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HUUM UKU Ext Box | Extension Box for Heaters Over 12kW
HUUM UKU Ext Box | Extension Box for Heaters Over 12kW - Image 2

CEDAR SENSE

HUUM UKU Ext Box | Extension Box for Heaters Over 12kW

4.9/5

  • · 127 reviews

Original price was: $800.00.Current price is: $625.00.
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or from $786/mo with Affirm & Klarna

Hand-built from Grade A Knotty Western Red Cedar in Northern Minnesota.
Delivered fully assembled with our Premium Accessory Kit included.

Handcrafted to order — ships in 8–10 weeks

  • Handcrafted in Northern Minnesota
  • Delivered fully assembled
  • Includes Premium Accessory Kit
  • Lifetime craftsmanship guarantee
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SECURE CHECKOUT

SHIPPING BY LOCATION

30-DAY RETURNS

PRODUCT DESCRIPTION
SKU H2003012 - HUUM ext box Category Tags , ,
MODEL6 Person Barrel Sauna with Front Porch
EXTERIOR DIMENSIONS10′ L × 6′ W × 7′ H
INTERIOR LENGTH7′ (Front Porch: 3′)
WOODGrade A Knotty Western Red Cedar
STANDARD HEATERExternal Wood Fired Stove
CAPACITYUp to 6 adults
SHIPPING WEIGHT~1,200 lbs
ASSEMBLYDelivered fully assembled
WARRANTYLifetime craftsmanship guarantee

Each sauna is built to order in our Northern Minnesota workshop with an 8–10 week production lead time. Saunas ship fully assembled via dedicated white-glove freight, scheduled in advance by our logistics team.

Shipping is priced by destination — your final freight quote is confirmed at checkout based on delivery location.

Return any sauna within 30 days of delivery for a full refund, less return freight. Damage in transit is covered in full — simply notify us within 48 hours.

Description

HUUM UKU Ext Box Description

For use with UKU Controls, the HUUM Extension Box is required for all HUUM sauna heaters over 12kW.

Features of HUUM UKU Ext Box

  • For use with UKU controls
  • Required for all HUUM heaters over 12kW
  • 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)

HUUM UKU Ext Box Includes

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

Specifications

ModelUKU Ext Box
Voltage240
Circuit Breaker Amperage2 x 63
Weight3.25 lbs
Width7″ (178mm)
Depth4″ (101mm)
Height10″ (254mm)

Extension Boc Technicals

UKU Ext Box Manual – CLICK HERE

UKU Warranty – CLICK HERE

Additional information

Weight3.25 lbs
Dimensions10 × 7 × 4 in

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10-Year Structural Warranty • 5,000+ Happy Sauna Owners • Expert Installation Available • Handcrafted in North America • Free Shipping on Orders 10-Year Structural Warranty • 5,000+ Happy Sauna Owners • Expert Installation Available • Handcrafted in North America • Free Shipping on Orders

CEDAR SENSE

From workshop to first session.

STEP 1

Custom Order

Configure your build; we begin
production once your order is confirmed.

STEP 2

Handcrafted in Minnesota

Built by hand from Grade A Knotty
Western Red Cedar in our Northern
Minnesota workshop.

STEP 3

Fully Assembled Delivery

Arrives complete on a dedicated freight
truck — no flat-pack, no assembly.

STEP 4

Ready to Heat

Position, connect your wood-fired stove,
and step inside.

CUSTOMER REVIEWS

What Owners Are Saying

No reviews yet for this product.

★★★★★

A nightly ritual we never skip.

The cedar smell hits the moment you open the door. Heat is even, the door seals tight, and the build feels like it will last decades. Worth every dollar.

Marcus Whitfield Austin, TX VERIFIED PURCHASE
★★★★★

Genuinely flawless craftsmanship.

Pre-drilled holes lined up perfectly, hardware was stainless and substantial, and the heater was already wired. Two of us assembled it in a weekend.

Daniel Okafor Chicago, IL VERIFIED PURCHASE
★★★★★

Centerpiece of our backyard.

Guests at our rental mention the sauna in nearly every review. The barrel shape sheds snow beautifully and the interior light is so warm.

