Agree with above. No water in pan (but keep it in as a heat shield and drip pan).
It takes some serious coal to get a 22.5 up to those temps but they will last once your there.
Weber WSM, Weber GA, Weber Spirit S-320
Charbroil Oilless Turkey Fryer
Wife LuzziAnn 1956 model.
Maverick ET-732, Superfast LSU Purple Thermapen, Party Q