It is listed as a 150. It was a demo that had an over sized pump. No recirc pump as your should have. The original pump went part way thru the first season and they installed the pump for a larger unit in the machine.

An 8" would be the way to go if redoing the entire unit...vessel and membranes. I would be interested in the vessels you have. The old vessels and membranes disappeared and I just put in two xle 4040 with vessels....oops. Eight" would have been cheaper and better sized to the pumps in the machine.

We were not as serious about making syrup two years ago as we are now. It may be a large part of our farm operation when the oldest and is girl get back from college in 3 years. At college they went to a sugar maker on a school ag business trip and ended up sharing ideas and impressed the professor with their experience. We have 3 4000 gallon storage tanks we don't use in the liquid feed business any longer and a 2000 gallon stainless truck that is seldom used; that will work well for hauling sap.