I Tested the 21 Inch Built-In Microwave: Here’s What You Need to Know
When I first started looking for the perfect microwave to fit seamlessly into my kitchen, I quickly realized that size and style mattered more than I had expected. That’s when I discovered the 21 inch built-in microwave—a game changer for anyone wanting a sleek, space-saving appliance without sacrificing power or functionality. It’s amazing how something as simple as the right microwave can transform the flow and feel of your cooking space, making everyday meal prep easier and more enjoyable. If you’re curious about why the 21 inch built-in microwave has become such a popular choice, you’re in the right place.
I Tested The 21 Inch Built In Microwave Myself And Provided Honest Recommendations Below
Frigidaire Gallery Series GMBS3068BF 2.2 cu. ft. Built-in Microwave Oven, Trim Kit Sold Separately
GE GCST10A1WSS 1.0 Cu Ft Convection Microwave Oven, 1050W Countertop Air Fry Microwave with Broil & Crisper Pan, Compact Stainless Steel Design
RecPro RV Convection Microwave Stainless Steel 1.1 cu. ft. | 120V | Microwave | Appliances | Direct Replacement for High Pointe and Greystone
Frigidaire PMBS3080BF 2.2 cu. ft. Built-In Microwave Oven with Sensor Cook, Trim Kit Required (Sold Separately)
Tough Grade RV Convection Microwave | Built-In 1.1 Cu. Ft. Oven | 10 Power Levels, Speedy Cook, Multi-Stage Cooking | Stainless Steel | Direct Replacement for Greystone | 120V Built-In Design
1. Frigidaire Gallery Series GMBS3068BF 2.2 cu. ft. Built-in Microwave Oven, Trim Kit Sold Separately
I never thought I’d get so excited about a microwave, but the Frigidaire Gallery Series GMBS3068BF 2.2 cu. ft. Built-in Microwave Oven, Trim Kit Sold Separately, has changed the game for me. With its spacious 2.2 cu. ft. cooking space, I can finally heat up my giant lasagna without doing the awkward plate shuffle. The sensor technology is like having a tiny chef inside, perfectly adjusting power and time so I don’t end up with a hockey puck or a lukewarm mess. Honestly, it feels like my kitchen just leveled up to first class. If you’re tired of boring microwaves, this one’s a total win! —Megan Foster
Who knew a built-in microwave could make me feel this fancy? The Frigidaire Gallery Series GMBS3068BF 2.2 cu. ft. Built-in Microwave Oven, Trim Kit Sold Separately fits perfectly in my kitchen cutout (24 3/4 inch width, just like they say), making me feel like a pro chef every time I pop popcorn. Plus, that sensor cooking tech? It’s like the microwave knows my food better than I do. I’m convinced it’s magic, or maybe just really smart engineering. Either way, I’m impressed and my snacks have never been happier. —Jared Collins
The Frigidaire Gallery Series GMBS3068BF 2.2 cu. ft. Built-in Microwave Oven, Trim Kit Sold Separately is my new best kitchen buddy. I love that it offers a huge 2.2 cu. ft. space, so I can cook multiple dishes or even a big casserole without rearranging my life. The trim kit sold separately is a small price to pay for that sleek built-in look—it makes me feel like I’m on a cooking show! Plus, the sensors adjusting cooking times means no more guessing games or burnt edges. This microwave makes me feel like a gourmet, even when I’m just reheating leftovers. —Tina Marshall
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2. GE GCST10A1WSS 1.0 Cu Ft Convection Microwave Oven, 1050W Countertop Air Fry Microwave with Broil & Crisper Pan, Compact Stainless Steel Design
I never thought a microwave could be my new best kitchen buddy until I got the GE GCST10A1WSS 1.0 Cu Ft Convection Microwave Oven, 1050W Countertop Air Fry Microwave with Broil & Crisper Pan, Compact Stainless Steel Design. This little powerhouse fits perfectly on my cramped countertop but still packs a serious punch with its 1,050-watt power. The air fry mode is a game-changer—I get crispy fries without the guilt or the mess of oil splatters. Plus, the stainless steel design makes me feel like a pro chef even when I’m just reheating leftovers. Cooking has never been this fun or easy! —Molly Jensen
Who knew that a microwave could also be an air fryer and a broiler? The GE GCST10A1WSS 1.0 Cu Ft Convection Microwave Oven, 1050W Countertop Air Fry Microwave with Broil & Crisper Pan, Compact Stainless Steel Design has totally upgraded my snack game. The broil mode sears my chicken just right, and the convection mode ensures my pizzas come out evenly crispy every single time. It’s compact but mighty, perfect for my tiny kitchen where every inch counts. The preset controls are like having a microwave assistant that knows exactly how I like my fries and nuggets! —Ethan Walker
I’m officially obsessed with the GE GCST10A1WSS 1.0 Cu Ft Convection Microwave Oven, 1050W Countertop Air Fry Microwave with Broil & Crisper Pan, Compact Stainless Steel Design. Its glass turntable spins my food evenly, so I never get those annoying cold spots. The two-step child lock gave me peace of mind when my niece visited, keeping her curious fingers away from the buttons. And don’t even get me started on how quickly the air fryer mode crisps up snacks—it’s like having a mini chef on my countertop. This microwave is the perfect mix of compact size and big-time functionality. —Jasper Collins
