The HUUM Steel Mini 3.5 kW comes as a bare heater or a package with a UKU control and stones. This wall-mounted sauna heater suits rooms from 123 to 212 cubic feet. Its slim design is only 6 inches deep, so you can hang it in a small sauna with limited floor space. Choose the package if you need the heater, control and stones together.


Meet the HUUM Steel Mini

This electric sauna heater is the wall mounted 3.5 kW version of the Steel, made in Estonia. It measures about 12.6 inches wide and 6 inches deep. An internal air duct helps it heat up to 25 percent faster, with 133 pounds of sauna stones sitting directly on the heating elements. Browse the HUUM range or compare our electric heaters.

A wall heater for a closet sized sauna

The Steel Mini suits sauna rooms from 123 to 212 cubic feet, and its small safety distances let it hang close to the wall. For a bigger room, look at the floor standing Steel. The ribbed Cliff Mini suits the same room range, with front ribs that lift off. For another wall heater, the Drop range covers 106 to 530 cubic feet.

The UKU, stones and package

The Steel Mini 3.5 bare heater listing comes with the wall bracket and manual. You add a HUUM UKU control and four boxes of stones on the page. The Steel Mini 3.5 package listing includes the control, sensors, cables and 132 pounds of rounded olivine stones. Choose standard UKU, Wi-Fi, Mirror or Gold, with the UKU as the sauna controller, mounted outside the hot room. The Wi-Fi version lets you start the sauna from your phone with the HUUM mobile app.

Why buy from My Cozy Outdoors?

We are an authorized HUUM dealer. Every listing carries the full manufacturer warranty. Call us and we will talk it through, from your room size to the heater and control.

Your questions answered

What is the smallest HUUM sauna heater?

The Steel Mini is the smallest by depth, at only 6 inches. It is about 12.6 inches wide and 38 inches tall. This 3.5 kW wall heater suits 123 to 212 cubic feet and holds 133 pounds of stones.

How hot does a HUUM Steel Mini get?

The UKU control sets temperatures from 104 to 230 degrees. Users report a converted walk-in shower sauna reaching 230 degrees, with plenty of steam from 133 pounds of stones. A Wi-Fi UKU lets you set the temperature from your phone.

HUUM Steel Mini or HUUM Cliff Mini?

Both are 3.5 kW wall heaters for 123 to 212 cubic feet, with an air duct and 133 pounds of stones. The plain sided Steel Mini is wider and slightly shallower. The Cliff Mini has lift-off front ribs, so your choice comes down to the look.

Does the HUUM Steel Mini come with a control and stones?

The bare heater includes its bracket and manual, with a HUUM UKU control and four boxes of stones added on the page. The package includes the control, sensors, cables and 132 pounds of rounded olivine stones. Choose either listing for your HUUM Steel Mini.