HUUM HIVE 18 (18 kW) Electric Sauna Heater

Optimize your large-scale sauna experience with the HUUM HIVE 18, a high-performance electric heater designed for expansive saunas in residential, spa, or commercial gym settings. Combining modern sculptural design with massive heating power, the HIVE 18 ensures a luxurious, soft steam (Loyly) experience even for larger groups. Its signature beehive-inspired cage exposes a massive volume of stones to the air, providing consistent, long-lasting heat and exceptional thermal mass.

To ensure peak performance, every HIVE heater now includes an internal air tunnel, which speeds up the heating process by 25% and significantly extends the life span of the heating elements.

Unmatched Thermal Mass & Steam

The HUUM HIVE 18 is a freestanding powerhouse that holds a massive 550 lbs (250 kg) of stones. This high stone capacity acts as a thermal battery, radiating heat evenly from all sides and maintaining therapeutic temperatures long after the heater has been adjusted. When water is poured over the rounded stones, the HIVE 18 generates the deep, consistent steam essential for an authentic Estonian or Finnish sauna session.

High-Efficiency Air Tunnel Technology

Crafted from high-grade stainless steel and positioned in the center of the heater, the integrated HIVE Air Tunnel optimizes airflow. By directing air through the core of the stone pile, the sauna reaches target temperatures faster and more efficiently. This technology also reduces the direct stress on the heating elements, ensuring your heater operates reliably for years in high-demand environments.

Durable Stainless Steel Craftsmanship

Each HUUM heater is precision-crafted in Estonia using high-grade stainless steel for maximum durability and corrosion resistance. The sculptural, vertically-oriented cage design is not just a visual statement; it is a functional choice that allows for efficient heat radiation while minimizing the amount of exposed hot metal surfaces.

Professional-Grade Control & Smart Integration

Designed for high-output environments, the HIVE 18 (18 kW) operates on a 240V 1-phase connection (75 Amps). Because of its high power rating, this model requires the HUUM UKU Extension Box in addition to a UKU control system. This professional setup allows for precise temperature management and the ability to preheat your sauna directly from your smartphone via the HUUM mobile app.

Features

• High-Capacity Design: Optimized for large residential or commercial saunas.

• HIVE Air Tunnel Included: Speeds up heating by 25% and protects heating elements.

• Massive Stone Capacity: Holds 550 lbs of stones for unparalleled heat retention and steam.

• Premium Stainless Steel: Durable and rust-resistant Estonian craftsmanship.

• Modern Aesthetic: Sculptural beehive design serves as a stunning centerpiece.

• Freestanding Stability: Robust floor-mounted profile for secure installation.

• Smart Control Ready: Compatible with HUUM UKU local or Wi-Fi controllers (requires Extension Box).

Specifications

• Power Output: 18 kW.

• Sauna Room Size: 636 – 989 cubic feet (18 – 28 m³).

• Stone Capacity: 550 lbs (250 kg).

• Dimensions: 22.05" Diameter x 29.53" Height.

• Electrical: 240V, 1-phase, 75 Amps (50+50 amp breaker, 8+8 AWG wire).

• Weight: Approx. 55 lbs without stones.

• Warranty: Manufacturer's limited warranty included.

Required & Recommended Accessories

• UKU Extension Box: Required for operation of the 18 kW model.

• Rounded Stones: HUUM recommends rounded olivine diabase stones for optimal airflow.

• HIVE Safety Railing: Protects bathers from accidental contact with the heater.

• HIVE Embedded Flange: Allows for a clean finish if partially installing the heater into benches.

• HIVE Reflector: Can be used to reduce safety distances to combustible walls.