HUUM Steel 9 Sauna Heater – 9.0kW

Elegant & Long-Lasting Steam, Perfect for Smaller Saunas

The HUUM Steel 9 is a slim, free-standing electric sauna heater designed for sauna rooms from 318 to 530 cubic feet. Its compact form, coupled with exceptionally small safety distances, makes it ideal for saunas with limited space. With a stone capacity of 331 pounds, this heater delivers a soft, consistent heat and long-lasting steam, creating a premium sauna experience for both wet and dry use.

Built from durable stainless steel and equipped with industrial-grade heating elements, the Steel 9 is engineered so sauna stones are placed directly against the heating elements for efficient heat transfer.

Crafted in Estonia, HUUM Steel heaters are SGS Listed for safety and quality and come with a 5-year limited warranty (excluding elements).

Key Features

Design and Build

• Slim, space-saving stainless steel design

• Large stone capacity: 331 lbs (150 kg)

• Free-standing installation

• Optimized internal air duct allows heating up to 25% faster

Performance

• Power: 9.0 kW

• Sauna size: 318 – 530 cu. ft. (9 – 15 m³)

• Suitable for wet or dry sauna use

• Direct stone-to-element contact for efficient heating

Controls

• Requires HUUM UKU control unit (sold separately)

• Options: UKU Local, UKU Wi-Fi, or UKU Glass Wi-Fi

• Manage temperature, timers, steam, and lighting with ease

• Wi-Fi options allow remote control via the HUUM mobile app

Certification and Warranty

• SGS Listed for quality and safety

• Precision engineered in Estonia

• Backed by HUUM’s 5-year limited warranty (excluding elements)

Sauna Stones

• Stones are not included with the heater

• Recommended: rounded olivine diabase stones (3–5 cm)

• Rounded stones enhance steam quality and complement the heater’s design

• Decorative stones are not recommended, as they may crack under heat

Package Contents

• HUUM Steel 9 kW sauna heater

• Installation and operation manual

Specifications

• Model: STEEL 9.0

• Power: 9.0 kW

• Sauna size: 318 – 529 cu. ft.

• Heater weight: 33 lbs

• Shipping weight with stones: 364 lbs

• Voltage: 240V, single-phase

• Amperage: 37.5A

• Circuit breaker: 50A

• Wire size: 8 AWG

• Dimensions: 12.6"W × 12.6"D × 38.4"H (320 × 320 × 975mm)

• Safety distances: A = 4", B = 20.5"

Model Comparison