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HUUM Steel 4 Mini Series 3.5kW Electric Sauna Heater
by HUUM
Authorized HUUM Dealer
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HUUM Steel 4 Mini 3.5 kW compact electric sauna heater
The Steel 4 Mini is a slim, vertical stainless steel electric heater made in Estonia for small sauna rooms. It is rated at 3.5 kW for steam rooms of 3-5 m3 (about 106-177 cubic feet), holds up to 60 kg (about 132 lb) of stones and works with HUUM's UKU control system, which is sold separately.
Best for: Small home saunas of 106-177 cubic feet where floor space is tight.
Specifications at a glance
- Rated output: 3.5 kW
- Steam room volume: 3-5 m3 (about 106-177 cubic feet)
- Stone capacity: up to 60 kg (about 132 lb), stones 3-5 cm in diameter
- Height: 975 mm (about 38.4 in)
- Width x depth: 310 x 160 mm (about 12.2 x 6.3 in)
- Heater weight: 14.5 kg (about 32 lb)
- Construction: stainless steel enclosure
- Made in: Estonia
- Control: HUUM UKU control system (sold separately)
- Supplied with: heater and adjustable legs
Space, power and setup
Measure your doorways, hallways and sauna room before ordering, and check that your room volume falls inside the heater's listed range. Electrical requirements depend on the heater rating and your supply, so have a licensed electrician confirm voltage, breaker and wire size against the manufacturer's installation manual. Keep the clearances to walls, benches and ceiling that the manual lists. A HUUM electric heater needs the UKU control system, which is sold separately, and sauna stones are bought separately. Local and Wi-Fi UKU options are available through HUUM.
Questions buyers ask
What size sauna is the Steel 4 Mini designed for?
HUUM lists a steam room volume of 3-5 m3, about 106-177 cubic feet. Measure your sauna and call us if you are close to either end of that range.
What electrical setup does it need?
Requirements depend on the 3.5 kW rating and your supply. HUUM lists fuse and cable sizes in its installation manual, and a licensed electrician should confirm the circuit for your location before you order.
What is included, and what do I add?
The set includes the heater and adjustable legs. The UKU control system (local and Wi-Fi options) and sauna stones are sold separately, and the heater holds up to 60 kg (about 132 lb) of stones.
What should I expect from delivery?
Curbside delivery is free within the continental U.S. If you would like the unit brought further in, optional White Glove delivery is available and is priced in the checkout follow-up. Measure your doorways, hallways and sauna room before ordering, and call 1-762-214-2594 with any questions.
Helpful guides
Electric Sauna Heaters | Sauna Heaters | Traditional Saunas
Not sure which size or configuration fits your space? Call 1-762-214-2594 (Mon-Sun 9am-9pm EST) or request a quote, and our product specialists will help you compare options and plan delivery and installation.
Intended for general wellness use, following the manufacturer's instructions. Not intended to diagnose, treat, cure, or prevent any disease or medical condition. Results vary.
- 3.5 kW electric sauna heater
- Designed for steam rooms of 3-5 m3 (about 106-177 cubic feet)
- Holds up to 60 kg (about 132 lb) of 3-5 cm stones
- Slim 310 x 160 mm footprint, 975 mm tall
- Stainless steel enclosure
- Adjustable legs supplied with the set
- Made in Estonia by HUUM
- Works with the HUUM UKU control system (local and Wi-Fi options)
| Brand | HUUM |
|---|---|
| Model | Steel 4 Mini |
| Type | Electric sauna heater |
| Rated output | 3.5 kW |
| Steam room volume | 3-5 m3 (about 106-177 cubic feet) |
| Stone capacity | up to 60 kg (about 132 lb) |
| Stone size | 3-5 cm diameter |
| Height | 975 mm (about 38.4 in) |
| Width | 310 mm (about 12.2 in) |
| Depth | 160 mm (about 6.3 in) |
| Heater weight | 14.5 kg (about 32 lb) |
| Construction | Stainless steel enclosure |
| Made in | Estonia |
| Control | HUUM UKU control system, sold separately |
| Stones | sold separately |
- ## The heater
- STEEL Mini 4 electric sauna heater
- Adjustable legs
- ## Not included
- Optional: HUUM UKU control system
- Optional: Sauna stones (3-5 cm)
- Optional: Heat-resistant power cable
Shipping & Delivery: Most orders ship free within 1-2 business days via curbside delivery. Need it brought inside and set up? Choose White Glove Delivery at checkout and our team will follow up with pricing and scheduling.
Warranty: Warranty coverage varies by manufacturer and product. Contact our team before purchase for the specific warranty terms on this item, or reach out any time after your purchase with a manufacturer defect concern — we'll help you through the process.
Product manuals, installation guides, and spec sheets for this item are available on request. Contact our product specialists and we'll send you the documentation.
Here is what ships with this model. Everything in the checklist is included in the price; anything marked Optional is not included unless you add it.
The heater
- STEEL Mini 4 electric sauna heater
- Adjustable legs
Not included
Optional add-ons (not included)
Not includedAvailable for this model at extra cost. Ask our team to add them to your order.
- HUUM UKU control system
- Sauna stones (3-5 cm)
- Heat-resistant power cable
Not sure which configuration you need? Call 1-762-214-2594 and our team will confirm exactly what arrives with your order.