I'm considering adding a wort chiller type preheater to my barrel evaporator. It would consist of a new support rack for a 3 gallon SS stock pot filled with water adjacent the stack (for heat) and a wort chiller (50' coil of 3/8" SS tubing). I figure the water in the pot, heated by the stack, would transfer heat to the cold sap flowing through the coil submerged in the pot of water. When I run out of sap, the water will prevent the remaining sap in the coil from burning. The coil end would discharge directly into the pan.

It seems that the preheater pan, located adjacent the stack is a very common preheater type and I've seen the coil around the stack idea (and read of it's disadvantages), but have not seen or read of this wort chiller approach. I've searched the forum for wort chiller without finding much.

Any comments regarding this would be appreciated.