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HUUM heaters, controls, and accessories ship using the appropriate delivery method. Receive tracking information once available, with assistance throughout the delivery process.


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The HUUM UKU Extension Box is required any time a larger HUUM electric sauna heater is paired with a UKU control. When your heater output is above about twelve kilowatts the extension box expands the switching capacity of the system so the UKU control can safely manage the higher power load while keeping wiring clean and organized.
| Brand | HUUM |
| Product | UKU Extension Box |
| Model | H2003012 |
| Use case | Required for HUUM heaters above twelve kilowatts when paired with UKU controls |
| Compatible controllers | HUUM UKU Local and HUUM UKU Wi Fi |
| Mounting | Wall mount |
| Enclosure dimensions | About seven inches wide by seven inches deep by six inches high |
| Weight | About three and one quarter pounds |
| Electrical supply | Two hundred forty volt control |
| Maximum control current | Two by sixty three amp control circuits |
| Housing color | Light grey |
| Certifications | CE SGS IPX4 |
Use the product only with compatible sauna equipment and follow its manufacturer instructions. Keep accessories away from heating elements unless the manual explicitly allows direct heater placement. Allow hot items to cool before handling and keep them out of children's reach.










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Discover HUUM's premium sauna heaters and smart controls, backed by personalized product guidance, reliable order communication, and dedicated customer support.
HUUM heaters, controls, and accessories ship using the appropriate delivery method. Receive tracking information once available, with assistance throughout the delivery process.
Made in Estonia, HUUM heaters combine award-winning Nordic design with generous stone capacity for a gentle, long-lasting steam experience.
Get personalized assistance with HUUM heater sizing, UKU controller compatibility, and installation requirements to ensure you choose the right setup.
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