Quote Originally Posted by Brian View Post
(I forgot this)The sugar in the sap changes the boiling point of the sap, the pure the water the higher the boiling point.

That's how I see it Brian. You would have to know if the original poster was boiling raw sap, or concentrated sap, in order to come up with a GPH rate. Also, all the considerations berkshires brought up. I have a flat pan and baby sit it, running 1" depth. I also added a blower 2 years ago. That blower made a huge difference in GPH. I also preheat the sap, so the actual boil never stops. I'm never introducing cold sap to the pan. 2 years ago I was running a 3" depth in the pan, until a friend stopped by and told me to try less sap, but keep on top of it. So many variables, going from 3" of sap with no blower, to adding a blower, to going to a 1" depth, changed my GPH for the better at each change in methods.