HUUM STEEL Mini 4 4kW Electric Sauna Heater
HUUM STEEL Mini 4 4kW Electric Sauna Heater
- Regular price
- $1,576.00
- Regular price
- Sale price
- $1,576.00
- Unit price
- per
Found it lower? We'll match it, before or after you buy.
Send us a link to the lower price. If it is the same model, new and in stock at an authorized U.S. online retailer, we match it. Already ordered? If it was lower on your order date, claim the difference within 30 days.
Excludes sale pricing, marketplace sellers and later price drops.
Read the full price match terms →A stainless wall heater needing just 2 inches beside it.
- Rated for rooms of 106 to 177 cubic feet
- 12.2″ wide, 38.4″ tall, 32 lbs before stone
- 240V hardwired, licensed electrician required
Width × height of each glass or tile surface, added together. A 2 × 6.5 ft glass door is 13 sq ft.
Measure the inside of the room, in feet. For a barrel sauna or a sauna kit, go with the heater size the sauna’s manufacturer recommends.
Room volume is length x width x height in feet.
Couldn't load pickup availability
How does delivery work?
How does delivery work?
Ships from Wheeling, Illinois. Free to the contiguous 48 above our free shipping threshold. A small accessory can fall below it and then a flat charge applies, shown at checkout before you pay.
How it arrives. The DROP comes by ground parcel, with no appointment and nobody home. CLIFF, STEEL, HIVE and CORE come palletized by freight, including the wall mounted Mini models: the carrier calls to book a window, someone has to sign, and it is a curbside drop rather than inside.
Stone ships in its own boxes. A heater takes 3 to 16 boxes at 33 pounds each. Stone added from a HUUM heater's own page ships free with that heater; ordered on its own it is charged per box at checkout. The quantity is set by the heater, not the room.
When it ships. The estimate on each product page is the distributor's usual dispatch time for stocked items. Stock moves, so we confirm the current position when you order. Working to a deadline? Ask us first.
If it arrives damaged. Note it on the delivery paperwork, photograph the carton and the contents, and tell us the same day. Report damage within 48 hours of delivery, with photographs and before the heater is installed: that is our window, and because it is shorter than HUUM's 7 days it is the one that applies to the HUUM warranty too. Refuse a carton or pallet that is punctured, crushed or structurally damaged.
Where we ship. The contiguous 48 states. We do not ship HUUM to Alaska, Hawaii or Puerto Rico.
Not included: the electrical work. A HUUM heater is hardwired by a licensed electrician, and the clearances and cable entry are set by the model, so book the electrician for after the heater arrives.
What does the warranty cover?
What does the warranty cover?
Private use. 3 years on electric heaters, wood stoves and controls, and 1 year on spare parts, running from your purchase date. Keep the receipt and your electrician's invoice.
Commercial use. 1 year on all of them. HUUM treats it as commercial if a business uses the product commercially, if a private owner uses it commercially, or if a private owner runs it more than 1,500 hours in any 12 months, so a gym, studio or rental is commercial from day one.
What is covered. Defects in materials and workmanship. HUUM decides whether to repair, replace, refund or, with your agreement, reduce the price, and it arranges and pays for any transport it needs. A replaced part does not restart the clock.
Excluded, the ones that matter most. Heating elements, all sensors, sauna stones, accessories, and a wood stove's door glass and ash grate. Also normal wear, damage from poor ventilation or constant damp, power surges and overheating, non-HUUM parts fitted without written approval, and a heater that was the wrong size for the room. Until it is installed it must be kept indoors, dry, ventilated and above freezing.
Two conditions decide most claims. The heater must be installed and connected by a licensed electrician, to HUUM's manual and your local codes, and HUUM can ask for proof. Damage found on delivery must be reported to us within 48 hours and claimed with photographs before the product is installed. Any other fault: report it within 30 days of finding it.
If the fault turns out not to be covered. HUUM's terms let it charge for the work of diagnosing it. We will tell you as soon as HUUM tells us.
