It's a tall, slender floor-standing electric sauna heater in brushed stainless steel, designed and made in Estonia. Its defining feature is remarkably small safety distances — it fits where most heaters of this output can't.

Ask us to confirm the exact room range for the 9 kW before you order. The CLIFF range covers a wide band and we'd rather size it against your actual room than have you work from a rounded figure. Send your dimensions and you'll get a straight answer.

Length × width × height in feet. A 7' × 7' room with a 7' ceiling is 343 cubic feet. Send us the numbers and we'll tell you whether the 9 kW is right or whether you want the 6 kW or 10.5 kW instead.

Yes. Glass sheds heat faster than insulated timber, so a glass-fronted room behaves like a larger one. Tell us your glass area before you order and we'll size against it rather than raw volume.

Two things. The safety distances are unusually small, so it can sit closer to benches and walls than most heaters — genuinely useful in a tight room. And an internal air duct 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, are usually what dictates your sauna layout. A heater needing large safety distances eats bench space you wanted for people. The CLIFF's tighter distances give you that space back.

Yes, and this is not optional. Every HUUM heater requires a UKU controller, sold separately. There is no built-in control version — a CLIFF 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.

No. The extension box is required for heaters 12 kW and above; the UKU main module handles up to 11 kW directly, so a 9 kW heater runs on the controller alone.

Confirm with us before your electrician quotes. A 9 kW heater is a substantial circuit, it's hardwired with no plug, and we'll give you the exact amperage in writing so nothing is guessed at.

Check before you buy. A heater at this output is a meaningful fraction of a typical 200-amp domestic service. Get an electrician to assess your panel first — that assessment costs very little and can save you an expensive mistake.

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

Roughly 11.25" wide × 11.25" deep × 38.25" high (286 × 286 × 972 mm) — the CLIFF shares a body across the range. Tall and narrow, taking very little floor area for its output.

At just over 38 inches plus the clearance above, check your ceiling height before ordering. It's considerably taller than a wall-mounted heater.

Under 40 lbs empty — but loaded with stone it's well over 150 lbs standing on your sauna floor.

On the floor. It's a floor-standing model rather than wall-mounted.

Less than most heaters of this size, which is the CLIFF's whole selling point — but the exact minimums are in the installation manual and they remain a fire-safety requirement. Check them before you finalise bench placement.

No. The CLIFF takes a substantial quantity of HUUM 1"–2" (3–5 cm) stones, ordered separately, and the heater won't run safely without them. Ask us for the exact number of boxes for this model and we'll quote it with the heater.

Because the exposed stone mass is what gives the CLIFF its character — a longer, milder heat that comes off the stone rather than radiating hard off metal. Budget for it properly when pricing the project; stone is a real cost and a real freight item.

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. 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. On a heater with this much stone, budget a decent hour for the annual check rather than ten minutes.

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. Exact timing depends on your room size, insulation and starting temperature.

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, 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.

Three years limited residential, and one year limited commercial — both excluding the heating elements, which are treated as a wear item. Ask us for the current written terms before you order.

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.

Yes — it carries a one-year commercial warranty. If it's going into a gym, spa or hotel, tell us; we handle commercial projects regularly and there may be considerations around duty cycle worth discussing.

It carries CE, SGS and IPX4 marks. 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.

One step up in output, covering rooms from 353 to 600 cubic feet and drawing 43.75 amps. Same design, same body, same tight clearances. If your room is under 353 cubic feet, this 9 kW is the right choice and cheaper to wire.

One step down for smaller rooms, on a lighter circuit. Same design and clearances throughout the range — choose on room volume rather than instinct.

Same 9 kW class, different shape and character. Tell us your room dimensions and layout and we'll walk you through which suits better — it often comes down to available floor space and the look you want.

HUUM heaters carry more stone and are built around exposed-stone heat, which many people find softer. They also require a controller in every case, where some Harvia models have built-in controls. Different philosophies — ask us and we'll lay out the trade-offs for your room.

No. Oversizing means a bigger circuit, a bigger installation cost, and a sauna that short-cycles and never develops proper steam. Size to the room.

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, a substantial quantity of stone and a real 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, multiple boxes of stone and a substantial circuit, having someone confirm the whole package before you order is worth more than a slightly cheaper box.

Please review our return policy at thesaunarepublic.com/policies/refund-policy. Because heaters are sized to a specific room, ship LTL and are hardwired on installation, talk to us before ordering if you have any questions.