I recently read a thread on the BWS Forum about increasing the length of time between adding water to the water pan so I decided to try this method this past weekend when I would be cooking for 6 hours. Before filling the water pan place chunk of wood in the pan, place a foil wrapped rack on top of the pan with a hole in the center. The piece of wood acts as a heat sink and does a heck of a job. I still had plenty of water remaining and could have run a couple more hours easily at 235-250.