HUUM UKU Extension Box for Heaters over 9kW
HUUM UKU Extension Box for Heaters over 9kW

HUUM UKU Extension Box for Heaters over 9kW


Regular price$603.00

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  • Estimated arrival 4-10 days after placing the order. Please call or message the chat for precise ETAs
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HUUM UKU Extension Box for Heaters over 9kW

For use with UKU Controls, the HUUM Extension Box is required for all HUUM sauna heaters over 9kW.



  • For use with UKU controls
  • Required for all HUUM heaters over 9kW
  • Light Grey
  • Wall-mounted design
  • Designed, engineered, and made in Estonia
  • Dimensions: 7" W (178mm) x 4" D (101mm) x 10" D (254mm)
  • SGS Listed
  • Limited 5-year warranty (excluding elements)



UKU Ext Box



Circuit Breaker Amperage

2 x 63


3.25 lbs


7" (178mm)


4" (101mm)


10" (254mm)

Package Content

  • Extension box
  • Installation and operation manual
  • 5-Year limited warranty




Buyer is obligated to read user manual and follow instructions and requirements presented. Damage to the product caused by not following instructions and requirements will void warranty.

If any defects are found on the product, where manufacturer can be blamed, then buyer has the right to demand fixing or replacing the product. Demands must be made not later than 5 years after buying the product. Purchase receipt needs to be presented when warranty demands are made.

Warranty Terms:

  • Warranty applies only to electric heaters that have been used according to the manual.
  • NB! Warranty does not cover heating elements. They are considered as consumable parts.
  • Warranty does not cover wear that occurs from natural usage.
  • Warranty does not cover defects or wear caused by planned use.
  • Warranty does not imply when:
    • damage or defects are caused by transportation or other actions not controlled by the manufacturer.
    • product has been damaged by carelessness or overload • product has not been installed correctly
    •  product has been modified in any way
    • warranty period is over
    • product is not complete


Have a Question?

Talk to one of our trusted experts today! Our customer support team would love to answer any questions you might have. Call us if you want to place the order over the phone (855) 601-2444 or send us your inquiry via chat.