Finnmark FD-4 Trinity 2-Person Combination Sauna | Infrared + Traditional Steam

Full-Spectrum Infrared + Traditional Finnish Sauna + Red Light Therapy | Indoor 3-in-1 Cabin

The Finnmark FD-4 Trinity Combination Sauna is a premium 2-person indoor sauna designed for customers who want a complete home wellness experience without choosing between infrared, traditional sauna heat, or red light therapy. This advanced 3-in-1 sauna combines Finnmark Spectrum Plus™ infrared heaters, a Harvia Vega Compact 1900 traditional electric sauna heater, and Spectrum Red Light™ Therapy in one beautifully crafted cabin.

Built with a Western Canadian cedar interior, a durable Thermal Plus™ Aspen exterior, 8mm tempered glass, built-in Wi-Fi touchscreen controls, Bluetooth audio, and low-EMF tested infrared heating, the FD-4 Trinity is designed for serious home sauna users who want flexibility, performance, and a luxury indoor sauna experience.

Enjoy lower-temperature infrared sauna sessions up to approximately 170°F, or use the traditional electric heater for a hotter Finnish-style sauna experience up to approximately 190°F. The included Harvia Vega Compact 1900 heater allows water to be poured over sauna stones for an authentic steam sauna feel.

Who This Is For

• Indoor residential sauna installation
• Couples or 2-person households
• Customers who want infrared, traditional sauna heat, and red light therapy in one cabin
• Home gyms, wellness rooms, primary suites, and relaxation spaces
• Buyers who want a compact luxury sauna with flexible heating options
• Customers who prefer a standard 120V sauna setup

Why Choose the FD-4 Trinity

• 3-in-1 combination sauna — infrared, traditional steam, and red light therapy in one cabin
• Plugs into a standard 120V 15A outlet — no electrician required in most setups
• Harvia Vega Compact 1900 traditional heater included — pour water over stones for authentic steam
• Spectrum Red Light™ Therapy panel included
• Built-in LCD Wi-Fi touchscreen controller and Bluetooth audio
• Low EMF tested by an independent testing facility
• ETL safety certified

Heating Systems

Full-Spectrum Infrared Heat

• Spectrum Plus™ infrared heaters — full-spectrum infrared coverage
• Short-wave infrared heaters are UL listed
• High-emissivity infrared heating system
• Comfortable sauna sweat at lower ambient temperatures than traditional sauna sessions
• Maximum temperature: approximately 170°F

Traditional Sauna Heater — Harvia Vega Compact 1900

• 1.9kW traditional electric sauna heater, 120V
• Designed for sauna rooms from 70 to 106 cu. ft.
• Pour water over sauna stones for a Finnish-style steam experience
• Requires a minimum of 29 lbs of sauna stones (included)
• Maximum temperature: approximately 190°F

Spectrum Red Light™ Therapy

• 192-diode LED panel
• 650nm red light combined with chromotherapy
• Designed as a relaxing enhancement to your sauna wellness routine

Key Features

• 3-in-1 combination sauna experience
• Designed for 2-person indoor residential use
• Western Canadian cedar interior
• Thermal Plus™ Aspen exterior
• 8mm tempered glass for thermal retention
• Extra-large two-tier bench system
• Built-in LCD Wi-Fi touchscreen controller
• Bluetooth audio with 6" Hi-Fi speakers
• Low EMF tested by an independent testing facility
• ETL safety certified
• Standard 120V 15A outlet — NEMA 5-15P plug

Specifications

• Brand: Finnmark Designs
• Model: FD-4 Trinity
• SKU: FD-KN004 / TRINITY-4X4
• Sauna Type: 3-in-1 combination infrared, traditional, and red light sauna
• Capacity: 2 persons
• Exterior Dimensions: 48" W x 48" D x 83" H
• Interior Dimensions: 44.25" W x 45.5" D x 75.5" H
• Room Volume: 86 cu. ft.
• Door Dimensions: 23.625" W x 68.875" H
• Glass Thickness: 8mm with gasket
• Product Weight: 437 lbs
• Shipping Dimensions: 80" W x 40" D x 58" H
• Shipping Weight: 618 lbs
• Voltage: 120V
• IR Watts: 1750W
• Amperage: 15/20A
• Plug Type: NEMA 5-15P
• Outlet: Standard 120V 15A
• Installation: Indoor residential use only

