Finnmark Infrared Sauna Comparison: FD-1 vs FD-2 vs FD-3 vs FD-4 vs FD-5

Use this guide to compare the Finnmark Designs infrared sauna lineup available from Body Recovery HQ. The right model depends primarily on capacity, available floor space, electrical service, and whether you want infrared only or a hybrid infrared/traditional experience.

Feature	FD-1	FD-2	FD-3	FD-4 Trinity	FD-5 Trinity XL
Best fit	Compact solo setup	Versatile 2-person home sauna	3–4 people / extra room	Compact hybrid setup	Large hybrid setup
Capacity	1	2	3–4	2	4
Exterior dimensions	38" × 38" × 78"	48" × 44" × 78"	72" × 46" × 78"	48" × 48" × 83"	72" × 48" × 83"
Infrared electrical	120V / 15A	120V / 15A	240V / 15A	120V / 15.9A	240V / 18.8A
Max infrared temp	170°F	170°F	170°F	170°F	170°F
Traditional heater	No	No	No	1.9kW Harvia	4.5kW Harvia
Starting price	$4,695	$5,995	$6,495	$7,795	$8,995

Highly Certified Products

Finnmark Designs places a strong emphasis on product safety and third-party certification. Its infrared saunas are ETL listed, and its Spectrum Plus™ infrared heaters are UL listed.

Why does that matter? Independent safety certifications provide an added level of confidence that key electrical components and complete sauna systems have been evaluated against recognized safety standards. That can be especially important when comparing premium infrared saunas, where construction quality and electrical design vary significantly across the market.

You may pay more for a sauna with third-party safety certifications, but for a high-powered electrical product used in the home, documented testing and certification are meaningful factors to consider alongside price, features, and design.

When comparing infrared saunas, ask manufacturers which certifications apply to the complete sauna and which apply to individual components such as heaters and controls. For additional consumer education on sauna construction and safety, you can also review the Infrared Sauna Foundation.

Which Finnmark infrared sauna should you choose?

FD-1: Best for a compact solo setup

The FD-1 is the smallest footprint in the lineup and runs on a standard 120V/15A circuit. View the Finnmark FD-1.

FD-2: Best for most two-person home setups

The FD-2 adds useful interior space while retaining straightforward 120V/15A electrical requirements. View the Finnmark FD-2.

FD-3: Best when you want more room

The FD-3 expands to 3–4 person capacity and requires 240V/15A service. View the Finnmark FD-3.

FD-4 Trinity: Best compact hybrid

The FD-4 combines infrared, red light, and a traditional Harvia heater in a compact two-person format. View the Finnmark FD-4 Trinity.

FD-5 Trinity XL: Best large hybrid

The FD-5 expands the Trinity concept to a four-person cabin with 240V infrared power and a 4.5kW traditional Harvia heater. View the Finnmark FD-5 Trinity XL.