To enhance the design and create a more soothing steam experience in your HUUM heater, we suggest using rounded stones. Each box includes three different sizes of rounded olivine diabase stones: 3-5 cm, 5-10 cm, and 10-15 cm. This is done to ensure optimal stone spacing within the heater. These stones are durable and have a high heat capacity. While you can use other types of stones in HUUM heaters, we do not recommend using decorative stones as they may break easily.
 
When regulating the heat and steam in your sauna, you can do so by throwing water on the stones. The shape, size, and composition of the stones, as well as how they are arranged, can greatly impact the sauna experience. Rounded stones provide a gentler steam because their shape allows the water to reach inner layers and evaporate gradually rather than all at once from the top layer. To create a cohesive look, be sure to use a mix of smaller and larger stones in your HUUM heater. You can also layer smaller stones closely together on the top for better heat accumulation. Choose your stones wisely for the best sauna experience.