Reviewed by Emily Carter, MSc, RD
Registered Dietitian & Hydration Research Specialist. Emily holds a Master of Science in Human Nutrition and has spent over a decade translating nutrition research into practical, evidence-based guidance for everyday health and athletic performance.
Quick answer: Traditional Finnish sauna has the stronger evidence base — the 20-year Finnish cohort research on longevity, cardiovascular health, and mortality risk was conducted on dry heat traditional saunas, not infrared. Infrared sauna operates at lower temperatures (50–65°C vs 80–100°C), making it more accessible for beginners and people with heat sensitivity, and shows promising evidence for chronic pain and joint conditions. For most healthy adults focused on performance and long-term health, traditional sauna produces superior and better-documented benefits.
The Fundamental Difference
Traditional and infrared saunas heat the body through different mechanisms — and this difference matters more than most people realise.
Traditional sauna heats the surrounding air to 80–100°C. Your body absorbs heat from the hot air through convection and conduction. The high ambient temperature forces your cardiovascular system to work hard to dissipate heat — driving the heart rate, vasodilation, and sweat response that produce the documented health benefits. Use our sauna hydration calculator to personalise your fluid intake.
Infrared sauna heats the body directly using infrared light wavelengths — the same wavelengths emitted by the sun as radiant heat. The ambient air temperature is lower (50–65°C), but the infrared light penetrates tissue directly, heating muscles and organs from the inside rather than requiring the air to first heat up and transfer to the body. Proponents argue this produces deeper tissue heating at lower ambient temperatures.
Side-by-Side Comparison
| Factor | Traditional Sauna | Infrared Sauna |
|---|---|---|
| Ambient temperature | 80–100°C | 50–65°C |
| Heating mechanism | Convection (hot air) | Radiant infrared light |
| Perceived heat | Intense — full body, immediate | More gradual, gentler |
| Heart rate elevation | 120–150 bpm | 90–120 bpm |
| Sweat rate | Higher (400–600ml/20 min) | Lower (200–400ml/20 min) |
| Session tolerance | Harder for beginners | More accessible |
| Research depth | Extensive (20+ year cohort data) | Limited — shorter-term studies |
| Best evidence for | Cardiovascular health, longevity, performance | Chronic pain, joint conditions, accessibility |
| Installation cost | Higher (heating rocks, ventilation) | Lower (electric panels, simpler install) |
Where Traditional Sauna Has the Clear Edge
The Longevity and Cardiovascular Research
The landmark research — the Laukkanen et al. JAMA 2015 study showing 40% lower all-cause mortality and 63% lower sudden cardiac death risk in 4–7 sessions per week users — was conducted on traditional Finnish dry heat saunas. This is 20 years of population-level data. The equivalent research for infrared sauna does not exist at this scale or duration.
This does not mean infrared sauna is ineffective for cardiovascular health. It means the evidentiary bar that has been met for traditional sauna has not yet been met for infrared. For anyone prioritising evidence-based longevity practice, traditional sauna is the default choice. For the full cardiovascular evidence base, see our guide on sauna and cardiovascular health.
Cardiovascular Training Effect
The higher temperature and heart rate demand of traditional sauna produces a more pronounced cardiovascular training stimulus — comparable to moderate aerobic exercise at 120–150 bpm. Infrared sauna at 90–120 bpm produces a real but smaller cardiovascular stimulus. For plasma volume expansion, arterial compliance improvement, and the cardiac output adaptations documented in the research, higher temperature produces superior results.
Athletic Performance Protocols
The plasma volume expansion and heat acclimation benefits for athletes — documented in studies like Scoon et al. — were achieved using traditional sauna at 80–100°C. The higher thermal demand is what drives the adaptation. Athletes using sauna for performance enhancement should default to traditional sauna for this reason.
Where Infrared Sauna Has Advantages
Chronic Pain and Joint Conditions
A clinical trial by Hussain et al. (Clinical Rheumatology, 2019) found that infrared sauna produced significant pain relief and improved quality of life in patients with rheumatoid arthritis and ankylosing spondylitis — conditions where the high temperature and heat intensity of traditional sauna can be uncomfortable or contraindicated. The lower ambient temperature makes infrared sauna accessible to people with chronic pain, fibromyalgia, and heat-sensitive conditions.
Accessibility for Beginners and Heat-Sensitive Individuals
The lower ambient temperature of infrared sauna makes it significantly more tolerable for people who find traditional sauna overwhelming. For beginners building heat tolerance, elderly individuals, people with mild cardiovascular conditions (with medical clearance), or anyone who struggles with the intense heat of a traditional sauna, infrared sauna provides a lower-barrier entry point to heat therapy benefits.
Home Installation
Infrared sauna panels are easier and cheaper to install in home settings than traditional sauna setups, which require proper ventilation, heating stones, and higher power requirements. For people building home recovery setups, infrared is the more practical option — particularly as a starting point.