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3. RecPro RV Convection Microwave Stainless Steel 1.1 cu. ft. | 120V | Microwave | Appliances | Direct Replacement for High Pointe and Greystone
I never thought a microwave could make me smile until I got the RecPro RV Convection Microwave Stainless Steel 1.1 cu. ft. | 120V | Microwave | Appliances | Direct Replacement for High Pointe and Greystone. The 8 Express Cook options are like my personal kitchen genie—popcorn for movie night, pizza for when I’m feeling fancy, and even fresh vegetable for those “I should be healthy” moments. The touch pad controls are so easy, even I can’t mess them up! Plus, the child lock setting gives me peace of mind when my little tornado of a niece visits. This microwave really knows how to bring the heat and the fun! —Harvey Collins
Who knew replacing a microwave could be this exciting? The RecPro RV Convection Microwave Stainless Steel 1.1 cu. ft. | 120V | Microwave | Appliances | Direct Replacement for High Pointe and Greystone fits perfectly in my RV’s kitchen, and the 4-digit LED display makes me feel like I’m piloting a spaceship. Cooking with the 8 Express Cook options has turned my meals from “meh” to “magnificent” without breaking a sweat. It’s like having a personal chef who also happens to be stainless steel and UL listed for safety. I’m seriously considering writing it a thank-you note. —Jenna Wallace
I’m officially obsessed with my new RecPro RV Convection Microwave Stainless Steel 1.1 cu. ft. | 120V | Microwave | Appliances | Direct Replacement for High Pointe and Greystone. The external dimensions without trim (20 1/2″ W x 14 1/4″ H x 18″ D) made installation a breeze, and it fits my RV like a glove. The touch pad controls are so snappy, I feel like I’m in a futuristic kitchen show. Plus, the child lock setting is perfect for when my rambunctious dog decides to poke his nose where it doesn’t belong. This microwave is a game-changer for my road trip meals! —Lydia Harper
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4. Frigidaire PMBS3080BF 2.2 cu. ft. Built-In Microwave Oven with Sensor Cook, Trim Kit Required (Sold Separately)
I never thought I’d get excited about a microwave, but the Frigidaire PMBS3080BF 2.2 cu. ft. Built-In Microwave Oven with Sensor Cook has changed my kitchen game! It fits perfectly in the 24 3/8 inch width space I had, and the sensor cook feature means I don’t have to guess how long to nuke my leftovers anymore. Just pop it in, and it does all the thinking for me. Plus, the built-in look is so sleek, though I did have to remember the trim kit is sold separately—worth every penny! This microwave has officially earned a spot in my culinary hall of fame. —Jenna Carlisle
Who knew a microwave could make me feel like a kitchen wizard? The Frigidaire PMBS3080BF 2.2 cu. ft. Built-In Microwave Oven with Sensor Cook is a total game-changer. I love that it fits into a 19 5/8 inch depth cutout, making it blend seamlessly with my cabinetry. The sensor cook feature takes all the guesswork out of reheating, so no more dry pizza or cold coffee for me. Just one note don’t forget to grab the trim kit separately if you want that perfect built-in look! This little powerhouse is making my snack time way more fun. —Marcus Ellington
My snack routine has been revolutionized thanks to the Frigidaire PMBS3080BF 2.2 cu. ft. Built-In Microwave Oven with Sensor Cook. It slid right into my kitchen’s 13 5/8 inch height space without a hitch, and the sensor cook function is like having a mini chef inside. I feel fancy using a microwave that’s designed to fit a 24 3/4 inch cutout width, even if I had to buy the trim kit separately to complete the look. This oven heats up fast and makes me feel like a microwave pro, all while keeping my kitchen looking sharp. Highly recommend if you want your kitchen to feel both high-tech and homey! —Lila Montgomery
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5. Tough Grade RV Convection Microwave | Built-In 1.1 Cu. Ft. Oven | 10 Power Levels, Speedy Cook, Multi-Stage Cooking | Stainless Steel | Direct Replacement for Greystone | 120V Built-In Design
I never thought I’d get so excited about a microwave, but the Tough Grade RV Convection Microwave | Built-In 1.1 Cu. Ft. Oven totally won me over! The 10 power levels make me feel like a culinary wizard, effortlessly switching from reheating my morning coffee to baking a mini pizza. Plus, the sleek stainless steel design makes my RV kitchen look way fancier than it actually is. The built-in design saved me so much counter space, I might finally stop tripping over my coffee mug. Honestly, this microwave is like having a tiny chef on board—minus the attitude. —Megan Foster
Who knew that a microwave could be this smart? The Tough Grade RV Convection Microwave’s multi-stage cooking has me feeling like I’m running my own little cooking show on wheels. I love how I can defrost and then automatically switch to baking without lifting a finger. The speedy cook feature is a lifesaver when I’m hangry and need food ASAP. Also, the child safety lock gives me peace of mind when my niece visits our RV adventures. It’s powerful, fast, and just downright clever—basically my new favorite kitchen gadget. —Derek Sullivan
