Traditional saunas heat the air in an enclosed room using an electric heater, wood-burning stove, or gas heater loaded with rocks. The air temperature climbs to 150–195°F (65–90°C), and you can pour water over the rocks to create steam — known as löyly in Finnish — which increases perceived heat and humidity. Your body heats through convection (hot air) and radiation (from the heater and hot surfaces).

Infrared saunas use panels that emit far-infrared light — a wavelength of electromagnetic radiation that penetrates the skin by 1.5–2 inches and heats tissue directly, rather than heating the surrounding air[10]. The cabin temperature stays much lower (120–150°F), but your core temperature still rises because the infrared energy is absorbed directly by your body.

The fundamental difference: traditional saunas heat you from the outside in (air heats skin, skin heats core), while infrared saunas heat you from the inside out (infrared penetrates skin, directly warms tissue). Both raise core body temperature by 1–2°C, triggering the sweating and cardiovascular responses that drive health benefits.

For a complete breakdown of sauna health research, see our sauna health benefits guide.

The experiential difference between the two types is dramatic. A traditional sauna at 180°F hits you like a wall of heat — the air is thick, breathing feels heavy, and you'll be dripping sweat within 5–10 minutes. Adding water to the rocks creates a burst of intense steam that momentarily spikes perceived temperature. Sessions typically last 15–20 minutes before you need to cool down.

An infrared sauna at 135°F feels gentler and more gradual. The air doesn't feel oppressively hot — you might sit comfortably for 10 minutes before sweating begins. But once the infrared energy penetrates your tissue, the sweating becomes deep and sustained. Sessions run longer: 30–45 minutes is standard, and many users read, meditate, or work on a laptop during the session.

Sweat composition also differs slightly. Traditional saunas produce more volume of sweat more quickly due to the higher ambient temperature. Infrared saunas produce a slower but potentially deeper sweat — some researchers suggest infrared-induced sweat contains a higher percentage of toxins relative to water, though this claim requires more rigorous study[6].

Both types of sauna deliver meaningful health benefits, but the strength of evidence differs by outcome. A 2018 systematic review of dry sauna bathing found consistent improvements across cardiovascular markers, respiratory health, chronic pain, and mental health[7].

Traditional saunas dominate the epidemiological research. The Finnish KIHD study — the largest and longest-running sauna study in the world — tracked 2,315 men for over 25 years and found that frequent sauna users (4–7 sessions/week) had a 63% lower risk of sudden cardiac death, 40% lower all-cause mortality, and 66% lower dementia risk[1][2].

Infrared saunas have a smaller but rapidly growing evidence base, with particular strength in pain management, cardiovascular risk factor reduction, and autoimmune conditions[9]. The lower operating temperature makes infrared more accessible for people who can't tolerate extreme heat.

For a deep dive into the full spectrum of sauna research, see our sauna health benefits guide. If you're considering combining sauna with cold exposure for enhanced benefits, read our contrast therapy guide.

Traditional sauna evidence: The KIHD study remains the gold standard. Men using saunas 4–7 times per week had a 50% lower risk of fatal cardiovascular disease compared to once-weekly users[1]. Sessions longer than 19 minutes at 174°F+ showed the strongest dose-response relationship. The mechanism involves repeated vasodilation, reduced arterial stiffness, improved endothelial function, and lower resting blood pressure.

Infrared sauna evidence: A 2009 review in Canadian Family Physician found that far-infrared sauna therapy improved blood vessel function in patients with coronary risk factors, including those with congestive heart failure, diabetes, and hyperlipidemia[3]. Japanese Waon therapy studies — which use infrared saunas at 140°F for 15 minutes followed by 30 minutes of bed rest wrapped in blankets — demonstrated improved cardiac output and exercise tolerance in CHF patients.

A systematic review of far-infrared therapy confirmed benefits for cardiovascular function, including improved ejection fraction and reduced systemic vascular resistance in heart failure patients[9].

Bottom line: Both types improve cardiovascular health. Traditional has stronger epidemiological evidence (larger studies, longer follow-up). Infrared has demonstrated clinical utility specifically in patients with existing heart disease who may not tolerate the extreme heat of a traditional sauna.

