You're right on those flowrates.
Originally posted by mark115
Should I start a new thread?
The Buderus installation manuals are available on line. There is a Pressure drop diagram, but it is not referenced in the dialogue. For G234, 17.6 GPM seems to be important. (It's the only mid-point value shown.) For G124, 10 GPM is the only point shown, but since the diagram uses a log scale, I'm not sure that it has any real significance other than reference.
Max operating pressure for both models is 58psi.