Usage Guide
What Is Löyly? A Guide to Sauna Steam
An expert guide to löyly — the Finnish concept of sauna steam — including how to create the perfect löyly, the role of heater stones, and why stone quality matters.
By Wellness One Lifestyle · Published 2026-08-02 · Updated 2026-08-02
Löyly: The Heart of the Finnish Sauna
Löyly (pronounced 'loy-loo') is the Finnish word for the steam created when water is poured on sauna heater stones. In Finnish culture, löyly is not just steam — it is the spirit of the sauna. The quality of the löyly is the measure of a sauna's quality.
How Löyly Works
When water is poured on hot stones (typically 300–500°C), it instantly vaporises into steam. This steam raises the perceived temperature of the sauna significantly — even though the actual air temperature may not change much, the humidity increases the rate of heat transfer to the body.
Good löyly is soft, enveloping, and long-lasting. Poor löyly is sharp, harsh, and dissipates quickly.
What Makes Good Löyly?
Stone temperature: The stones must be fully heated before adding water. A Huum or Harvia heater takes 30–45 minutes to heat the stones to the optimal temperature.
Stone quality: Large, dense volcanic stones (such as olivine diabase) retain heat best and produce the softest löyly. Wellness One saunas come with quality heater stones as standard.
Stone quantity: More stones means more heat capacity and better löyly. Huum heaters are particularly well-regarded for their large stone capacity.
Water quantity: A small ladle of water at a time produces the best löyly. Too much water at once produces harsh steam and can damage the heater.
Water quality: Some sauna enthusiasts add a small amount of birch extract, eucalyptus oil, or other sauna essences to the water for an aromatic löyly.
The Löyly Ritual
In the Finnish tradition, the löyly is a social ritual. The person nearest the heater — typically on the top bench — pours the water and is responsible for the quality of the löyly. The correct amount is debated with great seriousness.
Frequently Asked Questions
What is löyly?
Löyly (pronounced 'loy-loo') is the Finnish word for the steam created when water is poured on sauna heater stones. It is central to the Finnish sauna tradition and significantly enhances the perceived heat and the sauna experience.
How do you create good löyly?
Good löyly requires hot stones (the heater should be fully heated before adding water), the right amount of water (a small ladle at a time), and quality stones (large, dense volcanic stones retain heat best). Wellness One saunas come with Huum or Harvia heaters, both of which are designed for excellent löyly.