Top Authorized Dealer Manufacturer's Warranty Included

UKU Extension Box for Heaters over 12kW

by HUUM Sauna Heaters

SKU H2003012

Top Authorized Dealer Manufacturer's Warranty Included

UKU Extension Box for Heaters over 12kW

by HUUM Sauna Heaters

SKU H2003012

Save $126.00

$899.00

$899.00 - $899.00

$899.00

$773.00

$773.00 - $773.00

$773.00

Availability:

in stock, ready to be shipped

Quantity

Excellent

448+ 5-Star
Reviews
Full Manufacturer's Warranty
Fastest Delivery Guaranteed
Top Authorized Retailer

Next Batch Status (In Transit)

No ETA yet

This unit is currently on the water and en route to our warehouse. Inventory from this shipment is being allocated strictly on a first-come basis. Secure your order today to claim a unit from this specific batch and guarantee priority dispatch.
Warning: Once this shipment is fully allocated, the waitlist for the next production run is 8–12 weeks.

448+ Verified Homeowner Reviews

Don’t take our word for it. Read honest feedback from real customers who have installed and used these exact units.

Comprehensive Factory Warranty

Your investment is 100% protected. We facilitate direct manufacturer coverage on wood, heaters, and controls. No loopholes.

Certified HUUM Sauna Heater Partner

Guaranteed authentic inventory. Buying from unverified sources voids your warranty. Buy direct from the experts.

Secure Freight Scheduling

Heavy units require specialized care. We inspect, palletize, and coordinate secure carrier pickup within 7 business days to ensure damage-free arrival.

Learn more about the

UKU Extension Box for Heaters over 12kW

Description
Documents
Warranty
The Topture™ Standard

Description

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

Sauna control sold separately

Weights & Dimensions

Width	7" (178mm)
Depth	4" (101mm)
Height	10" (254mm)
Weight	3.25 lbs

Features

Voltage	240
Circuit Breaker Amperage	2 x 63
Features	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 3-year warranty (excluding elements)

WARNING California's Proposition 65

Documents

User Manual

Warranty

Warranty

Products and Warranty Period

Huum Product Warranty Period

Read the full LIMITED WARRANTY TERMS AND CONDITIONS

The Topture™ Standard

1. Engineering-Grade Expertise (Not Just Salespeople) Unlike standard retailers, our team includes a mechanical engineer with 20 years of experience and technicians with 55+ years in the field. We don’t just sell boxes; we understand the electrical, spatial, and mechanical requirements of your home. You get clinical-level advice, not a sales pitch.

2. Authorized Retailer & Full Warranty We are a fully authorized partner for every brand we carry. This guarantees you receive authentic, factory-fresh equipment with a valid manufacturer's warranty. Zero grey-market risks. Zero voided warranties.

3. 100% Insured Priority Shipping We treat your order with urgency. We utilize strategic US-based warehouses for 24-48 hour dispatch on most items. Crucially, every shipment is 100% insured. If your item arrives with even a scratch, we handle the claim and replacement immediately at no cost to you.

4. No Sales Tax & Best Price Guarantee The price you see is the price you pay. We charge No Sales Tax (except where required by law) and no hidden handling fees. Find a lower price at another authorized dealer? We will match it instantly.

5. Nationwide Installer Network Need more than just delivery? We maintain a directory of independent professionals across the country. We can provide you with access to our list of recommended installers to help get your wellness space up and running without the headache.

6. Lifetime Technical Support Your relationship with us doesn't end at checkout. You get lifetime access to our US-based support team for installation guidance, troubleshooting, and usage protocols.

THEM


Customer Support	Lifetime Expert Support & Installation Guidance	Unresponsive chat bots
Shipping & Handling	Fully Insured, Specialized Heavy-Freight Handling	Cheap delivery (Damage risk)
Availability & Speed	Priority Dispatch: Ships from US Warehouses	Non-priority lead times
Product Authenticity	Authorized Retailer for Top-Tier Brands	Limited selection, lower-quality
Instalment Payments	Flexible Monthly Installment Plans	Full payment upfront only

Let customers speak for us

from 448 reviews

We should have bought it years ago

We thought about buying a sauna for years and finally did. We absolutely love it, especially in the winter. It’s incredibly easy to assemble with two people the whole family uses it.

J.

Finnmark FD-1 Full-Spectrum Infrared Sauna | 1-Person Infrared Sauna

09/27/2025

Packaged well. Product as advertised. Serious customer service.. Order with confidence.

Robert B.

Mesa WS-301/WS-301A- Blue Glass Steam Shower

12/21/2024

True North 5 Person Sauna

I purchased this Sauna in White Cedar with 2 Windows and the Harvia Electric Heater and absolutely love it! It was easy to assemble in a few hours and is very high quality. I got the manual dial and it heats up quickly and provides up to 80% humidity when putting water on the rocks. The instructions were excellent and no extra help was required. It was shipped to me in the US and although it took awhile to receive because of a manufacturing issue, Topture kept on top of the situation and kept me in the loop from start to finish. They are an xlnt company to purchase from. Sandy Potter

Sany P.

