How Much Does a Sauna Cost to Run at Home UK?

Installing a sauna at home is becoming more popular across the UK, especially with more homeowners looking for ways to relax, recover and create a private wellness space without relying on gyms, spas or hotel facilities. But before investing in one, one of the biggest questions is simple: how much does it cost to run a sauna at home?

The good news is that most home saunas are more affordable to run than many people expect, especially when you understand how electricity usage works. The exact cost depends on the type of sauna, the heater size, how long each session lasts, how often you use it and how well the sauna holds heat.

In this guide, we’ll break down typical home sauna running costs in the UK, compare traditional and infrared models, and show practical examples so you can estimate what a sauna may add to your electricity bill.

How Is Sauna Running Cost Calculated?

The main ongoing cost of running an electric home sauna is electricity. Every sauna heater or infrared panel has a power rating measured in kilowatts, usually shown as kW.

To estimate your sauna’s running cost, use this simple formula:

Power rating x session length x electricity rate = estimated running cost

For example, if a sauna uses a 3kW heater and runs for 30 minutes, the calculation would be:

3kW x 0.5 hours x £0.2467 = around £0.37 per session

That figure is based on the current average UK electricity unit rate of 24.67p per kWh for customers paying by Direct Debit under the Ofgem price cap period from 1 April to 30 June 2026. Your actual tariff may be higher or lower, so it is always worth checking your own electricity bill for the most accurate figure.

Are Saunas Expensive to Run?

For most households, a home sauna is not extremely expensive to run when used sensibly. A small infrared sauna may cost only a few pence per short session, while a larger traditional sauna with a more powerful heater will naturally cost more.

Here are some rough examples using an electricity rate of 24.67p per kWh:

These are estimates based on heater rating and session length. In reality, a sauna may not draw full power constantly once it reaches temperature, but warm-up time, insulation, outdoor temperature and usage habits can all affect the final cost.

Traditional Sauna vs Infrared Sauna Running Cost

One of the biggest differences in sauna energy costs UK homeowners should understand is the difference between traditional and infrared heating.

A traditional electric sauna heats the air inside the cabin. This usually means higher temperatures, often around 70°C to 100°C, and more energy used during the warm-up phase. Larger traditional saunas also need more powerful heaters because there is more air and timber to heat.

An infrared sauna works differently. Instead of heating the air first, infrared panels warm the body more directly. These saunas often operate at lower temperatures, commonly around 45°C to 65°C, and usually use lower wattage than a traditional sauna of a similar size.

That means the infrared sauna running cost is usually lower, especially for regular short sessions. However, the best option depends on what kind of sauna experience you prefer. Traditional saunas offer a hotter, classic sauna feel, while infrared saunas are often chosen for gentler heat, quicker warm-up and lower energy use.

You can compare different styles in the CenturaHeat sauna collection, including compact indoor models, infrared options and larger traditional saunas.

What Affects the Cost to Run a Sauna?

Several factors influence the final cost of running a sauna at home.

The first is heater size. A 2kW infrared sauna will cost less to run than a 6kW traditional model if both are used for the same amount of time.

The second is session length. A 20-minute session will use less electricity than a 45-minute session, especially if the sauna is left running before or after use.

The third is frequency of use. Using a sauna once or twice a week will have a much smaller effect on your electricity bill than daily use.

The fourth is insulation and build quality. A well-built sauna with a properly fitted door and quality timber will retain heat better, helping reduce wasted energy.

Finally, where the sauna is installed can make a difference. An outdoor sauna used in colder weather may need more energy to warm up than an indoor sauna placed in a stable room temperature environment.

Example Monthly Sauna Running Costs

Let’s look at a realistic monthly example.

A 3kW home sauna used for 30 minutes, three times per week, would cost around:

3kW x 0.5 hours x £0.2467 = £0.37 per session

Used three times per week:

£0.37 x 3 = £1.11 per week

Over four weeks:

£1.11 x 4 = £4.44 per month

A larger 6kW sauna used in the same way would cost roughly double:

6kW x 0.5 hours x £0.2467 = £0.74 per session

Three sessions per week would be around:

£2.22 per week, or around £8.88 per month

These examples show why sauna running costs are usually manageable, especially when sessions are planned and the sauna is switched off promptly after use.

How to Reduce Home Sauna Running Costs

There are a few simple ways to keep your sauna electricity usage under control.

Choose the right size for your household. A large 6 to 8 person sauna may be ideal for families or entertaining, but if only one or two people will usually use it, a smaller model may be more efficient.

Avoid leaving the sauna on unnecessarily. Preheat it only for as long as needed, enjoy your session, then switch it off once finished.

Keep the door closed during use. Opening the door repeatedly lets heat escape and makes the heater work harder.

Look for a sauna with good construction and a suitable heater size. A sauna that is properly matched to its heating system should warm efficiently without unnecessary energy waste.

Consider infrared if low running cost is a priority. While traditional saunas deliver the classic high-heat experience, infrared models are often more economical for frequent home use.

For more advice and product options, you can explore the full CenturaHeat website here: CenturaHeat.

Is a Home Sauna Worth the Running Cost?

For many UK homeowners, the answer is yes. When compared with regular spa visits, gym memberships or wellness treatments, the cost of running a home sauna can be relatively modest. The bigger investment is usually the initial purchase, not the day-to-day electricity use.

A home sauna also gives you convenience. You can use it in the evening, after training, during colder months or whenever you want to unwind without travelling anywhere.

The key is choosing a sauna that suits your space, budget and usage habits. If you want lower running costs, infrared may be the better fit. If you want a more traditional, high-temperature sauna experience, a steam-style or traditional electric sauna may be worth the slightly higher energy use.

Final Thoughts

So, how much does it cost to run a sauna in the UK? In many cases, a typical home sauna session may cost anywhere from around 20p to just over £1, depending on the model, power rating and session length.

Smaller infrared saunas usually have the lowest running costs, while larger traditional saunas cost more because they use more powerful heaters. Even then, regular weekly use can often remain surprisingly affordable when managed properly.

At CenturaHeat, we offer a wide range of home sauna options to suit different spaces, lifestyles and budgets. Whether you are looking for a compact infrared sauna, a traditional indoor sauna or a larger model for shared use, you can browse our full range here: CenturaHeat Saunas.