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Posted by John Cockerill on September 11, 2009 at 00:49:05:
I need help to fully understand the facts frm the myth about boiler condensation. I'll start with some comments that can be affirmed corrected or challenged. I am sure I am not the only idiot in the world and someone else may benefit as well from the conversation. I read conflicting testimony on the subject and ask my collegues for some good facts. Remember thst "wisdom is knowing what we don't know and having the courage to ask a question.
1. I here that condensation occurs at 130F. for Oil and 137 F for natural gas.
2. If a boiler starts to fire the temperature of the fire is much higher than that. Surely the fire side of the boiler chamber is above 130F before any considerable condensation starts to happen.
3. It would seem to me that the only time considerable condensation could occur is when the boiler goes off on adjusted high limit and the waterside is still below 140 degrees.
4. Surely it takes a boiler in a resting state to start up will be handling water well below 140F as the system heats. You know those fall and spring days when the system has been off all day and starts up in the chilly evening?
5. Boilers set at 180F high limit have cold water coming back due to short circulation when the thermostat is satisfied and the heat is half way around the house. It would see these high limit settings would be setting the system up for thermal shock from High delta temperature, and some cool parts of the heat exchanger?
6. Help me understand the principles and there relationship a bit better. As Dan H. says, we ned to see the water. I ned to dsee the water a little more clearly here.
Thank you.