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Buderus G115 Breech Draft Spec
I own a raised ranch in CT with a Buderus G115 w/Riello burner. It's a great unit and serves me well.
In reviewing specs in the installation manual, Buderus states, "After starting the burner, set breeching draft to -0.01 to -0.02 inches WC using a draft gauge.".
My service company is currently reading -0.043 draft, which he says is great because the exhaust gases are moving up the pipe faster and I won't have as much of a smell in the basement.
Can anyone explain why Buderus calls for the -0.01 to -0.02 spec? What issues does having a higher negative breech draft cause?
Thanks for your time.