How to Choose a Microwave or Oven Microwave in Japan (2026): Reheating vs. Cooking, Capacity, and Interior Type
Prices, point rates and sale details in this article were checked by the mottoku editorial team against each service's official site and API (as of the last update). Always check the official sites for current prices, stock and campaign terms.
Think of "reheating" and "baking/steaming" as separate appliances, and choosing gets much easier
Microwave aisles are confusing because boxes that look alike range from around 10,000 yen to over 150,000 yen. What helps is one simple question: will I use this box to reheat, bake, or steam? Someone who only reheats frozen rice and ready-made side dishes needs completely different hardware from someone who bakes cookies and browns gratin on weekends. Put the other way, if you can sum up your use in one line, you can skip half the spec sheet in the store.
There are four broad types. A basic microwave (単機能電子レンジ) only reheats and defrosts with microwaves. An oven microwave (オーブンレンジ) adds a heater so you can bake sweets and toast. A steam oven microwave boils water to steam food. At the top, the superheated steam type (Sharp's Healsio is the best-known) uses steam above 100℃ to remove excess oil from food and help with low-salt cooking. Each step up adds features, but also adds to the price and the electricity bill.
The one-line answer: almost all reheating and defrosting → basic microwave (flat interior). Sweets or toast a few times a month → oven microwave. Steamed dishes, meal prep or healthy cooking on a regular basis → steam/superheated steam type. This article is general information; the best choice depends on household size, how you cook and your budget. These appliances get very hot, so please be sure to read the safety section later on.
What the 4 types can do, and where prices jump
They're all called "microwaves," but what they can do and what they cost vary enormously. Start by looking at the full range and working out where you should stop.
| Type | What it does | Typical price | Best for |
|---|---|---|---|
| Basic microwave | Reheat, defrost | From about 10,000 yen | Mainly reheating, living alone, second unit |
| Oven microwave | Reheat + oven/grill | 20,000–50,000s yen | Also sweets, toast, gratin |
| Steam oven microwave | + steam cooking | 40,000–80,000s yen | Steamed dishes, healthy cooking |
| Superheated steam (Healsio, etc.) | + removes oil, low-salt | 70,000 to over 150,000 yen | Serious cooks, oil-free, health-conscious |
Prices jump at two points. The first is superheated steam: once you cross that line, you're in high-end territory. The second is a two-level oven (bakes on upper and lower racks at once), LCD touchscreens and smartphone integration. These are handy, but often wasted on people who mainly reheat. Prices change with the season and model number, so check the current listings on online stores or in shops for actual figures.
Capacity (L) depends on "plate size" more than "household size"
Capacity is usually discussed by household size (up to 20L for one person, 23–26L for two or three, 30L or more for four or more or heavy oven use), but where size really causes trouble is whether your usual plates and lunch boxes fit inside. If you often heat large plates, a flat-interior model around 26L will save regrets even for a small household. On the flip side, if your space is tight, going big on capacity can leave you with a unit that won't fit at all.
Flat interior vs. turntable: the difference shows in cleaning and big plates
Interior design is the part that slowly affects everyday use the most. Skimp here and you'll live with the frustration for years.
A flat interior has no rotating plate and a level floor, so wide lunch boxes and large plates go straight in. It spreads microwaves with a rotating antenna, so heating stays fairly even without spinning the food. Best of all, spills come off with a single wipe. Nearly all mid-range and higher models today are flat.
A turntable is the traditional design that evens out heating by rotating the plate, and it's still common on cheap models. Its everyday drawbacks: large containers hit the edge of the plate and won't fit, and grime builds up under the plate and on the rotating ring, making cleaning a chore. It's an option if price is your top priority, but if in doubt, go flat.
When checking the interior in a store, even if it says "flat," see whether the floor is a removable double layer and whether it can be fully washed. Black interiors just make dirt harder to see; leaving grease behind can cause smoke or fire. Choose based on whether the flat surface is easy to wipe clean, not on looks.
