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Finnmark FD-4 Trinity from the front-right corner, cedar interior lit red behind the glass door
Rated 5.0/5 based on 1 review
Finnmark Designs

Finnmark FD-4 Trinity Hybrid Infrared & Steam Sauna & Red Light · 2-Person

2-person combination sauna with six Spectrum Plus™ infrared heaters, a Harvia Vega 1.9 kW heater with stones and a red light panel in a red cedar cabin.

$7,795
$8,999.99
Save $1,204.99
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Estimated delivery

14–22 days after you order

Stock checked Oct 16, 2026

  • Infrared to 170°F, Harvia traditional heat with stones, and a red light panel in one cabin.
  • Infrared plugs into a dedicated 120 V, 15 A outlet; the Harvia heater is wired by an electrician.
  • 10-year cabin warranty and a lifetime warranty on the Spectrum Plus™ heaters.
Included with your sauna purchase
The Sauna Mastery Protocol Digital Guide
The Sauna Mastery Protocol Digital Guide
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  1. The carrier books a time with you

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  2. Curbside, lowered to the ground

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    Note any damage on the delivery receipt and take photos before the driver leaves. Report damage to us within 24 hours.

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    Products are sourced through authorized channels and include the applicable manufacturer warranty, subject to the manufacturer's terms. Terms vary by brand and model, and we'll send you the exact warranty document on request.

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    How freight delivery works Shipping policy

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What Customers Say About This Product

“As someone who has tried multiple saunas over the years, the Finnmark FD-4 Trinity Infrared & Steam Sauna Combo is by far the best I’ve…”

AmandaC.
Verified buyer
Description

The Finnmark FD-4 Trinity is a 2-person indoor sauna that combines three ways to bathe in one cedar cabin: infrared heat from six Spectrum Plus™ heaters, traditional sauna heat from a Harvia Vega Compact 1.9 kW heater with stones, which gives steam when water is thrown on them, and a Spectrum Red Light™ LED panel in the ceiling. It measures 48.8" W × 48.8" D × 83.1" H outside and 44.5" W × 45.1" D × 75.2" H inside, with two benches at different heights.

The infrared side runs on 120 V from a dedicated 15 A outlet and reaches 170°F; the Harvia heater, wired separately by a licensed electrician, adds traditional heat on its stones. Finnmark makes the Trinity in two sizes: this 2-person FD-4 and the larger FD-5 Trinity XL.

 

Features

Three ways to use the Finnmark FD-4 Trinity

  • Infrared: six Spectrum Plus™ heaters with Incoloy-sheathed elements, three on the back wall, one under the upper bench and one on each side wall, rated at 1,750 W on 120 V. Finnmark's manual allows about 15–20 minutes to warm to a comfortable temperature and 55–60 minutes to reach the 170°F maximum, and notes that the maximum may not be reached in every setting. Finnmark warrants these heaters for life.
  • Traditional: a Harvia Vega Compact 1.9 kW heater on the front interior wall, filled with sauna stones and controlled by the timer and thermostat on the heater itself. Throwing water on the hot stones adds steam.
  • Red light: a Spectrum Red Light™ LED panel in the ceiling, which Finnmark specifies at 650 nm, with other colors selected on the control panel.

Does the Finnmark FD-4 Trinity have red light therapy?

Yes. The FD-4 has a Spectrum Red Light™ LED panel built into the ceiling, which Finnmark specifies at 650 nm, and Finnmark's manual says red light therapy is used by selecting the "red" button on the control panel. The panel also switches to white, orange, blue, yellow, purple, green, cyan or magenta, or scrolls through the colors.

Controls, sound and ventilation

  • Controller 2.0: an LCD touchscreen control panel that sets the infrared temperature and session time and runs the lights, fan and audio. The Harvia heater is set on the heater itself.
  • Wi-Fi app: the FD-4 connects to the Smart Life app, which switches the sauna on, sets the target temperature and session time, and schedules sessions in advance.
  • Bluetooth audio: a pair of 6" speakers plays from a paired device.
  • Ventilation: a ceiling fan switched from the control panel, and a ceiling vent that can be opened at any time for fresh air.

