Kohler C1 Indoor Sauna

The C1's ready-to-install design features premium Scandinavian Spruce construction with 2.1" mineral wool insulation for superior heat retention and energy efficiency. The FERO electric heater provides precise temperature control, while the Aerotherm ventilation system ensures optimal air circulation throughout every session. Tempered glass doors and windows open the interior visually, and 2700K warm white LED lighting creates a calm, spa-quality ambiance. Obeche wood benches provide a smooth, comfortable seating surface. Available in three sizes to suit any household, and professional installation packages are available for expert setup.

Key features

• Premium indoor sauna, 3 sizes available
• Scandinavian Spruce wood interior and exterior
• Obeche wood benches
• FERO electric heater, 4.5kW or 9kW depending on size
• Tempered glass doors and windows
• 2.1" mineral wool insulation for superior heat retention and energy efficiency
• 2700K warm white LED lighting
• Digital control panel
• Aerotherm ventilation system
• Ready-to-install kit
• Handcrafted in Scandinavia
• 5-year limited warranty (consumer use)
• Professional installation packages available

Brand: Kohler
Model: C1
SKU: 38440-0FNC-SPS
Origin: Handcrafted in Scandinavia
Interior / Exterior: Scandinavian Spruce wood
Benches: Obeche wood
Doors / Windows: Tempered glass
Insulation: 2.1" mineral wool
Heater: FERO electric, 4.5kW or 9kW
Control: Digital control panel
Ventilation: Aerotherm system
Lighting: Warm white LED, 2700K
Warranty: 5-year limited (consumer use)

Available sizes

Small: 2-person capacity, 4.5kW heater
Medium: 3-person capacity, 4.5kW heater
Large: 5-person capacity, 9kW heater

• Complete sauna kit (size-specific)
• FERO electric heater (4.5kW or 9kW)
• Digital control panel
• Tempered glass doors and windows
• Obeche wood benches
• Warm white LED lighting (2700K)
• Aerotherm ventilation system
• Installation instructions
• 5-year limited warranty

The C1 arrives as a ready-to-install modular kit with detailed installation instructions included. The modular design allows for flexible placement in a variety of indoor spaces. Professional installation packages are available for purchase and provide expert setup to ensure optimal performance. A dedicated electrical circuit is required for the FERO heater; refer to the installation manual for specific electrical requirements based on your selected size. Installation by a licensed electrician is recommended.

Installation Manual - 2 Person Sauna

Installation Manual - 3 Person Sauna

Installation Manual - 5 Person Sauna

Readiness Guide

5-year limited warranty for consumer use. Covers manufacturing defects in materials and workmanship under normal residential use. Does not cover damage from improper installation, misuse, neglect, or unauthorized modifications. Contact support@marterraelements.com with your order number, photos, and a description of the issue. We aim to respond within 2 to 3 business days. Warranty is non-transferable and requires original proof of purchase.

Kohler Warranty

Please contact support@marterraelements.com for shipping details and lead times on the Kohler C1, as rates and delivery logistics vary by size and location. Returns are accepted within 30 days of delivery and require prior approval before anything is sent back. Items must be unused, undamaged, and in their original condition with original packaging intact. For additional details, please visit our Return & Refund page.