Low EMF Infrared Sauna

Shop for an infrared sauna for more than ten minutes and you will meet the letters EMF. Some listings promise "low EMF," some say "near-zero," and a few say "zero." These are marketing phrases, not grades. This guide explains what EMF is, what the unit on the label means, what large health agencies say about the research, and how to read a claim before you rely on it.

Disclosure: we promote Plunge and earn a commission if you buy through our links. We did not test any sauna, and we did not measure any field ourselves. Everything about Plunge below is what Plunge states on its own pages, read on 2026-10-28.

What EMF means

EMF stands for electric and magnetic fields. Wherever electricity flows, both kinds of field exist close to the wires and devices that carry it. The World Health Organization describes these as extremely low frequency (ELF) fields when they come from household electricity. The National Cancer Institute defines ELF fields as those with frequencies of up to 300 cycles per second, or 300 hertz, and lists power lines, electrical wiring and household appliances as common sources.

An infrared sauna is an electrical appliance with heaters, a controller and wiring, so it produces a magnetic field near those parts while it runs. So does a hair dryer, a refrigerator and the wall behind your bed. The question for a buyer is not whether a field exists. It is how strong the field is where you sit, and what the research says about fields of that strength.

EMF in this sense is different from the infrared light a sauna gives off. Infrared heat is a different part of the spectrum, covered in full spectrum infrared sauna.

What the milligauss (mG) unit means

Magnetic field strength is measured in two common unit families. Scientific and health-agency pages usually use tesla, more often in microtesla (µT). US consumer meters and sauna listings usually use gauss, and since household fields are small, milligauss (mG).

The WHO states the relationship as 10,000 gauss to one tesla. Working that through (our arithmetic, not a quote), one microtesla equals 10 milligauss. That gives you a way to read both kinds of source side by side:

The WHO figures are average residential levels it reports; the conversion to mG is ours. The NCI row describes where an association appeared in studies, not a line between harmful and harmless. The next section covers what that means.

One more point about units. A single mG number tells you little without three other facts: where the meter was held, whether the heaters were on, and at what setting. A reading of 0.1 mG at a spot ten inches from the panels is a different statement from 0.1 mG at the seat.

What the research says about low-frequency magnetic fields

This section is general background, not a statement about any one sauna. Read it as what the agencies say about household-level magnetic fields in general.

The WHO concludes there are no substantive health issues related to ELF electric fields at the levels members of the public generally encounter. For magnetic fields it reports a more specific finding. Studies of childhood leukaemia show a consistent pattern: children whose homes have a long-term average magnetic field above roughly 0.3 to 0.4 µT (3 to 4 mG) show about twice the leukaemia rate of other children. The WHO also says that, on balance, the evidence is not strong enough to be considered causal. It adds that if an effect exists, the biological mechanism is unknown.

The National Cancer Institute reports the same pattern from pooled analyses: about a two-fold increase at 0.4 µT or above, affecting fewer than 1 percent of children in the studies; about a 1.7-fold increase at 0.3 µT or above, affecting about 3 percent; and a smaller 1.4-fold increase in more recent studies, affecting under 0.5 percent. It also states that no consistent evidence for an association between any source of non-ionizing EMF and cancer has been found.

In 2002 the International Agency for Research on Cancer classified ELF magnetic fields as "possibly carcinogenic to humans." That category is for cases where the evidence is limited, and both the WHO and the NCI describe it as based on the childhood leukaemia studies, with no known mechanism.

What does that mean for a sauna buyer? Three things, stated plainly:

• The research is about long-term average exposure at home, mostly in children. It is not about a 30-minute session. Neither source tested infrared saunas, so none of this is a finding about infrared saunas.
• The studies are observational. They compare groups of people. They can show that two things occur together. They cannot show that one causes the other, and the agencies say so.
• The agencies do not publish a target number for you to aim for in a sauna. What they report is where associations appeared in home studies and what remains unknown.

