HUUM UKU Extension Box


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SKU H2003012 Category

The HUUM UKU Extension Box is an essential component designed for use with UKU Controls, specifically required for all HUUM sauna heaters with a power output exceeding 12kW. This extension box facilitates the safe and efficient operation of high-powered sauna heaters, ensuring optimal performance and functionality.


  • Compatibility: The UKU Extension Box is designed for seamless integration with UKU Controls, serving as a necessary component for HUUM sauna heaters exceeding 12kW in power output.
  • Required for High-Powered Heaters: This extension box is specifically required for all HUUM sauna heaters with a power output exceeding 12kW, ensuring compliance with safety standards and regulatory requirements.
  • Light Grey Design: Featuring a light grey exterior, the extension box offers a sleek and modern appearance that complements various sauna environments and decor styles.
  • Wall-Mounted Design: The extension box is designed for wall-mounted installation, providing a secure and convenient mounting solution that helps conserve space within the sauna area.
  • High-Quality Construction: Crafted with precision engineering and quality materials, the extension box is designed, engineered, and made in Estonia to meet stringent performance and durability standards.
  • SGS Listed: The extension box is SGS listed, indicating compliance with international safety and quality standards, ensuring peace of mind for users.
  • Dimensions: With dimensions measuring 7″ in width, 4″ in depth, and 10″ in height, the extension box offers a compact yet functional design suitable for various sauna installations.
  • 5-Year Limited Warranty: Backed by a limited 5-year warranty (excluding elements), the


  • Model: UKU Ext Box
  • Voltage: 240
  • Circuit Breaker Amperage: 2 x 63
  • Weight: 3.25 lbs
  • Width: 7″ (178mm)
  • Depth: 4″ (101mm)
  • Height: 10″ (254mm)


Resources:        UKU Warranty             UKU Extension Box Manual 2022