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Verdict in brief: The De’Longhi Diadema CTV3003.BK is a two-slot, extra-long toaster designed to handle up to four ordinary bread slices across its long openings. It offers progressive browning, defrost, reheat, bagel and cancel controls, plus high lift and a removable crumb tray. Those are published features, not independent performance results. Publicly available pages do not reveal a verified score for browning evenness, speed, consistency or safety, so this review focuses on what the model is, how its specifications fit a kitchen and what to check before buying.
The black-finish model is sold as the Diadema Onyx Black CTV3003.BK. De’Longhi calls it a two-slot toaster, while CHOICE and Currys describe it as a four-slice long toaster. Both descriptions refer to the same layout: two unusually long slots rather than four separate slots. You can place several standard slices in the openings, but it remains a two-slot mechanism.
What the De’Longhi Diadema CTV3003.BK is
CTV3003.BK is the Onyx Black version of De’Longhi’s Diadema long-slot toaster. The UK manufacturer listing identifies SKU 0230120148 and specifies two slots, 1500 W input, 220–240 V operation at 50–60 Hz and a 2.7 kg weight. The Australian listing uses the same model suffix and lists the same two-slot, 1500 W and 2.7 kg specification, although regional plug, warranty, stock and pricing details can differ.
De’Longhi positions the toaster as a style-led appliance with long openings for a wider range of baked goods. Its product description says: “The perfect mix of style and functionality, this timeless Onyx Black long-slot toaster is masterfully modelled to add an elegant touch to your kitchen, with an array of settings, adjustable progressive browning controls and long slots to fit any slice.” That is manufacturer positioning rather than an independent assessment.
#1 Best Overall
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- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
The practical question is whether you need long slots, not whether the toaster has four separate bays. If your household normally toasts two to four standard slices at once and also buys irregularly shaped bread, the format can be more useful than a conventional four-slot appliance. If everyone wants a completely separate browning setting at the same time, two independent long slots may be less flexible than four short slots.
Is it a two-slice or four-slice toaster?
It is physically a two-slot toaster. Each opening is long enough to accept more than one standard slice, which is why retailers may call it a “4-slice” model. The descriptions are capacity terms, not contradictory product identities:
| Label | What it means for CTV3003.BK |
|---|---|
| Two-slot | The manufacturer’s description of the number of long openings and heating channels. |
| Four-slice | A retailer or reviewer’s description of the approximate number of ordinary slices that can fit across the two long openings. |
| Extra-long slot | The openings are longer than standard single-slice slots, helping with long, artisan or irregularly shaped bread. |
Actual capacity depends on slice thickness and the bread’s shape. Four narrow slices may fit where two thick slices do not. Do not assume that four slices will receive identical heat or that every combination can be positioned without overlap; those outcomes require controlled testing, and the publicly visible product information does not provide it.
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The manufacturer lists button-based controls and the following functions. They describe what the toaster is designed to offer, not how evenly or quickly each mode performs.
Rank #2
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- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
| Function | Use case | What is established |
|---|---|---|
| Progressive browning control | Choose a lighter or darker toast level. | Listed by De’Longhi; no public independent consistency score is available. |
| Defrost | Toast bread taken directly from frozen. | Listed feature; frozen-bread results are not publicly disclosed. |
| Reheat | Warm toast without starting a full browning cycle. | Listed feature; no measured reheat temperature or timing is published. |
| Bagel | Use a bagel-oriented heating program. | Listed feature; the public listing does not specify which side is heated or provide a test result. |
| Cancel | Stop a cycle before it finishes. | Listed control. |
| High lift | Raise smaller items farther above the slot for removal. | Listed feature, useful for small slices; reach and travel are not independently measured. |
| Removable crumb tray | Collect crumbs for routine emptying. | Listed feature; no replacement tray compatibility has been confirmed. |
The bagel setting answers one of the most common buying questions: yes, it is included in the manufacturer’s published control set. The listing does not state whether the mode toasts one face only, so check the regional manual if that distinction matters to you.
