Rated for a bigger room: Harvia KIP45B 4.5 kW 240VAC
Harvia rates it for 100–211 ft³ (about 2.8–6 m³, our conversion); HUUM rates the STEEL Mini 4 for 3–5 m³ (about 106–177 ft³, our conversion).
HUUM STEEL Mini 4
A electric sauna heater from HUUM, rated by the maker for 3–5 m³ (about 106–177 ft³, our conversion). Every figure below is HUUM's own, linked to where it is published.
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Specifications published by HUUM (10)
- Room size it is rated for
- 3–5 m³ (about 106–177 ft³, our conversion)Electric Sauna Heater STEEL Mini - HUUM
- Fuel
- ElectricElectric Sauna Heater STEEL Mini - HUUM
- Voltage
- 240 V 2~ or 208 V 2~Electric Sauna Heater STEEL Mini - HUUM
- Breaker / current
- 20 A (240 V), 20 A (208 V)Electric Sauna Heater STEEL Mini - HUUM
- Stone capacity
- 60 kgElectric Sauna Heater STEEL Mini - HUUM
- Controls
- The UKU control system set already includes a black plastic control panel CLASSIC BlackElectric Sauna Heater STEEL Mini - HUUM
- Dimensions
- H 975 mm x W 310 mm x D 160 mmElectric Sauna Heater STEEL Mini - HUUM
- Weight
- 14.5 kgElectric Sauna Heater STEEL Mini - HUUM
- Warranty
- 3 years (private use); 1 year (commercial use)HUUM Limited Warranty Terms and Conditions (v4, ENG)
- Made in
- EstoniaElectric Sauna Heater STEEL Mini - HUUM
As published by HUUM, read on 2026-09-23. Makers revise their products; check HUUM's current specification before you buy. Figures marked "about" are Saunakivi's unit conversions of the maker's figure.
Before you buy
- Room size. Our heater sizing guide explains how makers adjust the rated room size for glass and uninsulated walls.
If you are looking for more
A longer stated warranty, on at least part of the product: Finnleo Designer-SL2 6.0 kW
Finnleo states: 5 years parts (traditional sauna heater), residential; 2 years in-field labor + 3 years at-factory labor (non-commercial); commercial: 2-year parts-only. HUUM states for the STEEL Mini 4: 3 years (private use); 1 year (commercial use).
Compare it with
STEEL Mini 4 vs KIP45B 4.5 kW 240VAC
Side by side with the Harvia KIP45B 4.5 kW 240VAC. The makers of both electric heaters publish rated room sizes that overlap.
Other electric heaters
Harvia KIP80B 8 kW 240VAC
Harvia · electric · 8 kW · rated for 251–424 ft³ (about 7.1–12 m³, our conversion)
Harvia KIP45B 4.5 kW 240VAC
Harvia · electric · 4.5 kW · rated for 100–211 ft³ (about 2.8–6 m³, our conversion)
Harvia KIP60W 6.0 kW 240V
Harvia · electric · 6 kW · rated for 170–300 ft³ (about 4.8–8.5 m³, our conversion)
Harvia Cilindro Half PC90H 9 kW 208V
Harvia · electric · 9 kW
HUUM DROP 6
HUUM · electric · 6 kW · rated for 5–9 m³ (about 177–318 ft³, our conversion)
HUUM DROP 9
HUUM · electric · 9 kW · rated for 8–13 m³ (about 283–459 ft³, our conversion)
STEEL Mini 4: questions answered from HUUM's specification
What size of sauna room is the STEEL Mini 4 for?
HUUM rates it for 3–5 m³ (about 106–177 ft³, our conversion). See our heater sizing guide for how makers adjust that figure for glass and uninsulated walls.
What voltage does the STEEL Mini 4 run on?
HUUM lists 240 V 2~ or 208 V 2~. Related question: Does a sauna heater need 240 V, or will 120 V work?
What breaker or current does the STEEL Mini 4 need?
HUUM lists 20 A (240 V), 20 A (208 V). The installation manual and a licensed electrician have the final word. Related question: What breaker does a sauna heater need?
How many stones does the STEEL Mini 4 hold?
HUUM lists a stone capacity of 60 kg.
How is the STEEL Mini 4 controlled?
HUUM lists: The UKU control system set already includes a black plastic control panel CLASSIC Black.
What warranty does HUUM give on the STEEL Mini 4?
HUUM lists: 3 years (private use); 1 year (commercial use).
Source: HUUM Limited Warranty Terms and Conditions (v4, ENG)
More from HUUM: all HUUM products on Saunakivi.