Materials and construction

  • Interior: clear A-grade Canadian Western Red Cedar.
  • Exterior: Thermo-Aspen, which Finnmark sells as Thermal Plus™ and treats with heat and steam rather than chemicals. Finnmark says the treatment makes the wood less prone to warping, cracking and cupping.
  • Walls: tongue-and-groove panels with insulated walls.
  • Benches: two benches at different heights, the upper one 44.5" wide and 18.9" deep, the lower one 44.5" wide and 15.7" deep.
  • Door: tempered glass, 0.31" thick.

Cedar is a natural material, and Finnmark's manual notes that variations in color and grain, knots and fine cracks are part of the wood's character, not defects.

 

What's Included

What comes with the Finnmark FD-4 Trinity?

The Finnmark FD-4 ships as a complete kit: the six wall, floor and ceiling panels with the infrared heaters and the red light panel built in, two benches, the tempered glass door in its front panel, the touchscreen control panel, speakers and power supply, the Harvia heater in its own box with a box of sauna stones, and the hardware and manual to assemble it. What it needs on site is a dedicated 120 V, 15 A outlet for the infrared side and a separate circuit for the Harvia heater, which a licensed electrician wires.

Included in the kit

  • Front panel with the tempered glass door
  • Back, left and right wall panels with the infrared heaters built in
  • Roof panel with the Spectrum Red Light™ LED panel, and the floor panel
  • Two benches, the bench support with the under-bench heater, and the backrest
  • Five adjustable feet for leveling
  • Controller 2.0 touchscreen control panel with Wi-Fi and Bluetooth, and a pair of 6" speakers
  • Power supply unit and a power cord of about 9 feet with a NEMA 5-15 plug
  • Harvia Vega Compact 1.9 kW heater, with its mounting plate and reflector
  • One box of Harvia AC3000 sauna stones
  • Door handle and the assembly screws
  • Installation and operation manual

Not included — arranged or ordered separately

  • The Harvia heater's circuit and connection, made by a licensed electrician.
  • A dedicated 15 A, 120 V circuit with a NEMA 5-15 outlet for the infrared side, if there is not one where the sauna will stand.
  • The Finnmark FD4 outdoor cover, which Finnmark requires if the sauna is placed outdoors.
  • A Finnmark FD-4 seat cushion in marine-grade vinyl.
  • The Finnmark ergonomic cedar backrest, a movable curved backrest.
  • Tools: a screwdriver and a level, which Finnmark lists, and a drill for mounting the Harvia heater's back plate.

The cover, the cushion and the ergonomic backrest can be added to the order on this page.

