<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:10pt"><div>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.</div><div><br></div><div>Brad Robinson</div><div><br></div></div></body></html>