Paraffin heaters and carbon monoxide

ANy flame-based heater that is producing a yellow flame is suspect; it means that the flame is too cool for complete combustion. And unless it's a balanced flue, even a heater with a chimney can leak exhaust gases back into the cabin if conditions are wrong.

Yellow flame can also indicate incomplete combustion due to lack of air. Those are the precise conditions that can create copious amounts of CO. Yellow tips on blue flame are less of an issue.
 
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