Possible myth about high efficiency boilers =$$$ to sellers?

Posted by guskz on August 7, 2006, 5:07 pm

Unless someone can properly explain why high 93% efficiency boilers
need outside air ventilation intake where as CAST IRON boiller (83%
efficient) don't need it:
I believe the only reason is to ****LOWER the flue gas temperature*****
and generate condensation which defeats the energy savings purpose
(meaning drawing hot air out versus drawing -10F cold air in = same
efficiency) since flue gas can only condensate below 130 to 120F???

Posted by HeatMan on August 8, 2006, 5:30 pm

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Oh, they both need the combustion air.

Posted by guskz on August 8, 2006, 6:32 pm

HeatMan wrote:
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Yes, but the cast iron boilers do not all come with outside air intake
vents (same size as chimney exhaust vent) where as I believe all high
efficiency condensation boilers do, and the only logical reason I see
is they need cold winter air to lower the gas flue temperature since
the gas flue only condensates below 130deg F (which should defeat any
efficiency gain..meaning efficiency same as cast iron in winter)?

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