Seems most of the great cooks here use the 18 wsm. But I have the new 22.5 wsm. After reading this forum, I have not put water in my pan for the last two cooks with some suceccs. I have even head that people have had trouble keeping temps down in the zone on the 22.5. However I have found the exact oppisite. As discussed on this forum, the hood thermomerter is about 50-80 degrees cooler than the acutal temps. I have also used a full chimniy and then added coals to fill the ring to use the minion method and I still cannot achive temps over 300 degrees. These temps woul be used on chicken, high heat brisket or the like. I have about 6 cooks on my wsm and I am only batting about 30 percent. I woul love to hear other opinions especially cooks with a 22.5 and how they have overcome this 300 degree threshold.