Finnmark FD-4 Trinity Infrared & Steam Sauna Combo

Transform your space into a high-end wellness sanctuary with the industry’s most complete sauna system.

2-Person Home Sauna with Infrared & Traditional Heater 48"W x 48"D x 83"H

Experience the ultimate in heat therapy with the Trinity 3-IN-ONE—an unparalleled fusion of full-spectrum infrared, authentic Finnish steam, and true medical-grade red light therapy. Reach a powerful 170°F and enjoy every major sauna modality in one beautifully crafted cabin designed to elevate your wellness routine to new heights.

The Trinity 3-IN-ONE is the only sauna that seamlessly integrates Finnmark’s UL-listed Spectrum Plus™ infrared heaters, a traditional 120V Finnish sauna heater, and advanced Spectrum Red Light™ Therapy. This unique combination delivers the deepest muscle penetration, the fastest heat-up times, and a complete spectrum of therapeutic benefits—all without compromise. When you can have it all, why settle for less?

With Finnmark’s FD-4 Trinity, you experience the only true combination sauna featuring UL-certified infrared technology paired with a genuine Finnish heater for traditional steam. The powerful short-wave infrared heaters pass rigorous UL testing and produce up to 25 times more sweat than standard carbon panels, helping relieve tension, loosen muscles, and enhance detoxification.

For those who crave the classic sauna ritual, the included 1.9kW heater allows you to pour water over the rocks for rich, invigorating steam. It’s the authentic Finnish experience, right at home.

To complete the wellness trifecta, integrated Spectrum Red Light™ Therapy uses targeted wavelengths to support collagen production, cellular rejuvenation, and overall skin health—an ideal enhancement to your heat therapy routine.

Give yourself the gift of total rejuvenation with Finnmark Design’s Trinity 3-IN-ONE Sauna—where infrared, steam, and red light combine to create the most comprehensive home sauna experience available today.

Traditional sauna heater included.

• Spectrum Plus™ UL-Listed Short-Wave Infrared Heaters
  Delivers powerful, deeply penetrating heat—up to 25× more effective than standard carbon panel heaters—for unmatched therapeutic intensity.

• Medical-Grade Spectrum Red Light™ Therapy
  A 192-diode LED panel produces highly beneficial 650nm wavelengths, paired with soothing chromotherapy for enhanced recovery, skin health, and overall wellness.

• Antimicrobial Cedar Interior
  Crafted from Western Canadian cedar, naturally resistant to mold, bacteria, and fungus for a clean, hygienic sauna environment.

• Durable Thermal Plus™ Aspen Exterior
  Built to never rot, warp, decay, or chip. This premium exterior ensures longevity, stability, and one of the healthiest sauna builds on the market.

• True 3-IN-ONE Combination System
  The only sauna that integrates UL-listed infrared heaters, a traditional high-heat steam heater, and medical-grade red light therapy—all in one. Enjoy the deep muscle penetration of infrared, the powerful steam of traditional sauna rocks, and the rejuvenating benefits of LED red light therapy without compromise.

• Smart Wi-Fi LCD Touchscreen Control
  Built-in digital controller with Wi-Fi connectivity and Bluetooth audio for personalized comfort and entertainment.

• Premium Audio System
  Upgraded 6" Hi-Fi speakers deliver rich, immersive sound throughout your session.

• 8mm Tempered Glass
  Ensures superior thermal retention while adding a modern, sleek finish.

• Extra-Large Two-Tier Bench System
  Offers comfort, flexibility, and ample seating space for an elevated relaxation experience.

• Low EMF Design
  Independently tested by a NASA award-winning facility to ensure extremely low EMF levels for safe, confident daily use.

• High-Emissivity Infrared Heaters
  Engineered to maximize output, efficiency, and therapeutic benefits.

Harvia Vega Compact 1900 Traditional Sauna Heater

• Wall-mounted stainless steel design

• 1.9kW heater ideal for rooms 70–106 cu. ft.

