Harvia Onni Sienna Duo infrared sauna

Onni Sienna Duo combines natural materials with responsive infrared technology. The warmth is available quickly, without the need to heat the entire cabin volume in advance. Each seating position is supported by a full-spectrum radiator behind the back and carbon panels at the sides and lower body. This ensures steady and even infrared warmth that feels controlled and comfortable. The mahogany exterior presents a warm, natural finish that feels both timeless and inviting. Inside, mahogany combined with hemlock adds depth and harmony, while the glass front keeps the overall look open and composed. Temperature and lighting are adjusted via a large touch screen. Chromotherapy lighting and integrated Bluetooth audio support a personalized session. The structured construction enables installation within a few hours and provides reliable infrared comfort over years of use. Onni Sienna Duo brings infrared wellbeing into everyday life — warm in expression, steady in performance, and built for lasting use.