Jan 3, 2010 · Gas and Oil Home Heating Furnaces - steam or smoke coming from my chimney only - I was driving around today (it's cold) and noticed that everyone else's chimney in the area was not putting out any visible gas. Why is Smoke Coming from Your Chimney Without Fire? Yes, smoke can indeed come from your chimney even when there’s no fire blazing in the hearth. Before you start thinking your house is haunted or that some weird phenomenon is happening, take a deep breath. But if your system is burning and clear heat shimmer is all you see coming out of your chimney your fine. White or light gray smoke is usually associated with paper, straw, leaves, or wood. ‘Grey‘ is more commonly used in the UK, Ireland, and other places that use British English, although grey is also considered correct. Aug 22, 2025 · Chimney Obstructions Obstructions within the vertical exhaust structure itself impede the removal of combustion gases and can create back pressure, reducing the effective airflow through the system. Sometimes after I reload it's a bit thicker, but always whitish or very light gray. Complete combustion with minimised losses leads to optimised fuel consumption by the boiler. With any wood, large pieces on an ample bed of coals and adequate air will give the most even burns.

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