Authorized HUUM DealerManufacturer's Warranty Included
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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.
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.
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.
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.
The HUUM CLIFF 6 is a 6 kW floor standing electric sauna heater for rooms of 177 to 318 cubic feet
Six kilowatts for rooms of 177 to 318 cubic feet, in a column 10.6 inches square that stands on the floor.
The room
177 to 318 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
25 A at 240 V
HUUM's manual calls for a 30 A breaker and 10 AWG cable. It is hardwired by a licensed electrician, who sizes the circuit to the National Electrical Code. On this model HUUM's breaker figure is below what the Code's continuous-load rule gives for its rated current, so your electrician and inspector decide the breaker and cable, and they may be larger than HUUM's figure.
The rest of the order
Control and 5 boxes of stone
Neither is in the carton, and neither needs a second order: open Complete your heater just above the Add to Cart button and both travel on this one. A HUUM UKU control runs the heater from outside the room, and this heater holds about 165 lb (75 kg) of sauna stone.
Watch
Building it into the bench
The optional embedding flange, from bench cut-out to finished edge.
HUUM filmed this itself. Its heater installation films are made for Europe and show European wiring, so we do not run them here: the sauna side of the job is the same, the electrical side is not.
Sizing
Will the HUUM CLIFF 6 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 CLIFF 6 for 177 to 318 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
CLIFF Mini 4
106 to 177 cu. ft. at 240 V, 106 to 159 at 208 V
4 kW
CLIFF 6 This heater
177 to 318 cu. ft. at 240 V, 142 to 248 at 208 V
6 kW
CLIFF 9
283 to 460 cu. ft. at 240 V, 212 to 354 at 208 V
9 kW
CLIFF 11
354 to 566 cu. ft. at 240 V, 265 to 424 at 208 V
11 kW
A worked example for the CLIFF 6
Take a room 7 feet by 6 feet with a 7.5 foot ceiling: 42 square feet of floor and 315 cubic feet, inside this heater's 177 to 318. 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 358 cubic feet, which is past the CLIFF 6 and into CLIFF 9 territory.
HUUM's CLIFF 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 CLIFF
Why the CLIFF 6 looks like a column of stone
The CLIFF puts its stone on the outside. The heating elements run inside and the outer face of the heater is the stone itself.
The stone is the surface
HUUM describes the CLIFF as having a natural stone surface that reflects the Nordic cliffs it is named for. The stone sits behind removable steel ribs, and the carton includes 2 blocks for taking the ribs off to lay it. HUUM says the CLIFF won a Red Dot Design Award in 2021.
Slim, and on the floor
The heater is 10.6 in W x 10.6 in D x 38.4 in H. The 6, 9 and 11 stand on the floor and are anchored to it with brackets, fixed with a suitable screw, preferably at least 6 x 40 mm, according to HUUM's manual.
It can be sunk into the bench
HUUM says the CLIFF can be embedded into the sauna bench, with at least 21.7 inches (550 mm) of the heater above the bench surface. The CLIFF and STEEL embedding flange covers the cut edge.
The HUUM CLIFF 6.
Why the CLIFF 6 fits where others do not
HUUM's manual asks for only 2.36 inches between the CLIFF 6 and the wall beside it, and 15.35 inches wall to wall across the heater. That is the same as the wall mounted Mini, on a heater with half again the output, so it suits a small room.
The clearance does not stay that small up the range. The CLIFF 9 needs 9.45 inches to the side wall and the CLIFF 11 needs 15, so if your room sits near the top of this heater's range, check the space before you size up.
The whole order
What a working CLIFF 6 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.
Required to operate
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.
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. You can build one or use the CLIFF safety rail HUUM makes for this heater. 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.
Optional
The reflector panel is the part HUUM makes for a tight space: HUUM states it halves the heater's safety distance to the walls, and the heater manual's own distances still decide the layout until your inspector agrees. The embedding flange is only needed if the heater is sunk into a bench.
Buying the heater, the control and the stone together settles the order in one go: our HUUM CLIFF 6 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 CLIFF 6 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. On this model HUUM's breaker figure is below what the Code's continuous-load rule gives for its rated current, so your electrician and inspector decide the breaker and cable, and they may be larger than HUUM's figure.
Supply
What HUUM specifies
Rated room
240 VMost homes
6 kW, 25 A, 30 A breaker, 10 AWG minimum cable
177 to 318 cu. ft.
208 V
4.8 kW, 21.63 A, 30 A breaker, 10 AWG minimum cable
142 to 248 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 CLIFF 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
Listed, but by SGS rather than UL. SGS North America is on OSHA's list of nationally recognized testing laboratories, and its certificate SGSNA/20/SUW/00067X covers the CLIFF 6 for the United States and Canada. SGS records conditions against that listing, and they are set out in full in the listing section above.
