Thanks PC Farms for the detailed explanations. That's impressive that you can get to that high a brix on your evap. without burning the syrup. I assume you're using oil and the low fire setting? Any idea what the temp. under the pans and the stack temp is? And when you say you are using a batch process, are you just adding concentrate to the syrup pans until it is all the desired brix for syrup? Then you filter and pack it?

And when you say you used a water jacketed canner, you were just batching in that while adding concentrate?

I follow a couple birch forums and there seems to be a wide range of techniques people are using to boil birch. It seems there is a fine line between the slow boil/simmering camp and the fast boiling camp. I would like to figure out a method using my wood fired rig to boil 10-12% concentrate to syrup. Your idea of using just the syrup pans is pretty intriguing.

This is a whole different scale and concept but I have found this video pretty interesting... They are also using ultra filtration but boil with steam.

https://www.youtube.com/watch?v=nXMXAphs6vM