Depending on the heating equipment installed in your home, wispy white smoke could be a normal byproduct of operation. The smoke can also be an indication of a fuel problem if your home heating equipment burns oil. A licensed technician can help you determine if the source of the smoke is normal combustion or an issue requiring immediate attention.
It's common for a gas heater to smoke when you start it for the first time in the season, and the smoke usually dissipates quickly as debris is incinerated. If you want to prevent this, blow off
A puffback is a release of smoke or soot that occurs when a boiler or furnace misfires. It is important that adjusters and insurance carriers understand what a puffback is and what causes one to occur. Not only are they expensive (and occasionally dangerous), …
A small amount of white smoke is normal, but black or dark smoke coming from your boiler is a sign of a potentially serious problem. You should call a certified repair technician immediately, as
Causes of Black Smoke in a Boiler | Home Guides | SF Gate
The presence of black smoke in natural gas fired boilers indicates that the fuel-air mixture is much too rich, and there isn't enough excess air, or oxygen for complete combustion. Carbon starts building up, and the flue exhaust will start producing carbon monoxide, so this should be avoided.
Modern gas boilers are "condensing boilers" and are designed to extract as much energy from the flame as possible by condensing the steam formed into liquid water. Some of this water is the cloud of "smoke" you see coming out of the flu. The rest of the water goes down a condensate drain which leads it from the boiler to the outside somewhere.
Smoke from Next Door's Gas Boiler | Askaboutmoney.com
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