I am confused too! I do have Bill's 2x4 with a blower standard flat pan and when I bought mine two years ago I had him modify it so preheat sat over the elbow. At the time he did not have that new pan. Are you saying that pan will produce over 20 gal per hour evaporation without a blower? If so I am going to upgrade my pan. I currently get about 15gal per hour with blower at half throttle if I run it wide open in short burst I can get 17 but if I leave it running wide open the stack starts to melt down.
110 taps W.F Mason 2x3 and two turkey friers for finishing
2011 expanding to a Mason 2x4 with a blower increasing taps to about 200
2011 Hurricane Irene rips thru my small sugar bush cost me to lose 20% of taps
2014 I have reworked my lines for 2014
32 taps on 5/16 line with check valves
57 taps on 3/16 line with check valves
55 buckets with total tapped trees of 144