Don’t Put Out a Fire with Water. The abrupt creation of steam and ashes from pouring water on the fire can cause a dangerous situation. It can also crack the grill, making it unusable in the future. But we wouldn’t recommend using water to put out a fire on your grill. If you suddenly pour water on a burning grill, it can burn because of the abrupt production of steam and ashes in the grill. Dispensing water on a grill fire can also make the grill crack, making it unusable.