Harvia HUUM Series Sauna Heater Package with UKU Wi Fi - DROP 9STU Pkg

Harvia HUUM Series  Sauna Heater Package with UKU Wi Fi - DROP 9STU Pkg

The HUUM DROP 9STU PKG includes everything you need to add a touch of elegance to your sauna space. At its core is the award-winning DROP 9.0 kW  designed for spaces up to 530 cubic feet (CF). You can choose between the advanced UKU Local digital sauna control or the added convenience of the UKU Wi-Fi control package, which allows you to preheat your sauna from anywhere using your mobile device. Inspired by the purest element in nature—a drop of water—its rounded design complements the angular interior of a classic sauna. This compact, wall-mounted heater accommodates up to 122 lbs of stones, ensuring long-lasting steam and a consistently soft, high heat. A winner of the prestigious Red Dot Award for design, the combines beauty with engineering excellence, allowing bathers to ladle more water onto the stones for an intensified experience. Enjoy the luxury of Wi-Fi control for ultimate convenience in your sauna routine.

What our Experts Think

• Premium all-in-one sauna package
  The HUUM DROP 9STU Pkg with UKU WiFi combines the iconic DROP 9kW heater, smart controller, and sauna stones—offering a complete, ready-to-install premium system.
• Designed for larger home saunas
  Optimized for rooms up to ~530 cu. ft., making it a strong fit for medium–large residential or outdoor sauna builds needing consistent high output.
• Exceptional steam quality (high stone mass)
  Holds up to ~122 lbs of sauna stones, producing soft, long-lasting heat and rich löyly bursts—a key reason this model is favored for spa-like experiences.
• Smart WiFi control (UKU system)
  Includes UKU WiFi compatibility, enabling remote preheating, scheduling, and precise temperature control via mobile app for modern convenience.
• Iconic award-winning design
  The water-drop shape is both functional and aesthetic, designed to blend into modern sauna interiors while maximizing stone exposure for better heat retention.
• Stainless steel durability & wall-mounted efficiency
  Built with industrial-grade stainless steel and wall-mounted construction, saving floor space while maintaining strong thermal performance

Q&A

Maintenance Tips

• Re-stack sauna stones (every 6–12 months): Keep stones loosely packed around heating elements to ensure proper airflow and prevent element damage (critical for Drop design).
• Replace cracked or crumbling stones: Damaged stones reduce heat efficiency and can stress heating elements over time.
• Use clean water only: Avoid oils, fragrances, salt, or chemicals to prevent residue buildup on stones and elements.
• Check stone distribution regularly: Ensure stones are not pressing directly on heating elements—maintains even heat and extends lifespan.
• Clean stainless steel surfaces: Wipe exterior and inner exposed areas to prevent moisture stains and corrosion.
• Inspect heating elements periodically: Look for warping or dust buildup; ensure no stone pressure is affecting coils.
• Maintain ventilation & airflow: Proper sauna ventilation improves heater efficiency and supports stable UKU-controlled heating cycles.
• Keep UKU WiFi control system updated & dry: Ensure sensor and door switch connections remain secure for accurate temperature control