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HVACTECH2 HVACTECH2 is offline
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Default Gas Furnace flame color & efficiency

On Fri, 23 Nov 2007 13:58:40 -0500, "RichK" wrote:

Hi All,

With heating season starting in my area, I was changing the filter. Started
the furnace to check the flame. Flame on all 3 burners are blue for about
1-1.5 inch, but above that they are yellow. Furnace is 20 years old Lenox.

Is there are efficiency problem with the flames as described above?

Thanks,


There is no way to tell without a combustion analyzer.