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HUUM STEEL Mini Series 3.5kW Sauna Heater

A 3.5kW HUUM STEEL Mini electric heater — slender wall-mount design with exceptionally short safety clearances, built for tight small-sauna spaces.

Current price $1,576
$1,576 - $1,576
Current price $1,576
Original price $1,899
Save $323
Original price $1,899 - Original price $1,899
Original price $1,899
+ Free Shipping Free Delivery within the Continental US
  • 132 lbs of stone capacity: longer, milder heat from more exposed stones.
  • Stainless steel construction with industrial-grade heating elements.
  • Pairs with HUUM's UKU controls (sold separately) for full sauna scheduling.
Includes $348 in free bonuses
The Sauna Mastery Protocol Digital Guide
The Sauna Mastery Protocol Digital Guide
$49 FREE
Full-Value Freight Protection
Full-Value Freight Protection
$299 FREE

Perfect for sauna rooms from 106 - 177 ft3

Select Stones

Required for Operation

Select Sauna Control

Required for Operation

HUUM STEEL Mini Series 3.5kW Sauna Heater $1,576
Free shipping (contiguous US) FREE
Free bonuses included $348 FREE
Total $1,576
  • Secure checkout
  • 30-day guarantee
  • 3 Year warranty
In stock — estimated delivery:

See What People Are Saying…

“This has completely transformed my workspace. The natural light is a game changer!”

Lisa R.
Verified owner

“Built it in a weekend with my brother. Glass front is the move — feels like a real room, not a closet.”

Mark T.
Verified owner

“I love the design and how easy it was to set up. Highly recommend for any home owner.”

James K.
Verified owner
Description

The compact STEEL Mini 3.5 kW sauna heater, with exceptionally short safety distances, is a wall-mounted model that is especially suited for modest sauna rooms. The STEEL Mini 3.5kW sauna heater is designed for sauna spaces up to 212 cubic feet (CF).

Required Control and sauna stones (4 boxes x 33 lbs of 1-2" stones
) sold separately

    Specifications
    Heater Size 3.5 kW
    Sauna Room 106 - 177 CU. FT.
    Stone Capacity 132 lbs
    Height 38.4" (975mm)
    Width 12.2" (310mm)
    Depth 6.3" (160mm)
    Weight 32 lbs
    Dimensions HUUM Steel Mini

    Safety Distance

    Heater Size 3.5 kW
    A 1.97 in (50 mm)
    B 16.54" (420 mm)

    Power

    The STEEL Mini runs on a single dedicated circuit. Figures below are taken from the current HUUM installation & operation manual. Installation must be carried out by a licensed electrician, and local code applies wherever it is stricter.

    240V Supply STEEL Mini 3.5
    Output 3.5 kW
    Current Draw 14.58 A
    Circuit Breaker 20 A
    Min. Wire Size 12 AWG

    The same heaters run on a 208V supply at reduced output, which also reduces the room they can heat:

    208V Supply STEEL Mini 3.5
    Output 2.85 kW
    Current Draw 12.5 A
    Circuit Breaker 20 A
    Min. Wire Size 12 AWG
    Sauna Room 106-159 cu. ft. (3-4.5 m³)
    Warranty

    Your Own Sauna Ritual, in 3 Simple Steps

    You don't need a sales pitch, a spec sheet to decode, or six months of forum research.

    Size it right
    Step 1

    Size it right

    Every heater page lists the exact room size it's rated for, so you can match it to your sauna before you order.

    Get it installed
    Step 2

    Get it installed

    We provide the install spec sheet your electrician needs and our team is available if questions come up.

    Real löyly
    Step 3

    Real löyly

    With the heater, stones, and room properly matched, water on the rocks delivers the steam wave and rolling heat of a true Finnish session.

    WHAT COMES WITH EVERY TOPTURE ORDER

    Claim $348 in Free Bonuses Today

    The Sauna Mastery Protocol
    BONUS 1

    The Sauna Mastery Protocol

    The session times, temperatures, and weekly rhythm that turn a sauna into a habit you keep. Covers heat-up protocols, deep sleep, recovery stacking, and what to expect across the first 30 sessions. Sent to your inbox after purchase.

    $49

    INCLUDED

    Full-Value Freight Protection
    BONUS 2

    Full-Value Freight Protection

    Large orders ship fully insured. If freight arrives damaged, Topture helps coordinate the claim and replacement process with the carrier and manufacturer. Proper inspection and damage documentation at delivery are required. Most in-stock orders ship within 2–7 business days.

    $299

    INCLUDED

    Retail Price: $1,899

    Today's price: $1,576

    Choose your options now

    REAL HOMES. REAL REVIEWS.

    See What Sauna Owners Are Saying…

    Topture is rated 4.9/5 by 461+ verified customers

    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.

