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Actually the WHT does not actually heat the water(sorry could not resist)just controls the temp by cutting the common side of power to the element. And it never touches the water it is mounted on the outside of the tank but the actual sensor is set off the mounting bracket(as it is pressure sensitive) to the tank so actually it is regulating by the air that comes off of the hot tank. The same as it would if it is used in a incubator, the very same way a wafer therm works. When mounted correctly a WHT works with the very same principles as a wafer.
Actually the WHT does not actually heat the water(sorry could not resist)just controls the temp by cutting the common side of power to the element. And it never touches the water it is mounted on the outside of the tank but the actual sensor is set off the mounting bracket(as it is pressure sensitive) to the tank so actually it is regulating by the air that comes off of the hot tank. The same as it would if it is used in a incubator, the very same way a wafer therm works. When mounted correctly a WHT works with the very same principles as a wafer.