Indirect fired space heaters differ from direct fired units in that they separate the clean heated air and the exhaust combustion gases - sending the exhaust fumes upwards via the chimney and forcing the clean hot air out the front of the unit. Indirect fired models cost more than the direct design but the presence of the combustion chamber allows them to produce a completely clean output - unlike the direct fired models.
Click here to read how Indirect Heaters work.
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