HUUM STEEL Mini 3.5STU Pkg STEEL Mini Series 3.5kW Sauna Heater Package
The HUUM STEEL Mini 3.5STU Package is a complete sauna heater package for small sauna rooms from 106 to 177 cubic feet, including the STEEL Mini 3.5kW heater, UKU sauna control (Local Black or WiFi - selected at checkout), and 133 lbs of rounded olivine diabase sauna stones. The STEEL Mini is the wall-mounted member of the STEEL family - an important distinction from the floor-standing STEEL 6, 9, and 10.5kW models. While the full STEEL series stands on the sauna floor on adjustable legs, the STEEL Mini mounts on the sauna wall with a bracket, taking no floor space at all. At 3.5kW on a standard 20A / 12 AWG circuit, it is designed specifically for the smallest sauna rooms - personal home saunas, single-bench rooms, compact barrel saunas, and tight custom builds where a 30A or 50A circuit is impractical and floor space is the limiting constraint.
Wall-mounted - the STEEL aesthetic in a compact wall-bracket format
The STEEL Mini brings the slender stainless steel profile and minimal safety clearance engineering of the STEEL family to a wall-mounted format suited for rooms from 106 to 177 cubic feet. Like the full STEEL models, the STEEL Mini has a slim rectangular brushed stainless steel profile, an integrated internal air duct for 25% faster heat-up, and direct stone-to-element contact for efficient heat transfer. The safety clearance from surrounding walls is 2.5" (5 cm) - even tighter than the STEEL 6's 2" clearance for a floor-standing unit, making the STEEL Mini one of the most space-efficient wall-mounted electric sauna heaters available at this output level. In a 106-177 cu ft sauna room where every inch of bench and floor space matters, the wall-mounted installation keeps the floor completely clear for the bather.
133 lbs of stone on a 20A circuit - generous stone mass for a small room heater
Despite its compact wall-mounted form for small rooms, the STEEL Mini carries 133 lbs of rounded olivine diabase stones - substantially more than a standard wall-mounted heater in this output class. For comparison, the HUUM DROP 4.5kW (the closest DROP model for this room range) carries 122 lbs on a 30A / 10 AWG circuit; the STEEL Mini carries 133 lbs on a lighter 20A / 12 AWG circuit. The additional stone mass, combined with direct stone-to-element contact, produces softer and longer-lasting steam from a heater that runs on a standard 20A circuit - the lightest electrical requirement of any HUUM heater. For new sauna installations in homes where panel capacity is limited, the STEEL Mini's 20A requirement makes it the most electrically accessible floor-heating HUUM option.
20A / 12 AWG - the lightest electrical requirement in the HUUM range
The STEEL Mini 3.5kW requires a single 20A two-pole breaker and 12 AWG wire - lighter than any other HUUM heater in the range. The DROP 4.5kW and 6kW, the HIVE Mini 6kW, and the STEEL 6kW all require a minimum 30A circuit; the STEEL Mini is the one HUUM heater that can run on a 20A circuit, making it the correct choice when panel capacity is the binding constraint for a small sauna room. A licensed electrician is required for all connections. Do not connect to a GFI/GFCI breaker. No UKU Extension Box is required for the 3.5kW output level.
Complete 3.5kW wall-mounted sauna heater package for small rooms from 106 to 177 cubic feet. Includes STEEL Mini 3.5kW heater, UKU control (Local Black or WiFi - select at checkout), and 133 lbs of rounded olivine diabase stones (4 boxes). Wall-mounted - no floor space used. Slender brushed stainless steel profile. 2.5" safety clearance from walls. 133 lbs stone capacity - generous for a small-room wall-mounted heater. Direct stone-to-element contact. Integrated air duct - 25% faster heat-up. No UKU Extension Box required. Single 20A breaker, 12 AWG wire - lightest electrical requirement in the HUUM range. 240V / 1-phase. Max 230°F. SGS Listed. 5-year warranty (elements excluded). Made in Estonia by HUUM.
