Both work. Both cause you to sweat. Both have associations in the literature with cardiovascular and recovery benefit. The choice between an infrared cabin and a traditional Finnish sauna is not about which is better — it is about which suits your body, your home, and the kind of session you actually want to take.
Here is the conversation in long form, written to help you make the right call for your home and your routine. Every session has a telos; the cabin you pick should match yours.
How each one heats you
Infrared
An infrared cabin uses carbon or ceramic emitter panels that radiate energy in the 5,000–14,000 nanometre band. That energy is absorbed directly by skin and the layer of tissue beneath, and it warms you without warming the air much. Cabin air sits at 50–65°C — about half the temperature of a Finnish sauna — yet sweat begins within ten minutes and runs steadily. Most modern infrared cabins use far-infrared panels; a smaller subset add near-infrared LEDs for photobiomodulation.
The mental analogy: a traditional sauna is like standing in front of an open oven — heated air around you raises your skin and core temperature indirectly. An infrared cabin is like standing in sunlight on a cool morning — the air is mild but radiant energy warms your body directly. Same physiological end-state (raised core temperature, productive sweat, vasodilation, heat-shock protein response), reached by different mechanical paths.
Traditional
A traditional sauna heats stones (the kiuas) on a thermostatically controlled electric heater. Air temperature climbs to 80–95°C. Splashing water on the stones (löyly) creates a humidity spike — a brief, soft burst of steam — which is what gives Finnish sauna its character. Heat is conducted to your body through hot air rather than radiated. The temperature comparison is stark: 50–60°C ambient with body warmed to similar core temperature via infrared, against 70–90°C ambient at the bench in a Finnish cabin.
The wood — and why it matters
Cabin wood is not a cosmetic choice. The four common species each have different smell, durability, heat behaviour, and price implications.
Hemlock is the most common wood in modern infrared cabins. It is low-aroma, hypoallergenic, dimensionally stable, and finishes to a clean light tone. Hemlock does not have the resin content that would burn or smell at infrared temperatures. It is the right choice for cabins used indoors, by allergy-sensitive users, or in homes where strong wood aromas are unwelcome. Most of our full-spectrum infrared cabins use Canadian hemlock for these reasons.
Western Red Cedar is the premium outdoor wood. It is naturally rot-resistant, contains thujaplicins that deter insects and fungi, and produces the pronounced cedar aroma that many people associate with sauna. The aroma is more intense than hemlock and some users find it strong indoors; outdoors it weathers attractively. Cedar is the dominant wood in barrel saunas and outdoor garden cabins, because it survives UK weather without preservatives.
Aspen is the traditional Finnish choice for sauna interiors. It is light-coloured, low-resin, and crucially it does not get hot to the touch — bench surfaces at 90°C ambient are still bearable to sit on bare-skinned. Aspen has almost no aroma and tends to be paler than hemlock or cedar. It is the right wood for the bench surfaces of any traditional Finnish sauna, regardless of what the structural walls are made of.
Spruce is the Scandinavian outdoor and traditional sauna wood. It is resinous, fragrant, and produces the smell most often associated with Finnish wood-fired saunas. Spruce expands and contracts more than hemlock or cedar, which is why it is more often used as cladding than as interior bench surface. Wood-fired barrel saunas often combine spruce exterior with aspen bench tops.
Time to first sweat
Infrared: seven to twelve minutes from cold cabin. Traditional: twenty to thirty minutes from cold cabin (the heater needs time to bring stones up to temperature). If your routine is short, infrared is more practical. If you treat your sauna as a slower, more ceremonial part of the day, the traditional warm-up is part of the experience.
