It's a 9 kW cylindrical floor-standing electric sauna heater in brushed stainless steel. It's the slender version of HUUM's HIVE, built around an enormous stone mass — 330 lbs of it — which is what gives the HIVE its reputation for heat quality.

Rooms from 283 to 460 cubic feet. That covers a large home sauna comfortably.

Length × width × height in feet. A 7' × 7' room with a 7' ceiling is 343 cubic feet, right in the middle of this heater's range. If you're near either end of the band, send us your dimensions and we'll check it properly.

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.

Stone mass, and a lot of it. At 330 lbs this carries twice what a CLIFF does and five times a CORE. That much stone stores an enormous amount of heat, which gives a long, mild, enveloping löyly rather than sharp radiant heat off metal.

A channel through the centre of the heater, pre-installed at the factory. It shortens heat-up time — important when you're charging 330 lbs of stone — and it extends the life of the heating elements by improving airflow around them.

It's the slimmer version of the full HIVE. At 18.1" diameter against the standard HIVE's 22", it suits rooms where the full-size model would dominate the floor. Same design philosophy, smaller footprint and stone load.

Yes, and this is not optional. Every HUUM heater requires a UKU controller, sold separately. There is no built-in control version — a HIVE 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. That's only required for heaters 12 kW and above. A 9 kW heater runs on the UKU controller alone.

240V single phase, drawing 37.5 amps. It's hardwired — no plug. That's a substantial circuit and the first thing to resolve before ordering.

Check before you buy. A 37.5 amp load 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.

18.1" diameter × 29.5" high (460 × 750 mm). It's cylindrical rather than square, which changes how it sits in a corner compared to a boxy heater.

40.3 lbs empty — but with 330 lbs of stones it's over 370 lbs standing on your sauna floor. That's a genuine structural consideration.

On a concrete slab, no issue. On a raised timber floor or a deck, 370 lbs concentrated on an 18" circle is worth checking with your builder before you commit — particularly in a garden cabin or an upper-floor installation.

On the floor, with adjustable legs supplied for levelling on an uneven surface.

Minimum clearances to walls, benches and ceiling are in the installation manual and they're a fire-safety requirement, not a suggestion. Check them before you finalise bench placement.

No. The HIVE Mini takes 330 lbs of stones — ten boxes of 5–10 cm stones at 33 lbs each — ordered separately. The heater won't run safely without them.

Yes, and it's the largest stone requirement of anything we sell. Budget for it properly from the start — 330 lbs of rock is a serious cost and a serious freight item in its own right. Ask us for a delivered price on the complete package rather than discovering this at the end.

No. Every HIVE Mini takes the same 330 lbs — they share one body. The kW rating determines how large a room it heats; the stone mass and heat character are identical across the range.

Worth considering, and we'd rather tell you than quietly sell you the freight. If a local supplier stocks proper 5–10 cm sauna stone, buying locally can work out considerably better on a load this size. Just make sure it's genuine sauna stone.

Because the stone is the heater. 330 lbs stores an enormous amount of heat, which is what produces the HIVE's long, mild löyly and its ability to hold temperature through a long session. It isn't an accessory — it's the reason to buy this heater.

5–10 cm, the same as the CORE and DROP. Note the CLIFF range takes smaller 1"–2" (3–5 cm) stones — they aren't interchangeable, so check the model before ordering.

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, and you'd have 330 lbs of it.

Rinse them first, then stack loosely so air moves freely between them — never wedged tight or forced around the elements. Keep the air tunnel clear. The manual shows the correct arrangement, and on a load this size it's worth following exactly.

Longer than you'd expect — set aside a proper session for it rather than squeezing it in. It's also a two-person job if you'd rather not carry ten 33 lb boxes alone.

Inspect them once a year. They break down with repeated heating and cooling, and crumbling stones choke airflow. With 330 lbs to work through, budget real time for the annual check — but it's the single best thing you can do for element life.

The stones sit directly against the heating elements rather than being separated by a shield. Heat transfers into the stone mass more efficiently — which on a 330 lb load is exactly what you need.

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 the softest sauna in the HUUM range.

Ask us to confirm the maximum setting for this model. Across the HUUM range heaters run to Finnish temperatures, and most people sit between 70 and 85°C in practice.

Longer than a small-stone heater — there's a great deal of mass to charge, and a 9 kW moving 330 lbs takes time — though the air tunnel shortens it considerably. The pay-off is heat that lasts far longer once it's there.

Yes, and this heater rewards it more than most. With 330 lbs of hot stone the steam response is substantial. 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, adjustable legs, the pre-installed HIVE air tunnel, 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 and the air tunnel clear — restricted airflow is the main cause of early element failure.

Yes — it carries a one-year commercial warranty, and the stone mass suits frequent duty cycles well. If it's going into a gym, spa or hotel, tell us; we handle those projects regularly.

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, covering 354 to 566 cubic feet against this one's 283 to 460, and drawing 43.75 amps against 37.5. Same body, same 330 lbs of stone. If your room is under 460 cubic feet, this 9 kW is the right choice and cheaper to wire.

One step down, covering 177 to 318 cubic feet at 25 amps. Same body, same stone. Overlap runs from 283 to 318 cubic feet — in that band either works, and the 6 kW is cheaper both to buy and to wire.

Same output, both floor-standing. The CLIFF is tall and slim with 165 lbs of stone and exceptionally tight clearances. The HIVE Mini is a wider cylinder with twice the stone. If clearances are tight, CLIFF; if you want the softest possible heat and have the floor space, HIVE Mini.

Same output, very different heaters. The DROP is wall-mounted, carries 122 lbs of stone, ships parcel rather than freight, and costs roughly $900 less. The HIVE Mini carries nearly three times the stone for a longer, milder heat. If budget matters, DROP; if heat quality is the priority, HIVE Mini.

No. Oversizing means a bigger circuit, a bigger installation cost, and a sauna that short-cycles and never develops proper steam. Since every HIVE Mini carries the same stone mass, going up in output gains you nothing but room capacity.

By LTL freight rather than parcel. That means a delivery appointment and a truck at kerbside rather than a courier at the door. The 330 lbs of stone ships separately and is a significant freight item on its own — 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 the air tunnel clear, 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, 330 lbs of stone and a substantial 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 needing ten boxes of stone, a controller, a 37.5 amp circuit and a floor that can carry 370 lbs, having someone confirm the whole picture 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.