Specifications
Finnmark FD-4 Trinity specifications
Model FD-4 Trinity
Brand Finnmark Designs
Sauna type Combination sauna: infrared, traditional (Harvia heater) and red light; indoor
Capacity 2 people
Exterior dimensions 48.8" W × 48.8" D × 83.1" H
Interior dimensions 44.5" W × 45.1" D × 75.2" H
Interior volume About 87 cu ft (calculated from the interior dimensions)
Benches Upper 44.5" W × 18.9" D; lower 44.5" W × 15.7" D
Door opening 23.63" W × 68.88" H
Door swing 23.9" in front of the sauna
Glass Tempered, 0.31" thick
Interior wood Clear A-grade Canadian Western Red Cedar
Exterior wood Thermo-Aspen (Finnmark Thermal Plus™)
Infrared heaters 6 Spectrum Plus™ Incoloy heaters (3 back wall, 1 under the upper bench, 1 per side wall)
Infrared electrical 120 V, 15 A, single phase, 1,750 W; NEMA 5-15P plug on a cord of about 9 ft; dedicated 15 A circuit with a NEMA 5-15 outlet
Traditional heater Harvia Vega Compact 1.9 kW (HCBU1912241) on the front interior wall; timer and thermostat on the heater
Harvia heater electrical 15.9 A at 120 V (8 A if wired for 240 V); hard-wired by a licensed electrician
Sauna stones One box of Harvia AC3000 stones; the heater takes up to 28.5 lb of 2–4" stones (Harvia)
Red light Spectrum Red Light™ LED panel in the ceiling, 650 nm per Finnmark, with color settings
Controls Controller 2.0 touchscreen with Wi-Fi app control; the Harvia heater has its own controls
Audio Bluetooth, pair of 6" speakers
Maximum temperature 170°F on infrared (Finnmark)
Infrared heat-up time 55–60 minutes to 170°F (Finnmark manual)
Certification ETL listed by Intertek to UL 875; cETL listed to CSA C22.2 No. 164
Placement Indoors; outdoors only under the Finnmark cover and an awning or overhang
Product weight 437 lb
Warranty Finnmark's warranty sheet: 10 years on the cabin (indoor residential), lifetime on the Spectrum Plus™ heaters; the Harvia heater has Harvia's own warranty
Installation & Electrical

What electrical work does the Finnmark FD-4 Trinity need?

The Finnmark FD-4 needs two circuits. The infrared heaters, lights, controls and audio plug into a dedicated 15 A, 120 V circuit with a standard NEMA 5-15 outlet, and Finnmark's manual asks that no other devices share it. The power supply sits at the top front of the cabin and the cord is about 9 feet long, so the outlet has to be within that reach; the manual rules out extension cords.

The Harvia Vega Compact heater is wired separately. Harvia's manual requires it to be permanently connected by a licensed electrician, with no plugs or receptacles inside the sauna room. It draws 15.9 A at 120 V, or 8 A if wired for 240 V. Finnmark's manual asks you to give the Harvia installation manual to the electrician; it is linked under Documents. Your licensed electrician sizes the breaker and wire from the manual that ships with the heater and your local code.

For the infrared outlet, Finnmark's manual says all wiring should be performed by a licensed electrician following local codes, the National Electrical Code (NFPA 70) in the US and the Canadian Electrical Code in Canada, and calls for a grounded three-wire outlet.

Where can the Finnmark FD-4 Trinity be installed?

The FD-4 is a freestanding indoor sauna. Finnmark's manual says it must not be built into any structure and needs a solid surface in a dry area, with at least 3" of clearance above it and on every side so the power cord stays accessible. The manual suggests a basement, attic, garage, playroom, spare bedroom or new extension. Allow 23.9" in front of the sauna for the door to swing open, and a ceiling at least 86.1" high: the 83.1" cabin plus the 3" clearance.

Using the FD-4 outdoors

The FD-4 is designed for indoor use, and Finnmark allows it outdoors only on its conditions. It must be covered with the Finnmark FD4 outdoor cover; placing it outside without a cover voids the warranty. It must also stand under an awning or overhang so rain does not fall directly on the roof, on sturdy, dry, level ground rather than grass, gravel or dirt, and never on a surface that gets wet from rain or snow. Finnmark notes that the cover protects against limited weather exposure but not extreme conditions, that its snap buttons should stay clipped and its zippers closed when the sauna is not in use, and that warm-up times vary with the outdoor temperature. Outdoors, Finnmark's warranty on the cabin is 5 years instead of 10.

How is the Finnmark FD-4 Trinity assembled?

The FD-4 arrives as prefabricated panels that screw together. The floor panel goes down first on its feet, leveled in the sauna's final position, followed by the back and side panels, the bench and its heater, the front panel and the roof panel, which takes two people to lift. The power-supply cables are then connected, the Harvia heater's back plate is mounted on the wall and the heater hung on it, the door handle fitted and the power cord plugged in; the electrician then connects the Harvia heater. Finnmark lists a screwdriver and a level as tools, but mounting the Harvia back plate also takes a drill. Finnmark's manual requires at least two able people and states that professional installation is required.

