Do not use containers that are intended for refrigeration because this will just melt once it is put inside the oven. An example of this is margarine or a butter tub. Chemicals present in this kind of container will just contaminate your food. Once the food to be reheated is now in the oven, do some constant stirring to even out the heat. You might have heard statements from neighbors and friends saying that microwaved food poses serious health risks, not to mention the ones caused by electromagnetic wave emissions issuing from the device. And then there are others who attest to the fact that these are pure myths or old wives' tales. It's difficult to come up with a final supposition due to the mixed opinions about the safety of microwaves. The reason for this is that the third party supplier might not have some microwave replacement parts you need and which can only be found at the manufacturer's website. If you can't go to the local stores to purchase replacement parts, online websites are your best option. Aside from the fact that they are available 24 hours a day, they usually have quality replacements parts too. The electromagnetic waves emitted by the machine have the capacity to go through ceramic, plastic, wood or glass via short waves and can permeate the food within minutes. As an additional perk, you can use an adjustable timer that allows you the luxury to set a time depending on the type of food that is to be cooked. By getting a built-in microwave, you no longer need to look for a space where you can put your model. Quality Though this kind of microwave comes more expensive, its quality is usually better than stand-alone units that you can get for a much lower price. So before deciding to purchase such microwave, weigh up first your needs and the benefits you ll get from such type of oven. Compact units are usually less than 18 inches wide, 14 inches deep, and 12 inches tall and their capacity is less than one cubic foot. The wattage of such units ranges from 500 to 1000 watts. Medium capacity microwaves come with a width of 20 inches or more and with capacities of 1 1.5 cubic feet. Such type usually has auto-cook features that are not common in compact units.