Finnmark FD-4 Trinity Infrared and Steam Sauna Combo, 2 Person

Product Description

The Finnmark FD-4 Trinity brings three kinds of heat to one cabin built for two. Step in for full-spectrum infrared, add traditional heat from a Harvia sauna heater and stones, and switch on the red light panel, all from a single bench.

The cabin is finished in clear A-grade Canadian Western Red Cedar inside and a Thermal Plus Aspen exterior, with a tempered glass door and two-tier benching. It stands freestanding indoors and can be placed outdoors when paired with the fitted cover. Add the combination bench cushion, the outdoor cover, or both to match where and how you plan to use it.

Per Finnmark Designs, the FD-4 Trinity pairs Spectrum Plus infrared panels with a Harvia Vega Compact 1.9 kW sauna heater and a box of Harvia AC3000 stones, so you can run infrared heat, traditional steam heat, or both. A V2 LCD touchscreen controller with Bluetooth manages temperature, timing, and the interior lighting. The infrared side runs on a dedicated 120V, 15-amp circuit through a NEMA 5-15P plug, and the Harvia sauna heater is hardwired on its own dedicated 120V circuit. Have a licensed electrician confirm both circuits before installation.

We confirm your exact shipping timeline within 1-2 business days of your order - or email us before you buy for the current lead time on this product. Your order ships with free standard shipping to the lower 48. The FD-4 Trinity carries a 10-year limited warranty on the cabin, electrical, and audio components and an unlimited lifetime warranty on the Spectrum Plus infrared panels, with a 2-year residential warranty on the Harvia Vega Compact heater, from Finnmark Designs. Questions before you order? Email support@thetherapeuticpatio.com or call (225) 535-3580.

Ideal for: households that want infrared and traditional sauna heat in one cabin for two, indoors or, with the cover, outside.

Finnmark Designs: craftsmanship in cedar and aspen.

Features

• Three heat modes: full-spectrum infrared, traditional heat, and a red light panel in one cabin.
• Full-spectrum infrared: Spectrum Plus dual-wave infrared panels.
• Traditional sauna heater: a Harvia Vega Compact 1.9 kW heater with a box of Harvia AC3000 sauna stones.
• Red light panel: a 650 nm red light panel built into the cabin.
• Seats two: two-tier cedar benching sized for two.
• Western Red Cedar interior: clear A-grade Canadian cedar lines the cabin.
• Thermal Plus Aspen exterior: tongue-and-groove, insulated exterior paneling.
• Tempered glass door: a full-height glass front.
• V2 LCD touchscreen controller: a 5-inch touchscreen with Bluetooth manages temperature, timer, and lighting.
• Multi-color LED lighting: adjustable interior color lighting.
• Two-circuit power: infrared on a 120V, 15-amp NEMA 5-15P plug; the Harvia heater hardwired on its own 120V circuit.
• Freestanding cabin: a self-contained unit that does not build into a wall.
• ETL listed: the FD-4 carries ETL certification.
• Optional combination bench cushion: a cushion sized for the FD-4 Trinity (Cushion set to Yes).
• Optional outdoor cover: a waterproof cover sized to the FD-4 for outdoor placement (Cover set to Yes).
• Warranty from Finnmark Designs: 10-year limited coverage on the cabin, electrical, and audio, with lifetime Spectrum Plus heater coverage and a 2-year Harvia heater warranty.

Specifications

Construction and Installation

• Interior: clear A-grade Canadian Western Red Cedar
• Exterior: Thermal Plus Canadian Aspen, tongue-and-groove, insulated walls
• Door: tempered glass
• Placement: freestanding, indoor use; outdoor use requires the fitted cover
• Assembly: minimum two able adults, per the manual
• Certification: ETL listed

Electrical and Fuel

• Infrared: 120V, 15 amps, single phase, NEMA 5-15P plug on a dedicated circuit
• Sauna heater: Harvia Vega Compact, 1.9 kW, 120V, hardwired on a dedicated 20-amp circuit by a licensed electrician
• Heaters: Spectrum Plus infrared panels plus a Harvia Vega Compact traditional sauna heater with a box of Harvia AC3000 0-10 cm sauna stones
• Lighting: 650 nm red light panel and multi-color LED lighting
• Have a licensed electrician confirm both dedicated circuits before installation

Controls

• V2 LCD 5-inch touchscreen controller
• Temperature and timer control
• Bluetooth audio
• Adjustable multi-color LED interior lighting

Dimensions and Capacity

• Exterior: 48 inches wide x 48 inches deep x 83 inches high
• Interior: 44 inches wide x 45 inches deep x 75 inches high
• Capacity: seats 2
• Room volume: 86 cubic feet
• Weight: 437 lb; shipping weight 485 lb

What's Included vs. Sold Separately

• Included in the carton: cabin panels (bottom, top, back, front, left, right), glass door, bench support and bench top, heater cable, floor cable, screws, door handle with two screws, power supply unit and power cable, interior heater connections with wood cover, Spectrum Plus infrared heater panels, Harvia Vega Compact 1900 sauna heater with mounting plate and reflector, one box of Harvia AC3000 0-10 cm sauna stones (29 lb), 650 nm red light panel, multi-color LED lighting, V2 LCD 5-inch touchscreen controller with Bluetooth, ETL certification, limited warranty.
• Sold separately, offered as options on this page: FD-4 combination sauna cushion (Cushion set to Yes); FD-4 outdoor sauna cover (Cover set to Yes).

Product Manuals

• Finnmark FD-4 Owner's Manual (08-2026) (PDF)
• Finnmark FD-4 Trinity Owner's Manual Supplier Copy (PDF)
• Finnmark V2 Wi-Fi Controller Manual (PDF)
• Finnmark FD-4 Technical Spec Sheet (PDF)
• Finnmark Spectrum Plus Infrared Heater Spec (PDF)
• Finnmark FD-4 Harvia Vega Compact Data Sheet (PDF)
• Finnmark FD-4 Dimensions Diagram (PDF)
• Finnmark Warranty (PDF)