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???
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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