Huum Uku Controller Extension Power Box On Black Sauna Cladding.
Huum Uku Extension Box, White Wall-Mounted Enclosure For Huum Sauna Heaters Rated 12 Kw And Above, On Thermally Modified Aspen Sauna Cladding
Expert help that stays with you

Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is still easy to fix.

Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

Sauna and heater customers also receive free shipping on sauna accessories for life.

Planning a sauna, or need help with one you purchased from us? Our founders have built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Ask a product question.

Specs
Weight3.25 lbs
Dimensions7.0 × 7.0 × 6.0 in
Includes

What Is Included

All configurations

Included with purchase

Extension box installation and operation manual.

Contents vary by configuration. Check the row for the option selected above.

How It Fits

How This Product Fits the System

What it is used for

The UKU Extension Box works with the UKU control system on the specified higher-output heater installation. Full-size HIVE 12, 15 and 18 kW require it. It does not replace the UKU controller or main module.

What to plan

  • Match heater family, voltage, phase, maximum load, power unit, sensors, and control generation as one system.
  • Confirm whether the selected package includes the display, main module, sensors, cables, and any required extension box.
  • Sensor placement, door interlock, remote-start rules, and cable routing must follow the current control manual.

Choose the matching heater

Start with the heater for a new sauna; use the exact part for an existing installation.

  • HUUM HIVE Heater family for this accessory; use the exact model and installation instructions.
Gallery
Huum Uku Controller Extension Power Box On Black Sauna Cladding.
Huum Uku Extension Box, White Wall-Mounted Enclosure For Huum Sauna Heaters Rated 12 Kw And Above, On Thermally Modified Aspen Sauna Cladding

    HUUM UKU Extension Box

    The UKU Extension Box works with the UKU control system on the specified higher-output heater installation. Full-size HIVE 12, 15 and 18 kW require it. It does not replace the UKU controller or main module.

    Choosing the heater too? Start with HUUM HIVE to size the heater and choose the rest of your package.

    Choose your HUUM HIVE package →

    Build Your Quote:

    $773.00

    Share your selected options and add-ons. Prices and availability are confirmed when the link is opened.

    Pay over time:

    Choose Affirm at checkout to see your payment options. Approval and terms depend on eligibility.

    Pay with HSA/FSA:

    We teamed up with FLEX to make HSA/FSA payments easier than ever.

    HUUM

    What HUUM owners say

    Public reviews and notes owners sent our team, word for word. Names are shortened to a first name and last initial, or to initials.

    “Heat quickly love the Wi-Fi”

    Steven B. · HUUM DROP owner

    “These guys have been excellent to work with. It wouldn’t have made sense to buy from anyone else. Top 5 customer service experience”

    Ryan P. · HUUM DROP owner

    “Very happy with all aspects of the purchase transaction. Ben was great to work with!”

    William C. · HUUM HIVE owner

    “Works and looks amazing. Very hot heater.”

    Alan S. · HUUM DROP owner

    “Your service is very high and I commend you on that.”

    William R.

    “Oh my goodness, you have gone above and beyond!! I ordered a stove on Friday; we are very excited and very appreciative of your excellent customer service!”

    Kristin D.

    “You and Ben B have been amazing so please know I really appreciate all your help and support.”

    Matt G. · Auroom Cala Glass Mini owner

    The power extension for a larger HUUM heater

    The UKU Extension Box works with the UKU control system on the specified higher-output heater installation. Full-size HIVE 12, 15 and 18 kW require it. It does not replace the UKU controller or main module.

    Choosing the heater too? Start with HUUM HIVE to size the heater and choose the rest of your package.

    Choose your HUUM HIVE package →

    Questions before you order

    Do I need a complete heater package?

    For a new sauna, start with the linked heater and choose the required controls, stones and installation accessories there. For an existing installation, buy the exact matching component from this page.

    Can you help match the part?

    Yes. Call (844) 565-1113 or contact Sauna Marketplace with your model label and the part you need.

    Expert help that stays with you

    Small details become expensive problems once installation begins. We ask the questions early, so a mismatched part, an overlooked requirement or an installation issue gets caught while it is still easy to fix.

    Our job does not end when your order ships. We stay available through installation and beyond. If something needs attention, we stay involved, work the problem, and help see it through.

    We want you to feel good about choosing Sauna Marketplace long after your first session, and confident recommending us to a friend. That standard guides the advice we give, the products we sell, and the way we take care of our customers.

    Sauna and heater customers also receive free shipping on sauna accessories for life.

    Planning a sauna, or need help with one you purchased from us? Our founders have built saunas from the crate up and both run saunas at home. New customers and existing Sauna Marketplace sauna and heater owners can Ask a product question.

    Specs
    Weight3.25 lbs
    Dimensions7.0 × 7.0 × 6.0 in
    Includes

    What Is Included

    All configurations

    Included with purchase

    Extension box installation and operation manual.

    Contents vary by configuration. Check the row for the option selected above.

    How It Fits

    How This Product Fits the System

    What it is used for

    The UKU Extension Box works with the UKU control system on the specified higher-output heater installation. Full-size HIVE 12, 15 and 18 kW require it. It does not replace the UKU controller or main module.

    What to plan

    • Match heater family, voltage, phase, maximum load, power unit, sensors, and control generation as one system.
    • Confirm whether the selected package includes the display, main module, sensors, cables, and any required extension box.
    • Sensor placement, door interlock, remote-start rules, and cable routing must follow the current control manual.

    Choose the matching heater

    Start with the heater for a new sauna; use the exact part for an existing installation.

    • HUUM HIVE Heater family for this accessory; use the exact model and installation instructions.
    Gallery
    Huum Uku Controller Extension Power Box On Black Sauna Cladding.
    Huum Uku Extension Box, White Wall-Mounted Enclosure For Huum Sauna Heaters Rated 12 Kw And Above, On Thermally Modified Aspen Sauna Cladding