Who handles it. HUUM OU in Estonia is the warrantor and we file the claim for you, so you deal with us rather than with Estonia. Call (888) 500-5675 with your order number, the model and its serial number and photographs.
What if I need to return it?
What if I need to return it?
30 days from purchase. New, uninstalled and resalable, in the original packaging with all parts. A heater that has been wired in, fired or loaded with stones counts as installed and cannot go back, and so does a control that has been wired in.
What it costs. Full credit for the product, less a repackaging fee of 20 to 50 dollars depending on the item. There is no percentage restocking fee on a standard return.
Who pays the freight. You do on a change of mind. We cover it when the cause is shipping damage or our error. Shipping you paid at checkout is not refunded on a change of mind return.
Damaged on arrival. A different and faster process. Note it on the delivery receipt before signing, photograph the carton and contents, and call us the same day. Report it within 48 hours of delivery, with photographs and before the product is installed.
Stones and spare parts. Stone is sold by weight and is not returnable once a box is opened. Heating elements, sensors and other spare parts cannot be returned once fitted.
Cancelling before it ships. No fee at all before we send the order to the distributor. After that an administrative fee of up to 5 percent may apply, and we waive it when we are not charged ourselves.
To start a return. Call (888) 500-5675. A Return Authorization number is required before anything ships back. Refunds go to the original payment method within 7 business days of the return being received and inspected.
PRODUCT DESCRIPTION
Jump to7 sections
The wall mounted STEEL
The HUUM STEEL Mini 4 is a 4 kW wall mounted electric sauna heater for rooms of 106 to 177 cubic feet
The smallest STEEL and the only one that hangs on the wall, for rooms of 106 to 177 cubic feet. It is 6.3 inches deep and asks for only 2 inches to the wall beside it.
The room
106 to 177 cu. ft.
Length by width by height, in feet. Add 3.3 cubic feet for every square foot of uninsulated glass, tile or brick wall, then size from the adjusted number.
Rated current
14.58 A at 240 V
HUUM's manual calls for a 20 A breaker and 12 AWG cable, the lightest circuit in the range. It is hardwired by a licensed electrician, who sizes the circuit to the National Electrical Code, which can call for more.
The rest of the order
Control and 4 boxes of stone
Neither is in the carton. A HUUM UKU control runs the heater from outside the room, and this heater holds about 132 lb (60 kg) of sauna stone.
Sizing
Will the HUUM STEEL Mini 4 heat your sauna?
Sauna heaters are sized on room volume, not floor area. Measure the room in feet and multiply length by width by height, then pick the heater whose published range contains that figure.
HUUM rates the STEEL Mini 4 for 106 to 177 cubic feet on a 240 volt supply, and its manual warns that the warranty does not apply if the heater and room are dimensioned incorrectly.
Cold surfaces change the answer. HUUM's manual says to add 3.3 cubic feet of volume for every square foot of uninsulated brick, tile or glass wall in the room. It does not say whether a glass door counts, so counting it is the cautious choice.
| Model | Rated room | Output |
|---|---|---|
| STEEL Mini 4 This heater | 106 to 177 cu. ft. at 240 V, 106 to 159 at 208 V | 4 kW |
| STEEL 6 | 177 to 318 cu. ft. at 240 V, 142 to 248 at 208 V | 6 kW |
| STEEL 9 | 283 to 460 cu. ft. at 240 V, 212 to 354 at 208 V | 9 kW |
| STEEL 11 | 354 to 566 cu. ft. at 240 V, 265 to 424 at 208 V | 11 kW |
A worked example for the STEEL Mini 4
Take a room 5 feet by 4 feet with a 7.5 foot ceiling: 20 square feet of floor and 150 cubic feet, inside this heater's 106 to 177. Count a full glass door, take 13 square feet as an example and measure your own, and at 3.3 cubic feet a square foot the room behaves like about 193 cubic feet, which is past the STEEL Mini 4 and into STEEL 6 territory.
