You'll see larger capacity, sensors that detect doneness, and stylish designs.
Microwave ovens, which built their reputation on speed, are also showing some smarts. Many automatically shut off when a sensor determines that the food is cooked or sufficiently heated. The sensor is also used to automate an array of cooking chores, with buttons labeled for frozen entrées, baked potatoes, popcorn, beverages, and other common items. Design touches include softer edges for less boxy styling, hidden controls for a sleeker look, stainless steel, and, for a few, a translucent finish.
GE leads the countertop microwave-oven market with approximately 30 percent of units sold, followed by Sharp. Other brands include Emerson, Kenmore, Panasonic, and many others. GE also sells the most over-the-range models.
Microwaves come in a variety of sizes, from compact to large. Most sit on the countertop, but a growing number sold--about 15 percent--mount over the range. Several brands offer speed-cooking via halogen bulbs or convection. Speed-cook models promise grilling and browning, though results can vary significantly depending on the food. Manufacturers are working to boost capacity without taking up more space by moving controls to the door and using recessed turntables and smaller electronic components.
Microwave ovens vary in the power of the magnetron, which generates the microwaves. Midsized and large ovens are rated at 850 to 1,650 watts, compact ovens at 600 to 800 watts. A higher wattage may heat food more quickly, but differences of 100 watts are probably inconsequential. Some microwave ovens have a convection feature--a fan and, often, a heating element--which lets you roast and bake, something you don't generally do in a regular microwave.
Price range: $40 to $250 (countertop models); $100 to $700 (over-the-range); $250 to $1,000 (convection or halogen-bulb countertop or over-the-range).
On most, a turntable rotates the food so it will heat more uniformly, but the center of the dish still tends to be cooler than the rest. With some models, you can turn off the rotation when, for instance, you're using a dish that's too large to rotate. The results won't be as good, however. Some models have replaced the turntable with a rectangular tray that slides from side to side to accept larger dishes. Most turntables are removable for cleaning.
You'll find similarities in controls from model to model. A numeric keypad is used to set cooking times and power levels. Most ovens have shortcut keys for particular foods and for reheating or defrosting. Some microwaves start immediately when you hit the shortcut key, others make you enter the food quantity or weight. Some models have an automatic popcorn feature that takes just one press of a button. Pressing a 1-minute or 30-second key runs the oven at full power or extends the current cooking time. Microwave ovens typically have a number of power levels. We've found six to be more than adequate. A child lock renders controls inoperable.
A sensor helps prevent over- or undercooking by determining when the food is done based on infrared light or the steam emitted by food. The small premium you pay for a sensor is worth it. A convection mode maximizes browning and crisping with heated air circulated by a fan. A few ovens have a crisper pan for making bacon or crisping pizza.
Over-the-range ovens vent themselves and the range with a fan that has several speed settings. Typically the fan will turn on automatically if it senses excessive heat from the range below. Over-the-range microwaves can be vented to the outside or can just recirculate air in the kitchen. If the oven is venting inside, you'll need a charcoal filter (sometimes included). An over-the-range microwave generally doesn't handle ventilation as well as a hood-and-blower ventilation system because it doesn't extend over the front burners.
HOW TO CHOOSE
Decide which type meets your needs. Countertop models cost the least and are best for kitchens with lots of counter space. Compact models can cost as little as $30. Midsized and large models have more capacity and features, though most eat up 2.8 to 3.2 square feet of counter space. You can hang some countertop models below a cabinet, though doing so often leaves little space below the microwave oven.
You're likely to consider an over-the-range oven only if you're replacing one or remodeling your kitchen. While they save counter space, installation is an added expense and may require an electrician. What's more, they can't vent steam and smoke from a range's front burners as well as the range hoods they replace.
Choose convenience, not clutter. There's little reason to buy a microwave without a sensor, which shuts off oven power when it senses the food is hot; sensor models begin at about $85. Our tests have found that sensor models generally perform better than those without them. But you may want to avoid ovens with an array of shortcut and defrost settings for foods you don't eat.
Consider convection. Paying extra for a convection mode is worth it if you use your microwave as a second oven, but it might not be necessary otherwise. Combination convection and microwave cooking saves time, although these units seldom brown and crisp food as well as conventional ovens and toaster ovens, which you probably own already.
Be skeptical about capacity. Manufacturers, we found, sometimes exaggerate the capacity of their ovens by counting wasted space in the corners. The ovens' actual cooking space can be as much as 50 to 60 percent less than claimed. Check whether a large platter fits inside an oven you're considering.
Consumer Reports has no relationship with any sponsor or advertiser of BabyCenter. Copyright © 2002-2006 Consumers Union of U.S., Inc.