Looking through the archive, I don't see much discussion on? condensing boiler curves.? Is there an example anywhere of how the variables for the Bi-quadratic in Ratio & T are calculated?? Independent-1 and Dependent seem to both be part load factors.? Independent-2 is the HWR temperature.? I have the efficiency's at various return temperatures and boiler load conditions, so I should be able to derive these values.? Thanks for any help.

Brad Robinson