Olivine diabase sauna heater stones are the most common and used sauna stones for all heater types and is a subvolcanic rock mined in Western Finland. This traditional stone type is durable in structure and thanks to its high density, it stores and releases heat well. This guarantees perfect steam for sauna.

Split-face stones are recommended for both wood-burning and electric sauna stoves, as they store more heat. When water is thrown onto the stones it will evaporate efficiently on the broader stone surface. Harvia stones stack easily and allow better air circulation, which improves the durability of the heating elements. These stones provide bathers with an intense, yet soft heat.