Why this page quotes two voltages
There is nothing to pick here, and nothing on this page selects it. Almost every US home is supplied at 240 volts, while many commercial buildings and some apartment blocks are supplied at 208. It is the same heater either way, wired the same way: on 208 volts it draws less and makes less heat, so HUUM publishes a separate output and a smaller room range for it, which is why the rows under the Add to Cart button and the table below both give two. Your electrician reads the panel and tells you which row applies. Either way it is hardwired into the circuit, not plugged into an outlet.
Clearances
Where the HUUM CLIFF 6 can go
Clearances are set per model and generally grow with output. These are this model's figures from HUUM's manual.
Minimum distances, CLIFF 6
To the wall beside the heater
2.36 in
Wall to wall across the heater
15.35 in
Above the heater, to the ceiling
47.3 in (1200 mm)
Body size
10.6 in W x 10.6 in D x 38.4 in H
Weight
35.2 lb without stone
Mounting
Floor standing, anchored with the supplied brackets
HUUM's manual has the 6, 9 and 11 anchored to the floor with brackets on the heater legs, fixed with a suitable screw, preferably at least 6 x 40 mm. SGS lists the CLIFF and STEEL on the condition that they are anchored.
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.
In a finished sauna, with the clearances this page lists.
Stone
How much stone the CLIFF 6 takes, and how to lay it
The stone is not a finishing touch. It is the thermal mass that turns 6 kW into steam, and the heater may not be switched on without it.
This heater holds about 165 lb (75 kg), which is 5 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. On the CLIFF the ribs come off for the job, using the 2 blocks in the carton, and go back on left end first. 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.
The stone bed, filled as the manual asks.
Running cost
What the CLIFF 6 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.
At the US average residential price of 18.3 cents a kilowatt hour (EIA, June 2026)
Full output, one hour
6 kW x 0.183 = about 1.10 dollars
Three hours at full draw, heat up and a session
about 3.29 dollars
Three of those a week
about 10 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 CLIFF 6 carton
Electric heater
2 blocks for removing the stone ribs
Installation and operation manual
Not included
The control, the stone, and the electrical work. The control and 5 boxes of stone are required to operate the heater. The rail, reflector and embedding flange are optional.
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 CLIFF 6 specifications
Full specification tables
From the CLIFF User Manual USA v9 (November 2025), Tables 1 to 3
Heater output
6 kW at 240 V, 4.8 kW at 208 V
Room volume
177 to 318 adjusted cu. ft. at 240 V, 142 to 248 cu. ft. at 208 V
Minimum room height
86.6 in (2200 mm)
Rated current
25 A at 240 V, 21.63 A at 208 V
Circuit breaker
30 A at 240 V, 30 A at 208 V
Minimum supply cable
10 AWG at 240 V, 10 AWG at 208 V
Stone capacity
About 165 lb (75 kg), 5 boxes
Stone size
1.2 to 1.9 in (3 to 5 cm)
Body size
10.6 in W x 10.6 in D x 38.4 in H
Clearance to the wall beside it
2.36 in
Wall to wall across the heater
15.35 in
Clearance above the heater
47.3 in
Mounting
Floor standing, anchored with the supplied brackets
Control
Separate certified control required, sold separately
Part number, certification and warranty
Part number
H1004012
Heater weight, empty
35.2 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 CLIFF 6 against the rest of the CLIFF 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.
The CLIFF tops out at 11 kW and 566 cubic feet. The STEEL of the same output asks for slightly less side clearance, but needs more width wall to wall. For a bigger room, a HIVE goes to 18 kW.
HUUM rates it for 177 to 318 cubic feet on 240 volts, or 142 to 248 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 CLIFF 6 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 CLIFF 6 need?
5 boxes. The heater holds about 165 lb (75 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 CLIFF 6 need?
On 240 volts it draws 25 A and HUUM specifies a 30 A breaker with 10 AWG cable. On 208 volts it is 21.63 A, a 30 A breaker and 10 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. On this model HUUM's breaker figure is below what the Code's continuous-load rule gives for its rated current, so your electrician and inspector decide the breaker and cable, and they may be larger than HUUM's figure.
Is the HUUM CLIFF 6 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 CLIFF 6 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 CLIFF 6 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 CLIFF 6 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 CLIFF 6 be set into the bench?
Yes, with the embedding flange. HUUM's condition is that at least 21.7 inches (550 mm) of the heater still stands above the bench surface once it is set in; the flange itself only covers the cut edge of the opening.
Does the HUUM CLIFF 6 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 CLIFF 6?
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
Not sure the CLIFF 6 is the right output?
Tell us the room size and how the walls are built, and we will size it with you before you order. The stone and the UKU control sit on this page, above Add to Cart, so the whole order goes in together. If you would rather take it in one line, we build the same parts as a sauna heater package.
ChaddySauna specialist, Recovery Room DirectMonday to Saturday, 9AM to 6PM ET