Harvia Wood Burning Heater Packages

Why Buy the Package Instead of the Bare Stove

A wood-burning sauna stove is only half the install. The other half is everything that makes it safe to run — the chimney, the heat shield between the stove and the wall, the floor protection under it, and the stones in the basket. Source those piece by piece and you're cross-referencing part numbers across four product pages, hoping the flue diameter matches the stove and the sheath fits your model. These kits remove that guesswork.

Each Harvia wood-burning package here ships as a complete kit: the stove, a matched chimney, the protective sheath, floor protection, and a pre-measured load of stones. One order, parts that are guaranteed to fit each other, and it lands cheaper than buying the same components separately. If you'd rather start from the bare unit — or you want a model that isn't bundled here, like the Legend or GreenFlame lines — the full Harvia wood-burning heater range has every stove on its own. For most first builds, though, the bundled kit is the cleaner order.

The Packages, by Model

This collection runs lean and practical — two stove platforms, three bundles, covering small-to-mid rooms up through big outdoor cabins. Here's how they sort out.

The Harvia M3 (16.5kW) is the compact workhorse and the value entry to wood-burning. It heats roughly 212–459 cu ft — call it a 2–4 person sauna — carries about 66 lbs of stones, and takes a log up to roughly 13.7 inches. It ships in two configurations: the standard M3 kit with chimney, sheath, floor protection, and stones, and the M3 kit with chimney extension, which adds a 500mm flue section (and a heavier ~88 lb stone load) for taller ceilings or a longer run to the roof. If your sauna is a standard-height room, the standard M3 kit is enough; reach for the extension version when your ceiling or roofline needs the extra pipe.

The Harvia PRO 20 (24kW) is the big-room stove. It covers roughly 353–706 cu ft — a large 5–8 person outdoor sauna or a high-ceiling cabin — and ships complete with chimney, sheath, floor protection, and stones, the same all-in-one bundle as the M3, just scaled up for a room the M3 would never get to temperature. If you're building a generous outdoor sauna and want a real fire, the PRO 20 kit is the one to look at.

Both stoves are interior-feed: you load wood from inside the hot room. If you specifically want a through-the-wall feed so the loading door faces a porch or changing area, those individual Harvia stoves live in the broader wood stove collection rather than these pre-built kits.

Wood-Burning Means No Wiring

This is the whole reason people choose wood. A Harvia wood-burning stove needs no electrical service — no dedicated 240V circuit, no breaker, no controller, no electrician for the heater itself. That makes it the answer for an off-grid cabin, a lakeside sauna with no power run, or anyone who just wants the crackle and ritual of a real fire instead of tapping a phone app.

What wood asks of you instead is a proper chimney. The flue has to run correctly out of the building, and the stove needs the right clearances to combustibles — which is exactly why these kits bundle the sheath (the heat shield that protects nearby walls) and the floor protection (the non-combustible base under the stove). Chimney and clearance requirements vary by local code, so confirm the specifics for your build with a qualified professional before you fire it for the first time. If you'd rather skip fire-tending entirely and run on a circuit, the Harvia electric heater packages bundle a controller and stones the same way these bundle a chimney.

Sizing Your Stove to the Room

Wood stoves are matched to room volume the same way electric heaters are — find the stove whose rated cubic-foot range covers your sauna's interior, and size up when you're on the line. Across these two platforms the coverage runs from about 212 cu ft on the small end up to 706 cu ft on the large end:

• 200–460 cu ft (2–4 person): Harvia M3 16.5kW kit (standard, or the chimney-extension version for taller ceilings)
• 460–706 cu ft (5–8 person / large outdoor): Harvia PRO 20 24kW kit

When you're between sizes, size up. Glass doors, tile, cold exterior walls, and an outdoor build with no surrounding heat all pull effective capacity down, and an undersized stove never quite gets a big room to a proper Finnish löyly. An oversized stove just gets you there faster and idles down.

What's in Each Package

Every bundle in this collection includes four things beyond the stove itself:

• Chimney — the flue components to vent the stove (the M3 extension kit adds a 500mm section for longer runs).
• Protective sheath — the heat shield that lets the stove sit closer to combustible walls within Harvia's clearance spec.
• Floor protection — the non-combustible base the stove stands on.
• Stones — a pre-measured load (about 66 lbs on the M3, up to ~88 lbs on the PRO 20 and M3-extension kits) sized to the stove's basket.

What you'll still want on hand for opening day: dry, properly seasoned firewood cut to the stove's log length, a water bucket and ladle for steam, and any additional clearance shielding your local code calls for. If you ever want to top up or refresh the stones — they do break down over years of thermal cycling — replacements live in our sauna stone collection. And if you're still building the room itself, the outdoor wood-burning sauna kits pair naturally with these stoves.

How Harvia Wood Compares

Founded in 1950, Harvia is the most widely installed sauna brand in the world, and its wood-burning line carries the same reputation as its electric heaters: robust, proven, and built for a hot, fast, traditional Finnish löyly. A wood fire takes a bit of patience up front — figure roughly 45–60 minutes to get a room to temperature once the fire is established, versus the 30–45 minutes a Harvia electric heater needs — but that's the trade for going off-grid and skipping the power run entirely. If you want to weigh Harvia against other wood brands side by side, the full wood-burning sauna heaters category lays out where it sits, and the HUUM wood-burning packages are the closest competing bundles if you're cross-shopping on design and stone mass.

How to Choose

It's a short decision tree with wood. First, room volume — M3 for 200–460 cu ft, PRO 20 for the big 460–706 cu ft rooms, sizing up if you're on the line. Second, your ceiling and roofline — standard M3 kit for a normal-height room, the M3 chimney-extension kit when you need a longer flue run. Third, confirm your build can take a proper chimney with code-compliant clearances, since that's the one real demand wood makes that electric doesn't. Get those right and the kit handles the rest.

Harvia's warranty is valid only through authorized dealers like Topture — grey-market stoves from third-party resellers often aren't covered even when the box looks identical. We're an authorized Harvia dealer, ship every package free, and our team is on the phone if you hit a question on sizing, chimney configuration, or clearances while you're planning the build. We'd rather size it right with you than have you guess.