Auto-reheat accuracy comes down to sensors, and that's the real value of higher-end models
Pricier models aren't expensive just because of fancier ovens. A big part of the difference is the sensors that decide how well your daily reheating turns out. When reheated rice ends up scorching in one spot and cold in another, it's usually because the sensor's reading is rough.
- Weight sensor: the basic type, estimating heating time from the weight inside. Common on cheap models; the container's weight can throw off accuracy.
- Temperature (infrared) sensor: reads the food's surface temperature directly, so even small portions heat up nicely. The workhorse of mid-range models.
- Steam (humidity) sensor: detects steam coming off the food and stops heating. Great at avoiding uneven heating of bento and frozen rice. Used together with temperature sensors on high-end models.
Ironically, people who just want to press the reheat button and be done are the ones happiest with a mid-range model with good sensors. On the other hand, if you always heat the same dishes for the same time, setting the wattage and seconds manually works fine even on a cheap model. Whether you rely on auto-reheat determines whether it's worth spending money here.
Knowing what each major brand stands for speeds up choosing a high-end model
High-end oven microwaves differ clearly in philosophy by maker. Even at the same price, their strengths differ, so matching them to the dishes you want to cook is the safe bet. Here's the general direction of the main series.
| Series (maker) | Strengths and features | Good for |
|---|---|---|
| Healsio (Sharp) | Bakes, steams and removes oil with superheated steam. A unique approach that heats using only water | Serious, health-focused cooks: oil-free, low-salt |
| Bistro (Panasonic) | Fast cooking and even browning. Strong at double-sided grilling and cooking straight from frozen | Time-savers, busy two-income households |
| Healthy Chef (Hitachi) | Weight-sensor auto menus and easy "leave it to the machine" use | People who want auto modes without complex settings |
| Ishigama Dome (Toshiba) | High-temperature oven and dome-shaped interior for good heat circulation. Strong for bread and sweets | People who want to bake proper bread and pastries |
| The Range (BALMUDA) | Design-focused, down to the sounds and feel of operation. Simple functions, stylishly done | People who prioritize looks and interior style |
Roughly: Healsio for steaming and healthy cooking, Bistro for speed, Ishigama Dome for bread and sweets. Hitachi's Healthy Chef suits people who'd rather not fiddle with settings, and BALMUDA appeals to those who care most about how the kitchen looks. Every maker changes model numbers each generation, with features gradually cut from top to mid to lower grades, so look beyond the series name to the model year and grade.
Within the same series, sometimes only the top model has full superheated steam, while lower grades are "steam-style" (you pour water into the tray). Choosing by series brand alone can leave you without the key feature, so always check the spec sheet for superheated steam (過熱水蒸気), two-level oven (2段オーブン) and maximum oven temperature (最高庫内温度).
By lifestyle: where to stop
If it's almost all reheating and defrosting, a basic model is more than enough
If you mostly reheat rice and side dishes and defrost frozen food, a basic microwave with a flat interior and an auto-reheat sensor is the best value. Inverter models control output finely and reduce uneven defrosting. Pay tens of thousands extra for an oven you never use, and you're just paying for counter space.
Sweets, toast or gratin a few times a month: an oven microwave
If you want to handle cookies, sponge cake, toast and browning gratin, go for an oven microwave. It can double as a toaster and saves space. But some models take a few minutes to preheat, so if you toast several slices every morning, consider also keeping a dedicated toaster. For serious batch baking, a two-level oven that bakes upper and lower racks at once makes a real difference.
Steamed dishes, meal prep and healthy cooking every day: superheated steam
If you regularly make steamed vegetables, chawanmushi, oil-free "karaage-style" chicken or low-salt dishes, this is where superheated steam models like Healsio come in. They widen your options, like removing excess fat from chicken or steaming in batches for meal prep. But they're pricey and bulky, so be honest about whether it's "I'll do it every week," not "maybe someday." Health benefits vary by model and ingredient and can't be guaranteed, so check each maker's official site for feature details.
One oven microwave, or a basic microwave plus a toaster?
