS |
| Nominal Exterior Dimensions (W × D × H) | Approximately 78 in × 56 in × 87 in |
| Actual Exterior Dimensions (W × D × H) | Approximately 77.6 in × 55.7 in × 86.5 in |
| Approximate Capacity | Up to 3 users |
| Shipping Weight – No Floor Model | Approximately 760.7 lbs |
Large – Graphite Grey (up to 5 people)
| Models | Large, Floor – 39950-1FNC-CGS Large, No Floor – 39950-0FNC-CGS |
| Nominal Exterior Dimensions (W × D × H) | Approximately 82 in × 80 in × 87 in |
| Actual Exterior Dimensions (W × D × H) | Approximately 81.4 in × 79.3 in × 86.4 in |
| Approximate Capacity | Up to 5 users |
| Shipping Weight – No Floor Model | Approximately 1124.6 lbs |
Why Choose the C1 Indoor Sauna in Graphite Grey?
- Turnkey indoor sauna with heater, stones, lighting, accessories, and controls included
- Modern Graphite Grey exterior that pairs beautifully with contemporary bathrooms and wellness suites
- Warm spruce and obeche interior for a bright, spa like environment
- Multiple sizes and floor options so you can match your layout, drainage needs, and budget
- Engineered by KOHLER for durability, comfort, and consistent performance
Shipping & Returns
- Shipping Method: Freight delivery with scheduled appointment
- Delivery: Free standard U.S. freight shipping to most locations
- Returns: 14 day return policy on unused, uninstalled units in original packaging (see store policy for details)
Manuals & Documentation
Small – C1 Indoor Sauna Technical Guide
Medium – C1 Indoor Sauna Technical Guide
Large – C1 Indoor Sauna Technical Guide
Frequently Asked Questions
Does the C1 Indoor Sauna include a heater and sauna stones?
Yes. Every C1 Indoor Sauna in Graphite Grey includes a FERO 9.0 kW electric sauna heater, sauna stones, and a heater guard. This is a complete indoor sauna kit, so you do not need to purchase a separate heater unless you want a different configuration.
What is the difference between floor and no floor models?
Floor models include a full sauna floor that sits on your existing surface and provide a more finished, self contained unit. No floor models are designed to sit directly over an appropriate tile or wet room surface and allow water to drain through your existing floor system. Your choice depends on your room design and drainage plan.
Can the C1 Indoor Sauna be installed in an alcove?
Yes. The C1 is engineered for both freestanding and alcove installation. Always follow KOHLER clearance and ventilation guidelines and verify that the surrounding surfaces are appropriate for heat and moisture.
Do I need professional installation?
You can select a “with installation” variant for professional assembly and placement, or a standard kit if you have a preferred contractor or are working with a local installer. In both cases, electrical work and any structural changes must be performed by licensed professionals in accordance with local codes.
What electrical requirements should I plan for?
The FERO 9.0 kW heater and sauna lighting typically require a dedicated 240 V, 50 A circuit. Always review the technical manual for your chosen size and consult a licensed electrician to ensure correct breaker size, wire gauge, and installation method.
Why Buy From Us
FAQs
Shipping & Delivery
Free curbside shipping on all orders. White-glove delivery/setup available at checkout in most areas. We’ll confirm your preferred date after purchase.
Warranty
Full manufacturer warranty, registered at purchase. Need help with a claim? Our U.S. support team handles it directly with the brand.
Returns
New, uninstalled items can be returned within the brand’s policy window. We’ll help coordinate pickup and any restocking requirements.
Installation & Power
Most saunas/hot tubs require dedicated circuits. We provide spec sheets and can recommend licensed installers in your area.
