HUUM STEEL Mini 3.5STU Pkg STEEL Mini Series 3.5kW Sauna Heater Package

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 included 3.5 kW 106 to 177 cu ft Wall-mounted - no floor space used Slender brushed stainless steel profile 2.5" safety clearance from walls 133 lb stone capacity - 4 boxes included Direct stone-to-element contact Integrated air duct - 25% faster heat-up No UKU Extension Box required UKU Local Black or UKU WiFi - select at checkout Single 20A breaker - 12 AWG - 240V 1-phase Lightest electrical requirement in HUUM range SGS Listed - made in Estonia 5-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 Warranty Warranty period 5 years (elements excluded) Design Slim brushed stainless steel - wall-mounted What's included HUUM STEEL Mini 3.5kW wall-mounted sauna heater - brushed stainless steel UKU sauna control (Local Black or WiFi - selected at checkout) Rounded olivine diabase sauna stones - 4 boxes (133 lbs) Wall-mount bracket and hardware Installation and operation manual 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. Manuals and Documents STEEL Installation and Operation Manual STEEL Installation and Operation Manual (PDF) STEEL Elements Required STEEL Elements Required (PDF) UKU Installation and Operation Manual UKU Installation and Operation Manual (PDF) UKU Installation Diagram UKU Installation Diagram (PDF) Extension Installation Manual Extension Installation Manual (PDF) Warranty Warranty Information (PDF) Stone Requirements Stone Requirements (PDF) Warranty 5-year limited warranty (elements excluded) 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.