Traditional vs Infrared Sauna: The Honest Buyer's Guide
The famous health research was done on traditional saunas, not infrared, and the infrared brands cite it anyway. Here is the honest comparison, plus why cheap saunas are a bad idea.
The studies showing big drops in heart-disease and dementia risk were all done on traditional saunas at 175 to 195 degrees. Infrared runs cooler (110 to 140), heats your body directly, and has a much thinner evidence base. For a serious home sauna, traditional wins. Infrared makes sense only if you cannot run 240-volt power, have no space, or need a gentler heat. The cheapest infrared boxes are the worst buy, because you spend 30 minutes breathing the glue off the plywood they are built from.
- The Laukkanen study (1,688 people, 15-year follow-up) found 4 to 7 traditional sauna sessions a week tracked with 70% lower cardiovascular mortality.
- Those studies were run on traditional saunas at about 174 degrees with steam, and the authors state they do not apply to infrared.
- Traditional saunas run 176 to 212 degrees; infrared saunas run 113 to 140.
- A 2018 review of 40 sauna studies found most infrared studies had under 30 participants and not yet enough evidence to distinguish infrared from traditional.
- A 5-degree temperature rise can nearly double formaldehyde off-gassing from plywood glue, which is why cheap saunas are a real inhalation risk.
How they actually work
A traditional sauna heats the air to 176 to 212 degrees with a stone-topped heater; you pour water on the rocks for steam. Your body heats because the air is hot. An infrared sauna skips the air, using panels that heat your tissue directly while the cabin stays cool, 113 to 140. Traditional heats the room; infrared heats you.
The research nobody markets honestly
The serious, long-term evidence comes almost entirely from traditional saunas. The Finnish studies followed 1,688 people for 15 years and found up to 70% lower cardiovascular mortality and 66% lower dementia risk, at around 174 degrees. Infrared's evidence is thin (mostly studies under 30 people). So when an infrared brand cites the heart-disease numbers, they are borrowing the credibility of traditional research for a device that never reaches those temperatures.
Why cheap saunas are a bad idea
A sauna is a sealed hot box you breathe inside for half an hour. Cheap units, especially cheap infrared boxes, are often plywood or MDF glued with formaldehyde adhesive. Heat accelerates off-gassing, venting formaldehyde and benzene into your air. Quality builds use solid low-resin wood (spruce, cedar, hemlock, or thermally modified) with no toxic glue in the hot room.
| Tier | What | Price |
|---|---|---|
| Cheap infrared box | plywood, plug-in (avoid) | $1,500–4,000 |
| Quality traditional / barrel | solid wood, Finnish heater | $5,000–15,000 |
| Premium outdoor cabin | luxury wood + heater | $15,000–35,000 |
| Ultra-luxury / designer | Klafs S11 from $80,000 | $35,000–80,000+ |
For a serious home sauna, buy traditional. Infrared only if you can't run 240V or need a gentle heat. Do not buy a cheap infrared box.
A custom traditional sauna, clean wood, real heater, no VOC plywood, no four-times brand markup. Made to order.
Is a traditional or infrared sauna better?+
For most serious buyers, traditional. The health research was done on traditional saunas at 175 to 195 degrees and the authors say it does not apply to cooler infrared. Infrared suits apartments and heat-sensitive users but has a thinner evidence base.
Are infrared saunas as good as traditional for health?+
Not on current evidence. Infrared studies are mostly small and short; a 2018 review found not yet enough evidence to say infrared matches traditional.
Why are cheap saunas a problem?+
They are often plywood or MDF with formaldehyde glue. Heat nearly doubles off-gassing, so you breathe VOCs in a hot enclosed space. Quality builds use solid low-resin wood with no toxic glue.