HUUM's STEEL manual gives a minimum sauna room height of 86.6 inches (2200 mm), with a regular height of 86.6 to 91 inches, and advises bringing a taller ceiling down into that range to reduce the volume.
Not sure which way a borderline room goes? Our sauna heater finder walks the same arithmetic, the sauna heater buyers guide explains what the numbers mean, or call and we will do it with you.
What makes it a STEEL
What the STEEL Mini 4 is built around
The STEEL wraps its stone in a stainless steel enclosure. HUUM describes it as a sleek design with small safety distances, and the manual's figures bear that out.
A lot of stone for the size
It holds about 132 lb (60 kg). HUUM describes the STEEL as holding a large amount of stone for gentle and long lasting steam.
On the wall
The heater is 12.2 in W x 6.3 in D x 38.4 in H. The Mini 4 hangs on the wall on a special bracket.
What the STEEL Mini 4 gives up
Electrically it matches the CLIFF Mini 4: 14.58 amps at 240 volts, with HUUM's manual calling for a 20 amp breaker and 12 AWG cable. It holds about 132 pounds of stone, 4 boxes. Beyond small differences in width and clearance, the choice between the two Minis is mostly the look: the STEEL wraps its stone in a stainless steel enclosure.
What it gives up is the accessory range. HUUM lists its STEEL safety rail, reflector and the CLIFF and STEEL embedding flange for the 6, 9 and 11, not the Mini 4, so a guard around the Mini is something your builder makes. On 208 volts it makes 2.85 kW for 106 to 159 cubic feet.
The whole order
What a working STEEL Mini 4 takes, beyond the heater
A sauna heater is several purchases, and the others are easy to miss. Nothing here is padding: the heater will not run without them.
| The heater | This page. |
|---|---|
| A certified control | The control unit goes outside the hot room. HUUM's matched control is the UKU, and it is the controller the heater was certified with: the HUUM UKU Local control or the HUUM UKU Wi-Fi control. |
| 4 boxes of stone | About 132 lb (60 kg), 1.2 to 1.9 inches (3 to 5 cm). HUUM olivine diabase sauna stones come in 33 pound boxes. |
A guard is a code item, not an upsell
The International Residential Code asks for sauna heaters to be protected from accidental contact by a guard made of a material with low thermal conductivity, such as wood, without blocking the heat. HUUM makes no rail for the Mini 4, so the guard is built on site. HUUM's manual recommends a material with low heat capacity and poor thermal conductivity. HUUM adds that when the guard is a flammable material such as wood, the heater's minimum safety distances still have to be kept to it. Check what your local code has adopted.
Buying the heater, the control and the stone together settles the order in one go: our HUUM STEEL Mini 4 sauna heater package is exactly that, priced at the parts added together. Or call and we will price the heater, control and stone together.
Electrical
The breaker and wire size the HUUM STEEL Mini 4 needs
Settle this before you buy, because it is the line item that surprises people. The heater is hardwired by a licensed electrician.
The figures below are HUUM's, from its US manual. They are the manufacturer's minimum, not a design for your house: sauna heating is a continuous load, so the National Electrical Code can require a larger breaker and heavier conductors than the manual's figure, and local amendments differ. Your electrician sizes the circuit.
| Supply | What HUUM specifies | Rated room |
|---|---|---|
| 240 VMost homes | 4 kW, 14.58 A, 20 A breaker, 12 AWG minimum cable | 106 to 177 cu. ft. |
| 208 V | 2.85 kW, 12.5 A, 20 A breaker, 12 AWG minimum cable | 106 to 159 cu. ft. |
What the manual requires
The supply cable has to meet UL 62 in the United States or CSA 49 in Canada, and a means of disconnecting all poles, a circuit breaker, goes on the power circuit before the control. Cable with non heat resistant PVC insulation is not allowed, and the junction box must be waterproof and within 20 inches (50 cm) of the floor. HUUM's STEEL manual says any certified control panel may be used, and that the heater may be used only with a control unit that has a timer function.