By now, many of you are probably stuck on one question: is one oven microwave enough, or is it better to have a basic microwave alongside a good toaster? This choice is tied directly to counter space and outlet availability, so settling it before narrowing down models speeds up everything else.
The first advantage of two appliances is faster toast. A toaster has a small interior with heaters right next to the bread, so it toasts with almost no preheating. Toasting with an oven microwave's grill takes longer because the large interior needs time to heat up, and quite a few models require you to flip the bread halfway. Plus, at busy moments like breakfast, two units let you reheat rice and toast bread at the same time. And if one breaks, you can still get meals on the table.
The drawbacks are clear: space and power. You need room for two units plus ventilation space for each. Both draw a lot of power, so running both at full output on the same circuit can trip the breaker. Check your kitchen breaker panel and how many things are plugged into extension strips before buying. Also, a toaster tray is small, so lining up several gratin dishes, roasting a whole chicken or fitting a chiffon cake pan is basically impossible.
Going with one oven microwave means just one spot on the counter, and you can make large tray dishes and two-level bakes. However, you can't use the microwave and oven at the same time. While the oven is baking for 30 minutes, you can't reheat anything. That's fine if you mostly batch-cook or bake on weekends, but in households where family members eat at different times on weeknights, this bottleneck quietly adds up.
| If you use it like this | Best setup |
| 90% reheating and defrosting frozen rice, almost no baking | One basic microwave with a flat interior. Easiest to clean and set up |
| Toast in the morning, reheating at night, no baking sweets | Basic microwave + toaster. Very satisfying for results and speed |
| You bake bread and sweets, and want to use two trays | Oven microwave with convection (hot air) that can bake on two levels |
| Reheating fried food, removing oil, prepping for meal prep | Mid- to high-end oven microwave with superheated steam |
| Limited width, or only one outlet | Consolidate into one oven microwave |
Here's also where high-end and mid-range models really differ. In catalogs the obvious differences are the number of trays and auto menus, but what actually affects usability is the sensor type and how steam is supplied. Steam systems come in stages: a simple method that pours water into the tray, a pump feeding from a water tank, and a dedicated boiler that produces high-temperature steam. The higher you go, the better the steaming and superheated steam performance. But a water tank also means refilling and drying it, so be honest about how many times a month you'll steam. If it's just a few times a year, the simple method is plenty.
Some people consider renting or an appliance subscription. If you're on a solo work assignment or only living somewhere a few years, not having to arrange disposal when moving out is a real plus. However, subscriptions mostly offer basic microwaves, and oven microwaves are limited. Also, monthly fees add up, and at some point they exceed what buying would have cost. Realistically, write down the contract length and how long you plan to stay, and decide based on whether you'll move out before that break-even point.
If you're thinking of taking one from a friend or buying used, always check the power frequency label. Some older basic microwaves are 50Hz-only or 60Hz-only, so if you move between eastern and western Japan they may not work or heating times may be way off. Recent models are almost all frequency-free (ヘルツフリー), but the older the model, the more careful you need to be. Also, avoid units with damaged door seals or a poorly closing door, as they're a safety risk for microwave leakage.
"What a waste" moments people only notice after buying, so you can avoid them
Microwave regrets are rarely about poor performance. They're mostly about overpaying for unused features and overlooking installation and safety. Here are common stumbles, based on real cases.
- Bought a top-end superheated steam model, but only ever press "reheat": the most common regret. If you won't steam even once a month, putting the difference toward a mid-range model with good sensors, or a dishwasher, is often more satisfying.
- Chose the size by household and your usual large plate didn't fit: check the actual dimensions of the plates and lunch boxes you use rather than the capacity figure. The reverse also happens: someone gets greedy, buys a 30L model, and it won't fit on the shelf.
- Squeezed it tightly onto a shelf without ventilation space, and it got less efficient: most models need gaps at the back, sides and top for heat to escape. Boxing it in can cause breakdowns or weak heating. Plan the space as "unit size + ventilation space."
