HUUM STEEL 11 (10.5 kW) Electric Sauna Heater

Optimize your sauna experience with the HUUM STEEL 11, a high-performance electric heater designed specifically for medium-to-large sauna rooms with limited floor space. This slim, sculptural heater combines modern Nordic aesthetics with precision engineering, allowing for remarkably small safety distances to walls. Perfect for custom-built residential or commercial saunas, the STEEL 11 ensures a luxurious, soft steam (Loyly) experience characteristic of a premium Estonian spa.

Despite its slender profile, the STEEL 11 features a high stone capacity and a unique internal air duct structure that allows it to heat 25% faster than comparable heaters in its class.

Slim & Space-Saving Design

The STEEL series is engineered for installations where maximizing interior space is a priority. Its well-optimized structure allows for an industry-leading safety distance of just 4 inches from combustible walls. This makes it an ideal choice for larger sauna rooms where traditional floor-mounted heaters would be too bulky or require excessive clearance.

Superior Heating & Steam

The HUUM STEEL 11 is built with an integrated internal air duct that optimizes airflow, significantly reducing heat-up times and ensuring an even thermal climate throughout the room. With a massive stone capacity of 331 lbs (150 kg), the heater provides exceptional heat retention and steam production. When water is poured over the stones, the STEEL 11 generates the soft, consistent steam that is essential for an authentic Finnish or Estonian sauna session.

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 exposes a massive surface area of the stones to the air for efficient heat radiation.

Professional-Grade Control & Integration

Designed for high-performance use, the STEEL 11 (10.5 kW) operates on a 240V 1-phase connection (50 amp). To manage the high power output, this model requires the HUUM UKU Extension Box in addition to a UKU control system. This setup allows for precise temperature management and, with the Wi-Fi option, the ability to preheat your sauna directly from your smartphone.

Features

• Slim & Vertical Profile: Optimized for larger saunas with limited wall clearance.

• Rapid Heating: Integrated air duct ensures 25% faster heat-up times.

• Small Safety Clearances: Can be installed just 4" from combustible walls.

• High Stone Capacity: Holds 331 lbs of stones for superior heat retention and steam.

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

• Modern Aesthetic: Minimalist cage design provides a sculptural centerpiece.

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

Specifications

• Power Output: 10.5 kW.

• Sauna Room Size: 354 – 566 cubic feet (10 – 16 m³).

• Stone Capacity: 331 lbs (150 kg).

• Dimensions: 12.6" W x 12.6" D x 38.4" H.

• Electrical: 240V, 1-phase, 43.75 Amps (50 amp breaker, 6 AWG wire).

• Weight: 15 kg (Approx. 33 lbs) without stones.

• Warranty: Manufacturer's limited warranty included.

Required & Recommended Accessories

• UKU Extension Box: Required for operation of the 10.5 kW model.

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

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

• STEEL Reflector: Can be used to further reduce safety distances to walls.

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