Read honestly, the evidence does not say a sauna's field will harm you, and it does not say a very low field is certain to be harmless. If the topic matters to you for a pregnancy, a child or a medical device such as a pacemaker, ask your doctor. Do not settle it from a product page.

Why "low," "near-zero" and "zero" are not the same claim

No standard in the sources we read defines "low EMF" for consumer saunas. That means each phrase means what the seller decides it means.

• "Low EMF" can mean lower than a competitor, lower than a heater from a decade ago, or lower than the seller's earlier model. It names no number.
• "Near-zero" suggests a reading close to the floor of what a meter shows. It still needs a number, a meter name and a position to mean anything.
• "Zero EMF" or "no EMF" cannot be literal for any powered device. A heater that draws current has a field around that current. A page using these words is describing a very small reading in the loosest possible terms.

Compare this with how we handle Plunge. Plunge states a near-zero EMF rating, 0.1 mG per its Trifield meter reading. That is a stated figure from the seller, with a named meter, and we report it as Plunge's statement. We did not check it, and we cannot call it independently verified. We also do not use "no EMF" or "zero" about it.

How to read an EMF claim

Use this checklist on any sauna, ours included.

1. Who measured? The manufacturer, a third-party lab or a reviewer? A manufacturer's own reading is still useful, but it is a claim from the seller. A report from an independent lab, with the lab named and a date, is a different kind of evidence. Ask for it.
2. With what meter? A Trifield is one common handheld type. Meters differ in what they read: some report only magnetic fields, some add electric fields or radio-frequency fields. A figure labelled "EMF" without saying which field it covers is incomplete.
3. Where was it held? Magnetic fields fall off with distance from their source. The WHO notes that fields near appliances can reach a few hundred microtesla, much higher than home averages, precisely because the reading was taken close. Readings at the seat, the heaters and the power cord can all differ.
4. At what setting? Was the sauna cold, warming, or at maximum heat? Were all heaters on? A reading with the heat off proves little.
5. Is there a dated report? A claim that points to a test sheet is more checkable than one repeated across pages.

If the seller answers most of these, you have a usable claim. If it answers none, read "low EMF" as a feature name, not a measurement.

What Plunge states

Everything in this section comes from Plunge's product pages, read on 2026-10-28, and is attributed to Plunge.

Plunge states a near-zero EMF rating for its infrared saunas: 0.1 mG per its Trifield meter reading. Plunge's pages describe the heating as far-infrared panels plus full-spectrum incandescent towers.

Using the checklist above, here is what the pages we read do and do not tell you:

That is not a finding against Plunge. It is the gap between a claim and a documented measurement, and you can close it by asking. Before you buy, ask Plunge in writing where the 0.1 mG reading was taken, at what heat setting, on which model, and whether a test report exists. Keep the reply with your order.

For scale, 0.1 mG is 0.01 µT. Set against the WHO's typical home averages above, that is a small figure, and it is smaller than the 3 to 4 mG range where studies saw an association. That comparison is ours and has two limits: it relies on Plunge's number, and the studies concern long-term average home exposure, not a short session. It does not turn the number into a promise.

For prices and the model comparison, see what an infrared sauna costs.

General sauna safety

A magnetic field is only one thing to think about, and the infrared sauna benefits article covers what the research says about sessions themselves. For most people, the more practical risks of any sauna are heat and fluid loss. This section draws on Harvard Health and Cleveland Clinic guidance, and it applies to infrared and traditional saunas alike. It is general information, not medical advice.

Hydration. Harvard Health advises drinking two to four glasses of cool water after each sauna. Cleveland Clinic suggests bringing water into the sauna and drinking regularly during a session.

Time and ramp-up. Harvard Health says to stay in no more than 15 to 20 minutes and to cool down gradually afterward. For newcomers, Cleveland Clinic suggests starting at a lower temperature, around 110°F, for five to ten minutes if you have health concerns, then building up.