HUUM recommends connecting the heater without a GFCI breaker. Its manual says it is recommended to connect the unit to the mains without one. Whether you can follow that depends on where the sauna goes and which edition of the electrical code your area has adopted: an outdoor sauna at a home may fall inside the Code's ground fault requirement for outdoor outlets at these ratings, depending on the edition adopted and how your inspector reads it, while an indoor hardwired heater usually is not caught. Where the manual and the adopted code disagree, the code and your inspector decide.
Why it is listed, and why that matters
It is listed by SGS, not by UL. SGS North America is on OSHA's list of nationally recognized testing laboratories, and it lists the STEEL Mini 4 for the United States and Canada under certificate SGSNA/20/SUW/00067X, to UL 60335-1, CAN/CSA C22.2 No. 60335-1, CAN/CSA E60335-2-53 and IEC 60335-2-53. The listing applies on the conditions SGS records against it: the heater is used with sauna stones, run from an approved sauna heater controller (the listing was evaluated with the UKU), supplied by conductors rated to at least 90 degrees C, and carries the warning tag on the bottom rung of the frame. SGS also requires CLIFF and STEEL models to be anchored in place. Inspectors differ on what they ask to see for a sauna heater, so check with yours before you buy. We can send you the certificate.
Clearances
Where the HUUM STEEL Mini 4 can go
Clearances are set per model and generally grow with output. These are this model's figures from HUUM's manual.
| To the wall beside the heater | 2.0 in |
|---|---|
| Wall to wall across the heater | 16.1 in |
| Above the heater, to the ceiling | 47.3 in (1200 mm) |
| Body size | 12.2 in W x 6.3 in D x 38.4 in H |
| Weight | 32.0 lb without stone |
| Mounting | Wall mounted with a special bracket |
The Mini 4 is attached to the wall with a special bracket. Plan the wall reinforcement and cable run before the lining boards go on.
The room itself has to be built for a sauna, with an insulated shell, a reflective vapor barrier and supply and exhaust vents. Our traditional sauna rooms arrive built that way.
Stone
How much stone the STEEL Mini 4 takes, and how to lay it
The stone is not a finishing touch. It is the thermal mass that turns 4 kW into steam, and the heater may not be switched on without it.
This heater holds about 132 lb (60 kg), which is 4 boxes of HUUM stone. HUUM asks for stone 1.2 to 1.9 inches (3 to 5 cm) across and supplies olivine diabase in 33 pound boxes.
Laying it
Wash the stone first. Stack it loosely between the elements: HUUM's manual warns that stone packed too close makes the elements overheat, which shortens their life and slows the heating. The stone on the outer face goes close together, so no element is visible. HUUM recommends having a specialist lay the stone, and allows ceramic stones only at the user's own responsibility.
HUUM's manual requires the stone to hide the elements completely, and warns that a sparsely filled stone container is a fire hazard.
Running cost
What the STEEL Mini 4 costs to run
A sauna heater draws its full rated power while it heats, then cycles on the thermostat to hold temperature. That makes the ceiling easy to calculate and the real figure lower.
| Full output, one hour | 4 kW x 0.183 = about 0.73 dollars |
|---|---|
| Three hours at full draw, heat up and a session | about 2.20 dollars |
| Three of those a week | about 7 dollars a week |
Those are ceilings, not averages: once the room is at temperature the thermostat cycles the elements, so the real bill lands under these ceilings. Your own rate is on your utility bill and varies widely by state.
Insulation controls this number, not the heater. HUUM's manuals call for an insulated room so the heater can run at its regular output.
What you get
In the STEEL Mini 4 carton
- Electric heater
- 4 adjustable legs
- Installation and operation manual
Not included
The control, the stone, and the electrical work. The control and 4 boxes of stone are required to operate the heater.