- The breaker tripped when using a high-output model (1000W, etc.): they draw a lot of power, and using them at the same time as other power-hungry appliances on the same circuit can trip it. Checking which circuit the outlet is on gives peace of mind.
- Chose a turntable model, and containers hit the edge of the plate and won't fit, and cleaning is a hassle: putting price first turned into daily frustration. For large plates and easy cleaning, flat would have been the safer pick.
Safety rules for a heat-producing appliance: never compromise on these
Microwaves are everyday items, but used wrongly they're heating appliances that can catch fire or cause things to explode. Follow these rules regardless of model or price.
- Know what never to put insideDon't heat metal or gold-leaf dishes, aluminum foil, eggs in their shells or boiled eggs, sealed containers, or containers not marked microwave-safe. They can spark, catch fire or explode.
- Install with ventilation spaceLeave the gaps specified in the manual at the back, sides and top. Boxing it in can cause breakdowns and lower efficiency. Also check that the surface underneath is heat-resistant.
- Watch out for heat after using the ovenThe interior, door and top get hot. To avoid burns, don't touch them with bare hands until they cool. Also avoid placing it where children can reach.
- Clean the interior oftenLeaving grease and spills can cause smoke or fire. Heating a heat-resistant container of water and letting the steam loosen grime makes it easier to wipe off.
- Stop immediately if something's wrongIf you notice strange noises, odd smells or smoke, stop using it and contact the maker. Overheating (running empty or heating too long) can also trigger a fire.
Checks to do the week it arrives, and what to look for in the warranty
Oven microwaves weighing over 20kg aren't unusual, and once installed, moving or returning one is a big job. That's exactly why running through everything in the first few days after unboxing is the cheapest way to deal with problems later. Here's a checklist focused on the issues most likely with this appliance.
- Outer box and unit exteriorFor shipping dents, taking photos of the box before opening it speeds things up. On the unit, check for a wobbly door, chipped interior paint and a warped top. If the door sits raised on one side when closed, contact the seller right then.
- Check the accessoriesSquare tray, grill rack, rack, water tank, turntable plate and rotating ring, manual and recipe book. Trays are model-specific and a hassle to buy separately later, so count how many you have.
- Ground wire and installation spaceIt's used in a damp area, so always connect the ground. Also measure that you have the top, back and side clearance listed in the manual.
- Test microwave heatingPut about 200ml of water in a heat-resistant container and heat at around 600W for about a minute and a half. If it stays lukewarm, or you hear crackling sparks or smell burning, stop using it and contact the seller.
- Run the oven and grill emptyA smell from rust-proofing oil on the first run is normal. Run it empty with ventilation as the manual says, and check that it reaches the set temperature, the interior light turns on, and the fan doesn't make odd noises.
- Test the steam water supplyFill the tank and run one steam cycle, then check for water seeping out under or behind the unit. Leaks in the water line often show up only after a few uses.
An often-overlooked warranty point is that the main unit and key parts may have separate warranty periods. Some makers give longer coverage than the main unit for parts that are costly to repair, such as the magnetron that generates the microwaves. The conditions are on the back of the warranty card or at the end of the manual, so read them right after buying, and at the same time make sure the purchase date and store name are filled in and keep your receipt. With online purchases there's no stamped card, so your order history or delivery slip serves as proof of purchase date.
If you add an extended warranty, read what's excluded first to avoid disappointment. Generally, food burnt onto the interior, accidents that led to smoke or fire, damage from using unapproved containers, and user-caused issues like drops or water damage aren't covered. On the other hand, age-related issues common after a few years, like weaker heating or the oven not reaching the set temperature, are typical cases where an extended warranty really helps.
It's also worth checking how repairs work before buying. Carrying something this heavy to a store isn't realistic, so most repairs are done on-site, but on remote islands or in mountain areas the service area and wait time may differ. Also look at the maker's published retention period for repair parts (補修用性能部品の保有期間). It's set as a number of years after production ends; after that, parts run out and repairs may no longer be possible. If you plan to use it a long time, buying a model soon after release lets you benefit from that period longer.
