
FINNMARK DESIGN
Finnmark FD-4 Trinity Infrared & Steam Sauna Company USA
The FD-4 Trinity combines low-EMF full-spectrum infrared and a traditional electric steam heater in one cabin — switch between modes depending on what your body needs.
Every Detail
Specifications & Details
Full Specifications
Model: FD-4 Trinity
Capacity: 2 Person
Heat Source: Infrared + Traditional Combo + Red Light Therapy
External Materials: Thermal Plus™ Aspen
Interior Materials: Antimicrobial Western Red Cedar
Exterior Dimensions: 48"W × 48"D × 83"H
Interior Dimensions: 44.25"W × 45.5"D × 75.5"H
Maximum Temperature: 170°F (IR) / 190°F (Traditional)
IR Watts: 1,750W | Traditional Heater: 1.9kW (Harvia Vega Compact)
IR Voltage: 120V / 15A — NEMA 5-15P (standard outlet)
Traditional Heater Voltage: 120V / 20A — dedicated 20A circuit required
Note: Two separate dedicated circuits required — one for IR (15A), one for the traditional heater (20A).
Glass: 8mm Tempered Glass Door
Specifications subject to change. Please confirm before purchase.
What's Included
- All wall, ceiling, and floor panels (pre-assembled kit)
- 8mm Tempered Glass Door with handle
- Infrared Sauna Heater Panels (Spectrum Plus™ UL Listed)
- Spectrum Red Light™ Therapy Panel (192-diode medical grade LED, 650nm)
- Harvia Vega Compact 1.9kW Traditional Sauna Heater (included)
- 1 box Harvia AC3000 sauna stones (29 lbs)
- Controller 2.0 — Built-in LCD Wi-Fi Touchscreen with Bluetooth Audio
- 6" Hi-Fi Speakers
- Extra large two-tier bench system
- Power Supply Unit and power cable
- Interior heater connections with wood cover
- All necessary screws and fasteners
- Assembly instructions
Health Benefits
- Finnmark's Spectrum Plus™ incoloy short-wave infrared heaters warm your core body temperature for a deep, therapeutic sweat — supporting cardiovascular health, muscle recovery, and stress relief.
- Full-spectrum infrared (near, mid, and far wavelengths) penetrates deeper than standard carbon panel heaters, triggering up to 25x more sweat at lower, more comfortable air temperatures.
- Low-EMF design, independently tested at a NASA award-winning facility, ensures a safe and healthy session every time.
- Regular infrared sauna use is associated with reduced inflammation, improved circulation, and enhanced detoxification through sweat.
Shipping & Warranty
Shipping: This Finnmark sauna ships FREE via LTL freight to the contiguous United States. Allow 5–10 business days for dispatch after order confirmation. A tracking number is emailed within 24 hours of shipment.
About This Delivery
The weight and packaging of this handcrafted sauna sanctuary requires delivery by 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, we 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.
Heater Systems & Accessory Freight
Sauna heater system and accessories may ship in a protective box on top of this room’s crate — if so, shipping and packaging is FREE. All shipping and packaging is included at no additional cost.


Trinity Combo
Infrared + Steam + Red Light
UL-listed Spectrum Plus™ infrared, a Harvia Vega traditional heater, and a 192-diode medical-grade red-light panel in one cabin.
Runs on 120V
No Electrician Needed
Every heater and panel plugs into a standard 120V outlet — deep infrared plus real steam over hot rocks for two.

Finnmark FD-4 Trinity Infrared & Steam Sauna Combo
Shipping & Delivery
- Free shipping to the contiguous U.S. (Lower 48 states).
- Ships via LTL freight on a pallet — curbside delivery only. Driver will call ahead to schedule; you are responsible for moving from curbside to your install location.
- Allow 5–10 business days for processing and dispatch. You will receive a tracking number by email once shipped.
- Alaska, Hawaii & Puerto Rico — we ship there! Call or text (856) 426-8530 first for a freight quote; online checkout is limited to the Lower 48. No international shipping.
Key Features
Bundle Your Saunacustomize & add extras
Weatherproof Cover made for this model
Bench Cushion sized for this model
Shipping to Alaska, Hawaii, or Puerto Rico?

