HUUM STEEL Mini 3.5kW 240V Electric Sauna Heater

Features

HUUM STEEL Mini 3.5kW 240V Electric Sauna Heater

• Wall-mount model
• Slender design
• Suitable for use in small saunas with limited space
• Small safety distances
• Heats up to 25% faster due to internal air duct
• For sauna rooms from 123 to 212 cu. ft.
• Works with UKU controls (sold separately)
• 133 pound stone capacity - Extra Small (3-5 cm) (required 4 boxes sold separately)
• Direct contact between stones and heating elements
• More exposed stones creates a longer and milder heat
• Stainless steel construction
• Stainless steel, industrial quality heating elements
• Designed, engineered, and made in Estonia
• Dimensions: 12.6" W (320mm) x 6" D (150mm) x 38.4" H (975mm)
• Limited 3-year residential warranty and limited 1-year commercial warranty (excluding elements)

Specifications

Includes

HUUM STEEL Mini 3.5kW 240V Electric Sauna Heater

• 3.5kW sauna heater
• Wall fastening bracket 
• Installation and operation manual
• Limited 3-year Residential Warranty and Limited 1-Year Commercial Warranty (Excluding Elements)

Manual

HUUM STEEL Mini 3.5kW 240V Electric Sauna Heater

• Installation & Operation Manual
  
• Spec Diagram
  
• Warranty
• Stone Requirements
  
• Elements Required
  
• Certificate of Compliance

Description

HUUM STEEL Mini 3.5kW 240V Electric Sauna Heater

The HUUM Steel Mini 3.5 kW (sometimes called Steel Mini 4) sauna heater is a breakthrough in compact sauna heating technology, specifically engineered for smaller sauna rooms where space is at an absolute premium. This wall-mounted model combines elegant design with superior performance, making it possible to enjoy an authentic sauna experience even in the most limited spaces. 

Designed for sauna spaces ranging from 106 to 177 cubic feet (CF), with optimal performance up to 212 cubic feet, the HUUM Steel Mini 3.5 proves that great things truly do come in small packages.

Revolutionary Wall-Mounted Design

The HUUM Steel Mini stands out as the ultimate space-saving solution in the sauna heater market. As a wall-mounted unit, it frees up valuable floor space while delivering professional-grade heating performance. What makes the Steel Mini 4 truly exceptional is its exceptionally short safety distances – a critical feature that allows installation in spaces where traditional sauna heaters simply cannot fit.

This innovative approach to heater design means you can transform compact bathrooms, closets, or other small areas into fully functional saunas without compromising on safety or performance. The HUUM Steel is a classy and powerful pick for a modern home sauna, proving that limited space doesn't mean you have to settle for a subpar sauna experience.

Compact Yet Powerful Performance

Operating as a 1PH electric sauna heater, the HUUM Steel 3.5kw 240V model is designed to work efficiently with standard residential electrical systems. This 240V sauna heater may be small, but it packs impressive heating capability for its size class. With a minimum requirement of 106 cubic feet and a maximum capacity of 177 CF, this HUUM electric sauna heater is perfectly calibrated for compact home sauna installations.

The Steel Mini meets rigorous SGS standards, ensuring that despite its compact size, it delivers on safety, quality, and reliability. This certification assures homeowners that the product has undergone rigorous testing and complies with global safety standards, offering peace of mind with every use.

Exceptional Stone Capacity for Superior Heat

Here's where the HUUM Steel sauna heater truly shines and defies expectations. The HUUM Steel Mini 3.5 sauna heater can hold around 132–133 pounds (about 60 kg) of stones, usually filled using 4 boxes of sauna stones. This is nothing short of remarkable for a 3.5 kW heater and represents a significant engineering achievement.

The HUUM Steel Mini has an exceptionally large rock capacity compared with other heaters in this power range, resulting in a more consistent heat, more steam capability, and a superior bathing experience. More sauna stones mean better heat distribution, improved temperature stability, and enhanced steam production when you pour water over the heated rocks. This translates directly to a more authentic and enjoyable sauna experience that rivals much larger, more powerful units.

The increased stone mass acts as a thermal battery, storing heat energy and releasing it gradually for that perfect, enveloping warmth that defines quality sauna sessions. When you add water to create steam, the generous stone capacity produces fuller, longer-lasting clouds of steam – that magical combination of heat and humidity that sauna enthusiasts cherish.