Complete package - control + 133 lbs stones included3.5 kW106 to 177 cu ftWall-mounted - no floor space usedSlender brushed stainless steel profile2.5" safety clearance from walls133 lb stone capacity - 4 boxes includedDirect stone-to-element contactIntegrated air duct - 25% faster heat-upNo UKU Extension Box requiredUKU Local Black or UKU WiFi - select at checkoutSingle 20A breaker - 12 AWG - 240V 1-phaseLightest electrical requirement in HUUM rangeSGS Listed - made in Estonia5-year warranty (elements excluded)
Specifications
Electrical
Power output
3.5 kW
Voltage
240V / 1-phase / 60 Hz
Amperage draw
14.58 A
Circuit breaker required
Single 20A (standard 2-pole - no GFI/GFCI)
Wire gauge
12 AWG
UKU Extension Box required
No - not required for 3.5kW
Certification
SGS Listed
Room sizing and stones
Room volume
106 to 177 cu ft
Stone capacity
133 lbs (4 boxes)
Stones included
Yes - 4 boxes rounded olivine diabase
Stone size
2" to 4" (5-10 cm) rounded
Max temperature
230°F (110°C)
Physical and clearances
Profile
Slim rectangular stainless steel - wall-mounted
Safety clearance from walls
2.5" (5 cm)
Mounting
Wall-mounted with bracket
Air duct
Integrated internal - 25% faster heat-up
Stone contact
Direct stone-to-element contact
Construction
Brushed stainless steel
Origin
Made in Estonia by HUUM
Control options - select at checkout
UKU Local Black
Wall-mounted digital control - on-site operation
UKU WiFi
Adds HUUM app remote preheat and scheduling
App
HUUM app - iOS and Android (WiFi variant)
UKU Extension Box
Not required for 3.5kW
STEEL Mini vs STEEL 6 - key differences
STEEL Mini 3.5kW (this listing)
Wall-mounted | 106-177 cu ft | 20A / 12 AWG | 133 lbs
STEEL 6kW
Floor-standing | 177-318 cu ft | 30A / 10 AWG | 330 lbs
Mounting type
Wall bracket vs adjustable floor legs
Circuit
20A (Mini) vs 30A (STEEL 6) - lightest in HUUM range
Optional accessories (sold separately): HUUM STEEL Mini safety railing (recommended), reflector panels (reduce wall clearances further). A licensed electrician is required for all electrical connections.
Why the HUUM STEEL Mini 3.5STU Package stands out
Wall-mounted - zero floor space
The STEEL Mini mounts on the sauna wall with a bracket, keeping the entire floor area free for the bather. In small sauna rooms from 106-177 cu ft - a single-bench personal sauna or compact two-person room - every square foot of floor and bench space matters. The wall-mounted installation eliminates the heater footprint from the floor entirely, which is not possible with any floor-standing HUUM model.
2.5" from the wall - smallest clearance in the STEEL series
The STEEL Mini requires only 2.5" (5 cm) safety clearance from surrounding walls - the smallest wall clearance of any HUUM heater. In compact sauna rooms where the distance from the ideal heater position to the nearest wall or bench is severely constrained, the STEEL Mini can be positioned where no other heater can fit without violating safety distances.
20A / 12 AWG - lightest electrical requirement in the HUUM range
The STEEL Mini 3.5kW requires a 20A two-pole breaker and 12 AWG wire - lighter than every other HUUM heater. The DROP 4.5, DROP 6, HIVE Mini 6, and STEEL 6 all require at minimum 30A / 10 AWG. For small sauna rooms in homes where the panel has limited capacity, the STEEL Mini's 20A requirement is the most electrically accessible path to a complete HUUM installation.
133 lbs of stone - generous for a small-room wall-mounted heater
Despite its compact wall-mounted format for rooms as small as 106 cu ft, the STEEL Mini carries 133 lbs of rounded olivine diabase stones - more than the 122 lbs in the DROP 4.5kW on a heavier 30A circuit. Direct stone-to-element contact ensures efficient heat transfer through the full stone load, producing soft, consistent steam when water is ladled.