Published specifications
| Specification | De’Longhi UK | CHOICE | Currys | De’Longhi Australia |
|---|---|---|---|---|
| Model | Diadema Onyx Black CTV3003.BK; SKU 0230120148 | DeLonghi Diadema 2 extra long slot toaster CTV3003.BK | Diadema CTV3003.BK | Diadema 2 Slice Toaster Onyx Black CTV3003.BK; SKU 0230120146 |
| Slot description | Two slots | 4-slice toaster | 4-slice long toaster | Two slots |
| Power | 1500 W | Not stated on the visible product summary | 1500 W | 1500 W |
| Voltage and frequency | 220–240 V, 50–60 Hz | Not stated | Not stated | 220–240 V; frequency not stated on the cited page |
| Weight | 2.7 kg | Not stated | 2.7 kg | 2.7 kg |
| Dimensions | Not stated in the cited UK summary | 43 × 22 × 23 cm | 467 × 252 × 257 mm (H × W × D) | Not stated in the cited Australian summary |
| Warranty | Check the regional listing | One year listed by CHOICE | Check the retailer’s terms | Check the Australian listing |
Sources: De’Longhi UK, CHOICE, Currys and De’Longhi Australia.
How large is the CTV3003.BK?
Published measurements do not agree. CHOICE lists 43 × 22 × 23 cm, while Currys lists 467 × 252 × 257 mm and identifies the order as height × width × depth. Converted to centimetres, the Currys figures are 46.7 × 25.2 × 25.7 cm. The difference may reflect measurement points, orientation or whether controls and protrusions are included.
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|---|---|---|
| CHOICE | 43 × 22 × 23 cm | Useful as a compact reference, but the page does not identify an orientation in the visible summary. |
| Currys | 467 × 252 × 257 mm (H × W × D) | Plan for up to 25.2 cm of stated width and 25.7 cm of stated depth, subject to the retailer’s measurement method. |
For a tight countertop, measure the space rather than relying on one number. Leave clearance around the appliance for the cord and for heat dissipation, and make sure the lever and browning controls remain accessible. The 2.7 kg weight is manageable to move for cleaning, but the long body occupies more continuous counter width than a narrow two-slot toaster.
Rank #3
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- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
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- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
What performance can—and cannot—be concluded
CHOICE’s public page lists the categories it measures for toasters: browning evenness, cycle-to-cycle consistency, multigrain bread, frozen bread, single-slice performance, ease of use, cleaning, toasting time and safety. The expert rating and numerical results are restricted to members. Consequently, no defensible public score can be given for CTV3003.BK’s evenness, repeatability, speed, single-slice behavior or tested safety.
This matters because long-slot designs can raise practical questions that specifications cannot answer. A slot may physically hold four slices yet brown the centre and ends differently; a frozen mode may take longer than a standard cycle; and a single slice may behave differently from a full load. None of those outcomes should be inferred from the feature list. Treat the toaster’s functions as capabilities to investigate during your own use, not as guarantees.
Using the toaster safely and consistently
The following routine keeps operation repeatable without assuming an unverified performance level:
- Place the toaster on a stable, dry, heat-resistant surface with the stated dimensions and cord route in mind.
- Check the rating plate and plug before connecting it. The UK specification is 220–240 V, 50–60 Hz; do not use an incompatible voltage supply or an improvised adapter.
- Center slices in the long slots. Avoid forcing bread that is too thick, folded or oversized, and keep fillings, icing and loose crumbs away from the heating elements.
- Select the browning level and, when appropriate, the listed defrost, reheat or bagel function. Start with a conservative setting until you learn how your bread behaves.
- Stay nearby during use. Use the cancel control if bread starts to smoke or the result is already dark enough, and disconnect power before attempting to remove a jammed item.
- Use the high-lift position for small slices rather than reaching into a hot slot with a utensil.
- Allow the toaster to cool, unplug it and empty the removable crumb tray regularly. Never immerse the appliance or insert metal objects into the slots.
These are general appliance-safety practices. Follow the instructions supplied with your regional model for any country-specific warnings.
