HUUM Steel Sauna Heaters
HUUM STEEL is a slim, vertical electric sauna heater available as a wall-mounted Mini 4 and as floor-standing 6, 9, and 11 kW models. When sized correctly, STEEL can reach temperatures up to 230°F. Its tall stone column delivers soft, even löyly in compact rooms or next to glazing where footprint matters. 
Sauna Heaters
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HUUM STEEL Mini 3.5 kW 240V Electric Sauna Heater
Original price $1,230.00 - Original price $1,230.00Original price $1,230.00$1,576.00$1,576.00 - $1,576.00Current price $1,576.00HUUM Steel Mini 3.5kW 240V/1PH Electric Sauna Heater The HUUM Steel is a classy and powerful pick for a modern home sauna. With its large stone cap...
View full details106 - 177 ft3 -
HUUM STEEL 6 kW 240V Electric Sauna Heater
Original price $2,033.00 - Original price $2,033.00Original price$2,033.00$2,033.00 - $2,033.00Current price $2,033.00HUUM Steel 6kW 240V/1PH Electric Sauna Heater The HUUM Steel is a classy and powerful pick for a modern home sauna. With its large stone capacity f...
View full details177 - 318 ft3 -
HUUM STEEL 9 kW 240V Electric Sauna Heater
Original price $2,224.00 - Original price $2,224.00Original price$2,224.00$2,224.00 - $2,224.00Current price $2,224.00HUUM Steel 9kW 240V/1PH Electric Sauna Heater The HUUM Steel is a classy and powerful pick for a modern home sauna. With its large stone capacity f...
View full details283 - 460 ft3 -
HUUM STEEL 10.5 kW 240V Electric Sauna Heater
Original price $1,870.00 - Original price $1,870.00Original price $1,870.00$2,391.00$2,391.00 - $2,391.00Current price $2,391.00HUUM Steel 10.5kW 240V/1PH Electric Sauna Heater This HUUM Steel is the largest from the Steel range. The Steel is a classy and powerful pick for a...
View full details354 - 566 ft3
Complete Packages
Includes Everything Required to Operate-
HUUM STEEL Series 6.0kW Sauna Heater Package
Original price $3,895.00 - Original price $5,080.00Original price$3,895.00 - $5,080.00$3,895.00 - $5,080.00Current price $3,895.00Complete HUUM Steel 6kW 240V/1PH Electric Sauna Heater Package The HUUM Steel is a classy and powerful pick for a modern home sauna. With its large...
View full details177 - 318 ft3 -
HUUM STEEL Series 9.0kW Sauna Heater Package
Original price $4,086.00 - Original price $5,271.00Original price$4,086.00 - $5,271.00$4,086.00 - $5,271.00Current price $4,086.00Complete HUUM Steel 9kW 240V/1PH Electric Sauna Heater Package The HUUM Steel is a classy and powerful pick for a modern home sauna. With its large...
View full details283 - 460 ft3 -
HUUM STEEL Series 10.5kW Sauna Heater Package
Original price $4,253.00 - Original price $5,438.00Original price$4,253.00 - $5,438.00$4,253.00 - $5,438.00Current price $4,253.00Complete HUUM Steel 10.5kW 240V/1PH Electric Sauna Heater Package This HUUM Steel is the largest from the Steel range. The Steel is a classy and po...
View full details354 - 566 ft3 -
HUUM STEEL Series Mini 3.5kW Sauna Heater Package
Original price $2,958.00 - Original price $4,143.00Original price$2,958.00 - $4,143.00$2,958.00 - $4,143.00Current price $2,958.00Complete HUUM Steel Mini 3.5kW 240V/1PH Electric Sauna Heater Package The HUUM Steel is a classy and powerful pick for a modern home sauna. With it...
View full details106 - 177 ft3
HUUM STEEL Overview
STEEL brings HUUM’s modern pillar aesthetic to tight spaces. The narrow, upright basket lets you place the heater closer to benches or glazing while maintaining the soft, even steam that a large stone mass provides. Choose STEEL Mini 4 for small rooms that need a wall mount or step up to STEEL 6, 9, and 11 for medium rooms that benefit from a floor-standing tower. 
Control System
All HUUM sauna heaters use the same control system. This control system is called UKU. In all HUUM sauna heaters, there will be an external control panel for controlling the sauna.
HUUM allows the UKU to be installed inside the sauna room, as long as their specific instructions regarding the placement are followed. However, it's more common to install your control panel right outside the sauna, where it doesn't get exposed to heat and humidity.
HUUM offers an additional feature to all UKU controls that allows you to control the sauna remotely through an app on your phone.
Technical Details
HUUM STEEL comes in four configurations across two formats: wall-mounted STEEL Mini 4 and floor-standing STEEL 6, 9, and 11. The slender tower profile stays consistent while higher kW models add element power inside the basket. The bigger your sauna, the greater the kilowatt rating you will need. 
Here are the electrical specs when you wire your STEEL sauna heater with 240 V:
- STEEL Mini 4 kW for sauna rooms sized 124–212 ft³. This model draws 14.58 A, requires a 20 A circuit breaker, and uses 12 AWG wire. 
- STEEL 6 kW for sauna rooms sized 212–353 ft³. This model draws 25 A, requires a 30 A circuit breaker, and uses 10 AWG wire. 
- STEEL 9 kW for sauna rooms sized 318–530 ft³. This model draws 37.5 A, requires a 50 A circuit breaker, and uses 8 AWG wire. 
- STEEL 11 kW for sauna rooms sized 353–600 ft³. This model draws 43.75 A, requires a 50 A circuit breaker, and uses 6 AWG wire. 
Sizing Guidance
- Calculate your room volume in cubic feet.
- Adjust for cold surfaces such as glass, tile, and stone to maintain warm-up speed and steam quality.
- Consider insulation for outdoor cabins.
- If you are between models, choose the larger firebox for faster heat-up and better recovery between water ladling.
Use our Sauna Heater Size Calculator to confirm the right model for your room.
Conclusion
HUUM STEEL is the right choice if you want soft, even löyly from a compact tower with the flexibility to run hotter when you want a more intense session. The vertical stone column gives you stable temperatures and generous steam without taking over your floor plan. Pick STEEL Mini 4 for small rooms that benefit from a wall mount or move to STEEL 6, 9, or 11 for medium rooms that need a floor-standing unit. Pair with UKU Wi-Fi for scheduling, remote starts, and added safety features. 
Have questions about sizing, wiring, or controls? Contact us and our US-based sauna experts will walk you through every step of purchase and installation.