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HUUM STEEL Mini 3.5kW 240V Electric Sauna Heater – Complete Package (UKU WiFi Control)

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Original price $4,023.00
Original price $3,578.00 - Original price $4,315.00
Original price $4,023.00
Current price $3,620.00
$3,220.00 - $3,883.00
Current price $3,620.00
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Controller Finish: UKU GLASS Black

This HUUM STEEL Mini 3.5kW Electric Sauna Heater Package (UKU WiFi Control) comes complete with the traditionally designed STEEL Mini 3.5kW sauna heater, UKU WiFi control, and sauna stones - everything you need to build your dream sauna experience. The package has been combined for use in sauna rooms from 106 to 177 cubic feet.

The HUUM STEEL Mini 4 Electric Sauna Heater delivers powerful performance in a compact, modern design—perfect for small home saunas or limited spaces. Its slim, vertical form allows for easy wall mounting while maintaining short safety distances, maximizing usable space inside the sauna.

Crafted with precision, the STEEL Mini 4 holds up to 60 kg (132 lb) of sauna stones, ensuring consistent and even heat distribution. An integrated air tunnel promotes faster heating and improved airflow, enhancing the overall efficiency of each session.

Encased in durable stainless steel, the STEEL Mini 4 brings both functionality and contemporary elegance to your sauna.

For added safety and visual harmony, pair the heater with a HUUM safety railing or a custom-built guard.

Features

STEEL Mini 3.5kW Sauna Heater

  • Slender design
  • Suitable for use in small saunas with limited space
  • Control with a mobile app
  • 132 lb stone capacity
  • 240V/1PH operation
  • Stainless steel, industrial quality heating elements
  • Wall-mount model
  • Soft and long-lasting steam
  • Designed, engineered, and made in Estonia
  • SGS listed
  • 3-year residential warranty and 1-year commercial warranty (excluding elements)

UKU WiFi Control

  • Elegant heater control display panel
  • Display panel can be recessed or surface-mounted
  • Built-in WiFi interface for HUUM mobile app
  • 8 language options: English, German, Russian, Italian, Finnish, and Estonian
  • Unlimited number of users
  • Notification when set temperature is reached
  • Settable on/off, time, temperature, and delay
  • Settable temperature range of 104–230°F
  • Delayed start up to 48-hours in advance
  • Inside/outside sauna room installation (For outdoor installations, control must be placed in an enclosed weatherproof box)
  • Optional smart heating setting
  • Available decorative control display panels
    • GLASS: Black/Mirror/Gold
    • CLASSIC: Black/White/Wood
  • Displays set temperature and room temperature
  • Temperature sensor
  • Door sensor to keep the heat inside the room
  • Remotely located main control module
  • Connects to lights and ventilation
  • Overheat protection
  • Child safety lock
  • 3-year residential warranty and 1-year commercial warranty

Sauna Stones 12

  • Olivine diabase sauna stones
  • Rounded shape to complement heater design
  • Durable with high-heat capacity
  • Stones range from 1" to 2" (3–5 cm)

Specifications

Sauna Room Size
106–177 cu. ft.
Power Rating
3.5 kW
Voltage / Phase / Amperage
240V / 1PH / 14.58A
Stone Capacity
132 lb
Temperature Range
104–230°F
Weight
32 lb
Shipping Weight with Sauna Stones
165 lb
Dimensions
12.6"W × 6"D × 38.4"H (320 × 150 × 975 mm)
Safety Distances
A: 2" (50 mm)
B: 16.1" (420 mm)

What's Included 

STEEL Mini 4 Sauna Heater

  • 3.5kW electric sauna heater
  • Wall fastening bracket
  • Installation and operation manual

UKU WiFi Control

  • Control display panel
  • Main control module
  • Temperature sensor
  • Door sensor
  • Control display panel cable
  • Temperature sensor cable
  • Door sensor cable

Sauna Stones 12

  • 132 lb of 1" to 2" (3–5 cm) round sauna stones

Manuals & Resources

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HUUM is a pioneering Estonian brand known for modern electric heaters and wood-burning stoves that combine minimalist design with high-performance heating.

Designed for both residential and light commercial saunas, HUUM products feature high stone capacity for a softer, more even heat, along with precise control options and a clean, contemporary aesthetic.

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