Description
The Finnmark FD-4 Trinity is a premium 2-person 3-in-1 home sauna that combines full-spectrum infrared heat, traditional Finnish steam, and medical-grade red light therapy in one compact indoor system.
This advanced sauna features UL-Listed Spectrum Plus™ infrared heaters, a Harvia Vega Compact 1.9kW traditional sauna heater, and Spectrum Red Light™ therapy — allowing you to experience infrared heat up to 170°F or authentic steam heat up to 190°F.
Designed for serious home wellness in a compact 4x4 footprint, the Trinity FD-4 delivers versatility, performance, and luxury craftsmanship.
3-In-1 Heating Technology
The FD-4 is the only combination sauna in its class integrating certified infrared panels with a true traditional heater.
• UL Listed Spectrum Plus™ short-wave infrared heaters
• Spectrum Carbon long-wave infrared panels
• Harvia Vega Compact 1.9kW traditional heater
• Medical-grade Spectrum Red Light™ therapy panel (192 diode, 650nm)
• Infrared up to 170°F
• Traditional steam up to 190°F
• Splash water onto rocks for authentic steam
Choose infrared, steam, red light therapy, or combine all three for a fully customizable sauna experience.
Traditional Harvia Sauna Heater Included
The Trinity FD-4 includes the Harvia Vega Compact 1900 sauna heater, engineered and manufactured in Finland.
• Wall-mounted stainless steel construction
• 1.9kW electric heater
• Built-in ergonomic controls
• 120V / 1PH operation
• Designed for sauna rooms 70–106 cu. ft.
• Requires minimum 29 lbs of stones
• 2-Year Consumer Warranty
Add water to the stones for a true Finnish steam experience.
Red Light Therapy Integration
Enhance recovery with medical-grade red light therapy.
• 192 diode LED panel
• 650nm red light wavelength
• Combined with chromotherapy
• Supports skin wellness and circulation
Red light therapy complements both infrared and steam sessions for a complete wellness ritual.
Health & Recovery Benefits
Full-spectrum infrared and traditional steam support optimal recovery.
• Deep tissue heat penetration
• Enhanced blood flow
• Promotes detoxification
• Supports muscle recovery
• Encourages relaxation
• Traditional steam intensity for deeper sweating
Short-wave infrared penetrates significantly deeper than carbon-only heaters, delivering a more powerful sweat session.
Premium Materials & Construction
Built for durability and hygiene.
• Antimicrobial Western Red Cedar interior
• Thermal Plus™ Thermo-Aspen exterior
• Double-walled insulated construction
• 8mm tempered glass door with gasket
• Two-tier bench seating
• Low EMF tested
The cedar interior resists mold and odor while the thermo-treated exterior resists warping and decay.
Illumination & Smart Controls
Modern control technology enhances convenience.
• Built-in LCD Wi-Fi touchscreen controller
• Bluetooth audio system
• 6” Hi-Fi speakers
• Spectrum LED near infrared ceiling lights
• ETL Certified components
Control temperature, lighting, and audio from the integrated control panel.
Features
• 3-In-1 Infrared + Steam + Red Light Therapy
• Harvia Vega Compact 1.9kW heater included
• UL Listed Spectrum Plus™ infrared heaters
• Medical-grade 650nm red light therapy
• Infrared 170°F | Traditional 190°F
• 120V plug-in configuration
• Antimicrobial cedar interior
• Thermo-Aspen exterior
• Wi-Fi touchscreen controller
• Bluetooth audio system
• 2-Person capacity
• Compact 4x4 indoor footprint
What’s Included
Sauna Components
• Top, bottom, back, front, left & right panels
• 8mm tempered glass door with gasket
• Two-tier bench system
• Infrared heater panels
• Spectrum Red Light™ therapy panel
• Heater cables & power components
• Interior heater connections
• Screws & hardware
• Door handle & hinges
Traditional Heater Package
• Harvia Vega Compact 1900 heater
• 1 Box Harvia AC3000 Sauna Stones (29 lbs)
Control & Audio
• Built-in LCD Wi-Fi touchscreen controller (Controller 2.0)
• Bluetooth audio system
• 6” Hi-Fi speakers
Certification & Warranty
• ETL Certification
• Limited Manufacturer Warranty
• Harvia 2-Year Heater Warranty
Specifications
| Model | FD-4 |
| Capacity |
2 Persons |
| Exterior Dimensions |
48” W x 48” D x 83” H |
| Room Volume |
86 cu. ft. |
| Maximum Temperature |
170°F | Traditional 190°F |
| Interior Dimensions |
44.25” W x 45.5” D x 75.5” H |
| Voltage |
120V |
| Watts |
1750W |
| Plug Type | NEMA 5-15P |
| Outlet Standard | 120V 15A |
| Glass Thickness |
8mm Tempered with Gasket |
| Product Weight |
437 lbs |
| Shipping Weight |
618 lbs |
| Interior Material |
Western Canadian Cedar |
| Exterior Material |
Thermo-Aspen |
Harvia Heater Specifications
| Model |
Vega Compact 1900 |
| Voltage | 120V |
| Killowatt Rating |
1.9kW |
| Phase | 1PH |
| Amperage | 15.9Amps |
| Room Capacity |
70–106 cu. ft. |
| Dimensions |
11” W x 11” D x 21” H |
| Heater Weight | 15.4 lbs |
Technical
Installation Manual |
|
Operation Manual V2 LCD Controller with WiFI |
|
Model FD-4 Diagram |
|
EMF Test Log |
|
FD-4 Spec Sheet |
|
Finnmark Warranty |
|
Harvia Installation and Operational Manual |
|
Harvia Suitable Stone Update |
Why Choose the Finnmark FD-4 Trinity?
The FD-4 Trinity is ideal for homeowners who want:
• A compact 3-in-1 infrared and steam sauna
• Authentic Finnish steam capability
• UL-listed full-spectrum infrared performance
• Integrated red light therapy
• Space-saving 4x4 footprint
• Premium cedar craftsmanship
• Smart Wi-Fi control and Bluetooth audio
It combines infrared, steam, and red light therapy into one powerful compact wellness system built for serious home recovery.