I think 1.5 -2" inches in the syrup pan is an excellent place to start being that the evaporator is new. You can go lower once you get some experience and make sure everything works right. Obviously the lower you go in the front the faster it boils, but a lot can go wrong quick. It also really helps the first time to draw some off the front @ 210-212 and dump it in the back as it will help push it through rather than staying at same temp for a long time.