You can keep waffles from becoming soggy by placing them in a pan and putting them in an oven set a 200 F and leave the pan uncovered for at least 20 minutes.
After 20 minutes in the oven the pancakes can start to dry out so don't leave the pancakes in the oven longer than 20 minutes.
The warm oven will keep the pancakes hot enough to melt the butter but will also prevent the pancakes from becoming soggy.