Finnmark FD-5 Trinity XL | 4-Person Infrared, Steam & Red Light Sauna

The FD-5 Trinity XL brings together three distinct sauna experiences in a single 4-person cabin. Finnmark's UL-listed Spectrum Plus™ short-wave incoloy infrared heaters penetrate deep into muscle and tissue, producing a cleaner, more efficient sweat up to 25 times more effective than standard carbon panel heaters. The included Harvia KIP Series B 4.5kW sauna heater uses vulcanite stones to radiate even, intense heat up to 190°F for an authentic Finnish steam experience. A 192-diode medical-grade Spectrum Red Light™ panel delivers 650nm red light therapy directly into the skin, stimulating collagen production and enhancing cellular recovery, rounded out with chromotherapy for complete mind-body restoration.

The antimicrobial Western Canadian Cedar interior is naturally resistant to mold, bacteria, and fungus, while the Thermal Plus™ Thermo-Aspen exterior resists rot, warp, decay, and chipping. An 8mm tempered glass door provides superior thermal retention, and the built-in LCD Wi-Fi touchscreen with Bluetooth audio and 6" Hi-Fi speakers complete the experience.

Three modalities

Infrared: Spectrum Plus™ UL-listed short-wave incoloy heaters penetrate deep into muscle and tissue for a cleaner, more efficient sweat. Up to 25x more effective than carbon panel heaters. Raises core body temperature naturally, improving circulation, lowering blood pressure, and accelerating recovery.

Traditional steam: The Harvia KIP Series B 4.5kW heater uses vulcanite stones to reach up to 190°F. Ladle water onto the stones for an authentic Finnish löyly experience that no infrared heater can replicate.

Red light therapy: A 192-diode Spectrum Red Light™ panel delivers 650nm medical-grade red light therapy to stimulate collagen production, enhance cellular recovery, and support complete mind-body restoration with chromotherapy.

Benefits of infrared

• Raises core body temperature for a deeper, cleaner sweat
• Removes up to 17% more toxins than conventional saunas, including heavy metals, cholesterol, and uric acid
• Supports lower blood pressure and improved heart health
• Accelerates muscle recovery through increased blood flow and oxygen delivery
• Natural pain relief with every session

Key features

• Spectrum Plus™ UL-listed short-wave infrared heaters, deep penetrating heat, up to 25x more effective than carbon panels
• Harvia KIP 4.5kW traditional steam heater, vulcanite stones, water-tossing, up to 190°F
• 192-diode Spectrum Red Light™ therapy panel, 650nm medical-grade red light with chromotherapy
• Built-in LCD Wi-Fi touchscreen controller with Bluetooth audio
• 6" Hi-Fi speakers for immersive audio
• Antimicrobial Western Canadian Cedar interior, naturally resistant to mold, bacteria, and fungus
• Thermal Plus™ Thermo-Aspen exterior, rot, warp, decay, and chip resistant
• Extra-large two-tier bench system
• 8mm tempered glass door for superior thermal retention
• Low EMF, tested by a NASA award-winning testing facility
• High emissivity infrared heaters
• ETL certified
• 4-person capacity

Sauna Cabin

SKU: TRINITY-4X6
Model: FD-5
Brand: Finnmark
Capacity: 4 persons
Exterior Dimensions: 75"W x 64"D x 83"H
Interior Dimensions: 71"W x 57.5"D x 75.5"H
Room Volume: 130 cubic feet
Door Dimensions: 23.625"W x 68.875"H
Glass Thickness: 8mm with gasket
Exterior Material: Thermal Plus™ Thermo-Aspen
Interior Material: Western Canadian Cedar
IR Wattage: 2,700W
Voltage: 240V
Amperage: 15A
Plug Type: NEMA 6-15
Max IR Temperature: 170°F
Max Traditional Temperature: 190°F
Certification: ETL, low EMF
Product Weight: 575 lbs
Shipping Dimensions: 80"W x 40"D x 83"H
Shipping Weight: 840 lbs

Harvia KIP Series B Sauna Heater

Model: KIP45B
Kilowatt Rating: 4.5kW
Voltage: 240V / 1PH
Amperage: 18.8A
Room Size: 100 to 210 cubic feet
Width: 16" (406 mm)
Depth: 11" (279 mm)
Height: 24" (609 mm)
Heater Weight: 40 lbs
Warranty: 2-year (consumer use)

• 6 sauna panels, bottom, top, back, front, left, right
• Glass door, bench support, bench top, floor grid
• Spectrum Plus™ infrared heater panels
• Harvia KIP Series B 4.5kW sauna heater
• 1 box of Harvia AC3000 sauna stones (44 lbs)
• 192-diode Spectrum Red Light™ therapy panel with chromotherapy
• Spectrum LED near-infrared ceiling lights
• Controller 2.0, LCD Wi-Fi touchscreen with Bluetooth audio
• Heater cable, floor cable, power supply unit, power cable
• Interior heater connections with wood cover
• Door handle, screws
• ETL certification
• Limited warranty

Note: each natural stone is unique in shape and size. An additional box of sauna stones is recommended to allow selection of the best fit; additional freight charges may apply if purchased separately.

The FD-5 Trinity XL arrives in 6 panels and assembles with basic tools. A dedicated 240V circuit is required for the infrared system (NEMA 6-15, 15A) and a separate 240V single-phase circuit is required for the Harvia KIP heater (18.8A). Installation by a licensed electrician is required for the heater. Load sauna stones loosely into the Harvia heater basket before first use; a minimum of 50 lbs is required. The LCD Wi-Fi touchscreen controls both the infrared and steam systems. Connect via Wi-Fi and pair Bluetooth audio through the Controller 2.0. Refer to the included installation manual for full assembly, wiring, and setup guidance.

Finnmark Trinity Operation Manual

Controller Manual

Trinity FD-5 Dimensions

Harvia KIP Manual

EMF Test Log

For general wellness purposes only. No medical claims are made or implied. Results are not guaranteed and may vary. Always consult a qualified healthcare professional before use, especially if you have a medical condition, are pregnant, nursing, taking medication, or use an implanted electronic device.

2-year consumer warranty on the Harvia KIP Series B sauna heater. Covers manufacturing defects in materials and workmanship under normal residential use. Does not cover damage from improper installation, misuse, neglect, or failure to follow electrical requirements. 1-10 years on sauna parts - please see details in the attached document. 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.

Finnmark Warranty

Free shipping to the contiguous United States, though remote or complex delivery areas may not qualify. The sauna ships on a wooden pallet by special appointment, and we contact customers prior to shipping to confirm logistics and discuss any delivery circumstances. Delivery is curbside only; the driver will lower items to ground level but will not bring them inside. Returns are accepted within 30 days of delivery and require prior approval before anything is sent back. Please reach out to support@marterraelements.com to get the process started. Items must be unused, undamaged, and in their original condition with original packaging intact. Change of mind returns are subject to a restocking fee of up to 20%, and return shipping costs are the responsibility of the customer. Proof of purchase is required for all returns.