This HUUM Steel Mini sauna heater package comes complete with the traditionally designed STEEL Mini 3.5kW sauna heater, UKU control (WiFi optional), and sauna stones - everything you need to build your dream sauna experience. The package has been combined for use in sauna rooms up to 212 cubic feet (CF).
FEATURES:
STEEL Mini 3.5kW Sauna Heater
- Slender design
- Suitable for use in small saunas with limited space
- Small safety distances
- Heats up to 25% faster due to internal air duct
- For sauna rooms from 123 to 212 cu. ft.
- Works with UKU controls (sold separately)
- 133 pound stone capacity (required 4 boxes sold separately)
- Direct contact between stones and heating elements
- More exposed stones creates a longer and milder heat
- Stainless steel construction
- Stainless steel, industrial quality heating elements
- Wall-mount model
- Designed, engineered, and made in Estonia
- Dimensions: 12.6" W (320mm) x 6" D (150mm) x 38.4" H (975mm)
- Limited 3-year warranty (excluding elements)
UKU
- Sleek Black control display panel
- Multiple Color Options available (additional charges apply)
- Settable on/off, time, temperature, and delay
- Settable temperature range of 104-230F
- Delayed start up to 48hrs in advance
- Optional Built-in Wi-Fi interface for HUUM mobile app (additional charges apply)
- 8 Language options: English, German, Russian, Italian, Finnish, Estonian, Polish and French
- Inside/outside sauna room installation
- Optional smart heating setting
- Available decorative control display panels
- Displays set temperature and room temperature
- Temperature sensor
- Door sensor to keep the heat inside the room
- Remotely located main control module
- Connects to lights and ventilation
- Overheat protection
- Child safety lock
- Control Console Dimensions: 2.2"W (55mm) x 0.9"D (22mm) x 4.1"H (105mm)
- Main Control Module Dimensions: 9 3/4" x 7" x 3"
Stones 12
- Olivine diabase sauna stones
- Rounded shape to complement heater design
- Durable with high-heat capacity
- Stones range from 1" to 2" (3-5 cm)
INCLUDES:
STEEL Mini 3.5kW Sauna Heater
- 3.5kW sauna heater
- Wall fastening bracket
- Installation and operation manual
- 3-Year limited warranty (excluding elements)
UKU
- Black Control console
- Main control module
- Temperature sensor
- Door sensor
- Control display panel cable
- Temperature sensor cable
- Door sensor cable
- Installation and operation manual
- 3-Year limited warranty
Stones 12
- 132 lbs of 1" to 2" (3-5 cm) round Olivine sauna stones
SPECIFICATIONS:
| STEEL Mini 3.5 | |
|---|---|
| Kilowatt Rating | 3.5 KW |
| Minimum Cubic Feet | 123 CF |
| Maximum Cubic Feet | 212 CF |
| Heater Weight | 32 lbs |
| Shipping Weight with Sauna Stones | 165 lbs |
| 240V, Single Phase Amperage | -- |
| Width | 12.6" W (320mm) |
| Depth | 6" D (150mm) |
| Height | 38.4" H (975mm) |
| UKU | |
|---|---|
| Minimum Temperature Setting | 104 F |
| Maximum Temperature Setting | 230 F |
| Shipping Weight | 20 lbs |
| Console Dimensions | |
| Width | 2.2" (55mm) |
| Depth | 0.9" (22mm) |
| Height | 4.1" (105mm) |
| Main Module Dimensions | |
| Width | 3.5" (90mm) |
| Depth | 2.3" (58mm) |
| Height | 5.6" (142mm) |
| Display Panel Cable | |
| Length | 9.8 ft |
| AWG | 22 |
| Temp Sensor Cable | |
| Length | 16.4 ft |
| AWG | 24 |
| Door Sensor Cable | |
| Length | 16.4 ft |
| AWG | 24 |
RESOURCES:
Why a sauna
Modern life doesn't leave much room for recovery.
Decades of research link regular sauna use to measurable improvements in heart health, stress, sleep, and longevity.
63%
lower risk of fatal heart disease among people who sauna 4–7 times a week, versus once.
Laukkanen et al., JAMA Internal Medicine, 2015
61%
lower stroke risk for frequent sauna bathers in a 15-year Finnish cohort.
Kunutsor et al., Neurology, 2018
77%
lower risk of psychotic disorders linked to regular sauna use; benefits also seen for mood.
Psychosomatic Medicine, 2018
No commute necessary
The last thing you want after a long day is a drive to the gym.
Step outside, not out of the house.
Owner reviews
Loved in backyards across the country.
5.0
★★★★★
from 54 verified reviews
Any last questions?
We're here to help.
Can't find what you need? Call or email us anytime.
(512) 299-9993 | info@olisaunas.com
You'll get a confirmation email right away. When your order ships you'll get tracking, and one to two days before delivery our team calls to schedule an appointment.
Lead times vary by model and are listed on each product page. Once it ships, transit is usually 3-7 business days.
Most traditional saunas take about 1-2 full days for two people to assemble. They are designed for DIY assembly and include clear instructions, but they are still a real project and not something you should expect to knock out in an hour or two. Plan on using basic tools like a power drill/driver, level, rubber mallet, and standard hand tools.
Infrared saunas are typically much quicker to assemble, usually taking about 3-4 hours with two people.
If you want us to assemble it for you, we have assembly services available in select areas.
Anything flat, stable, and free of pooling water. A wooden deck, concrete pad, pavers, or gravel all work. We don't recommend setting it directly on turf.
Most 6–9kW heaters run on 240V and need their own dedicated circuit wired by a licensed electrician. The LED lighting runs on standard 120V. We'll walk you through exactly what your chosen heater needs.