10 Fast Facts about the Microwave

10 Fast Facts about the Microwave...Percy Spencer, radio frequency, healthy cooking, and more

10 Fast Facts about the Microwave

1. Discovered during WWII—by accident

Microwave energy was initially developed for radar systems during World War II. In 1945, Dr. Percy Spencer was working on radar systems for Raytheon Corporation when he accidentally discovered that microwaves could be used for cooking. While conducting experiments with a new style magnetron, a candy bar in his pocket melted.

Get a firsthand account in this interview with Dr. John Osepchuk [1].

2. The first microwave oven

The first commercial microwave oven was produced in 1947. The oven was about 6 feet tall and weighed about 750 lbs. In 1965, Raytheon acquired Amana® Refrigeration.  Two years later, Amana brought the first affordable home microwave to market: the Radarange™—a name that is still associated with Amana® Commercial ovens and ACP, Inc.

3. Cooking with radio frequency

The heart of the microwave oven is the magnetron, a device that produces radio waves. These waves excite water molecules within food, causing them to vibrate rapidly. This vibration results in heat, cooking the food from within.

4. Seal of safety

The Slotted Choke Door Seal is the reason microwave ovens are safe and available for public and home use today. It virtually eliminates microwave energy escaping from the oven cavity. One of its inventors, Dr. John Osepchuk is still an ACP consultant.

Modern microwaves are regulated with stringent standards. [2] Each ACP oven is tested to meet and exceed these standards.

Electromagnetic Spectrum

5. Microwave cooking retains nutrients

According to a study by Harvard Medical School, “because microwave cooking times are shorter, cooking with a microwave does a better job of preserving vitamin C and other nutrients that break down when heated.” Steaming in the microwave is actually preferable to submerging foods in water, which can result in a loss of nutrients. “The cooking method that best retains nutrients is one that cooks quickly, heats food for the shortest amount of time, and uses as little liquid as possible. Microwaving meets those criteria.”[3]

6. Turntables are overrated

A popular yet imperfect “solution” to eliminate hot spots is to rotate food on a turntable. With turntables, individual hot spots are eliminated along donut-shaped paths, only to be replaced by bands of hot and cold. Depending on the oven, sometimes the center is cold, sometime its hot. But never uniform. And, more than half the oven’s volume is wasted outside the turntable- a huge waste of money and capacity.

7. Tuning—not just for good band practice

To eliminate hot spots, advanced oven designs like ACP’s, agitate and reflect the microwaves instead of the rotating the food. Microwave energy is reflected off a rotating antenna. This “chops up the nodes”, sweeping them around the oven cavity like a spotlight off a disco ball.

Fueled by decades of dedicated research and development, ACP’s expertise in ‘tuning’ pairs geometry of the cavity with antenna design to optimize energy distribution and intensity. The result is even and superior cooking performance.

This side-by-side thermographic comparison demonstrates the superior and even cooking performance of Amana® and Menumaster® Commercial products.

8. Cook settings—one size does not fit all

Different foods respond differently to microwaving. Balancing cooking power and cooking time is key to overcome the differences between food and ingredients and get a good result. For example, food with a high amount of water, salt, sugar or oils/fat cooks faster because of a higher rate of MW absorption.

The ACP Culinary Center team of expert chefs and food scientists are masters of all things microwavable. They provide expert support to customers, including menu development and cooking times.

9. Saving energy and saving time

According to Energy Star, “Microwave ovens use less energy (up to 80% less) than conventional ovens. In addition to saving energy, microwave ovens generally cook food much faster, and don’t generate as much heat in your kitchen, so you could save on air conditioning costs during the summer.”[4]

So how much does it cost to use a commercial microwave oven on a daily basis? Check out the energy cost breakdown by model.

10. An American tradition in innovation and manufacturing

Microwave cooking was first discovered in the U.S.A in 1945. The first consumer microwave was developed and manufactured in Iowa in 1967. Now, over 50 years later, ACP is proud to continue the legacy as the only microwave manufacturer producing ovens in the U.S.A. Earlier this year, ACP launched the Xpress IQ™ ARX & MRX high speed oven. Xpress IQ™ combines impingement, convection, and perfectly tuned microwave energy for faster cooking, toasting, browning.

ACP, Inc. produces commercial microwave ovens under the Amana® Commercial brand within North America, and the Menumaster® Commercial brand globally. ACP ovens have been ranked best in class year-after-year, and are preferred in areas of performance, reliability, service, construction, ease of use and safety.