• Requires 29 lbs of sauna stones (1 box AC3000)

• Built-in controls with ergonomic switches (installable on right or left side)

• Designed, engineered, and manufactured in Finland

• Dimensions: 11" W × 11" D × 21" H

• 2-Year consumer warranty

• Note: Stones are natural and vary in shape/size. An additional box is recommended for best selection. Additional freight charges may apply.

What’s Included

• Bottom panel

• Top panel

• Back panel

• Front panel

• Left panel

• Right panel

• 8mm tempered glass door

• Bench support & bench top

• Heater cable

• Floor cable

• Screws & hardware

• Power supply unit

• Power cable

• Interior heater connections with wood cover

• Door handle (with screws)

• Infrared sauna heater panels

• Harvia Vega Compact 1900 heater

• One box of Harvia AC3000 sauna stones (29 lbs)

• Spectrum LED near-infrared ceiling lights with medical-grade Spectrum Red Light Therapy

• Controller 2.0 — built-in Wi-Fi LCD touchscreen with Bluetooth audio

• ETL certification

• Limited warranty

Model: FD-4

Exterior Material: Thermo-Aspen
Interior Material: Western Red Cedar

Electrical Requirements:

• Voltage: 120V

• Infrared Output: 1750W

• Amperage: 15/20A

• Plug Type: NEMA 5-15P

• Outlet: Standard 120V / 15A

Maximum Temperatures:

• Infrared: 170°F

• Traditional: 190°F

Dimensions

• Interior: 44.25" W × 45.5" D × 75.5" H

• Exterior: 48" W × 48" D × 83" H

• Room Volume: 86 cu. ft.

• Glass Door: 23.625" W × 68.875" H

• Door Handle: 1.5" W × 13.25" H

• Glass Thickness: 8mm with gasket

Weight

• Product Weight: 437 lbs

• Shipping Dimensions: 80" W × 40" D × 58" H

• Shipping Weight: 618 lbs

Traditional Heater (Harvia Vega Compact 1900)

• Model: Vega Compact 1900

• Kilowatt Rating: 1.9 kW

• Fuel Type: Electric

• Room Size Compatibility: 70–106 cu. ft.

• Voltage: 120V

• Phase: 1PH

• Nominal Amps: 15.9A

• Heater Weight: 15.4 lbs

• Shipping Weight with Stones: 59.4 lbs

Heater Dimensions:

• Width: 11" (279 mm)

• Depth: 11" (279 mm)

• Height: 21" (533 mm)

About Finnmark Designs

Finnmark Designs is a leader in premium infrared sauna innovation, known for combining advanced heating technology with exceptional craftsmanship. With a commitment to wellness, performance, and safety, Finnmark has set a new standard in the infrasauna industry—engineering products that deliver deeper therapeutic benefits, higher temperatures, and unmatched durability.

What truly distinguishes Finnmark is its pioneering approach to infrared heating. They are the only manufacturer to integrate UL-listed Spectrum Plus™ short-wave heaters with 360° long-wave carbon infrared panels, creating a full-spectrum experience that outperforms traditional infrared saunas in heat penetration, efficiency, and overall results. Each sauna is thoughtfully designed to deliver maximum therapeutic coverage and consistent, high-quality heat distribution.

Finnmark’s dedication to purity and longevity is reflected in their material choices. Their interiors feature antimicrobial Western Canadian cedar, while their exteriors are crafted from Thermal Plus™ Aspen, an eco-friendly wood treated for extreme durability. This ensures every sauna not only performs at a superior level but also maintains a clean, hygienic environment for years of use.

With thousands of units sold worldwide and a reputation built on innovation, safety, and reliability, Finnmark Designs continues to be a trusted manufacturer for those seeking a truly elevated infrared sauna experience.

Finnmark Designs Infrared Sauna Warranty

Finnmark Certification

ETL Certification

Owner's Manual

Operation Manual