Heat-up time and session economics
| Cabin | Power | Cold-start to usable | Total session |
|---|---|---|---|
| 1-person infrared | 1.5 kW | 5–8 min | 30 min |
| 2-person infrared | 2.5 kW | 8–12 min | 35 min |
| 4-person infrared | 3.5 kW | 15–20 min | 45 min |
| Traditional 6 kW (2-person) | 6.0 kW | 30–45 min | 60 min |
| Traditional 9 kW (4-person) | 9.0 kW | 25–35 min | 75 min |
| Wood-fired barrel | n/a (wood) | 60–90 min | 90–120 min |
The implication is simple: if you are squeezing a 30-minute session in before work or after the school run, infrared wins on time-to-usable by a clear margin. If your sauna is part of a longer evening or weekend ritual, the traditional warm-up is part of the experience rather than a cost.
UK install reality — what your electrics need to handle
This is where infrared has a genuine practical advantage in a UK home, and it is the single most underestimated cost in the buying decision.
Most 1- and 2-person infrared cabins draw 1.5–2.5 kW at peak and run from a regular 13A socket on an existing ring main without modification. Plug it in, switch on, you are sauna-ready that evening. A 4-person cabin draws closer to 3.0–3.5 kW and is best given a dedicated 16A or 20A spur — typically £150–£250 for an electrician's afternoon if you do not already have one.
A traditional Finnish sauna heater is far hungrier. A 1-person traditional cabin uses a 4.5 kW heater. A 2-person needs 6 kW. A 4-person family cabin uses 8–9 kW. None of those run on a standard UK socket. All need a dedicated 32A or 40A blue commando spur run from the consumer unit, which means an electrician, a Part P notification (in England and Wales), and potentially a fuseboard upgrade if your existing consumer unit is older than the 17th edition. Budget £400–£900 for that work on top of the cabin price.
Outdoor installation adds a layer. Any outdoor sauna — infrared or traditional — needs a weatherproof IP-rated install with RCD protection at the supply socket. Garden trenching for an SWA cable adds another £200–£500 if the cabin is more than 20 metres from the house. Outdoor saunas tend to ship pre-wired internally, but the supply from the house to the cabin is your responsibility (or your electrician's).
| Cabin type | Power draw | UK socket needed | Approx electrician cost |
|---|---|---|---|
| 1-person infrared | 1.5 kW | Standard 13A | £0 (existing) |
| 2-person infrared | 2.5 kW | Standard 13A | £0 (existing) |
| 4-person infrared | 3.5 kW | 16A or 20A spur | £150–£250 |
| Sauna blanket | 0.6 kW | Standard 13A | £0 |
| Traditional 1-person (4.5 kW) | 4.5 kW | 16A spur | £200–£350 |
| Traditional 2-person (6 kW) | 6.0 kW | 32A blue commando | £400–£600 |
| Traditional 4-person (8–9 kW) | 8.0–9.0 kW | 32–40A spur, possible fuseboard upgrade | £500–£900 |
| Wood-fired barrel | n/a (wood) | Optional 13A for lighting | £0–£150 |
Sensation
If you have sat in a Finnish sauna, you know it: the air is hot, your inhale feels warm, and löyly briefly raises the perceived temperature high enough that you have to lean forward and breathe through pursed lips. It is intense and ceremonial.
Infrared is the opposite. The air is bearable; you can read a book; you can hold a conversation in a normal voice. The sweat is just as real, but the experience is gentler and more sustained. Many people who find traditional saunas overwhelming get on better with infrared. Many who love the punch of löyly find infrared underwhelming.
Sweat, sensation, and what your skin feels
The skin's experience of these two modalities is genuinely different. Infrared sweat tends to start gradually — ten or twelve minutes in — and run steadily for the rest of the session. The cabin air is breathable; you can sit upright and stretch. Longer sessions of 30–40 minutes feel comfortable. The post-session feeling is one of slow rise and gentle release rather than a jolt.
Traditional sauna sweat is faster and more intense. Sitting on the upper bench with the heater fully up and löyly hitting the stones, sweat is pouring within four or five minutes. Sessions are typically shorter — 12 to 20 minutes per round — because the intensity is higher. The contrast with cold-water immersion afterwards is sharper, more primal, more punctuating.
