What is HUUM STEEL?
HUUM STEEL is a floor-standing heater from HUUM with 6-11 kW output and 330 lbs stone capacity.
Current heater
HUUM STEEL
Compare electric heaters
HUUM sauna heater specs
HUUM STEEL sauna heater specs and 3D room planner
Use this manual-checked HUUM STEEL 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 is a floor-standing heater from HUUM for 177-566 cu ft adjusted sauna rooms. Key planning facts: 6-11 kW output, 330 lbs stone capacity, and 86.6" minimum finished ceiling guidance, controller guidance: HUUM UKU certified controls, and separate US 240/208V 2~; EU 230V 1/N~ or 400V 3/N~ regional electrical rows that share the 3D body only for layout planning.
Design with HUUM STEEL Buy in North America at Sauna Marketplace
Quick answers
What sauna room size fits HUUM STEEL?
The published adjusted room-volume range is 177-566 cu ft. Add glass, tile, stone, brick, concrete, or log exposure before choosing the final kW row.
What clearances does HUUM STEEL need?
Plan 2.00"-3.94" side/back clearance, 16.5"-20.5" front clearance, and a 86.6" minimum finished ceiling check before placing benches or glass.
Which controller works with HUUM STEEL?
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 heaters the same for 3D planning?
HUUM STEEL uses the same 3D heater body/envelope in SaunaDesignPro for US and EU planning, but the electrical SKUs are separate. Mini 4 uses an EU 230V 1/N~ row; full-size 6, 9, and 11 rows show EU 230V 1/N~ or 400V 3/N~ wiring. The EU 11 rows are 10.5 kW while the US rows list 11 kW. Match the final phase, voltage, breaker, cable, controller, listing, and warranty to the regional manual before ordering.
Where should I start with HUUM STEEL?
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 size and clearance table
| Variant | Power | Room volume | Dimensions | Rocks | Side/back | Front | Minimum ceiling | Controller |
|---|---|---|---|---|---|---|---|---|
| STEEL 6STEEL 6 | 6 kW | 177-318 cu ft | 12.6" W x 12.6" D x 38.4" H | 330 lb | 2.00" | 16.5" | 86.6" | HUUM UKU certified controls |
| STEEL 9STEEL 9 | 9 kW | 283-460 cu ft | 12.6" W x 12.6" D x 38.4" H | 330 lb | 3.94" | 20.5" | 86.6" | HUUM UKU certified controls |
| STEEL 11STEEL 11 | 11 kW | 354-566 cu ft | 12.6" W x 12.6" D x 38.4" H | 330 lb | 3.94" | 20.5" | 86.6" | HUUM UKU certified controls |
Best fit
- 6-11 kW HUUM heater family for 177-566 cu ft adjusted hot rooms.
- Floor-standing layouts where the heater footprint, front clearance, and bench approach are planned before ordering.
- 330 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.
- Floor space, service access, guard rail planning, and cold-surface sizing should be checked with the full room layout.
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"-3.94", front clearance 16.5"-20.5", 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 floor-standing heater body
- 330 lb; Recommended Rocks for HUUM STEEL
- Installation and operation manual
- Recommended Rocks for HUUM STEEL
- STEEL Safety Railing
Manual-backed facts
Source
HUUM STEEL 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
Floor-standing
Floor-standing sizes use their own body height and top clearance.
Model numbers
STEEL 6 / STEEL 9 / STEEL 11
Useful when the store name and manual model number are not identical.
Room volume range
177-566 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: 6 kW at 240V 2~; 208V 2~ derates to 4.8 kW, EU: 6 kW at 230V 1/N~ or 400V 3/N~ (3 x 10A at 400V); HUUM UKU certified controls / US: 9 kW at 240V 2~; 208V 2~ derates to 7.1 kW, EU: 9 kW at 230V 1/N~ or 400V 3/N~ (3 x 16A at 400V); HUUM UKU certified controls / +1 more
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 240/208V 2~; EU 230V 1/N~ or 400V 3/N~
Mini 4 uses an EU 230V 1/N~ row; full-size 6, 9, and 11 rows show EU 230V 1/N~ or 400V 3/N~ wiring. The EU 11 rows are 10.5 kW while the US rows list 11 kW.
3D model basis
Shared HUUM body/envelope for US and EU planning
HUUM STEEL 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
- Floor brackets required
- 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.
- 6/9/11 kW CLIFF and STEEL rows stand on four adjustable legs fixed to the floor with the included brackets (min 6 x 40 mm screws); Mini variants are the wall-bracket rows.
- The full-size body may be partially embedded into a sauna bench or floor using HUUM's embedding flange accessory; at least 21.7 in (550 mm) of the heater must protrude above the bench surface.
- 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.