Integrated air duct - 25% faster heat-up
The integrated internal air duct reduces heat-up time by approximately 25% and extends element life by directing airflow efficiently through the stone mass. For a 106-177 cu ft room at 3.5kW, the shorter heat-up time means less waiting between switch-on and bathing temperature - a meaningful quality-of-life improvement for regular sauna users.
UKU WiFi - remote preheat for a compact sauna
Upgrading to UKU WiFi at checkout adds HUUM app control on iOS and Android - remote preheat from anywhere, session scheduling, and temperature monitoring. A 106-177 cu ft room at 3.5kW heats up in 15-25 minutes; the WiFi option allows starting the preheat from anywhere so the sauna is ready when the bather arrives. No extension box required for the WiFi upgrade.
About HUUM
Made in Estonia - SGS Listed
HUUM STEEL Mini 3.5STU. 3.5kW. 106-177 cu ft. Wall-mounted. 133 lbs of stone. 20A circuit.
HUUM is an Estonian sauna heater company. The STEEL Mini is the wall-mounted entry point of the STEEL series - the same slim stainless steel profile and minimal clearance engineering as the floor-standing STEEL models, in a compact wall-bracket format for rooms from 106 to 177 cubic feet on a 20A / 12 AWG circuit. The STEEL Mini 3.5STU Package includes the heater, the UKU control (Local Black or WiFi at checkout), and 4 boxes of rounded olivine diabase stones (133 lbs). No UKU Extension Box required. No floor space used. 2.5" from the wall. We are an authorized HUUM dealer.
Complete package - STEEL Mini 3.5kW, UKU control, and 133 lbs rounded olivine stones
3.5kW, 106-177 cu ft - single 20A / 12 AWG, 240V/1PH
Wall-mounted - zero floor space, 2.5" from walls
Lightest electrical requirement in the HUUM range
No UKU Extension Box required - 5-year warranty (elements excluded)
STEEL Mini vs STEEL 6 vs DROP 4.5 - choosing for small rooms
Small sauna room options - STEEL Mini 3.5, DROP 4.5, and STEEL 6
For sauna rooms from 106-177 cu ft, the STEEL Mini 3.5kW is the specific HUUM choice: wall-mounted, 20A circuit, 133 lbs stones, 2.5" clearance. For rooms from 106-248 cu ft where a 30A circuit is available and wall-mounted is preferred, the DROP 4.5kW offers 122 lbs stones in a water-droplet form. For rooms from 177-318 cu ft where floor-standing is preferred and 30A is available, the STEEL 6kW floor-standing offers 330 lbs stones in the same stainless tower aesthetic as the STEEL Mini. The STEEL Mini is the correct choice specifically when the room is 177 cu ft or smaller, a 20A circuit is preferred or required, and a wall-mounted installation is wanted - no other HUUM heater satisfies all three simultaneously. A licensed electrician is required. No GFI/GFCI. STEEL Mini safety railing recommended.
The HUUM STEEL Mini 3.5STU Package is covered by HUUM's 5-year limited warranty from the date of purchase. The warranty covers defects in manufacturing and materials under normal use conditions. Heating elements are excluded from the 5-year coverage and carry their own separate warranty period. The warranty does not cover damage caused by improper installation, use of incorrect or non-approved stones, operating the heater without the required stone load, or failure to follow HUUM's installation and operating guidelines. A licensed electrician is required for all electrical connections. Do not connect to a GFI/GFCI breaker. Proof of purchase from an authorized HUUM dealer is required. We are an authorized HUUM dealer.
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If, within 14 days of your purchase, you discover another online store offering a lower price for the same product, please bring it to our attention. We will promptly contact the brand to ensure they comply with the minimum advertised price policy. If you qualify for a refund, we will credit the price difference back to your credit card.
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Email us at support@mediriser.com with links to the product on both our website and the other dealer's website where you found the price difference.
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We will process the credit accordingly and ensure that you receive the best deal possible.
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