You better be careful having four evaporators in one building. Does your building have a metal roof? How are you running the chimneys? Are they single wall? When you boil sap its not like burning a wood stove or wood boiler. You are supposed to keep a rolling boil all the time. My stainless steel pipe will glow red, granted I have a blower and I am sure my temperature is around 1000+ degrees going up the chimney. I understand wanting to be out of the weather, you might want to consider everything before you put all of them into one building.
2004 - 2012 2x3 flat pan 25 to 60 taps
2012 2x3 new divided pan w/draw off 55 taps
2018 - didn't boil surgery - bought new evaporator
2019 new SML 2x4 raised flue high output evap. 65 taps
made 17 gal. syrup
2020 - only put out 53 taps - made 16.25 ga.l syrup
2021 - Didn't work out
2022 - 25 taps on bags / 8 taps on 3/16's line - late start