HUUM CLIFF Series Electric Sauna Heater
Floor-standing HUUM CLIFF electric sauna heater, 6–10.5 kW for 177–566 cu ft rooms, holding about 165 lb of stones between stainless-steel ribs
- Red Dot award-winning design (2021)
- About 165 lb of stones for mild, long-lasting steam
- App control with the HUUM UKU Wi-Fi
What Customers Say About This Product
“Compact heater, big performance The compact footprint was perfect for my small room. Delivery was quick, and installation with an electrician took under two hours.…”
“Sleek Look, Amazing Steam. Total Space Saver. Absolutely love my HUUM CLIFF. It’s the perfect solution for my small sauna, tucking neatly against the wall…”
“A Stunning, Space-Saving Centerpiece with Fantastic Löyly The HUUM CLIFF 9kW has completely transformed my small home sauna. I chose this model specifically for its…”
- Description
- Specifications
- Installation
- What's Included
- Documents
- Warranty
What is the HUUM CLIFF electric sauna heater?
The HUUM CLIFF is a slim, floor-standing electric sauna heater from HUUM of Estonia: a column of stainless-steel ribs, 38.4" tall and 10.6" square, that holds about 165 lb (75 kg) of stones. It comes in 6, 9 and 10.5 kW (HUUM's CLIFF 6, 9 and 11) for sauna rooms from 177 to 566 cu ft, runs on 240 V or 208 V, and needs a separate HUUM UKU control and five 33 lb boxes of stones. The CLIFF won a Red Dot design award in 2021.
On the CLIFF, the stones show between stainless-steel ribs that HUUM cuts from the offcuts of its STEEL heaters, so two heaters come from one sheet of steel. HUUM says the large stone load gives mild, long-lasting steam, and that an internal air tunnel speeds heating by 25% and extends the life of the heating elements. HUUM says its small safety distances and slim shape suit smaller sauna rooms.
How do you control the HUUM CLIFF?
The CLIFF has no built-in controls: it runs from a HUUM UKU control. UKU Local heats the sauna from the wall panel; UKU Wi-Fi adds the HUUM app, so you can start the sauna on your way home and schedule sessions ahead. The UKU runs heaters up to 11 kW on its own, so every CLIFF size, the 10.5 kW included, works without an extension box. Topture also sells the CLIFF as a package with the UKU control and stones included.
HUUM CLIFF key features
- Floor-standing on adjustable legs, anchored with the supplied brackets, or set partly into the bench with the HUUM Flange CS
- About 165 lb (75 kg) of 1.2–2" stones, visible between the ribs
- Every rib lifts off with the two supplied prop blocks, for stacking the stones
- Internal air tunnel that HUUM says speeds heating by 25%
- Stainless steel, with ribs cut from the offcuts of HUUM's STEEL heaters
- Red Dot design award 2021; designed and made in Estonia
- SGS listed to UL 60335-1 and CAN/CSA-C22.2 No. 60335-1
Which HUUM CLIFF size fits my sauna?
Choose the CLIFF by the volume of your sauna room. For every square foot of uninsulated brick, tile or glass wall, add 3.3 cu ft to the room volume before choosing. HUUM's warranty does not cover a heater whose output does not match the room volume. For rooms of 106–177 cu ft, HUUM makes the CLIFF Mini; every CLIFF size, as heaters and as packages, is in the HUUM CLIFF collection.
| 6 kW | 9 kW | 10.5 kW | |
|---|---|---|---|
| HUUM model | CLIFF 6 | CLIFF 9 | CLIFF 11 |
| Sauna room volume | 177–318 cu ft (5–9 m³) | 283–460 cu ft (8–13 m³) | 354–566 cu ft (10–16 m³) |
| Current at 240 V | 25 A | 37.5 A | 43.75 A |
| Circuit breaker | 30 A | 50 A | 50 A |
| Heater weight | 35.2 lb (16 kg) | 35.2 lb (16 kg) | 37.5 lb (17 kg) |
| HUUM part number | H1004012 | H1004022 | H1004032 |
Minimum wire size in HUUM's manual: 10 AWG for the CLIFF 6 and 8 AWG for the CLIFF 9. For the 10.5 kW, your electrician sizes the wire from the manual that ships with the heater and your local code.
| 6 kW | 9 kW | 10.5 kW | |
|---|---|---|---|
| Sauna room volume | 142–248 cu ft (4–7 m³) | 212–354 cu ft (6–10 m³) | 265–424 cu ft (7.5–12 m³) |
| Current at 208 V | 21.63 A | 32.45 A | 37.98 A |
| Circuit breaker | 30 A | 40 A | 50 A |
On a 208 V supply each size gives less output, so it heats a smaller room.