Harvia Vega Compact 1900 Heater Specifications

• Heater Model: Harvia Vega Compact 1900
• Kilowatt Rating: 1.9kW
• Voltage: 120V / 1PH
• Nominal Amps: 15.9A
• Adjusted Cubic Feet: 70–106 cu. ft.
• Heater Dimensions: 11" W x 11" D x 21" H
• Heater Weight: 15.4 lbs
• Construction: Stainless steel
• Controls: Built-in controls with ergonomic switches
• Country of Manufacture: Finland
• Heater Warranty: 2-year consumer-use warranty

What's Included

• FD-4 Trinity sauna cabin panels (bottom, top, back, front, left, right)
• Tempered glass door with handle
• Bench support and bench top
• Spectrum Plus™ infrared heating panels
• Harvia Vega Compact 1900 sauna heater
• 1 box of Harvia AC3000 sauna stones (29 lbs)
• Spectrum Red Light™ Therapy panel (192-diode LED)
• Controller 2.0 built-in LCD Wi-Fi touchscreen with Bluetooth audio
• Power supply unit and power cable
• Heater cable and floor cable
• Interior heater connections with wood cover
• Screws and installation hardware
• Manufacturer documentation and ETL certification documentation

Shipping & Delivery

Free freight shipping is included for delivery within the contiguous United States. In-stock orders typically ship within 4–7 business days. This product is currently on backorder with an estimated ship date of August 21, 2026 — orders placed now will be fulfilled in the order received once stock arrives.

• Shipping Dimensions: 80" W x 40" D x 58" H
• Shipping Weight: 618 lbs
• Ships on a wooden pallet
• Curbside delivery by appointment — freight carrier will contact you to schedule

Installation Notes

• Indoor residential installation only — not for outdoor use
• Install in a dry, climate-controlled indoor environment
• Requires standard 120V 15A outlet (NEMA 5-15P)
• No plumbing required
• Review manufacturer installation instructions before assembly
• Confirm local building and electrical requirements before installation
• Allow appropriate clearance around the sauna per manufacturer instructions

Warranty

Prime Regeneration is an authorized retailer of Finnmark products. Full manufacturer warranty coverage applies. See the Finnmark Warranty Document (PDF).

Manuals & Documentation

• Installation & Operation Manual (PDF)
• Wi-Fi Controller Manual (PDF)
• ETL Safety Certificate (PDF)
• Manufacturer Warranty (PDF)

FAQ

Do I need special wiring for this sauna?
No. The FD-4 Trinity runs on a standard 120V 15A outlet — no electrician required in most residential setups. Both the infrared system and the included Harvia Vega Compact 1900 traditional heater operate on 120V. Confirm your outlet is a standard NEMA 5-15P before installation.

Does this sauna use steam or water?
The infrared system is completely dry. The included Harvia Vega Compact 1900 traditional heater allows you to pour water over sauna stones for a Finnish-style steam experience. You can use each system independently or together.

How hot does this sauna get?
The infrared system reaches up to approximately 170°F. The traditional electric heater can reach up to approximately 190°F. Each system is independently controlled.

Can this sauna go outdoors?
No. The FD-4 Trinity is designed for indoor placement only — home gyms, finished basements, wellness rooms, or dedicated sauna spaces. It should not be exposed to weather or installed in unfinished or unconditioned spaces.

How much space do I need?
The FD-4 has a 48" W x 48" D exterior footprint and stands 83" tall. Confirm floor space, ceiling height, and doorway/hallway clearance along the delivery path before ordering.

Is financing available?
Yes. Financing options are available for this purchase. Contact us or proceed to checkout to explore available financing plans.

What warranty comes with this sauna?
Warranty coverage is provided by Finnmark Designs and varies by component. As an authorized retailer, all products we sell carry full manufacturer warranty coverage. See the warranty document linked above.