Ask ten people to describe a sauna and a steam room and you will hear the same answer: a hot little room you sit in to sweat. But the two are genuinely different experiences, they suit different homes, and they carry very different price tags once you look past the door.
If you are weighing up which one to bring home, this guide compares them properly: how each one feels, what the heat actually does, what they cost to buy and run, and which is the more practical fit for a UK house or garden.
What is a sauna?
A sauna is a wood lined room that uses dry heat. In a traditional sauna, a stove heats a bed of stones and the room sits at around 70 to 90 degrees with low humidity, usually somewhere between 10 and 20 percent. Ladle water over the stones and you get a brief, satisfying wave of steam the Finns call loyly, but the air stays fundamentally dry.
An infrared sauna works differently again. Instead of heating the air, infrared emitters warm your body directly at a much gentler 45 to 65 degrees, which many people find easier to sit in for longer.
What is a steam room?
A steam room is a sealed, tiled or glass room fed by a steam generator. The temperature is much lower, typically 40 to 45 degrees, but the humidity is total: the air holds as much moisture as it physically can, which is why you cannot see across a good steam room and why the heat feels so heavy on your skin.
Because everything inside is permanently wet, a steam room has to be built like a wet room: fully waterproofed, tiled or moulded, with plumbing for the generator and proper drainage. That single fact drives most of the practical differences below.
The key difference: dry heat vs wet heat
Everything else flows from one distinction. A sauna is hot and dry, so your sweat evaporates and the heat feels sharp, clean and intense. A steam room is warm and saturated, so sweat cannot evaporate and the heat feels enveloping and heavy.
- Temperature: sauna 70 to 90 degrees (infrared 45 to 65), steam room 40 to 45 degrees
- Humidity: sauna 10 to 20 percent, steam room 100 percent
- The feel: a sauna is crisp, dry heat you can breathe easily in; a steam room is thick, wet warmth that clings
- The room: a sauna is warm timber; a steam room is wet tile and glass
Neither is objectively better. Plenty of spas offer both side by side precisely because people love one and merely tolerate the other. If you have never spent time in each, a session at a gym or spa that has both is the cheapest research you will ever do.
Which is better for recovery and wellbeing?
Both raise your core temperature, get you sweating and leave you deeply relaxed, and both are used for muscle recovery after exercise. The differences are at the margins.
Saunas have the deeper evidence base. Most of the long term research on heat bathing, including the well known Finnish studies on cardiovascular health, was done in traditional dry saunas. If the documented benefits of regular sauna use are what draws you to heat bathing, the sauna is the one the science actually describes.
Steam rooms have one clear point of difference: moist air. If you regularly feel congested, the humid warmth of a steam room can feel wonderful in a way dry heat does not, and many people simply prefer wet heat on their skin.
For sleep, stress and general unwinding, honest answer: the best one is whichever you will actually use three times a week.
Sauna vs steam room: cost
Here the two options separate quickly, because they are built in completely different ways.
Cost to buy and install
A home sauna is a self contained timber room. It arrives as a cabin, sits on a level base indoors or in the garden, and needs an electrical supply but no plumbing. In the UK most people spend between £3,000 and £9,000 all in, and our own range runs from £2,999 to £8,399 with the entry level heater included. We have broken the whole market down, tier by tier, in our guide to how much a home sauna costs.
A steam room is a construction project. Because it must be fully waterproofed, tiled and plumbed, most domestic steam rooms are custom built into a bathroom or basement, and realistic budgets start around £5,000 and climb well past £10,000 once tiling, glazing and the generator are in. Prefabricated steam shower cabins exist from roughly £1,000 to £3,000, but they are a shower with a steam function rather than a true steam room.
Cost to run
Running costs are closer than most people expect. A 6kW sauna heater used for an hour costs around £1.57 at current electricity prices, and an infrared sauna as little as 39p a session. A domestic steam generator draws a similar 3 to 9kW while it runs, so a session lands in the same range. The bigger long term cost difference is maintenance, not electricity: we cover the sauna side in full in how much it costs to run a sauna.
Maintenance and lifespan
A sauna is a dry environment, and dry timber rooms age slowly. Wipe the benches down, air it after use, oil the wood occasionally and a well built sauna should last decades. Ours are lined in thermally modified aspen, which resists moisture and movement better than untreated softwood.
A steam room is a permanently wet environment, and wet rooms fight a constant battle with mould, limescale and grout. It needs regular deep cleaning, the generator needs descaling and servicing, and seals and silicone need renewing over the years. None of this is a reason not to have one, but it is a real difference in how much ongoing attention each room demands.
Which should you choose?
A few honest rules of thumb:
- You want it in the garden: sauna. Outdoor steam rooms are vanishingly rare in the UK for good reason; outdoor saunas are a whole category, built to live outside all year.
- You want the option without building work: sauna. A cabin arrives, sits on its base and plugs into a dedicated supply. No tiling, no plumbing, no waterproofing.
- You are already renovating a bathroom: this is the moment a steam room makes most sense, while the waterproofing and plumbing are open anyway.
- You want the researched health habit: sauna, because that is where the long term evidence sits.
- You love wet heat and know it: steam room, and no listicle should talk you out of it.
Try the real thing before you decide
Comparisons on a page only get you so far. Heat is personal, and twenty minutes in each tells you more than twenty articles.
If the dry heat side wins you over, you can sit in a real Hekla sauna at a showroom near you and see the difference cabin quality makes. Find your nearest Hekla stockist, or start with our sauna buying guide and browse the full sauna range.