The Honest Verdict by Goal
| Goal | Better Choice | Reason |
|---|---|---|
| Cardiovascular health / longevity | Traditional | All major research conducted here |
| Athletic performance | Traditional | Higher cardiovascular demand drives adaptation |
| Chronic pain / joint conditions | Infrared | Clinical evidence; lower heat more tolerable |
| Beginners / heat sensitivity | Infrared | More accessible; lower barrier to entry |
| Home installation | Infrared | Simpler, cheaper setup |
| Sleep improvement | Traditional (slight edge) | Stronger core temperature cycle = stronger sleep effect |
| Relaxation / stress relief | Either | Both activate parasympathetic nervous system |
Hydration Applies to Both
Both sauna types produce significant fluid loss — though traditional sauna produces higher sweat rates (400–600ml per 20 minutes vs 200–400ml for infrared). Rehydration principles are the same: 300–400ml before entering, 300ml between rounds, 500–750ml after the final round. Add electrolytes for sessions over 45 minutes total heat time.
The Mammoth Mug 2.5L covers a full traditional sauna session's hydration needs comfortably. For infrared sauna, the Mammoth Mini 1.5L typically covers a standard session given the lower sweat rate. For the complete hydration protocol, see our guide on sauna dehydration and fluid replacement.
Attending the Mammoth Mug Sauna Rave at NRG Toronto? NRG uses traditional Finnish-style rooms — bring a 2.5L bottle for the full event.
- 7 Sauna Health Benefits Backed by Science
- Sauna vs Steam Room: Which Is Actually Better?
- Sauna and Cardiovascular Health: What 20 Years of Research Shows
- Best Water Bottle for Sauna: What to Look For
- Sauna Rave Toronto: NRG Event Guide
For a complete overview of sauna use, see our beginner guide to sauna.
Frequently Asked Questions
Does infrared sauna have the same health benefits as traditional sauna?
Some benefits overlap — both produce heat stress, cardiovascular activation, and relaxation. But the specific longevity, cardiovascular, and performance benefits documented in the Finnish cohort research were studied using traditional dry heat sauna. Infrared sauna shows promising evidence for chronic pain and joint conditions where traditional sauna is less accessible. For general health, performance, and longevity, traditional sauna has the stronger evidence base. For the full comparison, see our sauna health benefits overview.
Is infrared sauna better for weight loss than traditional sauna?
Neither produces meaningful direct fat loss — the weight loss from either is water weight. For the indirect body composition benefits (growth hormone elevation, cortisol reduction), traditional sauna produces a stronger response due to higher temperature and more intense hormonal stimulus. Neither is a direct fat loss tool; both support body composition change through indirect mechanisms when combined with appropriate diet and exercise.
Which is safer — infrared or traditional sauna?
Both are safe for healthy adults when used appropriately. Infrared sauna's lower temperature makes it less likely to cause heat-related discomfort for beginners or people with heat sensitivity. Traditional sauna at 80–100°C requires more careful pacing, particularly for first-time users. For specific health conditions — cardiovascular disease, pregnancy, heat sensitivity — consult a healthcare provider before using either type.
Can I build the same cardiovascular adaptation with infrared sauna?
Infrared sauna produces cardiovascular adaptation, but the lower heart rate demand (90–120 bpm vs 120–150 bpm for traditional) means a weaker cardiovascular training stimulus per session. You can partially compensate by increasing session length or frequency, but the adaptation plateau will likely be lower than with traditional sauna. For serious cardiovascular training benefit, traditional sauna is the more effective choice.
What about near-infrared vs far-infrared saunas?
Most home infrared saunas use far-infrared wavelengths, which penetrate tissue most deeply and produce the majority of the documented therapeutic effects. Near-infrared wavelengths are shorter, penetrate less deeply, and are used in some photobiomodulation (red light therapy) devices that are distinct from sauna use. For sauna purposes, far-infrared is the standard — near-infrared panels are a different category of device. The comparisons in this article refer to far-infrared sauna specifically.
Which type of sauna uses more electricity to operate?
Traditional electric saunas use 6–9 kW heaters and take 30–45 minutes to preheat, consuming significantly more electricity per session than infrared panels, which use 1.5–3 kW and reach operating temperature in 10–15 minutes. For home users, this difference is meaningful — a traditional sauna costs roughly $1.50–$3.00 per session in electricity, while an infrared sauna costs $0.30–$0.75. Wood-burning traditional saunas avoid electricity entirely but require wood procurement, storage, and longer preheat times.
Can you add water to the rocks in an infrared sauna?
No — infrared saunas do not have heated rocks (kiuas). The heat comes from infrared panels that emit electromagnetic radiation directly absorbed by your skin and tissues, not from heating the air. Adding water and steam (löyly) is exclusive to traditional Finnish saunas. Some people miss this ritual and find infrared saunas feel less "authentic" as a result. If the ability to adjust humidity by throwing water on stones is important to your sauna experience, a traditional sauna is the only option that provides it.
Do infrared saunas penetrate deeper into the body than traditional saunas?
Infrared manufacturers claim their wavelengths penetrate 3–4 cm below the skin surface, heating tissues directly rather than heating the air first. While infrared radiation does penetrate superficial tissue, peer-reviewed evidence on meaningful deep-tissue heating in commercial infrared saunas is limited. Traditional saunas achieve deep core temperature elevation through sustained exposure to high ambient temperature — a different mechanism that is well-documented. Both modalities raise core body temperature above 38.5°C with sufficient duration; the route to that endpoint differs but the physiological outcome is comparable.