Lead time
Delivery estimates are shown on this page and at checkout. If you need a date before you commit, call us and we will confirm the current position with the distributor.
Reference
HUUM STEEL Mini 4 specifications
Full specification tables
| Heater output | 4 kW at 240 V, 2.85 kW at 208 V |
|---|---|
| Room volume | 106 to 177 adjusted cu. ft. at 240 V, 106 to 159 cu. ft. at 208 V |
| Minimum room height | 86.6 in (2200 mm) |
| Rated current | 14.58 A at 240 V, 12.5 A at 208 V |
| Circuit breaker | 20 A at 240 V, 20 A at 208 V |
| Minimum supply cable | 12 AWG at 240 V, 12 AWG at 208 V |
| Stone capacity | About 132 lb (60 kg), 4 boxes |
| Stone size | 1.2 to 1.9 in (3 to 5 cm) |
| Body size | 12.2 in W x 6.3 in D x 38.4 in H |
| Clearance to the wall beside it | 2.0 in |
| Wall to wall across the heater | 16.1 in |
| Clearance above the heater | 47.3 in |
| Mounting | Wall mounted with a special bracket |
| Control | Separate certified control required, sold separately |
| Part number | H1007012 |
|---|---|
| Heater weight, empty | 32.0 lb |
| Supply | Single phase, 60 Hz |
| Certification | SGS Listed for North America (SGSNA/20/SUW/00067X) |
| Warranty | HUUM limited warranty, 3 years for private use and 1 year for commercial use |
The range
HUUM STEEL Mini 4 against the rest of the STEEL range
Every figure below is HUUM's own, from its US manual, and the breaker column is the manufacturer's minimum rather than a design for your house.
Scroll the table sideways to see every model.
| HUUMSTEEL Mini 4You are here | HUUMSTEEL 66 kW, 177 to 318 cu. ft. | HUUMSTEEL 99 kW, 283 to 460 cu. ft. | HUUMSTEEL 1111 kW, 354 to 566 cu. ft. | |
|---|---|---|---|---|
| Output at 240 V | 4 kW | 6 kW | 9 kW | 11 kW |
| Rated room | 106 to 177 cu. ft. | 177 to 318 cu. ft. | 283 to 460 cu. ft. | 354 to 566 cu. ft. |
| Current | 14.58 A | 25 A | 37.5 A | 43.75 A |
| Breaker | 20 A | 30 A | 50 A | 50 A |
| Minimum cable | 12 AWG | 10 AWG | 8 AWG | 8 AWG |
| To the wall beside it | 2.0 in | 2.0 in | 3.94 in | 3.94 in |
| Stone | 4 boxes | 10 boxes | 10 boxes | 10 boxes |
When a STEEL is the wrong heater
The STEEL tops out at 11 kW and 566 cubic feet. If you want the stone on show, the CLIFF carries the same outputs in a slimmer 10.6 inch column. For a bigger room, a HIVE goes to 18 kW.
Compare the whole range on our electric sauna heaters page, browse every sauna heater we carry, or see every model in our HUUM sauna heaters collection.
Buyer questions
HUUM STEEL Mini 4 questions buyers ask before ordering
What size sauna will the HUUM STEEL Mini 4 heat?
HUUM rates it for 106 to 177 cubic feet on 240 volts, or 106 to 159 cubic feet on 208 volts. Measure length by width by height in feet, then add 3.3 cubic feet for every square foot of uninsulated glass, brick or tile wall, and size from that number.
Does the HUUM STEEL Mini 4 come with a control?
No. Every HUUM electric heater needs a separate certified control, bought separately, and the control unit goes outside the hot room. HUUM's matched control is the UKU, the controller this heater was certified with, in Local or Wi-Fi form.
How many boxes of stone does the HUUM STEEL Mini 4 need?
4 boxes. The heater holds about 132 lb (60 kg) and HUUM asks for stone 1.2 to 1.9 inches (3 to 5 cm) across. HUUM's own stone is olivine diabase in 33 pound boxes. The heater may not be run before it is properly filled.
