By the SaunaKitsUK.co.uk — The UK's Home Sauna Buying Guide Team · Updated May 2026 · Independent, reader-supported

Traditional Finnish Sauna Kit vs Infrared Sauna Kit UK: Which Is Better for You?

If you're considering installing a home sauna in the UK, you've likely stumbled upon two main options: traditional Finnish (wet) saunas and infrared (dry) saunas. Both have their merits, and choosing between them depends on your space, budget, and what you actually want from a sauna experience. Let's break down the real differences.

How They Work

Traditional Finnish saunas heat the air itself—usually to 70–100°C—using a stove or heating element. You throw water on hot rocks to create steam (called löyly), which raises humidity to 10–20%. This intense heat makes you sweat profusely and is the classic sauna experience most people imagine.

Infrared saunas, by contrast, use infrared heaters (typically far-infrared or a blend of near-, mid-, and far-infrared) to warm your body directly, without significantly heating the air. Temperatures typically run 40–65°C, and humidity stays low (less than 10%), making it feel gentler and less claustrophobic.

Running Costs

This is where the differences matter most for UK households.

Traditional Finnish saunas consume substantially more energy. A typical 3–4 person kit draws 4–6 kW and needs 20–30 minutes to preheat. If you use it twice weekly, expect roughly 30–50p per session in electricity costs (depending on your provider). Over a year, that's £30–50 for regular use.

Infrared kits are far more efficient. Most 2–3 person models draw 1.5–2.5 kW and reach operating temperature in 15–20 minutes. Running costs drop to around 10–15p per session—roughly one-third of a Finnish sauna. For the same twice-weekly use, that's £10–15 annually.

If electricity bills matter to you, infrared wins decisively.

Installation and Space

Traditional saunas need proper ventilation—they produce steam and moisture that must escape. You'll need a vent to the outside, good air circulation, and ideally a drain or waterproof flooring. Installation in a bathroom or basement is possible but requires careful planning. Most kits come flat-packed and take 1–3 days to assemble properly.

Infrared saunas are plug-and-play. They're typically delivered ready-assembled (or require minimal assembly), need only a standard 13A outlet, and generate no moisture. You can install one in a spare bedroom, garage corner, or garden room without ventilation upgrades. Setup is genuinely 20 minutes for most models.

If you're renting or want something you can move or adjust later, infrared's flexibility is significant.

Health Benefits: Honest Comparison

Both work—but in different ways, and claims need nuance.

Traditional saunas increase heart rate and circulation through intense heat exposure. Regular use may improve cardiovascular function, skin condition, and muscle recovery. The humidity can soothe respiratory systems (helpful in dry UK winters). You do feel genuinely "cleansed" afterwards—it's a proven physiological response. However, sessions feel intense; they're not relaxing in the moment.

Infrared saunas warm your core temperature more gently. Some studies suggest infrared penetrates deeper into tissue, potentially aiding muscle soreness and joint stiffness recovery. They're psychologically less demanding—you can read or meditate comfortably. However, the evidence for infrared-specific benefits is less robust than for traditional saunas, and the experience is less immersive.

Neither provides medical miracles. Both improve circulation and promote relaxation. If you have respiratory issues, traditional sauna humidity is genuinely helpful. If you have arthritis or joint pain, infrared's gentler warmth may feel better. If you want the authentic sauna ritual, traditional wins.

Humidity and Comfort

This divides users sharply.

Traditional saunas feel intense. The steam makes breathing harder initially, and the heat is all-enveloping. For some people, this is the whole point—it's a serious physical challenge. For others (especially first-timers, elderly users, or those with sensitive respiratory systems), it's overwhelming.

Infrared saunas feel more like sitting in a warm room. They're comfortable for 30–45 minutes, suit beginners, and appeal to people who want relaxation rather than a sweat-inducing workout. You won't hit the same cardiovascular load, but you'll be more likely to use it regularly.

Running Costs and Maintenance

Traditional saunas need regular cleaning and occasional maintenance on heater elements. Water and mineral deposits can build up; limescale is common in hard-water UK areas. Budget £100–200 annually for descaling and upkeep.

Infrared saunas need minimal maintenance—mostly just wiping down. Expect almost no annual costs beyond electricity.

Which Should You Choose?

Go traditional if: you want the authentic sauna experience, value the intensity and ritual, have space for ventilation, and don't mind higher running costs. You're probably a sauna enthusiast already, or you're building something to last 15+ years.

Go infrared if: you're budget-conscious (especially on electricity), want a low-maintenance option, prefer comfort over intensity, or are new to saunas. You value flexibility and ease of installation.

There's no objectively "better" option—only the better option for your situation. Traditional saunas are the real deal; infrared saunas are the practical, modern alternative that most UK home-sauna users actually end up buying.