Why Finnmark Infrared Heaters Are the Best Infrared Sauna Heaters Available

Choosing an infrared sauna is only as good as choosing the infrared heaters inside it. The heater technology determines how hot the sauna gets, how deeply you sweat, how effective the therapy is, and ultimately whether the sauna delivers real benefits—or just feels warm.

Finnmark Designs has spent years engineering infrared heaters that outperform nearly everything else on the market. Below, we break down exactly what makes Finnmark Infrared Heaters different, what to look out for when shopping, and why heater quality matters more than brand names or cabin size.

Certifications: Heater Safety Actually Matters

Finnmark Designs is one of the only infrared sauna manufacturers with certified infrared heaters, not just certified sauna cabins.

All Spectrum Plus™ Infrared Heaters are UL Listed, meaning they are tested and approved by Underwriters Laboratories, the most respected safety certification organization in the world. UL listing confirms that the heaters meet strict electrical, thermal, and fire safety standards.

While many sauna brands advertise ETL certification for the sauna, very few certify the heaters themselves. Finnmark infrared saunas are ETL certified, and their infrared heaters are UL listed, making both the sauna and its core heating components among the safest available.

170° in Less Than 1 Hour — No Electrician Required

Heat matters, but how fast you reach therapeutic temperatures matters just as much.

Finnmark infrared saunas are engineered to reach a full 170°F in less than one hour using advanced full spectrum heater technology. This level of heat is achieved on a standard home electrical outlet, with no special wiring and no electrician required.

Most infrared saunas either take significantly longer to heat up or require higher electrical demands. Finnmark’s combination heater design delivers maximum therapeutic heat efficiently, allowing you to spend less time waiting and more time sweating.

Wood Slats: Don’t Block the Infrared You’re Paying For

One of the most overlooked design flaws in infrared saunas is excessive wood slat coverage over the heaters.

Infrared heat works by emitting wavelengths that must reach your body. When manufacturers cover 80% or more of the heater surface with wood slats, those wavelengths are blocked—dramatically reducing effectiveness.

Finnmark Designs intentionally minimizes obstruction over their heaters, allowing infrared energy to fully reach the user. If most of the heater is hidden behind wood, you’re paying for technology you’ll never feel.

High Temperatures: Real Benefits Start Above 160°F

Many infrared saunas struggle to reach meaningful temperatures.

• Standard carbon infrared heaters typically max out at 140–150°F
• They often take 60–90 minutes to get there
• Scientific research shows heat shock proteins and key sauna benefits do not activate until at least 160°F

Finnmark infrared saunas consistently reach 170°F, typically within the first hour. These higher temperatures are essential for:

• Profuse sweating
• Increased heart rate response
• Higher core body temperatures
• Heat shock protein activation

If a sauna can’t reach these temperatures, it limits the benefits—no matter how comfortable it feels.

Combination Therapy: Short Wave + Long Wave Infrared

Why settle for a sauna with only one type of infrared heater?

Finnmark Designs uses Combination Infrared Therapy, integrating:

• Spectrum Plus™ Short Wave (Near Infrared) heaters strategically positioned for deep tissue penetration and targeted pain relief
• Spectrum Long Wave Carbon Panels on the left and right sides for full-body, evenly distributed detox heat

This design delivers the benefits of both deep penetrating heat and consistent ambient infrared warmth, creating a more complete and therapeutic sauna session.

High-Tech Incoloy Infrared Heater Technology

Finnmark’s Spectrum Plus™ heaters are engineered using advanced Incoloy heating technology, inspired by traditional rock sauna heating elements.

This design produces a cleaner, more natural infrared output than typical ceramic or carbon heaters while achieving significantly higher heater surface temperatures. The result is faster heat-up, deeper penetration, and more efficient therapeutic sessions.

Independent testing shows Spectrum Plus™ heaters can deliver up to 25× deeper sweat than standard carbon infrared heaters.

Low EMF Technology: Honest Testing Matters

All Finnmark infrared heaters are independently tested at a NASA award-winning EMF testing facility.

Many manufacturers manipulate EMF results by:

• Testing from unrealistic distances
• Measuring only select points
• Controlling test conditions to force low readings

Finnmark does not dictate testing outcomes. Their heaters are evaluated using real-world positioning and transparent methods. Download Finnmark Designs EMF testing report here.   

When shopping for infrared heaters:

• Always request the full EMF test report
• Be cautious of vague “low EMF” claims without documentation

Medical-Grade LED & 650nm Red Light Therapy

Finnmark infrared saunas go beyond heat therapy with medical-grade LED chromotherapy, including true 650nm red light therapy.

Near-infrared LED ceiling lights work in tandem with infrared heaters to support cellular health, circulation, and recovery. Users can choose from multiple color therapy options, enhancing both relaxation and therapeutic outcomes.

Cedar Interior & Thermal Plus™ Exterior

Finnmark saunas feature an antimicrobial Western Canadian cedar interior that naturally resists mold, bacteria, and fungus.

The exterior is constructed using Thermal Plus™ materials engineered to never rot, warp, decay, or chip—ensuring long-term durability and a healthier sauna environment.

Emissivity: The Science Behind a Deeper Sweat

Emissivity is one of the most important—and least understood—factors in infrared heater performance.

Higher emissivity means more infrared energy is delivered efficiently to your body, resulting in deeper heat absorption and more intense sweating.

Finnmark Designs infrared heaters achieve over 90% emissivity on both Spectrum Plus™ and Spectrum Carbon™ heaters—among the highest levels available in infrared sauna technology.

Upfront & Ethical Warranty

Finnmark Designs believes in transparency. While many brands advertise “limited lifetime warranties,” Finnmark provides clear, honest coverage.

The sauna cabin is covered for 10 years, and Spectrum Plus™ infrared heaters include an unconditional lifetime warranty. No fine print. No misleading language.

They Are the Manufacturer

Finnmark Designs engineers, manufactures, and tests their infrared saunas in-house.

This vertical integration ensures complete quality control, continuous innovation, and the highest therapeutic standards—something rebranded or white-label saunas simply cannot offer.

Final Thoughts: What to Look for in Infrared Heaters

When shopping for an infrared sauna, make sure the heaters meet these criteria:

• Certified heaters, not just certified cabins
• Minimal wood obstruction over heating elements
• Ability to reach 165–170°F
• Combination short wave and long wave infrared therapy
• Independent, transparent EMF testing
• High emissivity for deeper sweating

Finnmark Designs has gone to extraordinary lengths to engineer the best infrared heaters in the industry. Every detail—from materials to placement to testing—exists to deliver the safest, most effective, and most rewarding infrared sauna experience possible.