FD-4 Full-Spectrum 2-Person Trinity Infrared & Steam Sauna Combo Kit

The FD‑4 Trinity brings together three sought‑after heat technologies in one beautifully crafted sanctuary. Finnmark’s UL‑listed Spectrum Plus™ infrared heaters, a traditional 120V sauna heater, and Spectrum Red Light™ create a versatile environment designed for a deeply warming, fully immersive sauna experience.

The UL‑listed infrared heaters deliver fast, enveloping warmth, while the traditional 1.9kW heater allows you to enjoy classic rock‑and‑steam sessions for an authentic sauna atmosphere. The combination offers a wide range of heat sensations — from gentle infrared warmth to invigorating high‑heat steam.

Spectrum Red Light™ adds an additional layer of ambiance, creating a calming glow that complements your wellness routine and enhances the overall environment inside the sauna.

The interior is crafted from antimicrobial Western Canadian cedar, chosen for its naturally fresh aroma and resistance to mold and bacteria. The exterior features Finnmark’s Thermal Plus™ Aspen, engineered to resist warping, rotting, and outdoor wear for long‑lasting durability.

A built‑in LCD Wi‑Fi touchscreen controller, Bluetooth audio, and an extra‑spacious two‑tier bench system elevate the experience with thoughtful comfort and modern convenience.

Features

• Spectrum Plus™ UL‑listed short‑wave infrared heaters for fast, enveloping warmth
• Spectrum Red Light™ panel with 192 LEDs for a vibrant, soothing glow
• Antimicrobial Western Canadian cedar interior
• Thermal Plus™ Aspen exterior engineered for long‑term durability
• 3‑in‑1 design combining infrared, traditional heat, and red‑light ambiance
• Built‑in LCD Wi‑Fi touchscreen controller
• Bluetooth audio with 6" Hi‑Fi speakers
• 8mm tempered glass for excellent thermal retention
• Spacious two‑tier bench layout
• Low‑EMF infrared heaters tested by a third‑party facility

Harvia Vega Compact 1900 Heater

• Wall-mounted design
• Stainless Steel construction
• 1.9kW output
• For sauna rooms from 70 to 106 cu. ft. 
• Requires a minimum of 29 lbs of sauna stones (1 Box-AC3000)
  • Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply). 
• Built-in controls
• Ergonomic operating switches
• Switches can be installed on the right or left side of the heater
• Designed, engineered, and made in Finland
• Dimensions: 11"W (279mm) x 11"D (279mm) x 21" (533mm)
• 2-Year Warranty (Consumer use)
  • Manufacturer's Note: Sauna heater stones are significant to the unit's safety. In order for the warranty to remain valid, the user is responsible for proper maintenance.

What's Included

Shipping! 

This product ships FREE within the contiguous United States. 

• Bottom Panel
• Top Panel
• Back Panel
• Front Panel
• Left Panel 
• Right Panel 
• Glass Door
• Bench Support
• Bench Top
• Heater Cable
• Floor Cable
• Screws
• Power Supply Unit
• Power Cable
• Interior Heater Connections with Wood Cover
• Door Handle (2 Screws)
• Infrared Sauna Heater Panels
• Harvia Vega Compact 1900 Sauna Heater
• 1 Box of the Harvia AC3000 0-10cm Sauna Stones (29 lbs)
  • Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply).
• Spectrum LED Near Infrared Ceiling Lights Combined with Spectrum Red Light™ technology
• Controller 2.0, Built-In LCD Wi-Fi Touchscreen Control Panel with Bluetooth Audio
• ETL Certification
• Limited Warranty

*Placing your sauna outside without the Finnmark FD-4 Waterproof Sauna Cover will void your warranty. If you choose to place your sauna outdoors, you must use a cover to protect your sauna (sold separately). Don’t place the sauna on a surface that easily gets wet.  Constructed with the highest quality marine grade materials, this cover is a dependable choice.

The Finnmark FD-4 Waterproof Sauna Cover comes with a vertical roll-up door and has three ties to secure the door at the top. The weather slot allows you to run the power cord out the top of the rear panel in the middle.

Specifications and Documentation

Model FD-4 Infrared Sauna

Model Harvia Vega Compact 1900 Sauna Heater

Finnmark Installation and Operation Manual

Finnmark V2 WIFI Controller Manual

Harvia Vega 1900 Sauna Heater IOM

Harvia Suitable Sauna Stones Update

Finnmark Certification

Finnmark Intertek ETL Infrared Sauna Safety Certificate

Finnmark EMF Test Log

Sauna Cover Limited Warranty

Shipping

Freight Cost: This product ships FREE within the contiguous United States. 

*On rare occasions, remote or complex delivery areas may not qualify for these rates.

About This Delivery: This exceptional Infrared Sanctuary requires delivery by a special appointment, and on a wooden pallet. The driver is responsible for “curbside delivery only” and will lower the items to ground level. Prior to shipping this product, we often contact customers to share shipment details and discuss any extenuating delivery circumstances that may complicate or cause additional delivery expenses. Our goal is to ensure your project’s success.

• Dimensions: 80"W x 40"D x 58"H
• Weight: 618 lbs