Infrared vs traditional sauna: which should you buy?

Buyers usually arrive at this question with the wrong frame: which one is better. Neither is. They are different products that happen to share a name, and picking wrong means either a cabin you cannot install or a heat you do not enjoy. The split comes down to one thing, which is what the heat is actually warming.

The mechanism, in one paragraph each

A traditional sauna is a heated room. An element warms a pile of stones, the stones warm the air, and the air warms you by convection. Throwing water on the stones flashes it to steam, which is löyly, and it briefly makes the room feel far hotter without changing the thermometer much.

An infrared cabin skips the air. Panels emit infrared radiation that your skin absorbs directly, so you warm up while the room stays at a temperature you could hold a conversation in. That is why an infrared session runs 40 minutes comfortably while a traditional session runs 10 to 20 minutes at a time.

Installation is the decision most people should make on

This is the practical fork, and it is worth settling before comparing anything else. Every traditional heater on the UK market hard-wires to a dedicated circuit run from the consumer unit, which is notifiable work under Approved Document P and adds £300 to £800 on top of the cabin. Infrared cabins plug into a normal 13A socket.

For a flat, a rental, or any home where a new circuit is awkward, that single fact settles it. It is also why the plug-in cabins we rank as the best infrared saunas are the default recommendation for anyone who wants a sauna this month rather than after a rewire.

Running cost favours infrared by about four times

A 1600W infrared cabin costs about 42p a session against about £1.57 for a 6kW traditional cabin, using the Ofgem cap rate of 26.11p per kWh. Three sessions a week is £66 a year against £245, and the way those numbers are built is set out in our breakdown of what a sauna costs to run.

What the research actually supports

Most of the well-known evidence is about traditional Finnish saunas, not infrared, and none of it is about steam rooms, which is a separate comparison covered in dry heat against saturated air. The largest body of work comes from Finland, where a 2015 cohort study published in JAMA Internal Medicine followed 2,315 middle-aged men for over 20 years and found frequent sauna bathing associated with lower cardiovascular mortality.

That is an association in an observational study of Finnish men who use hot traditional saunas several times a week, and it does not transfer automatically to a 60°C infrared cabin. Infrared has a smaller evidence base. Buy either one because you want the heat, and treat the health literature as a reason to be unworried rather than a reason to buy.

Which one suits which household

Buy traditional if

• You want real heat, 80°C and above, and steam off the stones
• You have the space and budget for a dedicated circuit
• The sauna is a weekend event shared with other people
• You are building outdoors, where a garden cabin can be bigger than any indoor room allows

Buy infrared if

• You want to use it most evenings without thinking about the bill
• You cannot run a new circuit, or you rent
• You want it delivered and working this week
• You find 90°C unpleasant, which plenty of people genuinely do

The compromise options

Two products sit between the categories. A combi heater in a traditional cabin adds a water reservoir so the same room can run as a dry sauna or a softer steam room, which suits households that disagree about heat. At the other end, an infrared blanket gives you radiant heat with no cabin at all for about £399, which is the only real option in a flat with no floor space. Both are worth weighing before the fuel and format are locked in, which is the sequence choosing a home sauna runs through.

If the answer is that you want both the heat and the garden, that is a traditional cabin outdoors, and the shortlist worth starting from is our ranking of the best outdoor saunas.