HUUM Wood Burning Sauna Stove

What Makes a Wood-Burning Sauna Stove Different

A wood-burning sauna stove heats the same way the original Finnish saunas did for centuries: you light a fire, the firebox heats a mass of stones above it, and you throw water on those stones for steam. No 240V circuit. No breaker. No electrician for the heater itself. That's the whole appeal, and it's why people building off-grid cabins, lakeside saunas, or any spot where running power is expensive keep coming back to wood.

HUUM makes two wood-stove families — HIVE Wood and HIVE Flow — and both carry the open cage-of-stone design HUUM is known for. The open construction is the point: it lets the stove hold hundreds of pounds of rocks, and more stone mass means softer, longer-lasting heat and far better löyly when you pour water. This collection has both the bare stoves and the complete packages that bundle a matched chimney kit. If you'd rather skip the fire-tending and you have power, the full HUUM electric sauna heater range sits right alongside these.

The HIVE Wood and HIVE Flow Series, Explained

HUUM's two wood lines are built around different priorities. They're not "good vs. better" — they're two different heat characters.

HIVE Wood Series

The HIVE Wood series is the wood-burning version of HUUM's iconic HIVE cylinder — the same cage-of-stone silhouette, in 13kW and 17kW. The 13kW covers roughly 212–459 cu ft and holds 199 lbs of stone; the 17kW covers 283–565 cu ft and holds 287 lbs. This is the high-output option with the classic look — pick it when you want maximum raw heat for a bigger room and the recognizable HIVE shape. If you want that same cage-of-stone look on a circuit instead of a fire, the electric HIVE heater covers the bigger electric rooms.

HIVE Flow Series

The HIVE Flow series is HUUM's newer wood line, with a taller body (about 34.8" high) and the key difference: a bigger stone mass at a lower kW rating. The Flow 9.8kW carries 330 lbs of stone — more than either HIVE Wood — and covers 282–635 cu ft, the widest range in the lineup. The Flow Mini 8.5kW carries 231 lbs and covers 212–494 cu ft. More stone mass at a lower wattage means a gentler, more sustained heat curve and softer steam. Pick Flow for the best löyly-per-kW and a more even, stone-driven heat.

Interior Feed vs. LS (Through-the-Wall) Feed

Most of these stoves come in two feed styles, and which one you pick is a build decision you make before the walls go up. The standard version loads from inside the sauna — open the door, add a log, close it, all from the hot room. The LS version feeds through the wall: the firebox door sits on the outside of the sauna, so you load wood from an adjacent room, a porch, or the changing area without bringing cold air, bark, and ash into the bathing space.

LS is the move when you don't want to tend the fire from inside the hot room — common in outdoor cabins where the loading door faces a covered porch. This collection carries the LS versions of both Flow stoves (HIVE Flow LS 9.8kW, HIVE Flow Mini LS 8.5kW) and the HIVE Wood LS 17kW. Decide interior vs. LS early, because it changes how you frame the wall and the depth of the stove (the LS firebox extends farther — about 29" deep on the Flow LS versus 24.8" on the standard Flow).

Sizing the Stove to Your Room

Wood stoves are sized to room volume the same way electric heaters are — match the stove's rated cubic-foot range to your sauna's interior volume. Across this collection the coverage runs from about 212 cu ft on the small end up to 635 cu ft on the large end, so there's a stove for everything from a compact 2–3 person room to a big outdoor cabin.

• HIVE Flow Mini 8.5kW — 212–494 cu ft, 231 lbs of stone, takes a 12" log. The smallest of the group and the easiest to feed.
• HIVE Wood 13kW — 212–459 cu ft, 199 lbs of stone, takes about an 11.8" log. The compact classic-cylinder option.
• HIVE Wood 17kW — 283–565 cu ft, 287 lbs of stone, takes a 15.75" log. The hottest output in the lineup for big rooms.
• HIVE Flow 9.8kW — 282–635 cu ft, 330 lbs of stone, takes a 16" log. The biggest stone mass and the widest coverage of any HUUM wood stove.

When you're between two sizes, size up. Glass doors, tile, and cold exterior walls all pull effective capacity down, and an undersized stove never quite gets a big room to 180°F. The two we move most are the HIVE Flow 9.8kW stove for its stone mass and the HIVE Wood series stove for its output range across the 13kW and 17kW. Heat-up on a HUUM wood stove runs roughly 60–90 minutes once the fire is established — the trade-off for all that stone mass is that it takes longer to charge, then holds heat and throws steam far longer than a low-mass stove would. Plan for the warm-up; it's part of the ritual, not a flaw.

Bare Stove or Complete Package?

You'll see both in this collection. The bare stove is just the unit — right for builders who already have their chimney sorted or want to spec the flue separately. The HUUM wood-burning heater packages bundle the stove with a chimney kit in the roof or wall configuration you select (Thru-Wall, Thru-Wall Backside, Barrel, Thru-Flat or Curved Ceiling, or Thru-Angled Ceiling). For most first-time installs the package is the cleaner order, because a wood stove can't run safely without the right flue path for your specific roof or wall — and matching those components yourself is where buyers most often stall.

Stones are included where noted on the individual product. If your chosen package doesn't bundle them, you'll want the right volume of sauna stones sized for HUUM's open basket — the stone mass is what makes these stoves perform, so don't skimp there.

Chimney, Clearance, and Safe Installation

There's no wiring on a wood stove, so there's no electrician needed for the heater — but a wood stove does need a code-compliant chimney with proper clearances to combustibles. That's not optional. Each stove has a minimum distance to wood walls listed in its manual, and the flue needs the correct diameter, insulation, and roof or wall flashing for your build. A wood stove that's installed wrong is a fire risk, full stop.

Keep the area around the stove clear of towels, robes, and bench cushions, burn dry seasoned wood, and have a safe way to handle ash. Our sauna installation guide covers the planning side of an outdoor build, and you should always consult a licensed professional for chimney and clearance requirements, which vary by local code and can be stricter than the manufacturer minimum. If you're still planning the room around the stove, the outdoor wood-burning saunas collection shows complete builds these stoves drop into.

How to Choose

Work in this order. First, room volume — find the stove whose cu ft range covers your sauna, sizing up if you're on the line. Second, feed style — interior if you'll tend the fire from inside, LS if you want the loading door outside the hot room. Third, heat character — HIVE Wood for maximum output and the classic cylinder, HIVE Flow for the bigger stone mass and softer löyly. Fourth, bare stove or package — package if you still need a chimney kit matched to your roof or wall. Get those four right and the rest falls into place.

One brand note worth saying plainly: HUUM's warranty is valid only through authorized dealers. Grey-market stoves from third-party resellers often aren't covered even when the product looks identical. We're an authorized HUUM dealer, ship every stove and package free, and our team is available if you hit a question on sizing, feed style, or chimney configuration during your build. If you're cross-shopping the whole category, the broader wood-burning sauna heaters range shows where HUUM sits next to Harvia and the other brands we carry.