Low EMF Infrared Sauna: What the Published Numbers Mean

Infrared saunas heat with electric panels, and anything carrying current makes a magnetic field. "Low EMF" is a claim about that field, and most premium brands now make it. This page covers what each maker publishes and how to read it. It makes no health claims; if EMF exposure matters to you for medical reasons, that is a question for your doctor.

What the makers publish

Clearlight also says a typical carbon heater measures 70 to 100 mG on its surface, which is the gap these brands are selling against. Sun Home posts its full lab report on its own site.

Entry prices on Oct 27, 2026: Sunlighten Signature I (1-person) $4,999, Sun Home Solstice (2-person) $6,199, Clearlight Sanctuary 2 $8,957 at Renu Therapy. The best infrared sauna guide compares them on everything else.

How to compare claims

• Where: heater surface, a fixed distance, or the seated position? Readings drop fast with distance.
• How: which meter, and RMS (averaged) or peak? Sun Home's report uses a fluxgate magnetometer and RMS.
• Under what load: all heaters on? A panel that is off reads zero.
• Who: a named lab with a dated report you can read, or a marketing line?

If you want to check a sauna yourself, a consumer gaussmeter reads milligauss. Measure where your body will be, with every heater running.

Common questions

What counts as a low EMF sauna?

There is no single standard. Sun Home's test lab, Vitatech Electromagnetics, labels 10 mG or less "ultra-low." All three brands on this page publish figures under 1 mG, measured in different places.

Which infrared sauna has the lowest EMF?

The published numbers can't rank them. Sunlighten says its heater panels measure 0.5 mG. Clearlight says under 1 mG at the heater surface and close to 0 mG at the bench. Sun Home publishes 0.3 to 0.9 mG at 3 feet from the heater. Those are different positions, so they are not a like-for-like comparison.

How is sauna EMF measured?

With a gaussmeter, in milligauss. Sun Home's report describes AC magnetic fields from 10 to 3,000 Hz, measured as RMS (an average over time, not a brief peak) with a fluxgate magnetometer while the heaters are running. Ask any brand for the same details. Which instrument, at what distance? RMS or peak? Every heater on?

Does EMF drop with distance in a sauna?

Yes, sharply. Sun Home's published readings fall from 0.6 to 4.0 mG at 1 foot to 0.3 to 0.9 mG at 3 feet. That is why the measuring position matters more than the headline number.