why gas fireplaces have long orange flames while gas stoves have very short blue flames.
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Because gas fireplaces are not intended to be an efficient source of heat, they are made to replicate the appearance of a wood fire.
A blue flame means the gas is being burned efficiently with the correct fuel-to-oxygen ratio. A yellow flame means there is too much fuel and not enough oxygen, so the fuel does not burn completely. Some particles of carbon remain, which incandesce, glow yellow, and are released as soot and smoke.
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