It's a compact wall-mounted electric sauna heater in brushed stainless steel, designed and made in Estonia. It's the smallest heater in the CLIFF range, built specifically for small sauna rooms where space is tight.

Rooms from 123 to 212 cubic feet. That's a genuinely small sauna — a one or two person room.

Length × width × height in feet. A 5' × 5' room with a 7' ceiling is 175 cubic feet, comfortably inside this heater's range. If you're near either end of the band, send us your dimensions and we'll check it properly.

If your room is over 212 cubic feet, no — step up to the CLIFF 6kW, which covers 176 to 353. Undersizing is the more expensive mistake, because the heater never quite gets there and works itself hard trying.

In a room it's correctly sized for, absolutely. Output determines how large a space a heater can bring to temperature, not how good the sauna is. And with 133 lbs of stone, this heater carries three times what a comparable small heater from another brand does — the löyly is substantial.

Yes, and on a small heater it matters more. Glass sheds heat faster than insulated timber, so a glass-fronted room behaves like a larger one. With 3.5 kW there's little margin — tell us your glass area before you order.

Yes, and it's the only CLIFF that is. The 6, 9 and 10.5 kW models are all floor-standing; the Mini mounts on the wall, which is part of what makes it suit a tight room.

Extremely short safety distances, so it can sit closer to benches and walls than most heaters — the whole point in a small room. It also has an internal air duct that makes it heat up to 25% faster than a comparable heater.

It channels air through the heater rather than letting it drift around the outside, which moves heat into the room faster. HUUM rate the improvement at up to 25% on heat-up time.

Because clearances, not the heater itself, usually dictate your sauna layout. A heater needing large safety distances eats bench space you wanted for people. In a 123 to 212 cubic foot room, every inch counts — which is exactly what this heater is for.

Yes, and this is not optional. Every HUUM heater requires a UKU controller, sold separately. There is no built-in control version — a CLIFF Mini without a UKU simply won't run.

The UKU Local for straightforward digital control at the wall, or the UKU Wi-Fi if you want app control and scheduling from your phone. There are also Glass, Mirror and Gold finishes. Tell us how you'll use the sauna and we'll recommend one.

It isn't a choice — HUUM heaters don't function without one. Worth factoring into your budget from the start rather than discovering it at checkout, and worth asking us for a package price on heater, controller and stones together.

No. That's only required for heaters 12 kW and above. A 3.5 kW heater runs on the UKU controller alone.

240V. It's hardwired — no plug. Ask us for the exact amperage and we'll give it to you in writing before your electrician quotes.

Yes. At 3.5 kW it's by far the lightest electrical load in the range — the CLIFF 6 is nearly double and the 10.5 kW draws 43.75 amps. If your panel is close to capacity, or you're running power to an outbuilding, that's a genuine advantage.

Yes, any licensed electrician can. Give them the manual and the load figures before they quote — the UKU controller wiring is part of the same job.

6.75" wide × 11.5" deep × 38.5" high (171 × 292 × 978 mm). Very narrow, but tall — it's the same height as the larger CLIFFs, just much slimmer.

At 38.5 inches plus the clearance above, check your ceiling height before ordering. In a small sauna with a lower ceiling this is worth measuring rather than assuming.

33 lbs empty — but it takes 133 lbs of stones, so plan for around 165 lbs hanging on your wall. It must be mounted into solid framing, not just cladding.

Only if it's mounted into proper framing. 165 lbs on cladding alone is not acceptable. If you're building the sauna, tell your carpenter where the heater goes so blocking can be added before the walls close up.

Extremely short distances by the standards of the category — that's the Mini's defining feature. The exact minimums are in the installation manual and they remain a fire-safety requirement, so check them before finalising bench placement.

No. The CLIFF Mini takes 133 lbs of stones — four boxes of HUUM 1"–2" (3–5 cm) stones at 33 lbs each — ordered separately. The heater won't run safely without them.

Yes, and it's the point. Most small heaters carry 30 to 50 lbs. The Mini's stone mass is what gives it a long, mild heat and a proper löyly rather than the sharp, thin heat you get from a small heater with little stone.

Yes, and it isn't optional. Budget for it properly when pricing the project — 133 lbs of rock is a real cost and a real freight item. Ask us for a delivered price on the complete package rather than being surprised later.

