I know nothing about make syrup but a large pan make warp with heat, may want thicker bottom on pan.
I have seen a pan that had ridges across the inside to help with strength and another with a dam that could be pulled where a section is used for the new sap, and another is used for finishing in the same pan. That looked pretty "sweet" as it had a finishing area with a spigot in a lower area for draining the almost finished sap to be taken to a stove for completion.
A simpler version of this:
http://www.ebay.com/itm/like/322676329620?chn=ps&dispItem=1-Mark
