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Description
The Huum STEEL Mini 4 is a 3.5kW wall-mounted electric sauna heater for compact home saunas of about 106 to 177 cu ft. Its slim stainless steel body and short safety distances suit the smallest steam rooms. This package includes the Huum UKU control and sauna stones.
Heat and stones
Huum rates the STEEL Mini to hold 60 kg (132 lb) of stones in direct contact with the heating elements. Huum says its internal air tunnel speeds up heating by about 25% and extends heating element life.
Design
The slim, wall-mounted stainless steel enclosure contrasts with the natural stones. The UKU control sets temperature, timer and delayed start. Made in Estonia.
Specifications (Huum)
- Model: STEEL Mini 4, part number H1007012
- Output: 3.5kW
- Room volume: 106 to 177 cu ft (3 to 5 cubic meters)
- Supply: 240V, 20 A breaker, 12 AWG power cable
- Stone capacity: 60 kg (132 lb), stones 3 to 5 cm (1.2 to 2 in)
- Heater weight: 14.5 kg (32 lb)
- Size: 38.4 in high, 12.2 in wide, 6.3 in deep (975 x 310 x 160 mm)
- Mounting: Wall mounted
- Material: Stainless steel
- Control: Huum UKU control
- Made in: Estonia
What you need to know before buying
- Hardwired 240V heater: a licensed electrician must install it and the controller, with the breaker and wire sizes in the Huum manual (20 A breaker, 12 AWG).
- Huum lists a heat-resistant power cable as an additional need; it is not part of this package.
- Keep the safety distances and minimum ceiling height shown in the Huum user manual. Huum strongly recommends a safety railing around the heater (sold separately).
- Check your room volume against the output range before you order; our heater size calculator can help.
In the box
Huum STEEL Mini 4 heater, Huum UKU control and sauna stones, per the supplier package. Huum specifies 60 kg of 3 to 5 cm stones; contact us to confirm the stone quantity before ordering.
Compare
Huum STEEL 6 to 11kW is the larger floor-standing STEEL for bigger rooms, Huum Drop wall-mount electric heater is another wall-mounted Huum heater.
Warranty
30-day limited warranty against manufacturing defects. Huum heaters are made in Estonia.
Returns
Returns are accepted within 30 days of delivery for unused, unopened items in the original packaging, with our written approval first. A 25% restocking fee applies, you pay return shipping, and original shipping is non-refundable. Note any shipping damage on the delivery receipt and send us photos right away.
Why buy from Restore Suite
Financing is available at checkout. Questions before you buy? Talk to a real person.
Related
Electric sauna heaters, Sauna heater controls, Sauna heater size calculator, Sauna breaker size calculator.
Sauna use is intended for general relaxation and wellness, not to treat any condition. If you are pregnant, have a heart condition, low blood pressure or another health concern, talk with your doctor before use. Follow the manufacturer's installation clearances and electrical requirements.
Specifications
| Model | STEEL Mini 4, part number H1007012 |
|---|---|
| Output | 3.5kW |
| Room volume | 106 to 177 cu ft (3 to 5 cubic meters) |
| Supply | 240V, 20 A breaker, 12 AWG power cable |
| Stone capacity | 60 kg (132 lb), stones 3 to 5 cm (1.2 to 2 in) |
| Heater weight | 14.5 kg (32 lb) |
| Size | 38.4 in high, 12.2 in wide, 6.3 in deep (975 x 310 x 160 mm) |
| Mounting | Wall mounted |
| Material | Stainless steel |
| Control | Huum UKU control |
| Made in | Estonia |
Specifications from the manufacturer. Dimensions are approximate.
Shipping
We ship to the 48 contiguous U.S. states and Washington, DC. Your shipping cost is calculated at checkout and shown before you pay.
You will get an order confirmation right away and tracking by email when your order ships. Questions about timing for a specific item? Call (945) 280-3243 or email support@restoresuite.com before you order.
Delivery
Large items such as saunas, hot tubs and cold plunge tubs usually ship by freight. The carrier contacts you to schedule delivery. Please check the packaging and note any damage on the delivery receipt before you sign, then tell us within 48 hours so we can resolve it for you.
Before delivery day, measure doorways and hallways along the path to the install spot, and confirm the electrical requirement on the Specifications tab.
Warranty
30-day limited warranty against manufacturing defects
If this item has a manufacturing defect within 30 days of purchase, contact us with your order number and a photo or video of the issue and we will make it right.
Reviews
What delivery looks like
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Learn more from Huum
Manuals and documents
Official Huum documents for this model. Opens as a PDF.
Why this heater
A slim 3.5kW wall-mounted Estonian heater for 106 to 177 cu ft saunas, with UKU control and stones.
- 3.5kW for compact saunas of 106 to 177 cu ft.
- Holds 60 kg (132 lb) of stones, rated by Huum.
- Wall mounted, 6.3 in deep, stainless steel.
- Runs on a 240V, 20 A circuit, per Huum.
Key specs at a glance
The numbers to check before you order. Full details are on the Specifications tab.
- Stone capacity
- 60 kg (132 lb), stones 3 to 5 cm (1.2 to 2 in)
- Heater weight
- 14.5 kg (32 lb)
- Size
- 38.4 in high, 12.2 in wide, 6.3 in deep (975 x 310 x 160 mm)
Before you buy: what to know
Based on the manufacturer's specs, manuals and our research.
- The STEEL Mini 4 is sized for 106 to 177 cu ft. For a larger room, look at the STEEL in 6 to 11kW.
- It needs a 240V, 20 A circuit with 12 AWG cable per Huum, installed by a licensed electrician.
Not sure this is the right fit? Ask us or call (945) 280-3243.
Compare Huum models
Swipe to compare 4 models
| Model |
 Huum Drop Wall Mount Sauna Heater with UKU Controller & Stones
From $2,716.00 |
 Huum Hive Flow Mini 8.5kW Wood-Burning Sauna Stove with Ash Drawer & Sauna Stones
$3,339.00 |
 Huum Hive Flow Mini LS 8.5kW Wood-Burning Sauna Stove with Firebox Extension & Sauna Stones
$3,463.00 |
 Huum Hive Flow LS 9.8kW Wood-Burning Sauna Stove with Firebox Extension & Sauna Stones
$3,955.00 |
|---|---|---|---|---|
| Stone capacity | 122 lb | – | 231 lb | 330 lb |
Huum Drop Wall Mount Sauna Heater with UKU Controller & StonesFrom $2,716.00
- Stone capacity
- 122 lb
Huum Hive Flow Mini 8.5kW Wood-Burning Sauna Stove with Ash Drawer & Sauna Stones$3,339.00
Common questions
What size sauna is it for?
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Choosing the right setup can be tricky. We are here to help.
Tell us your space, power and how you plan to use it, and we will help you compare models honestly, including whether this one is the right fit.
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Honest guidance
Free guides and calculators for sizing, running costs and safety, so you can decide with real numbers. See the research
