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Hydrogen combustion produces only water vapor as a by-product, making it a clean energy source. The energy content of hydrogen is very high at about 120 MJ/kg.

Combustion properties include a clean burn with lower CO2 emissions than coal and oil. It has a high energy content, with methane ($CH_4$) having about 55 MJ/kg.

Oil combustion produces high amounts of $CO_2$ and sulfur compounds if it contains sulfur. The energy content of typical fuel oil can be around 42 MJ/kg.

Combustion properties can vary widely, but it generally produces more particulates and potential for slagging and fouling. The energy content of wood biomass is typically around 18 MJ/kg.