What is HUUM STEEL Mini?
HUUM STEEL Mini is a wall-mounted heater from HUUM with 4 kW output and 132 lbs stone capacity.
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HUUM STEEL Mini
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HUUM STEEL Mini sauna heater specs and 3D room planner
Use this manual-checked HUUM STEEL Mini product page to compare US and EU power options, adjusted room volume, clearances, UKU controls, rocks, and the shared HUUM 3D body before choosing the correct regional electrical package.
HUUM STEEL Mini is a wall-mounted heater from HUUM for 106-177 cu ft adjusted sauna rooms. Key planning facts: 4 kW output, 132 lbs stone capacity, and 86.6" minimum finished ceiling guidance, controller guidance: HUUM UKU certified controls, and separate US 240V 2~; EU 230V 1/N~ regional electrical rows that share the 3D body only for layout planning.
Design with HUUM STEEL Mini Buy in North America at Sauna Marketplace
Quick answers
What sauna room size fits HUUM STEEL Mini?
The published adjusted room-volume range is 106-177 cu ft. Add glass, tile, stone, brick, concrete, or log exposure before choosing the final kW row.
What clearances does HUUM STEEL Mini need?
Plan 2.00" side/back clearance, 16.1" front clearance, and a 86.6" minimum finished ceiling check before placing benches or glass.
Which controller works with HUUM STEEL Mini?
Current controller guidance: HUUM UKU certified controls. Match the controller, relay or power unit, and voltage to the selected kW row before ordering.
Are US and EU HUUM STEEL Mini heaters the same for 3D planning?
HUUM STEEL Mini uses the same 3D heater body/envelope in SaunaDesignPro for US and EU planning, but the electrical SKUs are separate. Mini 4 uses the same 3D heater body for planning, but the EU electrical row is 230V 1/N~ rather than the US 240V 2~ package. Match the final phase, voltage, breaker, cable, controller, listing, and warranty to the regional manual before ordering.
Where should I start with HUUM STEEL Mini?
Use the 3D designer to validate the room, benches, openings, clearances, and material schedule, then use Sauna Marketplace for the current package and buying path.
HUUM STEEL Mini size and clearance table
| Variant | Power | Room volume | Dimensions | Rocks | Side/back | Front | Minimum ceiling | Controller |
|---|---|---|---|---|---|---|---|---|
| STEEL Mini 4STEEL Mini 4 | 4 kW | 106-177 cu ft | 12.2" W x 6.30" D x 38.4" H | 132 lb | 2.00" | 16.1" | 86.6" | HUUM UKU certified controls |
Best fit
- 4 kW HUUM heater family for 106-177 cu ft adjusted hot rooms.
- Wall-mounted layouts where the heater footprint, front clearance, and bench approach are planned before ordering.
- 132 lbs stone capacity with HUUM UKU certified controls controller guidance.
- Rooms that can meet the 86.6" minimum finished ceiling check for the selected size row.
- Wall blocking, cladding buildup, and heater bottom height should be resolved before paneling goes in.
Designer checks
- Size the room by adjusted volume, including the 3.3 cu ft per sq ft (1 m3 per 1 m2) for uninsulated brick, tile, glass, or similar surfaces rule where it applies.
- Validate side/back clearance 2.00", front clearance 16.1", and bench setback before finalizing benches.
- Check the 86.6" minimum finished ceiling against the room height.
- Carry the selected HUUM UKU certified controls package into the material schedule and heater placement notes.
Package notes
- STEEL Mini wall-bracket heater body
- 132 lb; Recommended Rocks for HUUM STEEL Mini
- Installation and operation manual
- Recommended Rocks for HUUM STEEL Mini
- STEEL Safety Railing
Manual-backed facts
Source
HUUM STEEL Mini US installation and operation manual
source: HUUM STEEL and STEEL Mini Installation and Operation Manual (H1006L03 v9 US manual; PDF saved from HUUM public design resources; checked May 23, 2026)
Mounting
Wall-mounted
Floor clearance shows the minimum bottom height where the manual lists one.
Model numbers
STEEL Mini 4
Useful when the store name and manual model number are not identical.
Room volume range
106-177 cu ft
Use adjusted sauna volume after cold surfaces, not just geometric room volume.
Cold-surface adder
3.3 cu ft per sq ft (1 m3 per 1 m2) for uninsulated brick, tile, glass, or similar surfaces
The calculator applies the brand-family coefficient before selecting a heater size.
Minimum finished ceiling
86.6"
Computed from body height, floor clearance, top clearance, and the manual minimum room height.
Maximum room height
Not listed for these sizes
Verify with the selected manual when designing unusually tall rooms.
Electrical/control
US: 4 kW at 240V 2~, EU: 4 kW at 230V 1/N~; HUUM UKU certified controls
Use the selected kW row and SKU when matching breakers, phases, relays, and controller packages.
Critical differences
Certified control system required Add glass/tile/brick penalty before sizing
8 more notes shown below.
Regional electrical SKUs
US 240V 2~; EU 230V 1/N~
Mini 4 uses the same 3D heater body for planning, but the EU electrical row is 230V 1/N~ rather than the US 240V 2~ package.
3D model basis
Shared HUUM body/envelope for US and EU planning
HUUM STEEL Mini US and EU rows use the same SaunaDesignPro 3D body/envelope for placement. Do not treat that as the same electrical SKU; use the selected regional manual for output, phase, breaker, cable, controller, listing, and warranty.
- Certified control system required
- Add glass/tile/brick penalty before sizing
- US and EU HUUM electrical packages use separate regional specs/listings; share the 3D body model only after confirming the exact market SKU
- Stands on its four legs; anchor the top to the wall with the included wall mounting plate (screws at 835-875 mm)
- Do not install more than one heater in one sauna room
- HUUM publishes UKU Classic and UKU Glass/Mirror/Gold controller 3D resources; SaunaDesignPro places the selected UKU controller outside the hot room in 3D planning.
- CLIFF/STEEL manual Table 3 uses A for the lower/side combustible distance and B for the larger upper/wall safety envelope; SaunaDesignPro uses A for ordinary bench approach/cutouts and keeps B for the published front/upper wall clearance.
- Where a bench or floor recess is intentionally detailed with HUUM's embedding flange, the EU manual shows the bench/floor opening detail and requires at least 21.7 in (550 mm) of heater protruding above the bench/floor surface.
- Mini CLIFF/STEEL models stand on their four legs and are additionally anchored to the wall with the included wall mounting plate (4 screws at 835-875 mm) instead of the floor brackets the larger sizes use; the same one-heater-per-room manual limit applies.
- The power cable enters through the bottom cover (inlet about 55 mm / 2.2 in off the heater centerline per the manual install figure), so plan the wall-side cable rough-in before the heater is anchored.