The efficiency of a wood stove indicates how effectively 1 kg of wood is burned in a stove. In other words, it shows what percentage of the energy released during combustion is converted into heating the stove and the surrounding space. All our wood stoves have an efficiency of approximately 80%, with the Kilo leading the way at an impressive 84.4%.
The efficiency of our wood stoves is measured according to the official EN13240 standard. Not all stoves undergo this certification. Other testing methods may indicate higher efficiency rates (sometimes exceeding 90%), which is common in gas or pellet stoves. This can create a misleading impression—don’t be deceived.
A wood stove with an efficiency above 90% is practically unburnable and even unsafe. At least 10% of the heat is needed to expel all smoke gases. Without this, the draft is insufficient, promoting creosote buildup in the chimney. This means the smoke gases reach the dew point inside the chimney, causing corrosive substances to condense and settle on the pipe walls.
Below is a schematic overview of the efficiency per stove in our HR wood stove collection:
| Stove | Efficiency (%) |
| Hymme | 80,1 |
| Lynne | 77,2 |
| Dayna | 81,1 |
| Stor | > 80 |
| Sorenne | 77,2 |
| Wald | 82,9 |
| Kilo | 84,4 |
| Lobbe | 80,9 |
| Lobbe Compact | 80,9 |
| Mats | >80 |
| Boxer Plus | >80 |
Efficiency is not the same as a stove’s power output. In our article on how much power a wood stove needs, you can learn which factors determine the right power level. Curious about all the specifications of the Leenders collection? Check out our HR wood stove collection.