Description
The M series is the plain, honest Harvia — the one that has been in Finnish saunas for decades and still outsells most of what came after. No water tank, no glass theatre, just a firebox and a stone bed that heats a small room quickly.
Exterior feed (SL). The stove sits in the sauna but the firebox opens through the wall, so wood goes in from the next room — no ash, no bark and no cold draught in the hot room, and the fire warms both spaces. It has to be designed in before the wall is built.
Sizing: 16.5 kW, rated by Harvia for sauna rooms of 212–459 cu ft. Measure the room, not the bench.
Stones: choose above. Harvia’s minimum for this stove is 2 boxes of the 4–6 in fraction. Pick Included and they travel on the same pallet as the stove; pick Not included if you already have stone or would rather source it locally.
The minimum is a minimum, not a suggestion — an under-filled stove runs hot and loud and gives thin steam. If you are stacking it yourself, order one spare box of AC3020: natural stone varies in shape, and the spare is what lets you sort for a loose, well-packed pile.
Chimney: a wood-burning stove needs a UL-listed class-A chimney sized to its flue collar, installed to local code. We do not supply Harvia flue parts — plan that with your installer before the stove arrives.
Specifications
- Power: 16.5 KW
- Fuel: wood
- Room size: 212–459 CF
- Max firewood length: 13.7″
- Dimensions: 15.3″W × 25″D × 28″H
- Weight: 105.8 lb
- Minimum ceiling height: 75.4″
Frequently asked questions
Does the Harvia M3 SL need electricity?
No — it is a wood-burning stove. It needs a chimney connection, but no wiring and no electric control.
What size sauna does it suit?
Rooms from 212 to 459 CF cubic feet.
Do I need to buy anything else?
Yes — 2 boxes of sauna stones (add them in the option above, or source them locally) and a compatible chimney/flue.
What each option includes
- Add 2 boxes (4–6 in) — +$138 — 2 boxes of Harvia AC3020 olivine diabase, 4–6 in, 44 lb each — the charge Harvia specifies for this stove, shipped on the same pallet.
- Not included — Stove only. This stove needs stones to run — see the note in the description.