Many online stores only accept appliance returns if they're unopened and unused, and once installed and powered on, returns generally aren't accepted unless it's an initial defect. When it arrives, first make sure it actually fits before you plug it in. Also, registering as a user with the maker at purchase means you'll get notices about free inspections and recalls. It's worth doing as a way to make sure safety information reaches you.
Keep it heating the same way five years from now: cleaning the interior and parts that wear out
Microwaves are the classic "never cleaned until they break" appliance, but in reality, how you care for them shows directly in lifespan and results. If splattered oil or sugar keeps getting heated, those spots get locally very hot, stick, and eventually burn, becoming a source of smoke or fire. This continues from the safety section, but here's a more concrete look at daily care.
Different grime needs different cleaning
- Splattered oil: while still warm, it comes off with a damp cloth. If it's cooled and hardened, heat a heat-resistant container of water for a few minutes to fill the interior with steam, then wipe; it's much easier. Water with baking soda dissolved in it works well on grease.
- Burnt or charred grime: scrubbing with steel wool or abrasives scrapes off the interior coating, and those spots then trap even more dirt. Loosen it with steam first, then remove it little by little with a plastic scraper or soft sponge.
- Odors: the standard methods are heating water with lemon or orange peel, or evaporating citric acid water. If your model has a deodorizing function, use that.
- Limescale in the water tank and steam line: white crystal buildup is scale. If your model has a citric acid cleaning cycle, run it when prompted rather than putting it off.
An often-missed spot is the interior ceiling. The grill heater is built in there, so follow the manual's instructions not to touch it directly, but grease buildup there causes smoke when heating. Flat-interior models have ceramic or glass floors that are easy to wipe, but spilled liquid dries and bakes on easily, so wiping it the same day makes a difference. Another spot: the door seal and the surface it presses against. Closing the door with food bits caught there weakens the seal and can cause microwave leakage. Even just opening the door once a week and running a finger along the edge is fine.
Parts that wear out, and how to think about them
Accessories and moving parts wear out before the unit itself. The fluorine or ceramic coating on the square (grill) tray peels off if scraped with a metal spatula or run empty too often. A peeled tray still works for baking, but food sticks more and cleaning takes more effort. With a turntable, the rotating plate is breakable, and the rollers on the ring wear down. Water tank seals can harden and let water seep. All of these can usually be ordered as maker parts, so when choosing a model, checking whether accessories can be bought separately gives you more options later.
Beyond cleaning, how you use electricity is also part of the ongoing cost. Microwave heating itself finishes quickly, but the oven takes time to preheat and draws a lot of power the whole time. That's why baking several things back to back is more efficient than preheating every time for one tray. Superheated steam cooking also takes longer because it has to heat the interior and the boiler. When people feel "I bought it to save time, but cooking takes longer," it's usually because they didn't factor in preheating.
The installation environment also affects lifespan. Cutting down ventilation space raises internal temperatures and speeds up parts wear. Dust building up on the back and side vents has the same effect, so vacuum them with a brush attachment when the seasons change. If you put it on a rack, check the weight limit and don't put heavy things on top. Some models can't be installed at all in built-in shelves without clearance above.
Signs it's time to consider replacing: food clearly takes longer to heat at the same setting and amount, it makes a humming noise it didn't before, a burnt smell won't go away, or it won't run unless you push the door hard. Problems with the door lock in particular involve safety mechanisms, so don't ignore them. Change the tank water every time you use it, then empty and dry it afterward. That alone keeps slime and odors away inside for much longer.
When to buy, and how to get good deals on each shopping site
Microwaves have clear price cycles. The same model can vary by several thousand to over 10,000 yen depending on the time of year, so if you're not in a hurry, timing it pays off.
- New-life season (Feb–Apr): basic models and compact oven microwaves for people living alone tend to get cheaper. The time to target entry-level models.
- Big sale periods: Amazon Prime Day / Black Friday, Rakuten's Shopping Marathon (お買い物マラソン) and Rakuten Super SALE, and Yahoo! Shopping campaigns. The thing to watch for is high-end models from the previous year dropping sharply.
