Electric waffle irons are available in flip and stationary models. Proponents of flip waffle makers suggest that they heat more evenly by better distributing the batter throughout the plates. After testing both styles with different batters to see if this was truly a useful feature, we found that our three high-end picks cooked all the batters on the top and the bottom evenly. There was no difference between our flip model and a high-end stationary model. We did, however, find the flip a useful function when comparing lower-end models cooking the thinner buttermilk batter. Ultimately, we didn't pick any low-end flip models because, although they may have heated more evenly than our budget picks, they cooked the batter so slowly that the waffles ended up too dense and heavy.
Today there are many (many!) Belgian waffle makers on the market. We set out to find the best one by making hundreds of waffles and by going the extra waffle-making mile by consulting a postdoc in MIT’s mechanical engineering program to learn the basic thermodynamic principles at work in waffle irons. After a month of waffles for breakfast and for lunch, we had a solid winner—an iron that made picture-perfect Belgian waffles, two at a time, in under 5 minutes.