Air Mixing Technology- Saunum's patented air blending system mixes cold, oxygen-rich air from the floor with hot, oxygen-poor air from the ceiling. This eliminates discomfort commonly associated with sauna use, delivering heat and oxygen evenly from head to toe-whether you prefer high or moderate temperatures. European Design- Features a refined stainless steel finish, blending Scandinavian design with premium materials. Massive Stone Capacity- With a large 132-pound stone capacity (4 boxes required, sold separately), the heater ensures softer, more consistent heat and indulgent steam, true to Nordic sauna tradition. Himalayan Salt Reservoir- Integrated salt spheres are positioned within the air stream, dispersing health-promoting salt ions throughout the sauna. Designed for sauna rooms from177 to 282 cu. ft. UL-listedfor safety and reliability.