Sauna Company USA Policies
Shipping, Warranty & Returns
Shipping & Delivery
Shipping: This Finnmark sauna ships FREE via LTL freight to the contiguous United States. Allow 5–10 business days for delivery after order confirmation. A tracking number is emailed within 24 hours of shipment.
About This Delivery
The weight and packaging of this handcrafted sauna sanctuary requires delivery on a wooden pallet. The driver is responsible for “curbside delivery only” and will lower the items to ground level. Prior to shipping, we 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.
Heater Systems & Accessory Freight
Sauna heater system and accessories may ship in a protective box on top of this room’s crate — if so, shipping and packaging is FREE. All shipping and packaging is included at no additional cost.
Warranty Coverage
10-Year Structural Warranty
Finnmark Design warrants the sauna cabin structure, wood panels, frame, and assembly against defects in materials and workmanship for 10 years from the original purchase date, for residential use.
Unconditional Lifetime Warranty — Spectrum Plus™ Heaters
The Spectrum Plus™ incoloy short-wave infrared heating elements carry an unconditional lifetime warranty — not a “limited” lifetime warranty. These elements are rated for approximately 40,000 operational hours (~130 years at 5 sessions/week). The Carbon 360° mid-wave infrared panels are rated for ~30,000 hours and are covered under the same heater element lifetime warranty.
Not Covered
- Minor surface dents, scratches, scuffing — normal
- Fine hairline cracks in wood — normal wood movement
- Commercial, rental, or shared-access installations
- Damage from improper installation or modification
To File a Claim
Email info@saunacompanyusa.com with your order number and photos of the defect.
Returns & Refunds
30-Day Return Policy
We accept returns on this product within 30 days of delivery. To initiate a return, email info@saunacompanyusa.com with your order number.
Shipping Damage — If the return is required due to damage, include photos of the damage and note whether shipping damage was recorded upon signing for delivery. Shipping costs are fully covered for carrier-caused damage.
No-Damage Returns — No restocking fee is charged. You will be issued a credit for the full amount paid, less any required new boxing fees of approximately $20–$50 depending on the product.
Damaged Product — If the product is damaged, you will be notified to file a claim with your shipper. We assist throughout the process.
View our full Return Policy for complete details.
Installation & Assembly
Curbside Delivery
Freight deliveries are curbside only — the driver will not unpack or carry items indoors. You are responsible for moving the product from curbside and for any assembly. Please arrange help or local movers for delivery day.
Inside Delivery Option
White Glove or inside delivery (and, where available, assembly) can be arranged before shipment for an additional charge. Ensure the freight truck can access your location and that the path to the install site is clear before your delivery date.
Financing Options
Payment Methods
Payment is made at the time of order via the methods we offer — major credit cards, PayPal, and financing partners. Payment processing is handled securely by our third-party processors.
Pricing & Tax
All prices are in U.S. dollars; applicable sales tax is calculated at checkout. Tax-exempt? Provide documentation prior to purchase. Questions: info@saunacompanyusa.com · 856-426-8530.
Resources
Documents & Manuals
Trinity Installation & User Manual
Warranty
10-Year Structural Warranty
Finnmark Design warrants the sauna cabin structure, wood panels, frame, and assembly against defects in materials and workmanship for 10 years from the original purchase date, for residential use.
Unconditional Lifetime Warranty — Spectrum Plus™ Heaters
The Spectrum Plus™ incoloy short-wave infrared heating elements carry an unconditional lifetime warranty — not a “limited” lifetime warranty. These elements are rated for approximately 40,000 operational hours (~130 years at 5 sessions/week). The Carbon 360° mid-wave infrared panels are rated for ~30,000 hours and are covered under the same heater element lifetime warranty.
Not Covered
- Minor surface dents, scratches, scuffing — normal
- Fine hairline cracks in wood — normal wood movement
- Commercial, rental, or shared-access installations
- Damage from improper installation or modification
To File a Claim
Email info@saunacompanyusa.com with your order number and photos of the defect.
The Experience
The Outdoor Sauna, Perfected
Crafted as a fully-assembled architectural retreat, this is outdoor living elevated — premium Nordic timber, expansive glass, and the quiet luxury of heat on demand.
Watch before you build
Installation Guide — Trinity Combo Sauna
The Trinity's infrared panels install exactly like a standard FD-Series kit. This video covers the full panel-based installation process.
to a friend
This Finnmark is absolutely incredible. We had two infrared saunas over the past 20 years and the heat from this Trinity combo is noticeably better and heats up faster. Photo is from our finished install in the basement — it fit the space perfectly and looks fantastic. Right now we're mostly running the infrared on a daily basis and it gets warm in no time. The traditional heater is there for when we want a real Finnish löyly. Highest recommendation.
We wanted the health benefits of infrared plus the warmth of a traditional sauna, so the Trinity combo was perfect. Only the infrared is plugged in right now and it's plenty warm. We may hold off installing the traditional heater since we'd need an electrician to update the circuit, but it's nice to know the option is there.
Love it. Excellent so far — assembly was straightforward and the panels clicked together cleanly. Infrared warms up quick.
We could not be happier with the FD-4 hybrid. We were so worried we'd buy the wrong one, and now we know we chose right. We wanted a sauna that gets really hot and this one does the job on the traditional side. The wood is super high quality, smells amazing, and arrived brand new with no damage. It was delivered on time and wasn't too difficult to put together. One tip: run the wires through the top panel before you set it on — set it on a box, take the top panel off, route the wires to their holes, then connect them as you lower the top. Makes the final assembly much easier.
I'm only using the infrared so far because my traditional heater unit hasn't arrived yet. That said, the sauna was certainly worth the wait. It heats up very quickly — within 30 minutes it's at 160 to 170°F. Shipping took a little longer than I'd have liked, but other than that this is as good as it gets.
The combo sauna is beautiful and the dual heat is genuinely the best of both worlds. Docking a star only because I underestimated the electrical work — the traditional heater needs a dedicated 240V circuit and that cost more than I expected. Get a quote from an electrician before you order. The sauna itself is flawless.
Between the infrared for quick warm-ups and the traditional rocks for a proper steam session, this thing covers everything. Bench space is generous and the glass front makes it feel open. Family loves it.
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