One of the most frequently asked questions by people planning to buy an outdoor sauna is how much electricity it will consume during daily use. This is completely understandable. After all, a sauna is meant to last for many years, and no one wants to be surprised by high energy bills.
The good news is that in practice, the costs are usually lower than many people expect.
What determines electricity consumption in a sauna?
There isn't one answer, as each sauna operates under slightly different conditions. Not only the heater's power matters, but also the size of the cabin, the quality of craftsmanship, the material it's built from, the outside temperature, and the way it's used.
Modern outdoor saunas made from high-quality thermo-wood retain heat very well. This means the heater doesn't operate at full power all the time. Once the set temperature is reached, the thermostat automatically limits its operation and activates the heating elements only when needed.
This is precisely why actual energy consumption is much lower than what might be suggested by the device's power alone.
How much power does a sauna heater consume?
The most common electric heaters have a power output of 6 to 9 kW.
For example:
- a 6 kW heater consumes a maximum of 6 kWh of energy per hour of continuous operation,
- an 8 kW heater consumes a maximum of 8 kWh,
- a 9 kW heater consumes a maximum of 9 kWh.
In practice, however, this situation only occurs during sauna heating. When the interior reaches a temperature of about 80–90°C, the heater starts to operate cyclically. It switches on only for a moment to replenish lost heat.
Therefore, during a typical session, energy consumption is significantly lower.
How much does one sauna session cost?
Let's assume you're using a sauna equipped with an 8 kW heater.
The first 40–60 minutes are for heating. During this time, the heater operates almost at full power. Afterwards, it maintains the temperature much more economically.
For a two-hour session, the total energy consumption is typically around 10–12 kWh.
At an energy price of approximately 1 PLN per 1 kWh, this means a cost of about 10–12 PLN per sauna use.
If four people use the sauna, the cost per person is about 2.50–3 PLN.
That's less than a cup of coffee in most cafes.
Does a larger sauna always consume more electricity?
Not necessarily.
Many customers assume that a larger sauna means significantly higher bills. In practice, the differences often turn out to be small.
Insulation, airtightness of the structure, wood quality, and a properly selected heater play a significant role. A well-designed sauna for six people can be more energy-efficient than a small cabin made of lower-quality materials.
Therefore, when choosing a sauna, it's worth looking at the entire construction, not just the heater's power.
Does the outside temperature matter?
Yes, but not as much as it might seem.
In summer, the sauna heats up faster because the wood has a higher initial temperature.
In winter, when it's freezing outside, heating may take several minutes longer, and the heater will consume a bit more energy. However, a well-made sauna from thermo-pine or other heat-treated wood very effectively reduces heat loss.
This is why modern outdoor saunas are designed for year-round use.
How to reduce energy consumption?
The simplest way is to use the sauna properly.
It's not advisable to open the door unnecessarily during heating. Each opening causes hot air to escape, and the heater must raise the temperature again.
Regular maintenance, clean stones, and an efficient heater also contribute to effective operation.
If you plan to use the sauna several times a week, it's worth choosing models made of thermo-wood. Better insulation means less energy loss throughout the entire period of use.
Is an electric sauna expensive to maintain?
From experience, we can say one thing. Most people are positively surprised by the actual operating costs after purchasing a sauna.
Concerns about very high electricity bills usually turn out to be unnecessary. In return, users gain the ability to use their own sauna at any time of day, without having to travel to a SPA or wellness area.
If you choose a properly matched heater and a well-made sauna, the cost of a single session will be relatively small, and comfort will remain at the highest level.
At Saunado, we help choose not only the right sauna model but also a heater of appropriate power. This ensures the sauna heats up efficiently, operates economically, and provides comfort for many years.