Full Spectrum Infrared Sauna | Finnmark FD-5 Trinity 4-Person 3-in-1

Full-Spectrum Infrared + Traditional Steam + Red Light Therapy | 240V | ETL Certified

The Finnmark FD-5 Trinity is the flagship of the Finnmark lineup — a spacious 4-person indoor combination sauna that brings together full-spectrum infrared heating, a 4.5kW traditional electric sauna heater with stones, and an integrated red light therapy system, all in one beautifully crafted cabin. Use each system independently or combine them for a fully customized sauna experience.

With a Western Canadian Cedar interior, Thermo-Aspen exterior, built-in touchscreen controls, Bluetooth audio, and ETL safety certification, the FD-5 Trinity is built for buyers who want the most complete home sauna experience available.

Who This Is For

• Indoor residential sauna installation
• Families or households wanting a 4-person sauna
• Buyers who want infrared, traditional steam, and red light therapy in one unit
• Home wellness spaces requiring maximum flexibility
• Buyers who want the most complete Finnmark sauna experience

Why Choose the FD-5 Trinity

• 3-in-1 combination — full-spectrum infrared, traditional steam, and red light therapy in one cabin
• 4-person capacity — the largest Finnmark indoor sauna
• Each system independently controlled or combined for a customized session
• 4.5kW traditional heater with stones included — pour water for authentic Finnish steam
• Western Canadian Cedar interior for warmth and natural beauty
• Built-in touchscreen with Wi-Fi and Bluetooth audio
• ETL safety certified

Heating & Therapy Systems

• Infrared: Spectrum Plus™ short-wave heaters + Carbon 360° long-wave panels (2,700W, up to 170°F)
• Traditional: 4.5kW electric sauna heater with stones (up to 190°F) — pour water over stones for Finnish-style steam
• Red Light: Integrated red light therapy system (independent control)
• All three systems may be used individually or in combination

Key Features

• 4-person indoor 3-in-1 combination sauna
• Spectrum Plus™ short-wave infrared heaters
• Carbon 360° long-wave infrared panels
• 4.5kW traditional electric sauna heater with stones
• Integrated red light therapy system
• Each system independently controlled or combined
• Built-in touchscreen control panel with Wi-Fi connectivity
• Bluetooth-enabled audio system with speakers
• Interior lighting system
• Two-tier bench seating
• Tempered glass door
• Western Canadian Cedar interior
• Thermo-Aspen exterior
• ETL safety certified
• Designed for indoor residential use only

Specifications

• Brand: Finnmark Designs
• Model: FD-5 Trinity
• SKU: FD-KN005
• GTIN/Barcode: 810127972117
• Capacity: Up to 4 persons
• Intended Use: Indoor residential only
• Voltage: 240V
• IR Watts: 2,700W
• Traditional Heater: 4.5kW
• Phase: Single Phase
• Maximum Temperature: IR up to 170°F / Traditional up to 190°F
• Room Volume: 130 cu. ft.
• Product Weight: 575 lbs
• Shipping Weight: 840 lbs

What's Included

• Finnmark FD-5 Trinity sauna cabin components
• Spectrum Plus™ & Carbon 360° infrared heating components
• 4.5kW traditional electric sauna heater
• Sauna stones
• Integrated red light therapy system
• Touchscreen control panel with Wi-Fi
• Bluetooth audio system and speakers
• Interior lighting system
• Installation hardware
• Manufacturer documentation

Shipping & Delivery

Free freight shipping is included for delivery within the contiguous United States. In-stock orders typically ship within 4–7 business days. This product is currently on backorder with an estimated ship date of August 14, 2026 — orders placed now will be fulfilled in the order received once stock arrives.

• Shipping Weight: 840 lbs
• Curbside delivery by appointment — freight carrier will contact you to schedule
• Customer must be present to receive and inspect the shipment

Installation Notes

• Indoor residential installation only
• Requires 240V dedicated electrical connection — professional installation recommended
• Install in a dry, climate-controlled environment
• Follow all manufacturer instructions and applicable local building and electrical codes

Warranty

Prime Regeneration is an authorized retailer of Finnmark products. Full manufacturer warranty coverage applies. See the Finnmark Warranty Document (PDF).

Manuals & Documentation

• FD-5 Specification Sheet (PDF)
• Installation & Operation Manual (PDF)
• Wi-Fi Controller Manual (PDF)
• Traditional Heater Manual (PDF)
• ETL Safety Certificate (PDF)
• Manufacturer Warranty (PDF)

FAQ

Do I need special wiring for this sauna?
Yes. The FD-5 Trinity requires a dedicated 240V electrical connection — not a standard household outlet. We recommend having a licensed electrician install the circuit before your sauna arrives.

Does this sauna use steam or water?
The infrared system is completely dry. The included 4.5kW traditional electric heater allows you to pour water over sauna stones for a Finnish-style steam experience. You can use each system independently or together.

How hot does the FD-5 get?
The infrared system reaches up to approximately 170°F. The traditional electric heater can reach up to approximately 190°F. Each system is independently controlled.

Can this sauna go outdoors?
No. The FD-5 Trinity is designed for indoor placement only — home gyms, finished basements, wellness rooms, or dedicated sauna spaces.

How much space do I need?
Check the exterior dimensions in the specifications above. Confirm floor space, ceiling height, and doorway/hallway clearance along the delivery path. At 840 lbs shipping weight, plan your delivery path carefully before ordering.

Is financing available?
Yes. Financing options are available for this purchase. Contact us or proceed to checkout to explore available financing plans.

What warranty comes with this sauna?
Warranty coverage is provided by Finnmark Designs and varies by component. As an authorized retailer, all products we sell carry full manufacturer warranty coverage. See the warranty document linked above.

Still comparing models? Read our Infrared Sauna Buying Guide.