HUUM STEEL Mini Electric Sauna Heater 3.5kW
The compact HUUM STEEL Mini is a 3.5 kW electric sauna heater with exceptionally short safety distances, made for modest sauna rooms from 123 to 212 cu. ft. It stands on the floor and fastens to the wall with its bracket, so it takes up very little space, and an internal air duct heats the room up to 25% faster. Model STEEL Mini 4, order no. H1007012.
The heater does not run on its own: it requires a HUUM UKU control and sauna stones, both sold separately. See What to Order With It below.
Package Contents
- HUUM STEEL Mini sauna heater
- Wall fastening bracket
- Installation and operation manual
Key Features
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Model / Order #: STEEL Mini 4 / H1007012
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Slender Design: Only 6 in (150 mm) deep; suited to small saunas with limited space.
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Small Safety Distances: 2 in (50 mm) to the side walls.
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Faster Heat-Up: Heats up to 25% faster due to the internal air duct.
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3.5 kW: For sauna rooms from 123 to 212 cu. ft.
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240V / 1-Phase: Hardwired 240V single-phase operation. Can also run on 208V single-phase at reduced output.
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133 lb Stone Capacity: Requires 4 boxes of stones, sold separately.
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Direct Stone Contact: Direct contact between the stones and heating elements; more exposed stones create a longer and milder heat.
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Stainless Steel: Stainless steel construction with stainless steel, industrial-quality heating elements.
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Wall-Mount Model: Stands on the floor and is attached to the wall with a bracket.
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Control: Works with HUUM UKU controls, sold separately.
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Origin: Designed, engineered and made in Estonia.
What to Order With It
The heater ships without a control or stones. Both are required for operation.
Required (choose one UKU control):
Required (sauna stones, order 4 boxes):
Specifications
| Model |
STEEL Mini 4 |
| Order number |
H1007012 |
| UPC |
4745090270235 |
| Output at 240V |
3.5 kW |
| Sauna room size at 240V |
123-212 cu. ft. |
| Current at 240V |
14.58 A |
| Circuit breaker at 240V |
15 A |
| Wire size at 240V |
14 AWG |
| Output at 208V |
2.6 kW |
| Sauna room size at 208V |
106-160 cu. ft. |
| Current at 208V |
12.5 A |
| Circuit breaker at 208V |
15 A |
| Wire size at 208V |
14 AWG |
| Heater weight (empty) |
32 lbs. |
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Heater Type: Electric sauna heater, standing wall-mount inside the sauna room
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Electrical Service: 240V, 1-phase, hardwired (208V, 1-phase at the reduced outputs shown above). Must be connected by a licensed electrician.
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Control: HUUM UKU control required, sold separately
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Stone Capacity: 133 lbs.
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Stone Size: 1.2-1.9 in (3-5 cm)
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Maximum Temperature Setting: 230 F (110 C)
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Construction: Stainless steel, brushed stainless steel finish
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High Temperature Limit: At the sensor
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Listing: SGS listed, CE, IPX4
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Location: Indoor sauna room use
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Delivery: Ships by LTL freight.
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Warranty: 3-year limited residential, 1-year limited commercial, excluding heating elements
Dimensions & Weight
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Heater Dimensions (W x D x H): 12.6" x 6" x 38.4" (320 x 150 x 975 mm)
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Heater Weight (empty): 32 lbs.
Installation Requirements
Minimum safety clearances (letters refer to the diagram below):
| Model |
STEEL Mini 4 |
| A: heater to side walls |
2 in (50 mm) |
| B: clear width |
16.5 in (420 mm) |
| H: heater height |
38.4 in (975 mm) |
| Top of heater to ceiling |
47.3 in (1200 mm) |
| Wall bracket height from the floor |
34.4 in (875 mm) |
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Fastening: The STEEL Mini is attached to the wall with its bracket, fixed with four 6 x 40 mm screws. Plan blocking behind the paneling before the wall is closed up.
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Power connection: The power cable enters through the bottom of the heater.
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Stones: Use 1.2-1.9 in (3-5 cm) stones. Stack them sparsely between the heating elements and tightly on the outside so the elements are not visible. A stone container filled too sparsely is a fire hazard.
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Surface temperature: Installing the heater closer to flammable construction than the clearances above may cause a fire hazard.
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Wiring: Use heat-resistant power cable that meets UL 62; cable with PVC insulation is not allowed. A circuit breaker that disconnects all poles must be installed on the power circuit ahead of the sauna control. HUUM recommends connecting the heater without a GFCI breaker. Breaker and wire sizes above are from the installation manual; your electrician sizes the circuit to local code.
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Junction box: Must be waterproof and located no more than 19.7 in (50 cm) from the floor.
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Uninsulated walls: For any uninsulated brick, tile or glass wall, add 3.3 cu. ft. to the room volume for each 1 sq. ft. of that wall before choosing a size.
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One heater per room: Do not install more than one heater in the sauna room.
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Installation: Electrical work must be carried out by a licensed electrician, following the installation manual and local codes.
Documents
Installation & Operation Manual (STEEL Mini 3.5 and STEEL 6 / 9 / 10.5)
Warranty
3-Year Limited Residential Warranty, 1-Year Limited Commercial Warranty: HUUM covers the STEEL Mini with a 3-year limited warranty in residential use and a 1-year limited warranty in commercial use. Heating elements are not covered; they are treated as consumable parts. The warranty applies only when the heater is installed and used according to the manual, and it is void if the heater and sauna room are sized incorrectly.