- Between model changes: makers generally release new models about once a year. Clearance of old stock tends to appear around new-model announcements. If you don't need the latest features, last year's model is the sweet spot.
By site: Rakuten is great for stacking point multipliers by shopping at multiple stores, and the more expensive the purchase, like an appliance, the bigger the points return. Amazon's appeal is how deep the sale discounts go, and prices on previous-year high-end models tend to fall. Yahoo! Shopping's PayPay rewards can get boosted during campaigns. Reward rates, annual fees and point caps change over time on every site, so always check each site's current terms before comparing. Comparing by "effective price" including points, not just the sticker price, keeps you from making the wrong call.
Microwaves are big and heavy, so comparing the total including shipping, installation (taking away your old unit) and extended warranty narrows the differences. Whether you can snag a previous-year high-end model at its lowest price makes all the difference. Once you've decided on a series, jot down the model number and compare current prices and point terms side by side across several sites. That's the most reliable way to get a good deal.
If you wait until it breaks, you won't get to choose: new-model cycles and when to act
We covered sale cycles in the previous section, but there's another factor affecting when to act with this appliance: a microwave is the kind of appliance where daily life grinds to a halt the moment it breaks. Not as badly as a fridge, but morning bento and evening reheating suddenly become a pain, so if you start shopping after it breaks, you tend to end up buying whatever's in stock without time to compare. The result is a unit that compromises on capacity and interior design, sitting in your kitchen for years. That's the outcome to avoid most.
Most makers update models about once a year
Major makers update their high-end oven microwave series about once a year. Timing varies by maker: some series launch in spring to early summer, others arrive for the autumn peak season. What's common is that once a new model is announced, the previous year's model moves to "while stocks last". In many years the changes are just added auto menus or better app integration, and if the core, like the sensor and steam system, is unchanged, the previous year's model is effectively the one to target. Conversely, in a year when the interior design or sensors are overhauled, the new model is worth it even at a higher price.
Telling them apart is simple: line up the old and new spec sheets on the maker's product page and compare just these items.
- Sensor type (infrared / weight / temperature), plus how many zones and where they're placed
- Interior capacity, whether two-level cooking is possible, and the number of trays
- Whether the superheated steam and steam supply method has changed
- Maximum temperature, and how long it can hold that temperature
- External dimensions and the required installation space
If these are the same and the only differences are the number of auto menus or colors, being one model year older makes almost no practical difference. On the other hand, if the external dimensions or required installation space have changed, watch out: it may not fit where your current one sits.
Scout ahead while it "still works"
A realistic approach we recommend: once your current unit shows signs of wear, narrow down 2–3 candidates, without committing to buy yet. Slow heating, odd noises, a badly fitting door: there's usually some time between these signs and the unit dying completely. Use it to measure capacity and installation dimensions and settle on candidates, and you'll be able to act without hesitation when the time comes.
Around the New Year holidays and long holiday periods, delivery and repair visit schedules fill up fast. Spending several days at year-end unable to heat anything is harder than you'd think, so if you have concerns in autumn, it's safest to act early. Conversely, during the new-life season, basic and small-capacity models sell fast, and popular colors and sizes tend to run low first.
Get the order right with moving or renovating
Another common timing mistake is buying before your new home's measurements are confirmed. For oven microwaves, the space needed for installation, including top and back ventilation, is larger than the unit's external size, so it may not fit on a microwave stand or under wall cabinets, or the door may hit the wall when opened. If you're moving, measure the width, depth and top clearance of where the microwave will go during the viewing, and check the outlet location and whether there's a ground terminal before choosing a model. If you're planning a kitchen renovation, that's when the built-in dimensions get decided, so buy after the work is done.
On the other hand, if your current one works fine and its spot won't change for now, there's no reason to rush a replacement. With this appliance, rather than jumping in the moment the price drops, think of the best time to buy as when your installation conditions and usage are settled; that's how you end up with a unit you're happy with. Decide on candidates, then wait for the period when they tend to get cheaper. That order avoids mistakes.