Alcohol and medicines. Harvard Health advises avoiding alcohol, and medications that may impair sweating and cause overheating, before and after a sauna. Ask your pharmacist or doctor whether yours are on that list.

When you are ill, or feel unwell. Harvard Health says not to use a sauna when you are ill, and to head for the door if you feel unwell mid-session. Cleveland Clinic gives the same advice for fevers and serious symptoms.

Check with a doctor first if:

• you have uncontrolled high blood pressure or heart disease (Harvard Health says to check with your doctor);
• you have any existing medical condition, or take regular medicine (Cleveland Clinic);
• you have multiple sclerosis, which a Cleveland Clinic physician does not recommend infrared saunas for, because people with MS don't usually do well in heat;
• you are pregnant or trying to conceive, which the same Cleveland Clinic source does not recommend for either partner.

In short, heat is a real physical stress, and your own health decides how much of it suits you. We cannot tell you a sauna is right for you, and no seller can either. Your doctor can.

Who this suits, and who should look elsewhere

A Plunge sauna fits a specific buyer. It suits you if you want an indoor, plug-in cabin from one company with a stated EMF figure you can question, and if your budget starts well above $7,000 (Standard $7,190, Pro $7,990, as read 2026-10-28, per Plunge). The Standard runs from a 120V outlet; the Pro needs a 240V, 20A dedicated circuit.

Look elsewhere if your budget is under about $3,000, if you want an outdoor install, if a blanket or portable unit is what you have in mind, or if you do not have a 240V circuit and want the Pro. If the EMF figure is your main reason to buy, a seller that publishes an independent lab report may meet your need better than a stated rating.

For the wider decision, our main guide to the best infrared home sauna explains how we define "best" and where Plunge sits in it. For a side-by-side with the other heat style, see infrared vs traditional sauna. Plunge's trial and return policy was not stated on the pages we read, so read it at checkout.

For the full write-up of the product itself, read the Plunge infrared sauna review. We promote Plunge and earn a commission on purchases through our links.

FAQ

What is a good EMF level for an infrared sauna?

No agency in the sources we read sets a target level for a sauna. The WHO reports typical home averages of 0.07 µT in Europe and 0.11 µT in North America, which is 0.7 and 1.1 mG by our conversion. A lower reading in the sauna than in your living room is a reasonable thing to look for, but the claim needs a meter, a position and a setting behind it.

Does a 0.1 mG reading mean there is no EMF?

No. Plunge states a near-zero EMF rating, 0.1 mG per its Trifield reading. Near-zero is not zero, and a powered heater always has a field around its current. We report it as Plunge's statement and have not verified it.

Do infrared saunas cause cancer?

We found no source saying so. The WHO and NCI discuss ELF magnetic fields in homes, mostly in relation to childhood leukaemia. They call the evidence not strong enough to be causal and say no consistent evidence has been found linking non-ionizing EMF to cancer. Neither tested infrared saunas, so that research cannot answer the question for a sauna directly. Ask your doctor if you have concerns.

Sources

• World Health Organization, Radiation and health: Exposure to extremely low frequency fields (units, typical home levels, health conclusions), https://www.who.int/teams/environment-climate-change-and-health/radiation-and-health/non-ionizing/exposure, read 2026-10-28
• National Cancer Institute, Electromagnetic Fields and Cancer, https://www.cancer.gov/about-cancer/causes-prevention/risk/radiation/electromagnetic-fields-fact-sheet, read 2026-10-28
• Harvard Health Publishing, Sauna health benefits: are saunas healthy or harmful?, https://www.health.harvard.edu/staying-healthy/saunas-and-your-health, read 2026-10-28
• Cleveland Clinic, The Benefits of Infrared Saunas (Health Essentials), https://my.clevelandclinic.org/podcasts/health-essentials/the-benefits-of-infrared-saunas, read 2026-10-28
• Plunge, The Infrared Sauna and The Infrared Sauna Pro product pages (as recorded in data/plunge.json), read 2026-10-28