Rank #4
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Cleaning and maintenance
The removable crumb tray is the most useful maintenance feature listed by De’Longhi. Empty it over a bin, wipe it dry and replace it only after crumbs and moisture have been removed. Periodically turn the unplugged, cooled toaster over a suitable surface to release loose crumbs, following the manual’s instructions. Do not shake it over a sink if that could introduce water into the appliance.
No separately orderable replacement tray or confirmed compatible spare part is identified in the available listings. If the tray is lost or damaged, contact De’Longhi support for your market rather than assuming a generic tray will fit. The same caution applies to the power cord and internal components; user repair is not an appropriate substitute for service guidance.
Power, plugs and regional buying checks
The UK listing specifies 1500 W, 220–240 V and 50–60 Hz. The Australian listing also specifies 1500 W and 220–240 V. A model bought in one market may have a different plug, warranty coverage or SKU from one sold elsewhere, even when the CTV3003.BK suffix is the same. Confirm all of the following before ordering:
- The voltage and plug match your household supply.
- The seller is offering the Onyx Black CTV3003.BK, not a visually similar Diadema variant.
- The stated warranty applies in your country and begins on the date and through the seller you are using.
- Shipping, returns and electrical certification meet local requirements.
- The dimensions fit your counter with room for safe operation.
Price and availability by region
Prices and stock shown on product pages are snapshots, not a universal current price. The UK manufacturer page displayed £149.99 and marked the toaster out of stock. De’Longhi Australia displayed $269 AUD with limited stock, while CHOICE listed $269 in its product information. Currency, tax, delivery charges, promotions and stock can change independently.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
| Listing | Displayed information | Buying implication |
|---|---|---|
| De’Longhi UK | £149.99; out of stock on the cited page | Check the live page or an authorized local retailer before planning a purchase. |
| De’Longhi Australia | $269 AUD; limited stock on the cited page | Confirm Australian plug, delivery area and warranty at checkout. |
| CHOICE | $269 listed in its product information | Use as a regional reference, not as a guaranteed current selling price. |
Before paying, compare the complete delivered cost and verify the exact model suffix. A lower headline price can be offset by an unsuitable plug, international shipping or weaker local warranty support.
Who should buy it?
Choose it if you value long-slot flexibility
The CTV3003.BK makes the most sense for kitchens that regularly toast long, artisan or irregularly shaped bread and still want the ability to load several ordinary slices. Its two long openings avoid the narrow-slot constraint of many compact toasters, while the progressive browning, defrost, reheat and bagel controls cover common use cases.
Think carefully if independent control matters
Because it has two long slots rather than four separately controlled slots, it may not suit a household where different people need markedly different browning levels at the same time. The published information also does not establish how evenly multiple slices brown within one long opening.
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The conflicting published dimensions make physical verification especially important. Use the larger Currys footprint as a conservative planning reference until you can confirm the measurement convention for the unit sold in your market.
Strengths and limitations
| Strengths | Limitations or unknowns |
|---|---|
| Two extra-long slots can accommodate a broad range of bread shapes. | It is not a four-slot toaster; capacity depends on slice size and arrangement. |
| Progressive browning, defrost, reheat, bagel and cancel controls are listed. | Independent test scores for evenness, speed, consistency and safety are not publicly visible. |
| High lift helps with smaller slices. | Published dimensions differ materially between CHOICE and Currys. |
| Removable crumb tray supports routine cleaning. | No confirmed replacement-tray source is listed. |
| 1500 W specification is consistent across the cited manufacturer and Currys listings. | Price, stock, plug and warranty are regional and change over time. |
Final buying advice
The De’Longhi Diadema CTV3003.BK is best understood as a long-slot, two-slot toaster with an approximate four-slice use case. Its feature set is substantial on paper, especially for buyers who need defrost, reheat and bagel modes or who frequently use bread longer than a standard slot accepts. The available specifications establish its power, weight, controls and cleaning design, but they do not establish browning quality or safety-test results.
Buy it when the long openings and Onyx Black design solve a real bread-fit or countertop need, after confirming the dimensions, regional electrical rating, warranty and live stock. If your priority is independently verified toasting performance, wait for access to a complete test report or evaluate the appliance under your own normal bread, load and browning conditions rather than treating the manufacturer’s feature list as a performance guarantee.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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