Narvi
Narvi Kuru wood-burning sauna stove
Narvi makes the Kuru wood stove in 4 versions for saunas of 283 ft³ to 706 ft³. Slide to your room size to see which one fits and how fast it heats.
Updated Oct 18, 2026
Output
not published
Rooms
283 ft³–706 ft³
Stones
77 lb–88 lb
Sizes
4
Which size fits your sauna?
Your room's effective volume
388 ft³
Best fit: 14
Work out your effective volumeEffective volume = inside volume, plus 1.2 m³ for every m² of glass, tile or stone; × 1.5 for solid log walls (Harvia's rule, used by most planners).
Sizes and specifications
| Model | Output | Room range | Stones | Heat-up | Firewood per session |
|---|---|---|---|---|---|
| Kuru 14 | – | 283 ft³–494 ft³ | 77 lb | 25–35 min | 8 lb |
| Kuru 14 Through-wallThrough-wall | – | 283 ft³–494 ft³ | 77 lb | 25–35 min | 8 lb |
| Kuru 20 | – | 353 ft³–706 ft³ | 88 lb | 20–30 min | 10 lb |
| Kuru 20 WT16 L water tank | – | 353 ft³–706 ft³ | 88 lb | 20–30 min | 10 lb |
Heat-up and cost are our heat model's estimate for each size in a room at the middle of its range: indoor, insulated walls, 68 °F around the sauna, heated to 176 °F, one hour of bathing, electricity at $0.18/kWh (United States average). The maker does not publish this stove's output; the heat-up times use a rough figure from its room range.
Where to see it
Prices and availability come from the shop or maker and change; their page is what counts. Shop offers are added as retailers join.
Sources
- narvi.fi/en/product/narvi-kuru/maker · read 2026-10-18
- narvi.fi/en/product/narvi-kuru-14-through-wall/maker · read 2026-10-18
- narvi.fi/en/product/narvi-kuru-wt/maker · read 2026-10-18
Other heaters for the same rooms
Questions and answers
What size sauna does the Narvi Kuru heat?
Narvi rates the sizes for these rooms: Kuru 14 283 ft³–494 ft³; Kuru 14 Through-wall 283 ft³–494 ft³; Kuru 20 353 ft³–706 ft³; Kuru 20 WT 353 ft³–706 ft³. Use your room's effective volume: add 1.2 m³ for every m² of glass, tile or stone, and multiply by 1.5 for solid log walls.
How long does the Narvi Kuru take to heat up?
In a well-insulated room at the middle of each size's range, our heat model gives about: Kuru 14 25–35 min; Kuru 14 Through-wall 25–35 min; Kuru 20 20–30 min; Kuru 20 WT 20–30 min to reach 176 °F. The maker does not publish the output, so treat these as rough; firing and wood make a big difference.
How many stones does the Narvi Kuru take?
As stated by Narvi: Kuru 14 77 lb; Kuru 14 Through-wall 77 lb; Kuru 20 88 lb; Kuru 20 WT 88 lb. Use the stone size the manual specifies and re-stack the stones at least once a year, replacing crumbled ones.