The burning time of pellet fuel is only 1/2~2/3 of coal. The dosage must be bigger. Then, what’s the economic benefit of wood pellets when compared with coal?

If the combustion time of wood pellets is half of the coal, it is true that the usage amount will be doubled at the same time. But the total quantity of heat is also doubled. It means the heat generated per unit time is doubled. Combustion efficiency is measured by the price of per unit calorific value, rather than burning time.