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HUUM Steel Sauna Heaters

3.5 - 10.5 kW ◆ Free-Standing* ◆ External Control Unit

The HUUM Steel is available in your choice of four powers: 3.5 kW, 6.0 kW, 9.0 kW or 10.5 kW.

Model Model	Power Power	Adj. VolumeAdjusted Sauna Volume This column shows the adjusted sauna volume range for which each sauna heater is rated. "Adjusted sauna volume" is the volume (i.e. Width x Depth x Height) of the interior of the sauna PLUS an adjustment for cold surfaces in the sauna (i.e. glass, tile, stone, etc. — but not including the floor). This adjustment is typically around +20% but can be more (for example, if your sauna has multiple large windows). Want to verify your sauna's adjusted volume? Use this 20-second CALCULATOR to make sure the heater you buy has the correct power (measured in kilowatts, or kW). Adj. Vol.Adjusted Sauna Volume This column shows the adjusted sauna volume range for which each sauna heater is rated. "Adjusted sauna volume" is the volume (i.e. Width x Depth x Height) of the interior of the sauna PLUS an adjustment for cold surfaces in the sauna (i.e. glass, tile, stone, etc. — but not including the floor). This adjustment is typically around +20% but can be more (for example, if your sauna has multiple large windows). Want to verify your sauna's adjusted volume? Use this 20-second CALCULATOR to make sure the heater you buy has the correct power (measured in kilowatts, or kW).	Sauna SizeMaximum Sauna Size This column provides a quick-reference estimate of the maximum sauna capacity (i.e. 3-person sauna, 4-person sauna, etc.) for which each sauna heater is rated. Again, this is only an estimate based on average sauna sizes, layouts & interior cold surfaces. Your sauna may differ. We strongly recommend taking 20 seconds to verify your sauna's adjusted volume (which is much more precise) to make sure the heater you buy has enough power (measured in kilowatts, or kW). Sauna SizeMaximum Sauna Size This column provides a quick-reference estimate of the maximum sauna capacity (i.e. 3-person sauna, 4-person sauna, etc.) for which each sauna heater is rated. Again, this is only an estimate based on average sauna sizes, layouts & interior cold surfaces. Your sauna may differ. We strongly recommend taking 20 seconds to verify your sauna's adjusted volume (which is much more precise) to make sure the heater you buy has enough power (measured in kilowatts, or kW).	Control Unit Controller	Price Price	View Product
Steel Mini 4	3.5 kW	106 - 177 ft³	2-3 people	Any UKU controller	$1,576	Heater view Bundle bundle
Steel 6	6.0 kW	177 - 318 ft³	3-4 people	Any UKU controller	$2,033	Heater view Bundle bundle
Steel 9	9.0 kW	283 - 460 ft³	5-6 people	Any UKU controller	$2,224	Heater view Bundle bundle
Steel 11	10.5 kW	354 - 566 ft³	6-7 people	Any UKU controller	$2,391	Heater view Bundle bundle

* The Steel 6, Steel 9 and Steel 11 are free-standing heaters. The Steel Mini 4 is a "standing wall mount" heater, meaning it sits on the floor but is right up against the wall.

Key Features:

The HUUM Cliff's "big brother"
132 (Mini) or 330 pound stone capacity
Connects to a 240-Volt electric line
Reaches temperatures up to 230° F

Tall, skinny design with an industrial look
Made and designed in Estonia
12.6" W x 6.0" (Mini) or 12.6" D x 38.4" H
Backed by a 3-year warranty

Not sure how much power you need?

Use this calculator to tell us about your sauna, and we’ll tell you how many kilowatts (kW) your heater needs.

Other HUUM Designs

DROP Series

4.5 - 9 kW
wall-mounted
HUUM's most popular heater

CLIFF Series

3.5 - 10.5 kW
free-standing
high stone capacity

HIVE Series

6 - 18 kW
free-standing
can link 2+ HIVEs together