This is where infrared saunas have arguably the strongest clinical edge. A 2005 study on repeated thermal therapy (Waon therapy using far-infrared) found significant reductions in chronic pain scores after just 4 weeks of daily sessions[4]. Pain scores dropped by approximately 50%, and improvements persisted even after the treatment period ended.

Fibromyalgia patients also showed meaningful improvement with infrared sauna therapy. A 2008 study reported that Waon therapy reduced pain by 11–70% across participants, with concurrent improvements in fatigue and sleep quality[5]. The proposed mechanism involves reduced oxidative stress, improved peripheral blood flow, and modulation of pain-signaling pathways.

The far-infrared wavelength appears to have direct anti-inflammatory effects at the cellular level. A 2012 review documented how FIR radiation reduces inflammation markers, promotes wound healing, and modulates immune cell activity[10].

Traditional saunas also help with pain through increased blood flow and heat shock protein activation, but the published clinical trial data for chronic pain specifically is stronger on the infrared side. For how heat therapy combines with cold for enhanced recovery, see our brown fat activation guide.

Both sauna types induce heavy sweating, and a 2012 systematic review confirmed that human sweat does contain measurable quantities of arsenic, cadmium, lead, and mercury[6]. In some participants, sweat concentrations of certain heavy metals exceeded blood and urine levels, suggesting that sweating may serve as a meaningful excretion pathway.

Some proponents claim that infrared saunas produce "deeper" detoxification because the infrared energy penetrates tissue directly, potentially mobilizing toxins stored in subcutaneous fat. While the mechanism is plausible, rigorous head-to-head studies comparing sweat composition between infrared and traditional saunas are limited.

For skin health, both types increase circulation to the skin, promote collagen production through mild heat stress, and clear pores through sweating. Traditional saunas with steam (löyly) add a humidity component that some users find beneficial for hydrating skin. Infrared's lower temperature means less thermal stress on sensitive skin, which may be preferable for people with rosacea or other heat-sensitive conditions.

Important context: The liver and kidneys are your body's primary detoxification organs. Sweating is a supplementary pathway — valuable but not a substitute for healthy liver function. Claims that any sauna "detoxifies" your body should be understood in this context.

Both sauna types elevate heart rate and metabolic rate, burning calories above your resting baseline. A 2019 study measured acute body mass loss in sauna users, confirming significant fluid and caloric expenditure during sessions[8]. However, most of the weight lost during a sauna session is water — it returns when you rehydrate.

Traditional saunas typically produce a higher calorie burn per session (estimated 300–600 calories) due to the more aggressive cardiovascular demand from higher temperatures. Heart rate in a traditional sauna at 180°F can reach 120–150 bpm — comparable to moderate exercise.

Infrared saunas produce a more moderate calorie burn (estimated 200–400 calories per session), but sessions are typically longer. The net difference per week may be smaller than it first appears if you account for session length.

Neither sauna type is a shortcut for weight loss. The real metabolic benefits of regular sauna use are improved insulin sensitivity, reduced systemic inflammation, and enhanced cardiovascular conditioning — factors that support long-term metabolic health rather than acute fat burning. For how cold exposure adds metabolic benefits through brown fat activation, see our brown fat activation guide.

Infrared saunas win on convenience and cost by a significant margin. They're easier to install, cheaper to run, and require less space. Traditional saunas offer a more immersive, culturally authentic experience — the steam, the ritual of pouring water on rocks, the intense heat — but at higher upfront and ongoing cost.

For our expert picks across both categories, see our best infrared saunas and best premium saunas buyer guides. Can't fit a sauna at home? Find one near you in our sauna directory.

There is no universally "better" sauna — the right choice depends on your priorities. Here's a decision framework:

Whichever type you choose, the most important factor is consistency. The Finnish research showing dramatic health outcomes involved people who used saunas 4–7 times per week for years or decades. A sauna you'll actually use regularly beats the theoretically "optimal" one you use once a month.

For a structured protocol that combines sauna with cold plunging for maximum health benefits, see our contrast therapy guide or track your sessions with the Hot Cold Coach App. For balancing sauna practice with a demanding schedule, read our sauna and cold plunge work-life balance guide.