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.
Most modern waffle makers run on electricity and can be adjusted to produce lighter or darker waffles. Many, but not all, have indicator lights and audible beeps to cue you through the preheating, battering and cooking stages. Even more important, the waffle maker should maintain consistent, even heat to make sure your waffle isn't overcooked on the outside and mushy on the inside, or cooked in some places but not in others.
The instructions say to warm up the waffle iron on heat setting 7, but there is no heat setting 7. The waffle iron has a knob on top numbered 1 through 6. I can't actually rotate the knob to numbers 5 and 6 though; the knob is physically stopped from rotating at 4. When I rotate the knob the other direction, I can rotate past 1 almost a full 360 degrees (stopping just before I reach 6 from the opposite side). The iron seems to heat up as soon as it's plugged in regardless of how the knob is rotated, so as far as I can tell there is no "off" setting even if I've rotated the knob to well below 1. Since I can't tell how the knob actually maps to heat settings (if the knob even does anything at all) I'm afraid to even try actually poring waffle batter onto the thing..
When the temperature exceeds the desired setting, the strip "warps" and breaks the contact causing the resistance coils to cool. Because the iron is not being heated, the temperature falls and consequently the bimetallic strip "un-warps" and makes contact again, causing the coils to re-heat the iron. In this way, a continuous temperature is maintained in the cooking irons.
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. 
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