If you are trying to save space in your kitchen without sacrificing cooking power, a compact built-in oven with microwave function is one of the smartest upgrades you can make. The NEFF N70 C24MR21G0B Built In Compact Electric Single Oven with Microwave Function in graphite grey is a good example of how far this category has come: sleek, versatile and designed to slot neatly into modern cabinetry. In this guide we will look at how this type of appliance works in real homes, how the C24MR21G0B fits into a wider kitchen plan, and which alternatives are worth a look if you are comparing options.
What makes the NEFF N70 C24MR21G0B different?
On paper, the NEFF N70 C24MR21G0B is a built-in compact electric single oven with a fully integrated microwave function. In practice, that means it can handle quick midweek reheats, proper baking and roasting, and combination programmes that use both technologies for faster, more even results.
With an impressive average rating of 4.7 from over 300 reviews, it is clearly doing something right for a lot of households. Rather than being just another microwave with a grill tacked on, this is designed to sit comfortably alongside a main oven in a tall cabinet stack, or to act as a primary oven in a smaller flat or open-plan kitchen where every centimetre counts.
If you want to dive deep into every feature, control and programme, it is worth reading our full review of the NEFF N70 C24MR21G0B Built In Compact Electric Single Oven with Microwave Function, which focuses purely on detailed performance and usability.
Why choose a compact oven with microwave instead of two separate appliances?
Many UK kitchens simply do not have the room for a full-height double oven plus a freestanding microwave on the worktop. A compact oven with microwave tries to solve that problem in three main ways:
- Space saving: You regain valuable worktop space by integrating the microwave into the oven housing.
- Flexible cooking: You can bake, roast, grill and microwave in a single cavity, often with combination settings to cut cooking times.
- Clean, built-in look: The appliance lines up with your other built-in units for a streamlined finish.
The C24MR21G0B leans into this flexibility. For everyday use, you might simply throw in a bowl to reheat leftovers on microwave-only settings. When you have more time, you can switch to its full oven modes for crispy roast potatoes, traybakes or small joints of meat. Combination programmes are particularly handy for family cooking: for example, using microwaves to cook through a lasagne while the oven element browns the top.
Pairing the C24MR21G0B with other ovens in your kitchen
Most people considering a compact oven with microwave will be installing it alongside a main oven, usually in a tall housing. One tidy approach is to use the compact model at eye level for day-to-day meals, with a larger oven beneath it for bigger gatherings and batch cooking.
If you like the idea of staying within the same design language, the NEFF N70 Slide & Hide® B54CR71G0B Built In Electric Single Oven with Pyrolytic Cleaning is a very strong partner. Its slide-and-hide door tucks neatly under the cavity, making it much easier to access heavy trays without leaning over a hot door. You can see how the cleaning system and cooking performance compare in our in-depth look: read our full review of the NEFF N70 Slide & Hide B54CR71G0B.
Prefer stainless steel over graphite grey? The NEFF N70 Slide & Hide® B54CR71N0B offers a similar package but with a classic stainless finish. If you plan to mix and match across a bank of appliances, that subtle difference can make or break the overall look. You can find out more about how it performs and cleans in our full review of the NEFF N70 Slide & Hide B54CR71N0B.
Graphite grey or stainless steel – which finish works best?
The hero model here, the C24MR21G0B, comes in a contemporary graphite grey. It is a sophisticated, slightly softer alternative to pure black, and works particularly well with darker cabinetry, concrete-effect worktops and modern handleless kitchens.
If you are building a matching bank of appliances, you have a near twin in stainless steel: the NEFF N70 C24MR21N0B Built In Compact Electric Single Oven with Microwave Function. Internally it is very similar, but the stainless finish may be easier to blend with existing appliances from previous kitchens or other brands. You can explore whether the stainless version is a better fit for your design by checking out our full review of the NEFF N70 C24MR21N0B.
When deciding between graphite and stainless, it is worth thinking about fingerprints and cleaning. Darker doors can be more forgiving of day-to-day smudges, while stainless often benefits from a quick buff to keep it streak-free. In either case, regular wiping with a soft cloth after cooking stops marks building up.
How the C24MR21G0B fits into a premium line-up
If you are putting together a high-end kitchen, you might also be considering premium ovens from other brands. For example, the Bosch Series 8 HBG7784B1 Built In Electric Single Oven with Pyrolytic Cleaning is a fully fledged, feature-rich main oven aimed at serious home cooks. While it does not include a microwave function, it offers advanced cooking modes, a generous capacity and powerful pyrolytic self-cleaning.
For households that love entertaining, one sensible layout is to use something like the C24MR21G0B as a compact combi oven above, with a larger oven such as the Bosch Series 8 HBG7784B1 beneath it. That way you get fast, efficient reheating and midweek cooking from the compact cavity, plus a large, highly capable oven for Sunday roasts and baking marathons. You can see where the Bosch model justifies its premium price in our full review of the Bosch Series 8 HBG7784B1.