    Verified owner

    Ordered this sauna fall 2024 and we love it. No better feeling during a Minnesota winter. Lastly, I have to mention the customer service for this purchase has been like no other. Any questions or requests I had were addressed immediately by Topture. I got more than I expected from them and have already recommended them to several people looking for saunas. SO if you're thinking about it, JUST DO IT already..

    Verified owner

    Thanks for the great service - greatly appreciated.

    Verified owner

    WHY BUY FROM TOPTURE?

    The sauna may be the same. The buying experience isn't.

    Buying a sauna involves more than choosing a model and clicking checkout. Heater sizing, electrical requirements, freight delivery, installation, and warranty support all matter.

    Before you buy elsewhere

    Choosing the right sauna
    Compare models across leading sauna brands based on your space, climate, capacity, preferences, and budget.
    Will they help you compare alternatives, or only answer questions about the product you've already selected?
    Heater & electrical fit
    Get help matching the heater to the sauna volume, glass area, controls, and electrical requirements.Try our heater calculator
    Ask who will check that the heater and controls are right for your installation before you order.
    Authorized products
    Products are sourced through authorized channels and include the applicable manufacturer warranty.View independent listings
    Verify that the retailer is authorized for the brand and that your manufacturer warranty will be valid.
    Freight delivery
    We help coordinate heavy-freight delivery and provide guidance on receiving and inspecting your shipment.
    Ask how the order ships, how it will be unloaded, and what happens if freight arrives damaged.
    Installation information
    We help provide the manuals, specifications, clearances, and electrical information your installer may need.
    Find out what documentation and project support will be available after checkout.
    After the sale
    Questions after delivery? We help with troubleshooting, documentation, warranty coordination, and manufacturer support.Read verified owner experiences
    Ask who you will actually contact if something doesn't work after the order arrives.
    461+ Verified Reviews

    Real homeowners, rated 4.9/5 across verified reviews.

    Lifetime Expert Support

    Same team before and after the sale, from sizing to warranty support.

    Authorized HUUM Sauna Heater Dealer

    Authorized products with the applicable manufacturer warranty.

    Full-Value Freight Protection

    Freight damage? We help coordinate the claim and replacement process.

    STILL UNSURE?

    Frequently Asked Questions

    General

    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?

    Orders over $200 ship free within the continental United States. Orders under $200 carry a small shipping fee.

    Two exceptions: SaunaLife and ThermaSol products carry a freight charge at any order value, and sauna stones ordered without a heater ship at $60 per box because of their weight.

    Every charge is shown at checkout before you pay.

    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 your order is in stock, most orders ship within 2–7 business days of purchase. Transit time then depends on the distance from the warehouse and, for freight, on booking a delivery appointment.

    For custom, pre-order or made-to-order items, the estimated delivery time frame is listed on the product page. Delivery dates are estimates, so please don't book installation labor until your order has arrived and been inspected.

    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 your order ships, you'll receive another email with tracking information.

    For freight deliveries, the carrier will call or text you to schedule an appointment once the shipment reaches their local terminal. Someone needs to be there to inspect the shipment and sign for it. Smaller parcels arrive by UPS or FedEx without an appointment.

    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 — we sell online. Our team is available by phone, email and chat to help you compare models, sizes and heaters, and we can send dimensions, installation manuals and electrical requirements before you buy.

    Where do you deliver to?

    We deliver throughout the 48 contiguous states, with curbside freight delivery for large items. Free shipping and standard rates apply there only. Alaska, Hawaii, Puerto Rico, other U.S. islands and Canada are quoted separately, depending on the brand and model. We can't ship freight or oversized items to P.O. boxes.

    Do you ship internationally?

    International Shipping

    For many products, yes, including to Canada, by custom quote. Email contact@topture.com with the product and your address before you order; availability and cost depend on the brand and model. Any duties, taxes and customs fees are your responsibility.

    Shipping to Hawaii, Alaska, and Puerto Rico

    Free shipping applies to the continental United States only. Shipping to Alaska, Hawaii, Puerto Rico and other U.S. islands is quoted separately and depends on the brand and model. Email contact@topture.com for a quote before you order.

    Your electric sauna heater, done the right way.

    • 132 lbs of stone capacity: longer, milder heat from more exposed stones.
    • Stainless steel construction with industrial-grade heating elements.
    • Pairs with HUUM's UKU controls (sold separately) for full sauna scheduling.
    Includes $348 in free bonuses
    The Sauna Mastery Protocol Digital Guide
    The Sauna Mastery Protocol Digital Guide
    $49 FREE
    Full-Value Freight Protection
    Full-Value Freight Protection
    $299 FREE
    • Secure checkout
    • 30-day guarantee
    • 3 Year warranty