For UK climate context: traditional sauna feels more "right" on a January evening when the cabin's intensity matches the cold outside. Infrared feels more "right" as a daily habit because the gentler ramp accommodates a routine session before work or in the middle of an ordinary afternoon. Neither preference is the correct one — they map to different lifestyle patterns.
The mitochondrial angle — what biohackers focus on
The cellular biology of heat exposure is one of the more interesting areas of recent research. Heat shock proteins (notably HSP70 and HSP90) are upregulated in response to acute heat stress. They function as molecular chaperones, repair misfolded proteins, and have been associated in animal models with mitochondrial biogenesis and longevity pathways. Repeated heat exposure also drives hormesis — the phenomenon by which low-grade stress, applied in the right dose, produces adaptations that improve resilience.
The most cited human evidence is Laukkanen et al. 2015 in JAMA Internal Medicine, the 20-year Kuopio cohort. That work observed associations between regular sauna use — particularly 4–7 sessions a week — and lower cardiovascular mortality, lower stroke risk, and lower all-cause dementia incidence. Effect sizes were striking; the study was observational, not interventional, so causation is inferred rather than proven.
The Laukkanen data is from traditional Finnish saunas. Infrared has a smaller body of evidence. Emerging trials in heart failure (Tei and colleagues, the Waon-therapy programme out of Japan) suggest comparable cardiovascular adaptations from infrared. Sweating, vasodilation, and heat-shock protein response appear similar at equivalent core-temperature elevation. The honest summary: traditional sauna has the larger evidence base, infrared has the more practical home delivery, and the mechanistic case for both rests on the same physiology.
Rhonda Patrick's 2018 review summarises the case in detail; her position — that the heat-shock and cardiovascular literature transfers reasonably to infrared at equivalent core temperature elevation — is now broadly accepted, with the caveat that direct outcome data on infrared is still developing.
The skin / collagen angle — what RLT-integrated infrared adds
One thing infrared cabins can do that traditional cannot is integrate red light therapy (RLT) panels. Near-infrared (810–850 nm) and red (660 nm) light wavelengths have a documented effect on collagen synthesis and skin biology. Wunsch & Matuschka 2014 showed that twice-weekly RLT exposure over 30 sessions produced measurable improvements in collagen density and skin smoothness in a controlled cohort.
The mechanism centres on cytochrome c oxidase in mitochondria absorbing photons at these wavelengths, which increases ATP production and downstream signalling that supports tissue repair. The dose-response curve is well-mapped; the effects are modest but real and reproducible.
Most modern infrared cabins now offer optional RLT panels integrated into the wall — see our red light therapy sauna range. The combination delivers the heat-shock benefit of an infrared session and the photobiomodulation benefit of dedicated RLT in one sitting. Traditional saunas cannot incorporate this — the temperatures are too high for the LED panels to operate reliably.
The physiological evidence — broader picture
Beyond Laukkanen and the Waon-therapy work, the literature supports both modalities as effective tools for cardiovascular conditioning, recovery, and metabolic adaptation. Hussain & Cohen 2018's clinical review covers the broader evidence base. The mechanisms — vasodilation, heat-shock response, cardiovascular conditioning, autonomic balance — operate similarly across modalities at equivalent core temperature elevation.
What the literature does not yet support strongly: infrared as a "detox" pathway (no mechanistic basis beyond ordinary sweat), infrared as a weight-loss tool (water loss is rapid; fat loss is not), or any sauna modality as a treatment for specific clinical conditions outside of the cardiovascular research. The honest framing: both are well-supported as part of a healthy adult routine, not as a substitute for clinical care.