FAQ
Should I buy a basic microwave or an oven microwave?
If you mostly reheat and defrost, a basic microwave is enough and great value. If you do oven cooking like sweets, toast or gratin even a few times a month, get an oven microwave. Rather than paying tens of thousands of yen extra for oven features you won't use, putting the difference toward a model with good sensors or another appliance usually makes people happier.
What capacity (liters) should I choose?
Rough guide: up to 20L for one person, 23–26L for two to three, and 30L or more for four or more or heavy oven use. But the surest way is to decide by whether your usual large plates and lunch boxes fit inside. Even for a small household, if you often heat large plates, a flat interior around 26L is easy to use.
What's the difference between a flat interior and a turntable?
A flat interior has no rotating plate and a level floor, so large plates and bento fit easily and cleaning is just a wipe. It's the mainstream for mid-range and above today. Turntables are common on cheap models and rotate to even out heating, but large containers hit the edge and don't fit well, and cleaning the plate is a hassle. If in doubt, go flat.
How much do sensor types affect reheating?
A lot. Weight sensors get thrown off by the container's weight and struggle with accuracy, while temperature (infrared) and steam sensors read the food directly, so heating is more even. The more you rely on the auto-reheat button, the happier you'll be with a mid-range model with good sensors. If you set the wattage manually, a cheap model is fine.
What makes high-end lines like Healsio or Bistro different?
Each maker has its own philosophy. Healsio (Sharp) focuses on healthy cooking that steams and removes oil with superheated steam, Bistro (Panasonic) on speed cooking, and Ishigama Dome (Toshiba) on high-temperature baking that's strong for bread and sweets. Even within a series, only the top models have every feature and lower grades have features cut, so check the model year and grade.
Do I really need a superheated steam model?
It's worth it if you regularly steam, meal prep, or cook low-salt or oil-free. If you won't steam even once a month and mainly reheat, you don't need it. They're expensive and bulky, so decide based on "I'll do it every week," not "maybe someday." Results vary by model and ingredient and can't be guaranteed, so check each maker's official site for features.
Can it replace a toaster?
An oven microwave with an oven/grill can toast bread and brown gratin, saving space. But some take a few minutes to preheat, so if you toast several slices every morning a dedicated toaster may be faster. If you only toast occasionally, use the microwave; if you toast often, using both is convenient.
Any tips for cleaning?
Wiping up grime and spills inside after every use prevents odors and smoke. For stuck-on grime, heat a heat-resistant container of water and let the steam loosen it for easier wiping. Flat interiors have few bumps, so they're easy. Leaving grease can even cause fires, so clean often. On steam models, the interior cleaning function makes it easy.
Should I worry about electricity costs or tripping the breaker?
Short reheats have a relatively small effect on your bill, but oven cooking runs longer at high temperatures and uses more power. High-output models (1000W, etc.) can trip the breaker if used at the same time as other power-hungry appliances on the same circuit. Checking which circuit the outlet is on and how efficient your most-used functions are gives peace of mind.
My rental apartment has no outlet with a ground terminal. What should I do?
First, instead of using a power strip, check whether another kitchen outlet has a ground terminal. If none does, the reliable fix is having a licensed electrician add one. In a rental this falls under restoring the unit to its original condition (原状回復), so talk to your management company before any work starts. Using the appliance without connecting the ground wire is not recommended. Since it's used in a damp area, we recommend dealing with this promptly to reduce the risk of electric shock from current leakage.
Can a superheated steam oven also do normal microwave heating?
Mainstream countertop models generally have both superheated steam and microwave heating. However, some small, toaster-like water-oven-only models have no microwave function. If you want to reheat frozen rice or drinks, check the spec sheet for a microwave function (電子レンジ機能), plus maximum output and the auto-reheat sensor type, before you decide.
* This article is for reference only. Sale dates, point rates and campaign terms can change, so check each store's official page for the latest details.