HUUM STEEL Electric Sauna Heater
HUUM STEEL Electric Sauna Heater
HUUM STEEL Electric Sauna Heater
HUUM STEEL Electric Sauna Heater
HUUM STEEL Electric Sauna Heater
HUUM STEEL Electric Sauna Heater
HUUM STEEL Electric Sauna Heater
HUUM STEEL Electric Sauna Heater
HUUM STEEL Electric Sauna Heater
HUUM STEEL Electric Sauna Heater

HUUM STEEL Electric Sauna Heater

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HUUM Steel Electric Sauna Heater

Enjoy a superior sauna experience while adding beauty to your home!

The HUUM STEEL Electric Sauna Heater is a slim and space-efficient unit with remarkably small safety distances, making it perfect for saunas with limited space. Thanks to its well-optimized structure, the safety distances from the walls are brought down to just 2" (5 cm) with smaller models and to 4" (10 cm) with larger models. The STEEL Mini heater also comes in an even slimmer 3.5 kW wall-mounted model which is particularly suitable for very small sauna rooms.

Because of its intelligent design, the STEEL has a much higher stone capacity than other similar sized heaters. This provides a more consistent steam and higher heat. Everything you need for an elevated sauna experience. 

The HUUM STEEL is made of durable stainless steel, ensuring years of use and it comes with a 5 year warranty. 

UKU Controllers

The STEEL is controlled by the elegant UKU Controller (required for operation), in your choice of 9 different finishes. Choose from these options in either a locally controlled or WIFI enabled controller for remote use--heat up the sauna from your car on the way home!

The STEEL requires 331 lbs of stones. We recommend any type of igneous stones 5-10cm in size, or you can purchase 10 boxes of HUUM High Quality Olivine Stones which are collected in Finland.

Add the HUUM STEEL Safety Rail for added safety and an aesthetic touch.


  • Sleek design
  • Suitable for use in saunas with modest space
  • Small safety distances
  • Heats up to 25% faster due to internal air duct
  • For sauna rooms from 123 to 600 cu. ft. (see Specification Tab for sizing)
  • Works with UKU controls (sold separately)
  • 331 pound stone capacity (133 lbs for STEEL Mini): requires 10 or 4 boxes respectively--sold separately)
  • Direct contact between stones and heating elements
  • More exposed stones create a longer and milder heat
  • Stainless steel construction
  • Stainless steel, industrial quality heating elements​
  • Floor standing model (STEEL Mini is wall-mounted)
  • Designed, engineered, and made in Estonia
  • Limited 5-year warranty (excluding elements)

Choosing the right size:

STEEL Mini 4 - 3.5 kW Heater - For sauna rooms from 123 - 212 cubic feet

STEEL 6 - 6.0 kW Heater - For sauna rooms from 176 - 353 cubic feet

STEEL 9 - 9.0 kW Heater - For sauna rooms from 317 - 529 cubic feet

STEEL 11 - 10.5 kW Heater - For sauna rooms from 353 - 600 cubic feet

Package contents:

  • Sauna Heater
  • Wall-mount bracket (STEEL Mini)
  • Installation and operation manual
  • 5-year limited warranty (excluding heating elements)

Required for operation:

  • UKU Control
  • Stones 

Technical Specifications:

STEEL Mini 4

  • Dimensions: 12.6" W (320mm) x 6"D (150mm) x 38.4"H (975mm)
  • kW: 3.5
  • Volts: 240 
  • Amps: 14.58
  • Phase: 1PH
  • Room Volume: 123 - 212 CU. FT.
  • Rock Capacity: 122 lbs
  • Weight: 32 lbs 


  • Fuse: 20 A
  • Supply voltage:  240 V 1~
  • Power cable 12 AWG

      Safety Distances: (Refer to diagram below):

  • A - 50 mm
  • B - 420 mm


  • Dimensions: 12.6" W (320mm) x 12.6"D (320mm) x 38.4"H (975mm)
  • kW: 6.0
  • Volts: 240 
  • Amps: 25
  • Phase: 1PH
  • Room Volume: 176 - 353 CU. FT.
  • Rock Capacity: 331 lbs
  • Weight: 33 lbs 


  • Fuse: 30 A
  • Supply voltage:   240 V 2~
  • Power cable:  10 AWG

      Safety Distances: (Refer to diagram below):

  • A - 50 mm
  • B - 420 mm

    STEEL 9

    • Dimensions: 12.6" W (320mm) x 12.6"D (320mm) x 38.4"H (975mm)
    • kW: 9.0
    • Volts: 240 
    • Amps: 37.5
    • Phase: 1PH
    • Room Volume: 317 - 529 CU. FT.
    • Rock Capacity: 331 lbs
    • Weight: 33 lbs 


    • Fuse: 50 A
    • Supply voltage:   240 V 2~
    • Power cable: 8 AWG

          Safety Distances: (Refer to diagram below):

    • A - 100 mm
    • B - 520 mm

      STEEL 11

      • Dimensions: 12.6" W (320mm) x 12.6"D (320mm) x 38.4"H (975mm)
      • kW: 10.5
      • Volts: 240 
      • Amps: 43.75
      • Phase: 1PH
      • Room Volume: 353 - 600 CU. FT.
      • Rock Capacity: 331 lbs
      • Weight: 35.3 lbs 


      • Fuse: 50 A
      • Supply voltage:   240 V 2~
      • Power cable: 6 AWG

            Safety Distances: (Refer to diagram below):

      • A - 100 mm
      • B - 520 mm

         Safety Distances Diagram




          The purchaser is obliged to review the user manual of the product and follow the requirements stated therein. The warranty does not extend to failures due to non-compliance with the rules of use provided for in the manual. The warranty is valid, if the product has a technical defect or fault caused by the manufacturer.

          • The warranty covers the replacement of the product or of parts with manufacturing defects.
          • The warranty period is 5 years from the date of purchase.
          • NOTICE: The warranty is based on the presentation of the purchase receipt/invoice. The right to submit a claim is valid on the condition that the product has been used only for the intended purpose and conditions.

          Warranty terms:

          • NOTICE: The warranty does not extend to heating elements of the electric heaters, these are considered expendable parts.
          • The warranty does not cover the defects caused by normal wear and tear of the product.
          • The warranty does not apply to heater stones.

          Warranty does not cover the defects which are caused by:

          • Transport and other accidental damage to the product;
          • Careless or improper storage and use of the product and overloading;
          • Failure to comply with the instructions for installation and operation of the product and safety requirements.

          Warranty does not apply:

          • If the product has been repaired by an unauthorized person, if non-approved parts have been added to the product, or if consumables not accepted by the manufacturer have been used (e.g. heating elements);
          • If the set of product is not complete.