| http://www.w3.org/ns/prov#value | - The primary source of energy in a heating boiler is the combustion of a fossil fuel coal, oil, or gas or waste materials The use of peat, garbage, sawdust, petroleum coke, and other waste products is increasing, but it is still a small fraction of the total fuel burned in this country Combustion is a process of burning combining the fuel with oxygen and igniting the mixture The result is heat rele
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