The Thermostat uses a bimetallic strip to break the circuit when the desired temperature is reached. This is a strip made up of two metals that have different thermal expansion characteristics, such as steel and copper. If one metal expands faster than the other, the strip will warp -- and the motion caused by this warping can do useful work (like breaking the circuit...) In this case, a cam exerts some force on the bimetallic strip using a spring force to keep the contact in place for varying amounts of temperature. For "high" settings, the bimetallic strip must warp a lot more to break the contact than for "low" settings.
My engineering instinct tells me to stick to what is simple, which led me to this cute little snapper. THIS WAFFLE IRON IS AMAZING. I have only made three waffles on it so far, but IT MADE PERFECT GOLDEN, CRISPY WAFFLES WITH HOT, STEAMY FLUFF ON THE INSIDE. And it required no cleaning! And it stores upright nicely! And … And … And … I have decided, unless you run a professional kitchen or feed a family of 13 waffles every day, you do not need to pay any more money for a professional waffle iron that ‘flips’ or ‘shoots flames out its behind.’ This waffle iron is inexpensive, but I have no regrets. This iron does exactly what I want it to do. And that is to make perfect waffles.”
Finally, be aware that if you're getting so-so results from a waffle maker that usually draws rave reviews, the problem might be your batter instead of the machine. Users who substitute pancake batter for waffle batter quickly find out that there is, indeed, a difference between the two. Pancake batter in a waffle iron generally produces a heavy, dense mess that'll stick to the waffle iron like glue, and users warn that some "waffle recipes" found on the back of pancake mix boxes don't do much better. If you're into creative pancake making, you'll do better cooking them on a stovetop skillet or electric skillet, both of which we cover in separate reports.
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.
American waffles[71] vary significantly. Generally denser and thinner than the Belgian waffle, they are often made from a batter leavened with baking powder, which is sometimes mixed with pecans, chocolate drops or berries and may be round, square, or rectangular in shape. Like American pancakes they are usually served as a sweet breakfast food, topped with butter and maple syrup, bacon, and other fruit syrups, honey, or powdered sugar. They are also found in many different savory dishes, such as fried chicken and waffles or topped with kidney stew.[72] They may also be served as desserts, topped with ice cream and various other toppings. A large chain (over 2,100 locations) of waffle specialty diners, Waffle House, is ubiquitous in the southern United States.
The machine works fine, but there are lots of nooks and crannies that are difficult to clean. And the noise to tell you a waffle is "done" is horrific. It's an emergency alarm type sound so every time we use it, the sound nearly sends me running out of the house with my child thinking something awful is happening. I never get used to it. And to top it off, the alert timing is wrong so it serves no functional purpose. If it had no alarm or one that could be disabled, the rating would be 4 stars. 

We rigorously tested the top 12 models ranging in price from $20 to $125 (at the time of testing) to find you the ones that consistently make the best waffles—ones that are crisp and golden on the outside while still fluffy and moist on the inside, ready to mop up country gravy, runny yolks, or warm maple syrup. We want waffle irons that reheat quickly so you can feed a crowd. We also want ones that are easy to clean, store, and operate. Because waffle irons are bonus, luxury appliances, we’ve found winners that we’re confident are worth the splurge (and counter space)—tools you’ll want to reach for any time of day. For those who don’t want to spend a lot, we’ve also picked our favorite budget models; they don’t work quite as well, but, with bonus features like removable plates for easy cleaning, we think they’re worth considering.
That said, quite a few users say that this waffle maker isn't as sturdily built as previous versions of the same model, and that if you don't get the top heating plate aligned just right, it can fall off -- an injury hazard if the plate is hot. The top of the G48TD also gets very hot. Some use pliers to bend the metal clips that hold the heating plates in place, which helps them line up better -- or you can just use an oven mitt to protect your hands.