Before the first session, Finnmark recommends wiping the interior with a damp cloth and running the empty sauna at maximum temperature for an hour, a few times, to burn off factory dust.

Shipping

How is the Finnmark FD-4 Trinity delivered?

The Finnmark FD-4 ships free to the contiguous US by LTL freight, as a crate on a wooden pallet. Delivery is by appointment and curbside: the driver lowers the shipment to ground level and is not responsible for moving it further, so plan how two people will carry the panels from the curb to the room where the sauna will stand. The carrier will reach out to book the delivery appointment.

Finnmark FD-4 Trinity freight
Freight type LTL truck, crated on a wooden pallet
Delivery Curbside, by appointment, lowered to ground level
Crate size 80" L × 36" W × 52" H
Shipping weight 485 lb

Inspect the crate before you sign. Photograph any damage to the packaging, note it on the delivery receipt, and contact us before assembling the sauna.

Documents

Finnmark's installation and operation manual for the FD-4, Harvia's manual for the heater and Finnmark's warranty sheet are available before you order, so you and your electrician can check the dimensions, both circuits and the assembly steps in advance.

Finnmark FD-4 Trinity installation and operation manual, REV.08-2026 (PDF)

Harvia Vega Compact installation and operation manual (PDF)

Harvia sauna stone requirements (PDF)

Finnmark Designs warranty sheet, updated December 12, 2022 (PDF)

Why Finnmark?

Why Finnmark?

Finnmark Designs builds infrared saunas with Spectrum Plus™ heaters, in a cedar interior with a Thermo-Aspen exterior. The FD-1, FD-2 and FD-3 are full-spectrum models; the Trinity FD-4 and FD-5 add a Harvia traditional heater and a red light panel.

  • Up to 170°F on infrared. Finnmark's manuals give 170°F as the maximum infrared setting for every model, reached in about 55–60 minutes.
  • Spectrum Plus™ heaters. Incoloy-sheathed Spectrum Plus™ elements heat every model. The FD-1, FD-2 and FD-3 add Spectrum Carbon panels and Spectrum LED ceiling lights with a red setting.
  • Low EMF/ELF heaters. Finnmark labels its Spectrum Plus™ heaters Low EMF/ELF.
  • Cedar inside, Thermo-Aspen outside. Clear A-grade Canadian Western Red Cedar lines the interior. The exterior is Thermo-Aspen, which Finnmark treats with heat and steam rather than chemicals and sells as Thermal Plus™.
  • Warranty. Finnmark's warranty sheet covers the cabin and its controls and power supply for 10 years in indoor residential use (5 years outdoors), the Spectrum Plus™ heaters for life, and the carbon heaters and LED lighting for 10 years.
  • ETL listed. The FD-1, FD-2, FD-3 and FD-4 are ETL listed by Intertek to UL 875.

The Finnmark range

Finnmark infrared saunas: seating, exterior size and power
Model Seats Exterior (W × D × H) Power
FD-1 1 37" × 37.8" × 78.3" 120 V on a dedicated 15 A outlet
FD-2 2 48" × 43.5" × 78.3" 120 V on a dedicated 15 A outlet
FD-3 3–4 70.9" × 45.3" × 78.3" 240 V on a dedicated 15 A circuit, NEMA 6-15
FD-4 Trinity 2 48.8" × 48.8" × 83.1" Infrared on 120 V / 15 A, plus a Harvia heater on its own circuit, wired by an electrician
FD-5 Trinity XL 3–4 74.8" × 63.8" × 83.1" Infrared on 240 V / 15 A, plus a hard-wired Harvia heater, wired by an electrician
EMF Report


Warranty

Your Own Sauna Ritual, in 3 Simple Steps

A straightforward kit, with professional electrical work where required.

Assemble the Sauna Structure
Step 1

Assemble the Sauna Structure

The sauna structure fits a standard ceiling height and is designed for on-site assembly, following the manufacturer's step-by-step manual.