True North Sauna 5 Person Outdoor Traditional Cabin Sauna

09/25/2024

Handles snow and cold like a champ

I initially had concerns about the snow load with the True North 5 Person Outdoor Cabin Sauna, but it’s handled heavy snow with no problem at all. Paired with the HUUM Drop 7.5kW heater, it delivers an amazing, steamy sauna experience that I highly recommend. Big thanks to Topture for all the support, answering my questions, and just always being there throughout the whole process!

Robert H.

True North Sauna 5 Person Outdoor Traditional Cabin Sauna

09/21/2024

Ultimate Wellness Experience

As someone who has tried multiple saunas over the years, the Finnmark FD-4 Trinity Infrared & Steam Sauna Combo is by far the best I’ve encountered. It heats up quickly, and the infrared heat feels soothing, while the steam option delivers that classic, deeply relaxing sweat.
Installation was straightforward, and it fits perfectly in my home. My partner and I use it several times a week, and it has truly elevated our wellness routine. Whether you’re looking for relaxation, detoxification, or just a moment of calm in your day, this sauna offers it all. Highly recommend it!

AmandaC.

Finnmark FD-4 Trinity 2-Person Hybrid Infrared & Steam Sauna & Red Light

09/07/2024

An Investment in Wellness, Exceptional Quality and Craftsmanship

I was initially hesitant about the Dundalk Leisurecraft Georgian Cabin Sauna Canadian Timber 6 Person (CTC88W) because of the size and the price point. However, after using it for a while, I can confidently say it's worth every penny. The quality of the Canadian timber is top-notch, and the craftsmanship is evident in every detail. The space easily accommodates six people, making it perfect for family gatherings or a relaxing session with friends. The heat distribution is excellent, and the cabin design gives it a rustic, cozy feel. I also appreciate the durability of the materials, which seem built to last through years of enjoyment. If you're serious about wellness and long-term value, this sauna is an excellent investment.

Michael C.

Dundalk Leisurecraft Georgian Cabin Sauna 6 Person | CTC88W

05/01/2024

Fast and reliable

Ordered Huum Wifi Controler. Shipped within a few days from Chicago to California. Great price and reliable. Benny was helpful. Will buy from them again.

christopher b.

HUUM UKU Wi-Fi Sauna Controller

12/19/2023

What customers think about the store

This store excels in customer service with knowledgeable staff, fast shipping, and quality products. Customers praise the excellent communication, professional handling of issues, competitive pricing, and reliable delivery. Products arrive well-packaged and as...

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Delivery Quality Service Shipping

Frequently Asked Questions

Where are you located, and where do you ship from?

We are a U.S.-operated company with our main headquarters in Sheridan, Wyoming.

Orders are shipped across the continental U.S. from our network of warehouses, managed by our logistics partners in California, Illinois, Texas, New York, Florida, and Toronto.

How much is shipping?

We’re proud to offer FREE SHIPPING on all orders over $200 within the Continental United States.

The only exception is sauna stones—due to their weight and high shipping costs, we apply a shipping charge when they are purchased without a heater.

Do you provide financing?

Absolutely! To view your financing offer, simply select Shop Pay Installments as your payment method at Step 3 of checkout.

You'll need to enter a debit card to receive your offer, but don’t worry—you can still back out before completing the purchase.

How long will it take for my items to arrive?

If you order today, you can expect delivery within 5-13 business days. In-stock products typically ship within 2-6 business days, and once they leave the warehouse, transit time is usually 3-7 business days, depending on your location. Let us know if you need more details!

For pre-order or made-to-order items, the estimated delivery time frame is listed on the product page.

What happens after I place my order?

As soon as you place your order, you'll receive a confirmation email with your order details—be sure to keep it for your records. Once we process your order, we'll begin preparing it for shipment. As soon as it ships, you'll receive another email with tracking information.

1-2 days before delivery, the delivery team will call you to schedule an appointment. You’ll need to be home to accept and sign for the delivery at the scheduled time.

Is there a warranty?

Yes, all products come with a manufacturer warranty. You can find the specific warranty details for each product under the "Warranty" tab on its product page.

Do you have a showroom?

We don’t have a showroom, which means we can bring you the lowest prices as we don’t need to worry about any extra costs!

Where do you deliver to?

We offer free Curbside Delivery to all 48 lower states and for some products even Canada.

Do you ship internationally?

International Shipping

Yes, we offer international shipping for many of our products. Customers outside the US can request a personalized shipping quote by contacting us. Please be aware that any applicable taxes or customs fees will be the responsibility of the customer. Note that some items may be subject to shipping restrictions.

Shipping to Hawaii, Alaska, and Puerto Rico

We ship to Hawaii, Alaska, and Puerto Rico, although most items are subject to additional shipping fees. To obtain specific rates and prevent any restocking fees, please email us at contact@topture.com.

UKU Extension Box for Heaters over 12kW

UKU Extension Box for Heaters over 12kW