Everyday cooking with a compact oven and microwave
Once installed, the biggest test of a compact oven with microwave is how it handles everyday life. The C24MR21G0B is aimed at busy households, so it helps to think about the real meals you will cook in it.
- Breakfasts: Speedy microwave oatmeal, grilled bacon, or toast-topping tomatoes under the grill.
- Work-from-home lunches: Leftovers reheated evenly, baked potatoes using a combination programme to shorten cooking time, or quick traybakes.
- Evening meals: Small roasts, pasta bakes and fish dishes using full oven modes, with the option to add a burst of microwave to move things along if you are late home.
- Batch cooking: While the cavity is smaller than a full-size oven, it is usually large enough for a standard baking tray or casserole dish, making it useful for batch sauces and one-pot meals.
Controls on this class of oven are typically designed to be intuitive, with clear programme icons and pre-set options. Spending 20 minutes with the manual at the start pays off: once you understand which combination modes work best for your favourite dishes, you can reliably shave time off your routine without sacrificing flavour or texture.
Cleaning and maintenance: what to expect
Even if your oven does not have full pyrolytic self-cleaning, there are design touches that can make maintenance less of a chore. Compact ovens often use smooth enamel interiors, removable shelf supports and accessible door glass panels that can be lifted out for soaking. Wiping down the interior regularly after splatters is particularly important in a combi oven, as microwaving can bake on food quickly.
If you decide to pair the C24MR21G0B with a self-cleaning main oven such as the NEFF N70 Slide & Hide® B54CR71G0B or the Bosch Series 8 HBG7784B1, you can keep the bulk of messy roasting in the pyrolytic oven and use the compact one more gently. That way, the appliance that is trickiest to deep clean stays relatively fresh, while the one that looks after itself does the dirty work.
Energy use and running costs
Energy labels tell part of the story, but how you cook day to day makes the biggest difference. Compact ovens with microwave functions are often more efficient for smaller meals, because you are heating a smaller space and can rely on microwaves for faster heat transfer.
Some simple habits help keep bills in check:
- Use microwave-only or combination modes for reheating and small portions instead of heating the full oven.
- Avoid over-preheating; many combination programmes are designed to start from cold.
- Cook multiple items together where smells and flavours allow.
- Keep the door seal clean and in good condition so heat stays in the cavity.
With a model like the C24MR21G0B, this combination of flexible programmes and smaller cavity can make it your go-to appliance for most meals, leaving the main oven for genuinely big jobs.
Planning your cabinetry and installation
Before ordering any built-in oven, it is sensible to double-check cut-out dimensions, ventilation spaces and cabling with your kitchen designer or installer. Compact ovens like the C24MR21G0B usually fit into a standard 45cm-high niche, often above a 60cm main oven or within a column of appliances that might also include a warming drawer or coffee machine.
If you are swapping out an old unit, confirm that your existing carcass can support the weight and has a suitable opening. If you are building from scratch, think about whether you want the compact oven at eye level for easier monitoring, keeping the main oven slightly lower for bigger roasting trays. A qualified electrician should always make the electrical connection, and they can advise on any circuit upgrades if you are adding more powerful appliances.
When to consider alternatives to the NEFF N70 C24MR21G0B
While the C24MR21G0B is a strong option, it is not the only way to achieve a flexible cooking set-up. You might lean towards the stainless steel NEFF N70 C24MR21N0B if you already have a run of stainless appliances or prefer a brighter, more traditional finish. Our full review of the NEFF N70 C24MR21N0B breaks down where the two compact models differ in everyday use.
If you are less interested in microwave functions but want the easiest possible cleaning and a roomy main oven, the NEFF N70 Slide & Hide® B54CR71G0B and B54CR71N0B or the Bosch Series 8 HBG7784B1 are worth shortlisting. All three offer pyrolytic cleaning, where the oven effectively burns off residues at very high temperatures so you can wipe ash away afterwards. They are best seen as partners to, rather than replacements for, a compact combi oven, giving you a flexible and future-proof kitchen set-up.
For an in-depth breakdown of how the C24MR21G0B behaves in real kitchens, including control layout and cooking tests, it is worth reading our full review of the NEFF N70 C24MR21G0B compact oven with microwave function alongside this broader buying guide.
Final thoughts
Choosing the right built-in oven is as much about how you cook as it is about technical specs. A compact oven with microwave function like the NEFF N70 C24MR21G0B lets you reclaim worktop space, speed up everyday meals and enjoy the look of a fully integrated appliance wall, especially when paired with a self-cleaning main oven.
Whether you are drawn to graphite grey, tempted by stainless steel alternatives, or considering pairing it with a premium full-size oven, there is a configuration that will suit your kitchen and cooking style. Use the detailed product reviews linked throughout this guide to compare features calmly, and you will be well on the way to building a cooking set-up that feels like it was designed just for you.