Pick your heat
Step 2

Pick your heat

Traditional steam, infrared, or both — switch between modes session to session, we help you set it up right.

Build Your Sauna Routine
Step 3

Build Your Sauna Routine

The included Sauna Mastery Protocol locks in session times, temperatures, and weekly rhythm, so the sauna becomes a habit, not an expensive coat rack.

The Topture Experience

More than just a sauna

Your purchase includes thoughtful extras to help you get started and enjoy your sauna with confidence.

The Sauna Mastery Protocol
BONUS 1

The Sauna Mastery Protocol

The session times, temperatures, and weekly rhythm that turn a sauna into a habit you keep. Covers heat-up protocols and what to expect across your first 30 sessions. Sent to your inbox after purchase.

INCLUDED
Full-Value Freight Protection
BONUS 2

Full-Value Freight Protection

Large orders ship fully insured. If freight arrives damaged, Topture helps coordinate the claim and replacement process with the carrier and manufacturer. Proper inspection and damage documentation at delivery are required. Most in-stock orders ship within 2–7 business days.

INCLUDED
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What Topture Customers Say

Topture is rated 4.9/5 across 463 customer reviews

We thought about buying a sauna for years and finally did. We absolutely love it, especially in the winter. It’s incredibly easy to assemble with two people the whole family uses it.

Verified buyer

Ordered this sauna fall 2024 and we love it. No better feeling during a Minnesota winter. Lastly, I have to mention the customer service for this purchase has been like no other. Any questions or requests I had were addressed immediately by Topture. I got more than I expected from them and have already recommended them to several people looking for saunas. SO if you're thinking about it, JUST DO IT already..

Verified buyer

Thanks for the great service - greatly appreciated.

Verified buyer

WHY BUY FROM TOPTURE?

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Buying a sauna involves more than choosing a model and clicking checkout. Heater sizing, electrical requirements, freight delivery, installation, and warranty support all matter.

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463 Customer Reviews

Product and store reviews from Topture customers, collected by Judge.me.

Lifetime Expert Support

Same team before and after the sale, from sizing to warranty support.

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Sold by Topture, with the applicable manufacturer warranty.

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Freight damage? We help coordinate the claim and replacement process.

Customer reviews

What customers say about the Finnmark FD-4

  • 5 stars: 1 (100%)
  • 4 stars: 0 (0%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
A
AmandaC.
Ultimate Wellness Experience

As someone who has tried multiple saunas over the years, the Finnmark FD-4 Trinity Infrared & Steam Sauna Combo is by far the best I’ve encountered. It heats up quickly, and the infrared heat feels soothing, while the steam option delivers that classic, deeply relaxing sweat.
Installation was straightforward, and it fits perfectly in my home. My partner and I use it several times a week, and it has truly elevated our wellness routine. Whether you’re looking for relaxation, detoxification, or just a moment of calm in your day, this sauna offers it all. Highly recommend it!

Thank you, Samantha, for your glowing review! We're thrilled to hear that the Finnmark FD-4 Trinity Infrared & Steam Sauna Combo is the right fit for you and creates the wellness experience you were looking for. We're also happy to hear that the installation process was straightforward. Thank you for your recommendation and for choosing our sauna as part of your wellness journey. Enjoy your sauna sessions, and please don't hesitate to reach out if you ever need anything else!

STILL UNSURE?