Headquartered in Cedar Rapids, Iowa, ACP is a member of the Ali Group – a privately held company based in Milan, Italy that specializes in designing, manufacturing and servicing of commercial foodservice equipment. The Ali Group operates globally through 76 brands with sales and service subsidiaries throughout Europe, North America, South America, the Middle East and Asia Pacific.

ACP, Inc. factory workers building microwave ovens in Cedar Rapids, IA

  1. YouTube / ACP Dr. John Osepchuk Interview, YouTube, 20 Dec. 2013, youtu.be/DgdA3stsjgA.
  2. “CFR – Code of Federal Regulations Title 21.” Accessdata.fda.gov, FDA, US Food & Drug Administration, www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=1030&showFR=1.
  3. Publishing, Harvard Health. “Microwave Cooking and Nutrition.” Harvard Health, 1 Aug. 2017, www.health.harvard.edu/staying-healthy/microwave-cooking-and-nutrition.
  4. “Does Using a Microwave over a Regular Oven Save Energy?” ENERGY STAR, energystar.zendesk.com/hc/en-us/articles/211440198-Does-using-a-microwave-over-a-regular-oven-save-energy-.

Turkey and Cranberry Panini

Chef's Corner

Turkey and Cranberry Panini

It’s that time of year again—turkey time! ACP is getting into the holiday spirit with this tasty turkey and cranberry panini. Chef Tony whipped up a cranberry port sauce from scratch in less than 5 minutes, to add a festive touch to this turkey panini. By using the Amana HDC212 to cook the sauce, Tony was able to save 20 minutes without sacrificing quality, in comparison to traditional stovetop preparation.

With the cranberry sauce done, assembling the panini was a snap. After just 35 seconds in the Amana AXP speed oven, the panini was heated and toasted with striking grill marks. The secret to success? The PRS10 panini press accessory for Amana AXP and Menumaster MXP high-speed ovens. The adjustable and removable panini press works in conjunction with the oven’s 4 cooking technologies, to quickly and consistently deliver perfectly pressed sandwiches. Check out this simple recipe and try it out for yourself this holiday season!


Port-Cranberry Sauce
  • 1/2 cup (120mL) Ruby Port
  • 1/8 tsp (0.5mL) orange zest
  • 1/2 cup (120mL) fresh orange juice
  • 8 oz. (240g) fresh cranberries
  • 3/4 cup (144g) sugar
Turkey and Cranberry Panini
  • 1 ciabatta roll
  • port cranberry sauce
  • 3oz. (85g) sliced turkey
  • 2 slices provolone cheese
  • 1 handful of baby arugula leaves

Port-Cranberry Sauce

Total Cook Time: 3:50

Yield:2 cups (473ml)


  • 4″ (10cm) deep, 1/2-sized pan


  1. In a 1/2-sized pan combine the port with the orange zest and orange juice. Bring to boil heating in the HDC212, MDC212, or DEC21E2 for 1:15 at 100% power.
  2. Remove from oven. Add cranberries and sugar. Return to oven and heat for another 1:15 at 100% power.
  3. Remove from oven and stir. Return to oven and heat for another 45 seconds at 100% power.
  4. Remove from oven and stir. Return to oven and heat for a final 35 seconds at 100% power.
  5. Transfer to a bowl. Serve warm, refrigerated, or on Turkey and Cranberry Panini.
    Note: Allow to rest to reach thicker consistency.

Turkey and Cranberry Panini

Total Cook Time: 0:35

Serving Size:1 sandwich


  • PRS10 Panini Press


  1. With panini press (PRS10) accessory installed and its top grill plate set on the middle level, preheat AXP or MXP oven to 520°F (270°C).
  2. Slice ciabatta bread horizontally and lay both sides cut side up.
  3. Assemble the sandwich filling in the following order:
    1. Spread the bottom side of bread with your freshly made port cranberry sauce
    2. Top with turkey slices
    3. Layer slices of provolone cheese on top of turkey
    4. Top with fresh arugula
    5. Cap sandwich with top part of bread

  4. With the PRS10 set on the middle level place sandwich in the AXP/MXP oven.
  5. Toast in oven with the following settings:
    Oven Temperature: 520°F (270°C)
    Stage Time MW% Fan% IR%
    1 0:35 100% 0% 100%

  6. When done, remove from oven cut in half and enjoy.