A water pan helps stabilize the temperature inside the smoker. This isn't much of a problem for electric smokers, but pellet and fire smokers aren't as consistent in holding a reliable temperature. Since the water becomes hot in the smoker, it helps keep the temperature stable, especially when adding more fuel. The water pan also blocks direct fire from scorching the meat. When smoking bacon in an electric smoker, you don't need a water pan. If you're using a pellet or fire smoker, use the water pan to keep the temperature consistent.