Frequently Asked Questions

How many people fit in the Finnmark FD-4 Trinity?
The Finnmark FD-4 Trinity is a 2-person sauna with two benches at different heights: an upper bench 44.5 inches wide and 18.9 inches deep, and a lower bench 44.5 by 15.7 inches. The room measures 44.5 inches wide, 45.1 inches deep and 75.2 inches high, about 87 cubic feet. The larger FD-5 Trinity XL is rated by Finnmark for three to four people.
What are the dimensions of the Finnmark FD-4 Trinity?
The Finnmark FD-4 Trinity measures 48.8 inches wide, 48.8 inches deep and 83.1 inches high on the outside, including its 6.1-inch base, and 44.5 by 45.1 by 75.2 inches inside. The glass door opening is 23.63 inches wide by 68.88 inches high, and the door needs 23.9 inches of clear space in front of the sauna to swing open. Finnmark's manual asks for at least 3 inches of clearance above the sauna and on every side, so the room needs a ceiling at least 86.1 inches high. The sauna weighs 437 pounds.
Does the Finnmark FD-4 Trinity need an electrician?
Yes, for the Harvia heater, which is always hard-wired by a licensed electrician on its own circuit. On the FD-4, the infrared side plugs into a dedicated 15-amp, 120-volt circuit with a standard NEMA 5-15 outlet. The Harvia Vega Compact heater draws 15.9 amps at 120 volts, or 8 amps if wired for 240 volts; Harvia's manual requires a permanent connection with no plugs in the sauna room. Finnmark's manual asks you to give the Harvia installation manual to the electrician. Your licensed electrician sizes the breaker and wire from the manual that ships with the heater and your local code.
How hot does the Finnmark FD-4 Trinity get?
On infrared, the Finnmark FD-4 Trinity reaches 170°F: Finnmark's manual allows about 15 to 20 minutes to warm to a comfortable temperature and 55 to 60 minutes to reach 170°F, and notes that the maximum may not be reached in every setting. With the Harvia heater, throwing water on the stones adds steam. The infrared side is set on the touchscreen control panel or in the Smart Life app; the Harvia heater is set on the heater itself.
What heaters does the Finnmark FD-4 Trinity use?
The Finnmark FD-4 Trinity has six Spectrum Plus infrared heaters with Incoloy-sheathed elements, three on the back wall, one under the upper bench and one on each side wall, rated at 1,750 watts on 120 volts, plus a Harvia Vega Compact 1.9 kW traditional heater with stones on the front interior wall. A Spectrum Red Light LED panel sits in the ceiling. Finnmark warrants the Spectrum Plus heaters for life; the Harvia heater has Harvia's own warranty.
Does the Finnmark FD-4 Trinity have red light therapy?
Yes. The Finnmark FD-4 Trinity has a Spectrum Red Light LED panel built into the ceiling, which Finnmark specifies at 650 nm, and Finnmark's manual says red light therapy is used by selecting the red button on the control panel. The panel also switches to white, orange, blue, yellow, purple, green, cyan or magenta, or scrolls through the colors.
Can the Finnmark FD-4 Trinity be used outdoors?
Only on the conditions Finnmark sets. The FD-4 is designed for indoor use, and outdoors it must be covered with the Finnmark FD4 outdoor cover; Finnmark's manual says placing it outside without a cover voids the warranty. It must also stand under an awning or overhang so rain does not fall directly on the roof, on sturdy, dry, level ground rather than grass, gravel or dirt. The cover protects against limited weather exposure but not extreme conditions, and warm-up times vary with the outdoor temperature. Outdoors, Finnmark's warranty on the cabin and its controls is 5 years rather than 10.
What warranty does the Finnmark FD-4 Trinity have?
Finnmark's warranty sheet, last updated December 12, 2022, covers the FD-4's cabin and its controls and power supply for 10 years in indoor residential use, or 5 years outdoors. The Spectrum Plus heaters are covered for life and the LED lighting for 10 years. The warranty runs to the original purchaser and applies when the sauna is installed according to Finnmark's instructions, properly maintained, not damaged, misused or abused, and used residentially. Components that were not installed at the factory are not covered. The Harvia heater is covered by Harvia's own warranty, not by Finnmark's sheet, and Harvia's manuals make it conditional on correct installation by a licensed electrician.
