You will like the difference yeast makes in waffles; they are absolutely delicious! Make them ahead and then experience the convenience of having the batter prepared and ready for the waffle iron just before you are ready to serve.
Combine flour, yeast, sugar and salt in stand mixer bowl; set aside. Combine milk, water, and oil; heat to 120° to 130°F. Add milk mixture to flour mixture; blend on low speed using a paddle attachment. Add eggs. Beat 2 to 3 minutes on medium speed. Cover bowl; refrigerate batter several hours or overnight.
When ready to serve, stir down batter. If refrigerated, let sit out for 30 minutes prior to baking. Preheat waffle iron to medium/high heat (and grease if needed). Pour batter on waffle iron as directed by manufacturer. Serve hot with butter and syrup, or your favorite toppings.