Original IKI sauna stove is the classic model by IKI-Kiuas. All other IKI stove designs are based on this one. The Original IKI stove is suitable for a 14–30 cubic metre sized sauna room.

The stove can take in 570 lb of stones, which guarantee a fully satisfying heat even to the most enthusiastic sauna-goers. However, for those who enjoy a more subtle heat, the sides of the stove give out a gentle and humid steam.

The quick heating time of approximately 1 hour is made possible by the 1 m2 contact area between the furnace and the stones. When heated the heavy-duty spiral fire pipe burns red transmitting heat quickly to the stones.