I am very happy with the Belgium waffle maker.  I used this suggested recipe for the mix I use all the time - (Members Mark). 
According to the instructions on the bag, it's 2 cups of the mix to 1 1/2 cups of water plus 2 tablespoons of oil. 
Another customer mentioned “they made waffles without using the oil but they cook better if you add the oil. If you don't use the oil, they stick to the waffle maker.”
Waffles were perfect and didn’t stick.