By the SaunaSpot UK — The Home Sauna Authority Team · Updated May 2026 · Independent, reader-supported

Home Sauna Running Costs UK — How Much Does It Cost Per Session?

Most people assume running a home sauna is expensive. It doesn't have to be. The actual cost depends on your heater type, how often you use it, and current electricity rates—and there's a significant gap between infrared and traditional saunas that's worth understanding before you buy.

Why sauna running costs matter

A sauna is a long-term investment. You might spend £800 to £3,000 installing one, but the real cost is what it takes to run every week. If electricity eats up £20 to £40 monthly, that matters over five years. If you're choosing between heater types—infrared versus traditional steam—the running cost difference can easily justify picking one over the other.

Current UK electricity rates hover around 27–32p per kilowatt-hour, depending on your supplier and contract. That's your baseline for any calculation.

How sauna heaters consume electricity

A home sauna heater doesn't run continuously. It heats up to your target temperature, then cycles on and off to maintain it. A 30-minute session doesn't mean 30 minutes of heating at full power.

Infrared heaters typically draw 1.5 to 2.5 kW and take 10 to 20 minutes to reach comfortable temperature (around 50–60°C). Once there, they use less energy cycling on and off.

Traditional saunas need larger heaters—usually 4 to 8 kW—because they heat the air and rocks to 70–100°C. They take longer to reach temperature and consume more power overall.

The difference is real: infrared heaters are fundamentally more efficient at delivering warmth directly to your body rather than heating a large volume of air.

Infrared vs traditional sauna costs

Let's calculate realistic scenarios using a 27p per kWh rate (a mid-range UK price).

Infrared sauna session:

• Heater size: 2 kW
• Preheat time: 15 minutes (0.5 kWh)
• Session time: 30 minutes at half power (0.5 kWh)
• Total per session: ~1 kWh
• Cost per session: 27p

Monthly use (twice weekly, 8 sessions): £2.16

Traditional sauna session:

• Heater size: 6 kW
• Preheat time: 25 minutes (2.5 kWh)
• Session time: 30 minutes at full power (3 kWh)
• Total per session: ~5.5 kWh
• Cost per session: £1.49

Monthly use (twice weekly, 8 sessions): £11.92

The gap widens with heavier use. If you're a daily user (365 sessions), infrared costs roughly £98 annually; traditional costs around £544.

Real-world range: Most home sauna users report monthly costs between £2 and £15, depending on heater type and frequency. Infrared clusters at the lower end; traditional clusters at the higher end.

Monthly cost scenarios

Here's what you'd actually spend across different use patterns:

Light use (once weekly):

• Infrared: 54p/month
• Traditional: £2.97/month

Moderate use (twice weekly):

• Infrared: £2.16/month
• Traditional: £11.92/month

Regular use (four times weekly):

• Infrared: £4.32/month
• Traditional: £23.84/month

Daily use:

• Infrared: £8.10/month
• Traditional: £48.70/month

These figures assume stable electricity rates. If rates rise to 35p per kWh (which many suppliers now charge), multiply all figures by 1.3.

For most households, moderate use makes sense. It gives health benefits without aggressive running costs. That twice-weekly pattern—infrared at roughly £25 annually, or a few quid a month—is negligible.

Ways to reduce running costs further

Use infrared, not traditional. This is the single biggest lever. A 2 kW infrared heater versus a 6 kW traditional heater is almost a 3× difference in power draw.

Insulate properly. A poorly insulated sauna cabin loses heat rapidly, forcing the heater to work harder. If your cabin is indoors or in a shed, ensure walls and ceiling have adequate insulation. Outdoor cabins suffer more.

Use a timer. Set your sauna to preheat 15 minutes before you enter. Don't leave it running all day or overnight. Many heaters have built-in timers; use them.

Run at lower temperatures. Infrared saunas are comfortable at 45–55°C. Traditional saunas typically need 75–85°C. Lower temperature = less energy consumption.

Share usage. If a household has multiple sauna enthusiasts, running it twice weekly for two people is more economical per person than running it once weekly for one.

Monitor your actual consumption. Use a plug-in electricity meter to see real kWh draw over a month. This beats guessing.

What to look for when buying

Running cost should influence your purchase decision. An infrared sauna under £1,000—typically a 2-person cabin with a 2 to 2.5 kW heater—will cost pence per session and under £100 annually at twice-weekly use. Traditional saunas in that price range are rare and usually smaller; costs scale up fast.

If cost matters, infrared is the practical choice. You get genuine heat therapy, lower electricity bills, and no compromise on experience. Most users find the warmth adequate and prefer it to traditional saunas, especially in homes where space is limited.

Running a sauna isn't expensive if you choose the right type and use it sensibly. Twice weekly on infrared is genuinely affordable.