Is the Finnmark FD-4 Trinity ETL listed?
Yes. Intertek lists the Finnmark FD-4 as a dry sauna room under UL 875, the US safety standard for electric dry-bath heaters, and it carries the ETL Listed mark. It is also cETL listed to CSA C22.2 No. 164, the Canadian standard for electric sauna heating equipment.
What comes with the Finnmark FD-4 Trinity, and what is sold separately?
The Finnmark FD-4 Trinity arrives as a complete kit: six wall, floor and ceiling panels with the infrared heaters and the red light panel built in, two benches, the tempered glass door in its front panel, the Controller 2.0 touchscreen with Wi-Fi and Bluetooth, a pair of 6-inch speakers, the power supply and a power cord of about 9 feet, five adjustable feet, the Harvia Vega Compact 1.9 kW heater with a box of Harvia stones, the hardware and the manual. Three Finnmark accessories can be added on this page: the FD4 outdoor cover, which is required if the sauna goes outside, a marine-grade vinyl seat cushion made for the FD-4, and a movable ergonomic cedar backrest. The electrician's work, on the Harvia heater's circuit and on the infrared outlet if you do not have one, is arranged separately.
How do you assemble the Finnmark FD-4 Trinity?
The Finnmark FD-4 Trinity comes as prefabricated panels that screw together: the floor panel on its adjustable feet, leveled in the sauna's final position, then the back and side panels, the bench and its heater, the front panel and the roof panel, which takes two people to lift. After the power-supply cables are connected, the Harvia heater's back plate is mounted on the wall with a drill, which Finnmark's tool list of a screwdriver and a level leaves out, and the heater is hung on it; a licensed electrician then connects it. Finnmark's manual requires at least two able people and states that professional installation is required.
How is the Finnmark FD-4 Trinity delivered?
The Finnmark FD-4 Trinity ships free to the contiguous US by LTL freight, crated on a wooden pallet about 80 by 36 by 52 inches and weighing about 485 pounds. Delivery is by appointment and curbside: the driver lowers the shipment to ground level and does not carry it further, so plan how two people will move the panels to the room where the sauna will stand. The carrier will reach out to book the appointment. Inspect the crate and photograph any damage before signing, note it on the delivery receipt, and contact us before assembling the sauna.
How does the Finnmark FD-4 Trinity compare with the FD-5 Trinity XL?
Both combine Spectrum Plus infrared heaters, a Harvia traditional heater with stones and a red light panel, but the FD-4 is the compact one: 48.8 by 48.8 inches for two people, with six infrared heaters on 120 volts (1,750 watts) and a Harvia Vega Compact 1.9 kW heater. The FD-5 Trinity XL is 74.8 by 63.8 inches, rated by Finnmark for three to four people, with nine infrared heaters on 240 volts (3,150 watts) and a Harvia KIP 4.5 kW heater that is hard-wired on its own 240-volt circuit. Both stand 83.1 inches tall and reach 170°F on infrared.
How do you care for the Finnmark FD-4 Trinity?
Before first use, wipe the inside of the Finnmark FD-4 Trinity with a damp cloth and run the empty sauna at its maximum temperature for an hour, a few times, to burn off factory dust. The exterior can be cleaned with a natural furniture polish or beeswax, and outdoors Finnmark recommends a coat of heavy furniture polish or beeswax even under the cover. Light scratches or stains on the interior cedar can be removed with fine-grade sandpaper, and knots, grain variation and fine cracks are natural in cedar. Harvia's manual asks for the stones to be rearranged at least once a year, more often with frequent use, and crumbled stones replaced with new ones.

