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Reference.org
Catalytic heater
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<p>A catalytic heater is a flameless <a href="/facts/Heater/gm1UQdR6">heater</a> which relies on <a href="/facts/Catalysis/LPBS7TQC">catalyzed</a> chemical reactions to break down <a href="/facts/Molecule/N9ljSfFq">molecules</a> and produce calefaction (heat). When the catalyst, fuel (e.g., natural gas), and oxygen combine together, they react at a low enough temperature that a flame is not produced. This process keeps repeating itself until either oxygen or the fuel source is taken out of the equation. </p>