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Posted by jude wolf on June 20, 2011 at 22:09:21:
In Reply to: Re: glowing Morrison tube posted by Anh on March 27, 2009 at 12:22:55:
If you have carbon (soot) buildup on the morrison tube (which is not good), it may glow during firing and afterwards for some duration. The actual metal of your boiler should NEVER glow. If it were to do so, it would suggest that you have no water circulation on the backside of the metal and is a very dangerous situation.
I would have a service person look at the unit as soon as possible.