HUUM CLIFF dimensions and stones
| Dimensions | 38.4" H × 10.6" W × 10.6" D (975 × 270 × 270 mm) |
|---|---|
| Stones | About 165 lb (75 kg) of 1.2–2" (3–5 cm) stones: 5 boxes of HUUM Stones 12 (33 lb each) |
| Power supply | 240 V or 208 V, single phase |
| Materials | Stainless steel |
| Made in | Estonia |
| Certification | SGS listed to UL 60335-1 and CAN/CSA-C22.2 No. 60335-1 |
| Warranty | 3 years private use, 1 year commercial use (HUUM); heating elements, stones and sensors are excluded |
How is the HUUM CLIFF installed?
The CLIFF 6, 9 and 10.5 kW stand on adjustable legs and are anchored to the floor with the supplied brackets, screwed down with screws of preferably at least 6 × 40 mm; HUUM's SGS listing requires the anchoring. With the HUUM Flange CS the heater can instead sit partly inside the bench, with at least 21.7" (550 mm) of it above the bench surface. HUUM strongly recommends a safety rail around the heater, such as the HUUM Rail C.
HUUM's CLIFF manual says the electrical connection must be made by a licensed electrician, with a circuit breaker that disconnects all poles fitted before the sauna control, a heat-resistant power cable (no PVC insulation) and a waterproof junction box no higher than 20" (50 cm) above the floor; the cable enters through the heater's bottom cover. Your electrician sizes the breaker and wire from the manual that ships with the heater and your local code.
HUUM CLIFF safety distances
Keep at least these distances from the HUUM CLIFF to walls, benches and anything that can burn. The letters match the drawing.
| 6 kW | 9 kW | 10.5 kW | |
|---|---|---|---|
| A | 2.36" (60 mm) | 9.45" (240 mm) | 15" (380 mm) |
| B | 15.35" (390 mm) | 29.5" (750 mm) | 40.5" (1,030 mm) |
- A: minimum distance from the sides and front of the heater to walls or anything that can burn
- B: minimum width between the walls on either side of the heater
- At least 47.3" (1,200 mm) from the top of the heater to the ceiling
- With a HUUM Reflect C hooked onto one side, HUUM says the heater's safety distance to flammable material on that side is halved
HUUM's CLIFF manual gives a minimum sauna room height of 86.6" (2,200 mm), with a regular ceiling height of 86.6–91", allows only one heater per room, and calls for a sauna door that opens outward.
Stacking and caring for the stones
Wash the stones, then stack them loosely between the heating elements of the CLIFF and close together on the outside so no element shows. Packed too tightly, the elements overheat, wear out sooner and heat the room more slowly; a sparsely filled heater is a fire hazard. Take care not to bend the elements. Every rib lifts off with the two prop blocks supplied, which makes stacking easier. HUUM recommends having a specialist lay the stones. Stones crumble with use, so HUUM suggests ceramic tile with dark grout under and around the heater.
What's in the box with the HUUM CLIFF?
- HUUM CLIFF electric sauna heater, 6, 9 or 10.5 kW
- Adjustable legs
- Floor brackets for anchoring the heater
- Two prop blocks for removing the ribs
- Installation and operation manual
What you need separately
- A HUUM UKU control: UKU Local or UKU Wi-Fi (no extension box needed for any CLIFF)
- 5 boxes (165 lb) of HUUM Stones 12, 1.2–2" rounded stones
- A heat-resistant power cable, connected by a licensed electrician
- Optional: HUUM Rail C safety rail, HUUM Reflect C reflector or HUUM Flange CS embedding flange
HUUM warranty periods
HUUM's limited warranty (Limited Warranty Terms and Conditions, US, v2) covers new HUUM products bought from HUUM or its authorized dealers, such as Topture, against defects in materials and workmanship. The period starts on the date the end user buys the product.
| HUUM product | Private use | Commercial use |
|---|---|---|
| Electric sauna heaters | 3 years | 1 year |
| Wood-burning sauna stoves | 3 years | 1 year |
| Control units (UKU) | 3 years | 1 year |
| Spare parts | 1 year | 1 year |
HUUM counts as commercial use a business using the product commercially, a private owner using it commercially, or a private owner using it for more than 1,500 hours in 12 months.
What the warranty does not cover
- Heating elements of electric heaters
- HUUM accessories, such as rails, reflectors, flanges, protective bedding and chimney parts
- Door glass and ash grate of wood-burning stoves
- Sauna stones
- All controller sensors
- Damage from a heater that is the wrong size for the room, from unsuitable stones, or from installation, use or maintenance that does not follow HUUM's manuals
What keeps the warranty in effect
- Inspect the product when it arrives and report any visible damage within 7 days, with photos, before installing it.
- Install it following HUUM's manual and local building, electrical and fire codes. An electric product must be connected by a licensed electrician, with proof of the installation.
- Report a defect within 30 days of finding it. For products bought from Topture, report it to Topture, which passes the claim to HUUM and helps with troubleshooting.
