How to Use a Sauna With Rocks

What is a Sauna With Rocks?

If you’ve ever stepped into a sauna and noticed a heater covered with dark stones, you might wonder: why are there rocks in here? You are right, they’re definitely not decoration. Those rocks are what make a traditional Finnish sauna work.

In a Finnish sauna, the heater (which can be wood-burning or electric) is filled with special stones. These aren’t regular rocks but tough stones that can handle extreme heat without breaking. The heater warms the stones until they’re blazing hot.

When to go in?

The sauna is usually ready to use from the temperate of around 60°C (140°F) when the rocks are hot enough to vaporize the water instantly without cooling down the heater. Many people find 60–80°C (140–176°F) the optimal range to go in. Going hotter, around 80–100°C (176–212°F), is also common, but expect the heat to feel much stronger.

Pouring Water on the Rocks

Here’s where things get enjoyable: when you pour a little scoop of water onto the hot rocks, the water instantly turns into steam. In Finnish, this steam is called löyly.

That burst of steam makes the sauna feel more intense:

• The air gets more humid.

• The heat feels stronger and deeper.

• You start to sweat more.

If you want it hotter, add more water. If you want it milder, just let the rocks glow on their own.

Taking Breaks

The sauna with rocks can turn intense. Don't stay in too long at once. Step out to cool down—take a shower, dip in cold water, or just sit and relax. After a short break, you can go back in for another round. Many people enjoy a few rounds of heating and cooling. Always listen to your body.

For more guidance and tips on tolerating the heat comfortably, see my digital sauna guide!