HUUM specify 1"–2" stones, smaller than the 2"–4" typical of Harvia heaters. The CLIFF's design exposes more stone surface to the room, and the smaller size suits that geometry. Don't substitute larger stones from another brand.

The CLIFF has removable rib slats that let you stack stones more accurately and evenly. Two prop blocks are supplied for removing them during loading, then they go back in.

Rinse them first, then stack loosely so air moves freely between them — never wedged tight. Use the removable ribs and supplied prop blocks to get an even column. The manual shows the correct arrangement.

Only proper sauna stones in the specified size. Never river rock, granite, or decorative landscape stone — ordinary rock can crack or explode when water hits it at temperature.

Inspect them once a year. They break down with repeated heating and cooling, and crumbling stones choke airflow. Restack as they settle, replace when they start falling apart.

The stones sit directly against the heating elements rather than being separated by a shield. Heat transfers into the stone mass more efficiently, which is what gives the heater its steam response when you ladle water.

By design. More exposed stone gives a longer, milder heat — the warmth comes off the stone mass rather than radiating hard off metal. It's a softer sauna than a heater with the stones enclosed.

Up to 110°C (230°F), which is higher than most heaters allow. Most people run considerably below that — 70 to 85°C is a typical Finnish range.

Faster than comparable heaters thanks to the internal air duct — HUUM rate it at up to 25% quicker. That said, 133 lbs of stone takes time to charge properly, so it won't be instant.

Yes — that's the point of a traditional heater. Ladle water over the stones for löyly. Plain water, a ladleful at a time, never poured directly onto the elements.

Only products made for sauna use, diluted in the water bucket rather than poured neat on the stones. Undiluted oils can scorch, stain the stones, and in some cases ignite.

Brushed stainless steel construction, with stainless steel industrial-quality heating elements.

Yes — HUUM stock replacement elements as service parts. Worth knowing, because elements are excluded from the warranty as a wear item.

The heater, two prop blocks for removing the rib slats during stone loading, the installation and operation manual, and the warranty. Stones and the UKU controller are separate.

Ask us for the current written terms on this model before you order. Across the CLIFF range HUUM list a limited residential warranty excluding heating elements, and we'd rather send you the exact terms than have you assume.

Heating elements are consumable in any sauna heater, like stones. HUUM stock them as service parts, and how long yours last depends heavily on whether you keep the stones properly stacked — packed-tight stones are the main cause of early element failure.

Tell us if it's going into a gym, spa or hotel and we'll confirm the commercial warranty terms. At this output it's more likely to suit a small treatment room than a busy commercial sauna.

Ask us to confirm the current North American listing before you order and we'll send it in writing — your electrical inspector will want documentation.

Designed, engineered and manufactured in Estonia.

The 6 kW covers 176 to 353 cubic feet against this one's 123 to 212, carries 165 lbs of stone rather than 133, and stands on the floor rather than mounting to the wall. There's overlap between 176 and 212 cubic feet — in that band either works, and the Mini is cheaper, lighter on the circuit, and doesn't take floor space.

Both suit small rooms, very different heaters. The KIP45 is 4.5 kW with 44 lbs of stone, has a built-in control option, and costs considerably less. The Mini carries three times the stone for a softer heat but requires a UKU controller on top. If budget matters, KIP; if löyly quality does, the Mini.

No. Too much output means the heater reaches temperature and shuts off before the stones are properly charged, giving you a hot room with weak steam — the opposite of what you want. It also means a bigger circuit for no benefit.

By LTL freight rather than parcel. That means a delivery appointment and a truck at kerbside rather than a courier at the door. Tell us about your access and we'll sort the details with you.

HUUM's supplier lead time runs around 40 days, so this isn't a stock item you'll have next week. If you're working to a build schedule, order early and tell us your deadline so we can be straight with you about whether it's achievable.

Wipe the casing occasionally, check and restack the stones annually, keep debris from building up around the unit, and let the room air out after each session.

Call us. We handle warranty claims directly with HUUM rather than handing you a phone number, and service parts including elements are available.

Because a working installation is the heater, a UKU controller, 133 lbs of stone and an electrical job. Freight varies by address and this ships LTL. Request pricing and you'll get one delivered figure for the complete setup rather than a number you have to keep adding to.

We're an authorized HUUM dealer. On a heater that requires a controller, four boxes of stone and wall framing that can carry 165 lbs, having someone confirm the whole package before you order is worth more than a slightly cheaper box.