The compact HUUM STEEL Mini 3.5 kW sauna heater, with exceptionally short safety distances, is a wall-mounted model that is engineered for smaller sauna rooms. The STEEL Mini sauna heater is designed for sauna spaces up to 212 cubic feet (CF).



STEEL Mini Series 3.5kW Sauna Heater

Elegant design meets superior performance. The compact, wall-mounted STEEL Mini 3.5 kW electric sauna heater has an exceptionally short safety distances, ideal for smaller sauna rooms. The STEEL Mini 3.5kW sauna heater is designed for sauna spaces up to 212 cubic feet (CF).

The HUUM STEEL Mini has an exceptionally large rock capacity compared with other heaters in this power range, resulting in a more consistent heat, more steam capability, and a superior bathing experience.

Size Your HUUM Here

Required Control and sauna stones (4 boxes) sold separately


  • Slender design
  • Suitable for use in small saunas with limited space
  • Small safety distances
  • Heats up to 25% faster due to internal air duct
  • For sauna rooms from 123 to 212 cu. ft.
  • Works with UKU controls (sold separately)
  • 133 pound stone capacity (required 4 boxes sold separately)
  • Direct contact between stones and heating elements
  • More exposed stones creates a longer and milder heat
  • Stainless steel construction
  • Stainless steel, industrial quality heating elements​
  • Wall-mount model
  • Designed, engineered, and made in Estonia
  • Dimensions: 12.6″ W (320mm) x 6″ D (150mm) x 38.4″ H (975mm)
  • Limited 5-year warranty (excluding elements)


  • 3.5kW sauna heater
  • Wall fastening bracket
  • Installation and operation manual
  • 5-Year limited warranty (excluding elements)


Model STEEL Mini 3.5
Kilowatt Rating 3.5 KW
Minimum Cubic Feet 123 CF
Maximum Cubic Feet 212 CF
Heater Weight 32 lbs
Shipping Weight with Sauna Stones 165 lbs
240V, Single Phase Amperage
Width 12.6″ W (320mm)
Depth 6″ D (150mm)
Height 38.4″ H (975mm)