HUUM HIVE 18 kW Electric Sauna Heater – Extreme Performance for Very Large Saunas

The HUUM HIVE 18 kW Electric Sauna Heater is the powerhouse of the HIVE line, purpose-built for expansive residential or commercial sauna rooms from 636 to 989 cubic feet (18 – 28 m³). Its enormous 551-pound (250 kg) stone capacity delivers deep, even, long-lasting löyly that feels just like a traditional wood-burning sauna—only without the firewood. The iconic beehive silhouette, crafted entirely from brushed stainless steel, turns this heater into a functional centre‑piece that looks as good as it performs.

Precision-Engineered in Estonia

Every HIVE heater is hand‑finished in HUUM’s Estonian factory, where award‑winning Scandinavian design meets rigorous engineering. Each unit is laser‑cut from thick, corrosion‑resistant stainless steel and inspected multiple times before it leaves the workshop to guarantee decades of reliable service.

Steam Quality That Rivals a Wood Stove

By minimizing visible metal and maximising stones, the HIVE 18 radiates heat primarily from its rocks. This produces softer infrared wavelengths, higher negative‑ion levels, and wonderfully gentle steam that envelopes bathers without harsh temperature spikes. The 250 kg stone mass stores heat for hours, so you can keep the session going even after the elements cycle off.

Key Features & Benefits

• Stainless‑Steel Construction: Industrial‑grade, rust‑proof body for commercial durability
• Massive 551 lb Stone Capacity: Soft, stable heat and extended steam bursts
• 18 kW Output: Sized for the largest homes, spas, gyms, and wellness centres
• 240 V / 1‑Phase, 75 A: North‑American compatible; requires UKU extension box over 9 kW
• Industrial Heating Elements: Built to withstand heavy daily use
• Floor‑Mounted with Adjustable Legs: Simple levelling on any surface (+7 cm height adjustment)
• More Exposed Stones: Longer‑lasting, milder heat—no scorching metal surfaces
• SGS Safety‑Certified: Independently tested for safe, efficient operation
• Wi‑Fi Ready: Works with UKU Wi‑Fi or UKU Glass controls for remote start/stop & scheduling
• Limited 5‑Year Warranty: Peace of mind for years of sauna enjoyment

What’s Included

• HUUM HIVE 18 kW Electric Sauna Heater
• Adjustable Stainless Legs (+7 cm)
• Integrated Air Tunnel (speeds warm‑up & extends element life)

Additional Requirements (Sold Separately)

• UKU Control Unit (mandatory)
• HUUM Sauna Stones, 551 lb / 250 kg (17 boxes 5–10 cm)
• UKU Extension Box (required for heaters > 9 kW)
• Optional Flange H for embedding into benches

Technical Specifications

• Sauna Volume: 636 – 989 ft³ (18 – 28 m³)
• Stone Capacity: 551 lb (250 kg)
• Heater Weight: 53 lb (24 kg)
• Dimensions (Ø × H): 22 in × 29.5 in (560 mm × 750 mm)
• Electrical: 18 kW, 240 V 1‑phase, 75 A, 2 × 50 A breakers, AWG 6 + 6 wire
• Safety Distance – Side (A): 180 mm (7 in)
• Safety Distance – Ceiling (B): 920 mm (36 in)

Why Choose the HUUM HIVE 18 kW?

If you operate a large commercial spa or simply love hosting big sauna nights at home, the HUUM HIVE 18 kW offers unmatched thermal mass, refined Nordic aesthetics, and modern smart‑control convenience. Upgrade today and experience the ultimate blend of luxury, performance, and reliability in one exquisite heater.

Note: HUUM’s largest electric HIVE model is officially rated at 18 kW. A 19 kW variant is not currently produced; the 18 kW version described above is the top‑of‑line specification.