Description
The Pro series is built for hard, repeated use — a big stone compartment and a firebox sized for real löyly rather than a token puff. This is what goes into a family sauna that gets used every week and into light commercial rooms.
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: 24.1 kW, rated by Harvia for sauna rooms of 283–706 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: 24.1 KW
- Fuel: wood
- Room size: 283–706 CF
- Max firewood length: 13.7″
- Dimensions: 17″W × 28.7″D × 30″H
- Weight: 137.8
- Minimum ceiling height: 81.1″
Frequently asked questions
Does the Harvia PRO 20 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 283 to 706 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.
