I built and used a barrel unit for two years with a 2x2 divided pan. I bricked it and added a small blower and got about 5gph with cut up pallets
I purchased a used mason 2x3 with blower and moved inside. Love the evaporator!! Still using pallets and splits from down trees on our property that are pretty dry. I'm getting about 8-9 gph if I realy push it and fire frequently We have 85 taps and have processed numerous gallons of sap over the last month. It's just a great well built unit! Very happy with what we purchased for the size of what we do.
If you want to tap more trees look around your town. I drive around and drool over the sugar maples I see that are not tapped
Also if you 30 taps are on slope set up a 3/16 tubing system and pull more sap from what you have
Either way you won't be disappointed with a W.Mason rig
Good luck!
1st Year Turkey Fryer Guru-10 taps and No Clue
2nd Year Warming Pans on a Barrel Unit-25 taps Still No Clue
3rd Year 2 X 3 Divided Pan on a NEW Homemade Barrel Unit-45 taps Starting To Learn
4th year (2017) Mason 2 X 3 Inside Small Shack-85 Taps I Think I'm Addicted!!