Harvia HUUM Drop Series 4.5kW Sauna Heater Package with UKU Wi Fi - DROP 4.5STU Pkg

Harvia HUUM Drop Series 4.5kW Sauna Heater Package with UKU Wi Fi - DROP 4.5STU Pkg

The HUUM DROP 4.5STU PKG offers everything you need to add a touch of elegance to your sauna space. At its core is the award-winning DROP 4.5kW  designed for areas up to 247 cubic feet. You can choose between the advanced UKU Local digital sauna control or the convenient UKU Wi-Fi control package, allowing you to preheat your sauna remotely via your mobile device. This heater features an impressive 122 lbs of rounded olivine stones, delivering consistent soft heat and superior steam. Inspired by the purest element in nature—a drop of water—its rounded design complements the angular interior of a classic sauna, merging aesthetics with functionality. The HUUM DROP not only boasts striking design, having won the prestigious Red Dot Award, but it also excels in engineering, with a large rock capacity that enhances your sauna experience. The ability to ladle more water onto the stones creates an intense and consistent bathing experience, making it the perfect choice for those seeking the ultimate sauna heater.

What our Experts Think

• Complete smart sauna package – The HUUM DROP 4.5kW (DROP 4.5STU Pkg, 4745090017892) includes the heater, UKU WiFi control system, and sauna stones, making it a ready-to-install premium setup.
• Ideal for compact sauna rooms – Designed for small spaces (~3–7 m³ / 106–248 cu. ft.), offering efficient heating without overpowering the cabin.
• Iconic award-winning design – The signature water-drop shape adds a luxury, sculptural aesthetic while saving wall space in modern sauna builds.
• Excellent steam quality (löyly) – High stone capacity (~120+ lbs) produces soft, long-lasting steam instead of harsh dry heat, improving comfort and relaxation.
• Smart WiFi control advantage – UKU WiFi allows remote start, scheduling, and precise temperature control via mobile app, improving convenience and usability.
• Comfort-focused heating behavior – Experts note it delivers steady, gradual heat with strong thermal stability, ideal for longer, more relaxing sauna sessions.
• Premium build quality – Stainless steel construction and engineered heating elements ensure durability and consistent performance in high-heat environments.

Q&A

Maintenance Tips 

• Clean exterior regularly with a soft dry or damp cloth to keep finish clean and dust-free.
• Inspect sauna stones every 2–3 months and replace any cracked or crumbling stones for safe performance.
• Restack stones properly to maintain airflow and protect heating elements from overheating.
• Check heating elements periodically for wear, discoloration, or uneven heating.
• Keep ventilation openings clear to ensure stable airflow and efficient heat circulation.
• Avoid excessive water pouring directly onto the heater to prevent element stress.
• Wipe interior surfaces after cooling to reduce moisture and mineral buildup.
• Inspect UKU WiFi control system annually for calibration and safe electrical operation.