HUUM Steel Compact Wall-Mounted Electric Sauna Heater

The HUUM Steel is an advanced, larger version of the Steel Mini, designed to deliver exceptional heating performance in medium-sized saunas. Available in 6 kW, 9 kW, and 10.5 kW models, this heater upholds HUUM’s hallmark of high stone capacity and efficient heat distribution — offering both beauty and power in a sleek, space-saving design.

With the ability to hold up to 10 boxes of stones (approx. 150 kg / 330 lb), the HUUM Steel ensures long-lasting heat and rich steam production, thanks to its extensive thermal mass. Its slim, rectangular shape and minimal safety distance requirements make it perfect for saunas where space is limited, while its clean, modern look complements contemporary interiors.

Key Feature: Integrated Air Tunnel

A standout innovation of the HUUM Steel is its integrated air tunnel system, which fully covers and protects the heating elements while improving airflow.
This design enhances efficiency by reducing heat-up time and extending the lifespan of the elements. The Steel and Cliff models are the only heaters in the HUUM lineup featuring this advanced air tunnel technology — setting them apart in both performance and durability.

Performance and Experience

Like all HUUM heaters, the Steel model blends modern aesthetics with functional excellence.
It supports WiFi control via the UKU system, allowing you to manage temperature, schedule heating, and enjoy your sauna experience remotely.
With a maximum temperature of 110°C and a large stone capacity, the HUUM Steel provides gentle, even heat and consistent steam — ensuring an authentic and luxurious sauna atmosphere.

Heater Includes

• Adjustable legs (raise the heater up to 7 cm)

Additional Requirements

• UKU sauna control system

• 150 kg (330 lb) of sauna stones (diameter: 3–5 cm / 1.2–2 in)

Details

• Sauna room size: 8–13 m³ (283–460 ft³)

• Stone capacity: 150 kg (330 lb)

• Weight: 15 kg (33 lb)

• Height: 975 mm (38.4 in)

• Width: 320 mm (12.6 in)

• Depth: 320 mm (12.6 in)

• Safety distances: See drawing tab below

Please note: Electrical installation is not included. For safety and compliance, all electrical work should be carried out by a licensed electrician, following local electrical codes and the manufacturer’s installation guidelines.