A catalytic heater is a flameless heat source that uses chemical reactions to break down molecules and generate heat. In the presence of a catalyst which is within the heater, counter-current combustion or catalytic combustion occurs when natural gas (or liquid propane gas) in the presence of oxygen creates carbon dioxide, water, and heat. In this situation, the ignition temperature of natural gas occurs at significantly lower temperatures; therefore, no flame is involved in the combustion process and far-infrared wave emitters are created, producing radiant heat. Once the oxidation begins, the reaction and heating continue until either the oxygen or fuel source are eliminated. The thermal efficiency of catalytic heating is also significantly higher than normal heating.