5-year cost of ownership — both options
The headline running-cost comparison hides as much as it reveals. The full cost of ownership over five years includes capex, install, electricity, and replacement parts. Below is the comparison for a typical UK household using a 2-person cabin three times a week.
| Cost item | 2-person infrared | 2-person traditional Finnish | Wood-fired barrel |
|---|---|---|---|
| Cabin (capex) | £900–£1,800 | £2,400–£4,500 | £2,500–£3,500 |
| Electrician install | £0 (13A) | £400–£600 (32A spur) | £0–£150 (lighting only) |
| Heater / panel replacement reserve | £200 (year 5–7) | £300 (heater element, year 5) | £0 (stove) |
| Electricity, 3 sessions/week × 5 years | £300 (£60/yr) | £1,100 (£220/yr) | £0 |
| Wood (wood-fired only) | £0 | £0 | £600–£1,500 (£120–£300/yr) |
| Maintenance, cleaning, lighting | £100 | £200 | £200 |
| 5-year total | £1,500–£2,400 | £4,400–£6,700 | £3,300–£5,350 |
The headline finding most buyers find surprising: a traditional Finnish sauna in the UK costs roughly twice as much over five years as an infrared cabin of equivalent capacity, driven by the install cost and the four-times-higher electricity bill. The wood-fired barrel sits in the middle — high capex but no ongoing electricity bill, with seasoned firewood as the variable.
Install complexity, side-by-side
| Infrared | Traditional | |
|---|---|---|
| Cabin assembly time | 2–4 hours, two people | 3–6 hours, two people |
| Electrical work | 13A or 16A — usually existing socket | 32A spur from consumer unit |
| Ventilation | Optional | Required (intake low, exhaust high) |
| Floor protection | Tile, vinyl, sealed timber all fine | Tile or stone preferred |
| Building Regulations | None | Part J relevant if heater is wood-fired; Part P for any new circuit |
Who should pick which — by household
The decision often comes down to space, lifestyle, and electricity. The mapping below covers the common UK profiles.
- Couple in a flat: 1- or 2-person infrared cabin. Plug-and-play, no electrician, fits a spare bedroom or utility room corner. 1-person or 2-person infrared.
- Family in a house with garden: 4-person infrared indoors, or a barrel sauna outdoors. The barrel keeps the heat out of the house and gives a more "ritual" experience; the infrared is more practical for a daily habit. Barrel saunas or 4-person infrared.
- Serious biohacker: full-spectrum infrared cabin with integrated RLT, paired with a cold plunge for contrast therapy. Most data-driven combination. RLT-integrated infrared.
- Wellness-focused individual on a budget: sauna blanket as an entry point, with an upgrade path to a 1-person cabin once the habit is established. Sauna blankets.
- Traditional sauna purist: outdoor wood-fired barrel, the closest experience to true Finnish sauna available in a UK garden. Wood-fired saunas.
- Indoor traditional fan: 4–6 kW electric heater in a dedicated indoor cabin, ideally in a basement or outbuilding with separate ventilation. Budget for the install.
What suits a UK home
If you live in a flat, share electrical supply with a building, or want to use the cabin daily before work, infrared wins on practicality. If you have a dedicated outbuilding, the budget for a 32A spur, and you treat sauna as a slow-evening ritual rather than a 25-minute reset, traditional wins on character. We sell both for that reason. The category that suits the largest share of UK households is the 2-person infrared cabin — small enough to fit a spare bedroom or dry garage corner, frugal on electricity, and ready in under fifteen minutes.
The takeaway
Infrared and traditional are not in competition; they are different shapes for different routines. Infrared is the daily-driver: faster to warm up, cheaper to run, friendly to UK wiring, gentler to sit in, capable of integrating red light therapy. Traditional is the ritual: hotter, slower, more dramatic, demanding more from the building, with the larger evidence base in cardiovascular outcomes. Pick based on how often you will actually use it and what the room can support.
Asked & answered
Is infrared better for skin?
Infrared with integrated red light therapy panels has documented effects on collagen density that traditional sauna does not have. Heat alone — infrared or traditional — improves circulation to the skin and supports a healthy glow. The collagen-specific benefit comes from the 660 nm and 810–850 nm wavelengths in RLT panels, which only infrared cabins can integrate.
Does traditional sauna burn more calories?
