Hardwood or softwood pellet ? Which is better ? Test of pellets combustion in one automatic stove

Pellets are popular renwables across the world. It is eco friendly bio fuel used in domestic and industrial boilers and burners.
Quality of pellet is popular problem. Fuel can be made from many different raw materials and sources. We test in the same heating furniture - pellets stove two type of granulate: softwood and hardwood from oak.
Can you see the difference ?
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