What breaker and wire does the HUUM STEEL Mini 4 need?
On 240 volts it draws 14.58 A and HUUM specifies a 20 A breaker with 12 AWG cable. On 208 volts it is 12.5 A, a 20 A breaker and 12 AWG. The cable must meet UL 62 in the United States or CSA 49 in Canada, and your electrician sizes the install to the National Electrical Code and to local amendments.
Is the HUUM STEEL Mini 4 UL listed?
It is listed by SGS, not by UL. SGS North America is on OSHA's list of nationally recognized testing laboratories, and it lists the STEEL Mini 4 for the United States and Canada under certificate SGSNA/20/SUW/00067X, to UL 60335-1, CAN/CSA C22.2 No. 60335-1, CAN/CSA E60335-2-53 and IEC 60335-2-53. The listing applies on the conditions SGS records against it: the heater is used with sauna stones, run from an approved sauna heater controller (the listing was evaluated with the UKU), supplied by conductors rated to at least 90 degrees C, and carries the warning tag on the bottom rung of the frame. SGS also requires CLIFF and STEEL models to be anchored in place. Inspectors differ on what they ask to see for a sauna heater, so check with yours before you buy. We can send you the certificate.
Can I install the HUUM STEEL Mini 4 myself?
Not if you want the warranty. HUUM's warranty requires the heater to be installed and connected by a licensed electrician, with proof presented to HUUM, and HUUM recommends a specialist lays the stone. The heater is hardwired and the manual forbids cable with non heat resistant PVC insulation. Keep the electrician's invoice.
Does the HUUM STEEL Mini 4 need a GFCI breaker?
HUUM's manual says it is recommended to connect the heater without one. Whether you can follow that depends on where the sauna goes and which edition of the electrical code your area has adopted. An outdoor sauna at a home may fall inside the Code's ground fault requirement for outdoor outlets at these ratings, depending on the edition adopted and how your inspector reads it, while an indoor hardwired heater usually is not caught. Where the manual and the adopted code disagree, the code and your inspector decide.
Can the HUUM STEEL Mini 4 be set into the bench?
HUUM describes bench embedding and lists its embedding flange for the full size 6, 9 and 11, not the Mini 4, which hangs on the wall on its own bracket.
Does the HUUM STEEL Mini 4 need a UKU extension box?
No. The extension box is for HUUM heaters above 11 kW, which means the HIVE 12, 15 and 18. This heater runs from the UKU's main module on its own.
What warranty comes with the HUUM STEEL Mini 4?
HUUM warrants its electric heaters, wood stoves and controls for 3 years in a private sauna and 1 year in a commercial one, from the date of purchase, with spare parts covered for 1 year. Heating elements, controller sensors, stones, HUUM accessories, and wood stove door glass and ash grates are excluded, and so is damage from unsuitable stones or from a heater sized wrong for the room. HUUM counts it as commercial use if a registered business uses the product commercially, if a private user uses it commercially, or if a private user runs it for more than 1,500 hours in a 12 month period. For the warranty to apply, the heater has to be installed and connected by a licensed electrician with proof presented to HUUM, installed and operated to HUUM's manual and to local building, electrical and fire codes, and installed complete. Damage found on delivery has to be reported to us within 48 hours of delivery, with photographs and before the heater is installed; that is our window, and because it is shorter than HUUM's 7 days, it is the one that applies to the HUUM warranty. Any defect has to be reported within 30 days of discovering it. Because elements are excluded, we stock them as replacement parts.
One last thing
Get the heater, the control and the stone right
Tell us the room dimensions and how the walls are built and we will walk you through the manual's own figures for output, circuit, clearances and stone before you order, and your electrician confirms the circuit. If the room is borderline we will say so rather than sell you the bigger heater.
Recovery Room DirectSauna specialistsMonday to Saturday, 9AM to 6PM ET