Marginally. The higher ambient temperature and longer warm-up mean traditional sauna sessions involve more total energy expenditure for the body. The difference is modest — perhaps 50–100 extra kilocalories per session — and is not a meaningful weight-loss strategy in either modality.
Can I install a traditional sauna myself?
You can assemble the cabin yourself. The electrical supply for any heater above 4.5 kW must be installed by a qualified electrician and notified under Part P (in England and Wales). DIY installation of the 32A spur itself is not legal for a homeowner.
Why are infrared saunas low-EMF?
Carbon panel emitters produce significantly lower electromagnetic field readings than older ceramic-rod heaters. Modern Telos cabins are rated below 3 mG (milligauss) at sitting position, well within the building biology safe range. EMF from a sauna is a secondary concern compared with the heat exposure itself, but it is reasonable to choose low-EMF panels if you want one less variable.
Which is better for muscle recovery?
Both work. Infrared is gentler and more practical for daily post-workout use. Traditional gives a sharper bite and pairs more dramatically with a cold plunge for contrast therapy. Sports-medicine literature on heat-based recovery uses both modalities; effect sizes are similar at equivalent core temperature elevation.
Will my UK electrics handle a 9 kW heater?
Probably not without modification. A 9 kW heater needs a 40A spur from the consumer unit and a fuseboard rated for the additional load. Many older UK consumer units (16th edition, pre-2008) need an upgrade to handle this; newer units typically have spare capacity. Have an electrician survey the consumer unit before committing to a 9 kW model.
Do infrared saunas need a special socket?
Most do not. 1- and 2-person cabins (under 3 kW) run from a standard 13A socket. 4-person cabins (3.0–3.5 kW) often need a dedicated 16A spur. Always check the cabin spec sheet against the available socket capacity in the room.
Do infrared saunas use less electricity than traditional?
Yes — typically a third to a half. A 30-minute session in a 2-person infrared draws 1.0–1.4 kWh; a 30-minute session in a 2-person traditional draws around 3.0 kWh once warm-up is included.
Is the heat in infrared less effective?
Different, not less. Core temperature rise is comparable for equivalent session length, and sweating is just as productive. The subjective feeling is gentler because air temperature is lower.
What about steam saunas?
A steam sauna (often called a hammam or steam shower) is a third category — air at 45–55°C with near-100% humidity. It is closer in sensation to a Turkish bath than to either Finnish or infrared. Some households install both an infrared and a steam unit; few install all three.
Will an infrared cabin fit through a UK door?
Most 1- and 2-person infrared cabins ship as flat panels and assemble inside the room, slotting through a standard 76 cm internal door without trouble. 4-person cabins sometimes need to be assembled in the room they will live in. Measure twice, deliver once.
References
- Laukkanen, T., Khan, H., Zaccardi, F., & Laukkanen, J.A. (2015). Association between sauna bathing and fatal cardiovascular and all-cause mortality events. JAMA Internal Medicine, 175(4), 542–548. PubMed
- Hussain, J., & Cohen, M. (2018). Clinical effects of regular dry sauna bathing: a systematic review. Evidence-Based Complementary and Alternative Medicine. PubMed
- Wunsch, A., & Matuschka, K. (2014). A controlled trial to determine the efficacy of red and near-infrared light treatment in patient satisfaction, reduction of fine lines, wrinkles, skin roughness, and intradermal collagen density increase. Photomedicine and Laser Surgery, 32(2), 93–100. PubMed
- Patrick, R.P., & Johnson, T.L. (2021). Sauna use as a lifestyle practice to extend healthspan. Experimental Gerontology, 154. PubMed
- Tei, C., et al. (2016). Waon therapy for managing chronic heart failure — results from a multicenter prospective randomized WAON-CHF study. Circulation Journal, 80(4), 827–834. PubMed
- Beever, R. (2009). Far-infrared saunas for treatment of cardiovascular risk factors. Canadian Family Physician, 55(7), 691–696. PubMed
Still weighing it up? Book a free consultation — we will talk through your space and lifestyle and recommend the right cabin.
