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, calming retreat in a dedicated wellness room, luxury bathroom, or home gym. Available in Small, Medium, and Large sizes, 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 at home.
Helpful sauna planning resources: Learn more about choosing the right sauna and preparing your space before you buy.
Need help choosing the right size or floor option? We can help you compare footprints, floor vs no-floor versions, installation options, and site requirements before you order.
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), and 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 strong 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.
Who This Sauna Is Best For
- Homeowners wanting a complete indoor sauna system: A strong fit for buyers who want heater, stones, controls, lighting, and accessories included from the start.
- Luxury bathrooms, wellness rooms, and home gyms: Ideal for indoor spaces where comfort, aesthetics, and consistent heat performance all matter.
- Buyers comparing floor vs no-floor options: Well-suited for shoppers who need flexibility based on existing drainage, tile, or wet-room design.
- Customers who want KOHLER design and engineering: A compelling option for buyers seeking a premium indoor sauna with a refined, modern finish.
What Makes This Different
Available Sizes and Variants
Select your KOHLER C1 Indoor Sauna in Graphite Grey by size, floor option, and installation preference:
-
Small – up to 2 people
- Floor: C1 Indoor Sauna, Small, Floor, Graphite Grey — 39963-1FNC-CGS
- No Floor: C1 Indoor Sauna, Small, No Floor, Graphite Grey — 39963-0FNC-CGS
- Variants: Sauna only or Sauna with installation
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Medium – up to 3 people
- Floor: C1 Indoor Sauna, Medium, Floor, Graphite Grey — 39951-1FNC-CGS
- No Floor: C1 Indoor Sauna, Medium, No Floor, Graphite Grey — 39951-0FNC-CGS
- Variants: Sauna only or Sauna with installation
-
Large – up to 5 people
- Floor: C1 Indoor Sauna, Large, Floor, Graphite Grey — 39950-1FNC-CGS
- No Floor: C1 Indoor Sauna, Large, No Floor, Graphite Grey — 39950-0FNC-CGS
- Variants: Sauna only or Sauna with installation
Explore related sauna collections:
Required Site Components
- Location: Indoor room with proper clearances, ventilation, and moisture-tolerant finishes.
- Foundation: For 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
| Spec | Detail |
|---|---|
| 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 technical manual |
Small — Graphite Grey (up to 2 people)
| Spec | Detail |
|---|---|
| Models | Small, Floor — 39963-1FNC-CGS Small, No Floor — 39963-0FNC-CGS |
| Nominal Exterior Dimensions | Approximately 66 in × 48 in × 87 in |
| Actual Exterior Dimensions | Approximately 65.8 in × 47.8 in × 86.4 in |
| Capacity | Up to 2 users |
| Shipping Weight — No Floor Model | Approximately 694.6 lb |
Medium — Graphite Grey (up to 3 people)
| Spec | Detail |
|---|---|
| Models | Medium, Floor — 39951-1FNC-CGS Medium, No Floor — 39951-0FNC-CGS |
| Nominal Exterior Dimensions | Approximately 78 in × 56 in × 87 in |
| Actual Exterior Dimensions | Approximately 77.6 in × 55.7 in × 86.5 in |
| Capacity | Up to 3 users |
| Shipping Weight — No Floor Model | Approximately 760.7 lb |
Large — Graphite Grey (up to 5 people)
| Spec | Detail |
|---|---|
| Models | Large, Floor — 39950-1FNC-CGS Large, No Floor — 39950-0FNC-CGS |
| Nominal Exterior Dimensions | Approximately 82 in × 80 in × 87 in |
| Actual Exterior Dimensions | Approximately 81.4 in × 79.3 in × 86.4 in |
| Capacity | Up to 5 users |
| Shipping Weight — No Floor Model | Approximately 1124.6 lb |
Compare at a Glance
C1 Size Overview
| Feature | Small | Medium | Large |
|---|---|---|---|
| Capacity | Up to 2 people | Up to 3 people | Up to 5 people |
| Nominal Exterior Size | 66 in × 48 in × 87 in | 78 in × 56 in × 87 in | 82 in × 80 in × 87 in |
| Floor Options | Floor or No Floor | Floor or No Floor | Floor or No Floor |
| Heater | FERO 9.0 kW included | FERO 9.0 kW included | FERO 9.0 kW included |
| Installation Variant | Available | Available | Available |
Confirm final dimensions, floor configuration, and installation variant before ordering.
Site Prep & Installation
- Location: Indoor room with proper clearances, ventilation, and moisture-appropriate finishes.
- Foundation: For floor models, use a level, stable finished surface. For no-floor models, use an appropriate drainable or wet-room-ready base.
- Electrical: Dedicated 240 V, 50 A circuit for the FERO 9.0 kW heater and lighting. Use a licensed electrician and follow local code.
- Access: Ensure clear path for wall panels, glass, and components into the room.
- Alcove installations: Follow KOHLER clearance and ventilation guidance before final placement.
Need help planning your installation? Review our guides for sizing, prep, and what to expect before delivery and assembly.
Support, Warranty, and Buying Confidence
When shopping for a premium indoor sauna, product details matter, but so does support before and after the sale. At My Luxury Home Spa, we help customers compare sizes, understand floor vs no-floor options, review installation readiness, and choose the right sauna for their space and goals.
The C1 is backed by KOHLER warranty coverage and supported by technical guides and model-specific resources. If you have questions before ordering, our team can help you evaluate fit, access, electrical needs, and installation planning.
Why Choose the C1 Indoor Sauna in Graphite Grey?
- Turnkey indoor sauna with heater, stones, lighting, controls, and accessories 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 to fit your layout, drainage needs, and overall project goals.
- 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 full details.
Frequently Asked Questions
Does the C1 Indoor Sauna include a heater and sauna stones?
What is the difference between floor and no-floor models?
Can the C1 Indoor Sauna be installed in an alcove?
Do I need professional installation?
What electrical requirements should I plan for?
Manuals & Documentation
Small — C1 Indoor Sauna Technical Guide
Why Buy From Us
FAQs
Shipping & Delivery
Free shipping available on select orders. White-glove delivery and setup can be arranged at an additional cost 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.
