This study presents the experimental results on CO emissions and performance analysis obtained from two commercially available Belgian made modern wood stoves with capacity of 10 kW and 20 kW nominal heat output. Four batches in the 10 kW stove and six batches in the 20 kW stove were performed. The gaseous emissions of CO, CO 2 and O 2 were continuously measured during the combustion tests. The CO emissions during the startup phase were significant and about 4 times higher than combustion phase

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... of the 10 kW stove and 3 times higher than the 20 kW stove. The total CO emissions from all the batches varied from 447 to 1185 mg/Nm 3 for the 10 kW stove and 958 to 1545 mg/Nm 3 for the 20 kW stove. The combustion efficiency obtained from all the batches was 79.5±0.7 % for the 10 kW stove and 77.1±1.2 % for the 20 kW stove. The results show that the total CO emissions from all batches of both stoves (with exception for the Batch 1 of 20 kW) satisfied the limit value of the NBN EN 13229 standard, while the combustion efficiency from both stoves satisfied the limit of the standard. The results of CO emissions and combustion efficiency from this study could be useful for the improvement of the combustion process to reduce emissions from these devices.