The HUUM STEEL Mini 4STU Pkg is a HUUM electric sauna heater made in Estonia, 3.5 kW, about 106–177 cu ft. STEEL Mini is the slim wall version of STEEL.
How it heats
Electric elements inside a stone cage. You need a HUUM UKU (or compatible) control — there are no dials on the heater. Round stones are what HUUM recommends. Licensed electrician, heat-resistant cable, no guessed breaker size from us. Glass and masonry: add equivalent volume when you size kW.
What’s included
HUUM STEEL Mini 4STU heater
STU/STUX package options on this listing name UKU Local or UKU Wi-Fi in black or wood — that control is part of the package choice.
STU is the dealer package code for heater + stones + UKU. Confirm today’s packing list with our team if you need it in writing.
Specs
Brand: HUUM (Estonia)
Output: 3.5 kW
Approx. room volume: 106–177 cu ft
Mount: Wall (mounting plate in the Mini kit)
Control: UKU (sold separately unless this is a UKU package)
Stone load (manufacturer): about 132 lb / 60 kg, 1.2–2 in (STEEL Mini)
Match heater kW to insulated interior volume. Glass, stone, tile, or thin walls need more heater than a tight wood room of the same size. A licensed electrician completes the hookup from the nameplate — we do not guess breaker size. Email hello@selfcaresaunas.com to size the room first.
FAQ
Are stones included? Heater-only SKUs: no. STU packages: stones are part of the STU name; still confirm the carton with our team.
Is UKU included? Heater-only: no. Packages whose options list UKU Local / UKU Wi-Fi: yes, that control finish is the option you pick.
240V? HUUM US heaters are typically 240V hardwired. Electrician uses the HUUM table in the manual. We do not invent amps.
Wall or floor? Wall (mounting plate in the Mini kit)
