The Finnmark FD-4 Trinity 3-IN-ONE Sauna is a premium combination home sauna that integrates full-spectrum infrared heating, a traditional Finnish-style electric sauna heater, and integrated red light technology into a single compact sauna cabin.
Designed for residential wellness spaces, the Trinity 3-IN-ONE allows users to enjoy infrared heat, traditional steam-style sauna heat, or a combination of both. Operating on a 120V electrical connection, the FD-4 provides flexibility for homes where higher-voltage installations are not required.
Pre-Order Notice
Due to high demand, this item is currently on backorder.
Next available shipment is expected late August 2026.
Heating System
The FD-4 Trinity combines multiple heating technologies into one system:
- Spectrum Plus™ UL-listed short-wave infrared heaters
- Spectrum Carbon 360° long-wave infrared panels
- Spectrum red light LED ceiling panel
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Harvia Vega Compact 1900 (1.9 kW) electric sauna heater with sauna stones
This configuration allows users to switch between infrared sessions, traditional sauna sessions with steam, or blended use depending on preference.
Materials & Construction
The interior is constructed from Western Canadian cedar, selected for its suitability in sauna environments. The exterior features Thermal Plus™ Aspen, a heat-treated wood designed for dimensional stability and long-term durability.
Double-wall construction with insulation and 8 mm tempered glass supports thermal efficiency during regular use.
Features
- 3-in-1 combination sauna: infrared, traditional electric sauna, and red light
- UL-listed Spectrum Plus™ infrared heaters
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Spectrum Carbon 360° infrared panels for full-body coverage
- Integrated Spectrum red light LED panel
- Harvia Vega Compact 1900 (1.9 kW) electric sauna heater
- Built-in LCD Wi-Fi touchscreen controller with Bluetooth audio
- Integrated audio system with 6 in Hi-Fi speakers
- Extra-large two-tier bench system
- Low-EMF design
- High-emissivity infrared heaters
What’s Included
- Bottom, top, back, front, left, and right panels
- Glass door
- Bench supports and bench tops
- Infrared heater panels
- Harvia Vega Compact 1900 sauna heater
- 1 box of Harvia AC3000 sauna stones (29 lbs)
- Heater and floor cables
- Power supply unit and power cable
- Interior heater connections with wood cover
- Door handle and hardware
- Spectrum near-infrared & red light ceiling panel
- Controller 2.0 LCD Wi-Fi touchscreen control panel
- Bluetooth audio system
- ETL certification
- Limited warranty
Additional sauna stones may be purchased separately.
Technical Specs – Sauna
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Model: FD-4
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Interior Materials: Western Canadian Cedar
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Exterior Materials: Thermal Plus™ Aspen
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Voltage: 120 V
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IR Output: 2700 W
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Plug Type: NEMA 6-15
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Maximum Temperature:
- Infrared: up to 170°F
- Traditional sauna: up to 190°F
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Interior Dimensions: 71 in W × 57.5 in D × 75.5 in H
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Exterior Dimensions: 80 in W × 40 in D × 58 in H
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Room Volume: 70–106 cu ft
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Glass Thickness: 8 mm
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Product Weight: 618 lbs
Technical Specs – Sauna Heater
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Model: Harvia Vega Compact 1900
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Output: 1.9 kW
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Fuel Type: Electric
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Voltage: 120 V
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Sauna Room Size: 70–106 cu ft
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Heater Dimensions: 11 in W × 11 in D × 21 in H
- UL Listed
- 2-Year Consumer Warranty
Shipping
Free shipping included
Delivered by special appointment on a wooden pallet
Curbside delivery only (items lowered to ground level)
Customers may be contacted prior to shipment to confirm delivery details and address site-specific considerations.
Why the Finnmark FD-4 Trinity
- Multiple sauna heating options in one compact system
- Operates on 120V, ideal for standard residential installations
- Premium materials and construction
- Traditional Finnish sauna capability with infrared flexibility
- Designed for long-term home wellness use