Rebecca Harmon Scottsdale, AZ VERIFIED PURCHASE

DAILY PRACTICE

The power of heat.

A consistent sauna practice compounds quietly into a measurable health investment. Regular heat exposure is linked to gains in cardiovascular conditioning, muscle recovery, and resilience to stress — benefits that build session after session.

30 min

A single sauna session can elevate heart rate to levels comparable to moderate exercise, supporting cardiovascular conditioning.

2–3×

Regular sauna use of two to three sessions per week is associated with measurable improvements in cardiovascular health in long-term studies.

20 min

Twenty minutes of heat helps relax muscles, accelerate recovery, and lower perceived stress after a long day.

ANATOMY OF THE SAUNA

Every surface, every fastener — chosen on purpose.

Grade A Knotty Western Red Cedar, an external wood-fired stove as standard (Harvia electric available as an upgrade), and marine-grade stainless steel hardware. Each component is selected for how it behaves under heat and steam, then handcrafted and fully assembled in Northern Minnesota.

OUR WORK

Real projects.

From private gardens to commercial recovery suites, every Cedar Sense build is shaped to its setting. A look at saunas we’ve delivered for owners across North America.

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Elevating Deer Camp: The Transformative Power of an Outdoor Barrel Sauna
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Is a Cedar Sauna Kit Worth the Investment?
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Should You Head to the Sauna When Feeling Sick?
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Unlock the Power of Heat: Mastering the Ideal Sauna Temperature
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East Meets West: Western Red Cedar vs Eastern Red Cedar
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Uncovering the Buzz Around Sauna Hats: What’s the Deal?
Health & Wellness
The Optimal Sauna Time: What Research Says
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Cedar Maintenance For Saunas: Just Like Caring for Your Classic Car
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Sauna Frequency: How Often Should You Really Use a Sauna?

Frequently Asked Questions

Cedar Sense helps you design and build the sauna setup that actually fits your space, budget, and lifestyle. Here are answers to the questions we get asked the most.

What types of saunas does Cedar Sense offer?

We offer outdoor barrel saunas, indoor saunas, and custom-built sauna rooms, as well as complimentary amenities like cold plunges, outdoor showers, wood-fired hot tubs, and cedar outdoor furniture. Our goal is to help you create a complete fire-and-ice experience at home or at your cabin.

Yes. We created a FREE Custom Sauna Build Guide and a simple design flow to help you plan location, layout, bench height, heating system, and ventilation before you start building.

Yes. We ship saunas, cold plunges, outdoor showers, and most cedar products across the continental United States. Shipping options and costs depend on the product and your location, which you’ll see at checkout or by requesting a quote.

For many areas in the upper Midwest, we can either provide installation/assembly options or connect you with trusted partners. In other regions, most of our saunas arrive as kits designed for a handy homeowner or local contractor. Contact us to discuss installation options in your area.

Wood-fired stoves give you a traditional, off-grid feel with a softer, “campfire” style heat and crackling ambiance. Electric stoves are cleaner, easier to control, and often available with Wi-Fi and timers. Your ideal choice usually comes down to power availability, local codes, and the sauna experience you prefer.

Lead times vary by model and season, but most saunas ship within a few weeks to a couple of months. Custom builds and special configurations may take a bit longer. We’ll provide an estimated timeline before you finalize your order.

Absolutely. We carry sauna buckets and ladles, thermometers, sand timers, essential oils, sauna sprays, flooring, clocks, and more. We also offer cold tubs, outdoor showers, and cedar furniture that pair perfectly with your sauna setup so you can create a complete backyard retreat.

Yes. The guide is 100% free. You’ll just enter your name and email so we can send you the PDF and follow up with helpful tips about planning your build. No obligation and no pressure to purchase.

GET IN TOUCH

Ready to Get Your Barrel Sauna?

Fill out the form and we’ll get back to you with answers, pricing, availability, or any help you need. We’re here to make your sauna dream a reality.

PHONE

218-760-2041

EMAIL

[email protected]

ADDRESS

1111 1st St, Waubun, MN 56589

We respect your privacy. We never spam or sell your information. Your details are used only to respond to your inquiry.

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