IIRC it takes 1 calorie to raise 1 gram of water 1 centigrade, then it takes 70 calories to convert it to gas. Trying to get a pit much over 225 with a pot of water in it will take a ton of heat boiling the water. Same problem happens when you get damp charcoal. That said, if you are trying to go really low and slow - the water is a huge temp buffer when you are under it's boiling point.
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