Smart Control Features

Despite its compact size, the Steel Mini doesn't compromise on modern convenience. The system is compatible with advanced sauna control options, including Wi-Fi connectivity through the HUUM app. This sauna heater with Wi-Fi control capability means you can manage your small sauna with the same sophisticated features available in larger installations.

Preheat your sauna remotely before you get home, adjust temperatures from your phone, and monitor your sessions with ease. The app-based control system makes operating your compact sauna effortless and intuitive, making it perfect for busy homeowners who want their sauna ready exactly when they need it.

Elegant Aesthetics for Small Spaces

The HUUM sauna heater Mini model showcases an elegant design that complements rather than crowds your small sauna space. Its sleek, minimalist profile and wall-mounted configuration create a clean, modern look that enhances your sauna's visual appeal. The premium finish and thoughtful design details ensure that even in a compact room, your heater looks sophisticated and intentional rather than cramped or utilitarian.

Perfect Solution for Urban Living

The HUUM Steel Mini 3.5 represents the ideal solution for apartment dwellers, condo owners, and anyone working with limited square footage. Urban living often means making tough choices about amenities, but the Steel Mini proves you don't have to give up your sauna dreams just because you're short on space.

Whether you're converting a small bathroom corner, utilizing a compact basement area, or building a custom small sauna enclosure, this heater makes it possible to enjoy authentic sauna experiences without requiring a dedicated sauna room. Its combination of minimal safety distances, wall-mounted installation, and exceptional stone capacity makes it uniquely suited for small-space sauna projects.

The HUUM Steel Mini 3.5 kW is a carefully engineered solution that brings professional-quality sauna experiences to spaces previously considered too small for serious sauna installations. With its stone capacity, smart connectivity, SGS certification, and space-efficient design, the Steel Mini proves that exceptional sauna experiences aren't limited by square footage.

FAQs

HUUM STEEL Mini 3.5kW 240V Electric Sauna Heater

What size sauna is suitable for the HUUM Steel Mini 3.5 kW heater?

The HUUM Steel Mini 3.5 kW is designed for sauna spaces from 106 to 177 cubic feet, with optimal performance up to 212 cubic feet.

How hot can the HUUM Steel Mini 3.5 kW get?

The HUUM Steel Mini 3.5 kW sauna heater can reach a maximum temperature of 230 °F (≈ 110 °C).

What makes the HUUM Steel Mini 3.5 kW different from other small sauna heaters?

It features exceptionally short safety distances, a wall-mounted design for maximum space savings, and a large rock capacity (4 boxes) that is higher compared to other heaters in this power range. This results in more consistent heat and superior steam capability.

How many sauna stones does the HUUM Steel Mini 3.5 kW hold?

The HUUM Steel Mini 3.5 sauna heater can hold around 132–133 pounds (about 60 kg) of stones, usually filled using 4 boxes of sauna stones.

What kind of steam does the HUUM Steel Mini 3.5kW produce?

Thanks to its exceptionally large stone capacity, it produces fuller, longer-lasting steam with superior steam quality. The increased stone mass provides more consistent heat and enhanced steam production capability.

Can the HUUM Steel Mini 3.5 kW be installed in an outdoor sauna?

The HUUM Steel Mini 3.5 kW can be used in an outdoor sauna as long as the setup includes proper insulation, weather protection, and electrical wiring that meets local safety standards. It’s essential to keep both the heater and its control system shielded from rain, snow, and extreme cold to maintain optimal performance and safety.

What control units are compatible with the HUUM Steel Mini?

The HUUM Steel Mini is compatible with the UKU control system (wall-mounted digital unit) and UKU Wi-Fi control (via mobile app) for remote operation.

Is the HUUM Steel Mini 3.5 kW energy-efficient?

Yes, the HUUM Steel Mini 3.5 kW is built with energy efficiency in mind, featuring a smart design that heats up quickly and uses its generous stone capacity to maintain steady, long-lasting warmth with minimal energy use.

How long does a sauna typically take to reach its ideal temperature?

A sauna usually warms up within 30 to 60 minutes, but this can change based on several conditions, including the room’s dimensions, how well it’s insulated, the kind of heater being used, and the temperature setting you find most comfortable.

Is the HUUM Steel Mini 3.5kw safe to use?

The HUUM Steel Mini 3.5 kW heater is safe to use when installed correctly by a qualified electrician and operated in line with the manufacturer’s guidelines.

Does the HUUM Steel Mini 3.5kw come with a warranty?

The HUUM Steel Mini 3.5 kW comes with a 5-year limited warranty on the heater body (excluding the heating elements).