General Topture Questions

Where are you located, and where do you ship from?

Topture is an online retailer serving customers in the contiguous United States. The company is Topture LLC, a Wyoming limited liability company, and its registered business address is 30 N Gould St, Ste N, Sheridan, WY 82801.

Orders ship from manufacturer and distributor warehouses in the U.S. and Canada, and some products ship directly from the manufacturer in Europe. Each product page shows its estimated delivery time.

How much is shipping?

Orders over $200 ship free within the contiguous United States. Orders under $200 carry a small shipping fee.

Two exceptions: SaunaLife and ThermaSol products carry a freight charge at any order value, and sauna stones ordered without a heater ship at $60 per box because of their weight.

Every charge is shown at checkout before you pay.

Do you provide financing?

Absolutely! To view your financing offer, simply select Shop Pay Installments as your payment method at Step 3 of checkout.

You'll need to enter a debit card to receive your offer, but don’t worry—you can still back out before completing the purchase.

How long will it take for my items to arrive?

If your order is in stock, most orders ship within 2–7 business days of purchase. Transit time then depends on the distance from the warehouse and, for freight, on booking a delivery appointment.

For custom, pre-order or made-to-order items, the estimated delivery time frame is listed on the product page. Delivery dates are estimates, so please don't book installation labor until your order has arrived and been inspected.

What happens after I place my order?

As soon as you place your order, you'll receive a confirmation email with your order details—be sure to keep it for your records. Once your order ships, you'll receive another email with tracking information.

For freight deliveries, the carrier will call or text you to schedule an appointment once the shipment reaches their local terminal. Someone needs to be there to inspect the shipment and sign for it. Smaller parcels arrive by UPS or FedEx without an appointment.

Is there a warranty?

Yes. Products purchased through Topture include the applicable manufacturer’s warranty, subject to the manufacturer’s terms. You’ll find the warranty details for each product under the "Warranty" tab on its product page, and we help with troubleshooting and warranty coordination if an issue comes up.

Do you have a showroom?

We don’t have a showroom — we sell online. Our team is available by phone, email and chat to help you compare models, sizes and heaters, and we can send dimensions, installation manuals and electrical requirements before you buy.

Where do you deliver to?

We deliver throughout the 48 contiguous states, with curbside freight delivery for large items. Free shipping and standard rates apply there only. Alaska, Hawaii, Puerto Rico, other U.S. islands and Canada are quoted separately, depending on the brand and model. We can't ship freight or oversized items to P.O. boxes.

Do you ship internationally?

International Shipping

For many products, yes, including to Canada, by custom quote. Email contact@topture.com with the product and your address before you order; availability and cost depend on the brand and model. Any duties, taxes and customs fees are your responsibility.

Shipping to Hawaii, Alaska, and Puerto Rico

Free shipping applies to the contiguous United States only. Shipping to Alaska, Hawaii, Puerto Rico and other U.S. islands is quoted separately and depends on the brand and model. Email contact@topture.com for a quote before you order.

Finnmark FD-4 Trinity from the front-right corner, cedar interior lit red behind the glass door

Your indoor sauna, done the right way.

  • Infrared to 170°F, Harvia traditional heat with stones, and a red light panel in one cabin.
  • Infrared plugs into a dedicated 120 V, 15 A outlet; the Harvia heater is wired by an electrician.
  • 10-year cabin warranty and a lifetime warranty on the Spectrum Plus™ heaters.
Included with your sauna purchase
The Sauna Mastery Protocol Digital Guide
The Sauna Mastery Protocol Digital Guide
Full-Value Freight Protection
Full-Value Freight Protection

  • Covered by the manufacturer's warranty

    Products are sourced through authorized channels and include the applicable manufacturer warranty, subject to the manufacturer's terms. Terms vary by brand and model, and we'll send you the exact warranty document on request.

    If something goes wrong, contact us first: we help troubleshoot and coordinate the claim with the manufacturer.

    Contact our team

  • Full-Value Freight Protection

    Large orders ship fully insured. If freight arrives damaged, Topture helps coordinate the claim and replacement process with the carrier and manufacturer.

    At delivery, note any damage on the delivery receipt and take photos before the driver leaves, then report it to us within 24 hours.

    How freight delivery works Shipping policy

  • We're here after your purchase, too.

    Need help with delivery, installation documentation, heater questions or a warranty issue? Our team can help you find answers and coordinate with the manufacturer when needed.

    Contact our team