FD-4 Trinity Infra-Steam Sauna
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The only 2-person hybrid sauna engineered for full-spectrum infrared, authentic steam, and red light therapy — all on a 120V plug. The FD-4 combines medical-grade near-infrared, a Harvia Finnish steam stove, and antimicrobial cedar in a compact, easy-to-install design.
Features
- Heats to 170°F (infrared) or 190°F (steam) – dual heat flexibility
- Dual infrared system: Carbon 360° far-IR + UL-listed Spectrum Plus™ near-IR
- Harvia Vega Compact 1.9 kW traditional heater with steam stones (included)
- Built-in 650nm red light therapy – supports skin, circulation, recovery
- Digital touchscreen control with WiFi remote app access
- Bluetooth audio with premium 6" built-in speakers
- Constructed from antimicrobial Western Red Cedar (interior) and rot-proof Thermal Plus™ Aspen (exterior)
- ETL safety certified with ultra-low EMF heaters
- Assembles in under 60 minutes – no special tools or installers required
Specifications
| Category | Detail |
|---|---|
| Capacity | 2 person |
| Exterior Dimensions | 48″ W x 48″ D x 83″ H |
| Interior Dimensions | 45.2″ W x 44.5″ D x 75.5″ H |
| Volume | 86 cu. ft. |
| Weight | 437 lbs (Shipping: 485 lbs) |
| Wood Type | Interior: Western Red Cedar; Exterior: Thermal Plus™ Aspen |
| Glass | 8mm tempered glass door |
| Heating System | Full-spectrum: Carbon far-IR + Spectrum Plus™ near-IR + Harvia steam stove |
| Infrared Output | 1.7 kW |
| Steam Output | 1.9 kW (Harvia Vega Compact) |
| Max Temperature | 170°F (IR), 190°F (Steam) |
| Red Light Therapy | Integrated ceiling-mounted 650nm LED array |
| Control Panel | Touchscreen digital panel w/ WiFi app control |
| Lighting | Chromotherapy LEDs |
| Audio | Bluetooth receiver, dual 6” built-in speakers |
| Electrical Setup | 120V / 15A standard household circuit; NEMA 5-15 plug; no hardwiring required; outlet must be dedicated |
Construction & Materials
The FD-4 features a double-walled cabin lined with Grade-A Western Red Cedar — naturally antimicrobial and aromatic — and a Thermal Plus™ Aspen exterior that will never rot, warp, or decay. The walls are insulated for maximum heat retention and energy efficiency. Its 8mm tempered glass door provides durability and a clean aesthetic.
Installation
The FD-4 is designed for indoor use only and fits under standard 8-ft ceilings. It assembles in 30–60 minutes with two people. No tools or professional installation required — the panels lock together via pre-fitted hardware, and the wiring is plug-and-play. It sits on any flat indoor surface including tile, wood, or carpet. Adjustable leveling feet are included.
Operation & Usage
Once plugged into a standard 120V / 15A outlet, use the touchscreen or app to power on the infrared system (up to 170°F), set your session time (up to 60 minutes), and control lighting and audio. Activate the Harvia stove separately via built-in controls to reach up to 190°F. Add water to the included sauna stones for true Finnish-style steam. Use infrared, steam, or both. No plumbing required.
EMF & Safety
- The FD-4 is built with safety at its core:
- Ultra-low EMF output, third-party tested
- ETL certified to UL/CSA electrical safety standards
- Built-in overheat protection and session timer
Zero off-gassing materials or adhesives
Ideal for daily use in residential settings.
Why Choose Sauna Luxuries?
Premium Saunas Backed by Real Experts
At Sauna Luxuries, we’re more than just another online store — we’re your dedicated partner in wellness. Every product we offer is carefully selected for quality, performance, and long-term value. As an authorized dealer, we guarantee authentic models, factory warranties, and expert guidance every step of the way. From fast answers to custom recommendations, we make shopping for your perfect sauna effortless.
Everything You Need to Know Before You Buy
Frequently Asked Questions
We currently only ship within the continental United States. If you're located in Alaska, Hawaii, or Canada, reach out to us and we’ll explore your options.
Shipping times vary by brand, but most saunas are delivered within 7 to 15 business days. We’ll send tracking updates and stay in touch every step of the way.
Most of our saunas arrive as pre-built kits with easy, clasp-together panels. No special tools are needed, and setup typically takes 1–3 hours with two people.