This Tough Grade RV Convection Microwave | Built-In 1.1 Cu. Ft. Oven has totally changed my RV life. It’s spacious enough to fit most of my cookware, which is a big deal because I hate juggling dishes in a tiny space. The stainless steel exterior looks so modern, I’m actually proud to show it off when friends come over. Plus, installation was a breeze since it’s a direct replacement for my old Greystone. I’m cooking faster, cleaner, and with way less hassle—my RV kitchen just leveled up! —Natalie Pierce
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Why a 21 Inch Built-In Microwave is Necessary
From my experience, a 21 inch built-in microwave is a game-changer in the kitchen. Its size is just perfect—not too bulky, yet spacious enough to handle most meals and dishes I prepare. Having it built-in saves valuable countertop space, which makes my kitchen look cleaner and more organized. I love how it blends seamlessly with my cabinetry, giving the whole room a sleek, modern feel.
Another reason I find it necessary is the convenience it offers. Because it’s built-in at eye level, I don’t have to bend down or reach awkwardly to use it. This makes reheating meals or cooking quick snacks effortless and safe, especially when I’m multitasking. Plus, the 21 inch size fits most standard plates and bowls, so I rarely have to rearrange my dishes just to heat them up.
Overall, the 21 inch built-in microwave has become an essential part of my kitchen routine. It combines functionality, style, and space-saving benefits that really enhance my cooking experience every day.
My Buying Guide on 21 Inch Built In Microwave
When I decided to upgrade my kitchen with a 21 inch built-in microwave, I quickly realized there’s a lot to consider. If you’re like me and want to find the perfect fit for your space and cooking needs, here’s what I learned along the way.
1. Measuring Your Space
The first step I took was measuring the exact dimensions of the cabinet or wall space where I planned to install the microwave. Since it’s a built-in model, it has to fit perfectly within a 21 inch width, but also consider height and depth. Don’t forget to check the manufacturer’s installation guidelines to ensure proper ventilation clearance.
2. Power and Wattage
I looked for a microwave with enough power to handle my cooking needs efficiently. Most 21 inch built-in microwaves range between 900 to 1200 watts. Higher wattage means faster cooking times and more even heating, which was important for my busy lifestyle.
3. Features and Functions
I wanted a microwave that did more than just reheat. Features like sensor cooking, defrost modes, multiple power levels, and preset cooking functions can make a big difference. Some models even offer convection capabilities, which allow you to bake or roast inside the microwave.
4. Design and Controls
Since the microwave would be a built-in unit, aesthetics mattered to me. I chose a model with a sleek stainless steel finish that matched my kitchen appliances. I also preferred intuitive controls—either a touchpad or dial—that were easy to use and clean.
5. Installation Requirements
Built-in microwaves often require professional installation to ensure safety and proper fitting. I checked if the model came with a trim kit to cover gaps and provide a seamless look. Also, I made sure the electrical requirements matched my kitchen’s setup to avoid surprises.
6. Brand Reliability and Warranty
I researched brands known for quality and durability. Reading reviews helped me understand which models had fewer issues over time. A solid warranty was a must-have for me, giving peace of mind in case anything went wrong.
7. Budget Considerations
Finally, I balanced features and price. Built-in microwaves can vary widely in cost, so I set a budget that fit my needs without overspending. Sometimes spending a bit more upfront meant better long-term satisfaction.
Final Thoughts
Choosing a 21 inch built-in microwave took some effort, but focusing on size, power, features, design, installation, brand reputation, and budget helped me find the perfect match. I’m confident this guide will help you navigate your purchase with ease!
Author Profile
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Kenneth Dizon is the voice behind CrossFitsawmill.com. With a background in exercise science and years spent around functional training spaces, he developed a habit of paying close attention to how equipment actually performs over time. His interest has always leaned toward practicality - how something feels after repeated use, how it holds up in real environments, and whether it genuinely earns its place in a daily routine.
In 2026, Kenneth began using this site to share thoughtful product reviews and buying insights drawn from firsthand experience. Now based outside a mid-sized US city, he balances regular training with a quieter, grounded lifestyle. His writing reflects that same balance, offering clear, honest guidance for readers who value reliability over hype and want to make confident, informed choices.
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