Daren,
I currently am boiling on a 18X66 Lapierre drop flue evaporator, I have forced draft on it and last year with good dry wood I was getting about 15gals/hour. I am planning to try and add a steam hood and preheater and hope to get upwards of 18gal/hr. My advise, if you plan to ever get to the 150 tap mark go with a 2X6, they have a bigger firebox, more evaporation rate and a host of other advantages for a minimal price jump. I am still kicking myself for not spending the extra money to get a 2x6. The Lapierre is a nice little rig for 75 -100 taps but much more and one will be spending alot of time tending the fire and some long nights, but hey its a short season and we all anxiously can't wait for it start and then equally look forward to end after several big runs !
NEIL
18x66 LAPIERRE EVAPORATOR, 120 TAPS GIVE OR TAKE
10x20 SUGAR SHACK