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BLACK+DECKER 12-Cup Thermal CM2046S review

A four-layer vacuum thermal carafe that holds coffee two hours with no warming plate, plus a strength selector.

Where we land on it The only vacuum carafe on this shelf: four walls, two hours, no hotplate at all. If you have ever poured a second cup and tasted the plate, this is the machine on this shelf that fixes it.

What the maker puts in writing

  • 12 cups · 4-layer vacuum sealed thermal carafe
  • Hot for up to 2 hours, no warming plate
  • 24-hour auto brew, heating stops after brewing
  • STRONG button: slower, richer brew
  • VORTEX showerhead

The whole argument is the carafe

Seven machines on this shelf keep coffee hot by continuing to heat it. One keeps it hot by not letting the heat out.

That is the difference between a second cup that tastes like the first and one that tastes like a hotplate, and on this shelf there is exactly one machine on the right side of it.

What the trade costs

Two published hours rather than four. A preheat step the others do not need. And a carafe you cannot see through, so you find out it is empty by lifting it.

Availability

Read on the day this page was built: $63 at the American Amazon shop.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

What it gets right, and wrong

Strengths

  • The only thermal carafe on this shelf, and the only machine here with no warming plate to cook the coffee
  • A strength selector that works by slowing the brew rather than by changing the dose, described plainly
  • Heating stops on its own after brewing, so there is nothing left running

Compromises

  • Two hours is shorter than the four a warming plate on this shelf will give, so a thermal carafe is a trade and not a free upgrade
  • The listing asks you to preheat the carafe with hot water for best results, which is a step nothing else here requires
  • No wattage, no water capacity, no definition of a cup — although a sibling machine on this shelf defines one as five ounces

Where this one stands among its neighbors

At $63, it is the 6 cheapest of the 11 models in this category published here.

  • Least costly of the neighbors$27
  • Median$63
  • Most costly of the neighbors$490

Specifications

Capacity12 cups
CarafeDouble-walled, 4-layer vacuum sealed thermal
Keeps hotUp to 2 hours, with no warming plate
Programming24-hour auto brew; heating stops automatically after brewing
StrengthSTRONG button for a slower, richer brew
ShowerheadVORTEX design for even saturation
SpoutNo-drip
PowerNot stated by the maker
Water capacityNot stated by the maker
Amazon referenceB0C2JK9Y8V
EAN0050875827554

What people want to know

Is two hours worse than four?

It is a different two hours. A warming plate keeps coffee at temperature by continuing to heat it, which is what makes the second cup taste stewed. A vacuum carafe simply loses heat slowly. The published numbers favor the plate; the cup usually does not.

Do I really have to preheat it?

The maker says to, for best results. Rinsing a thermal carafe with hot water before brewing is standard practice and takes ten seconds. No other machine on this shelf asks for anything before brewing, because no other machine here has a vacuum carafe.

What does the STRONG button change?

The listing is specific and unusually honest: it brews more slowly for a richer cup. That is a contact-time change, not a dose change — you still put the same coffee in.

Compared with the neighboring coffee machines

These coffee machines share the category and the price bracket. Only what each one states is shown; an incomplete column would mislead.

Model Price CapacityProgrammingPower
BLACK+DECKER 12-Cup Thermal CM2046S $63 12 cups24-hour auto brew; heating stops automatically after brewingNot stated by the maker
Ninja 12-Cup Programmable CE251 $70 12-cup glass carafe24-hour delay brewNot stated by the maker
Mr. Coffee 5-Cup Programmable $48 25 oz, stated as up to two standard 12 oz cupsBrew Later, set ahead of timeNot stated by the maker
KRUPS Simply Brew 10-Cup $40 10 cups, 1.5 L / 51 ozNot stated by the maker — on/off button900 W

The difference between the models, in coffee machines

  • If price decides: KRUPS Simply Brew 10-Cup, at $40.

Today’s price and availability, for coffee machines

Details checked on October 30, 2026.

This one and its buyer, among coffee machines

Anyone who drinks the pot over an hour or two and has tasted what a hotplate does by the second cup

The coffee machines guides that feature it

What buyers actually choose

Amazon reports what buyers took in the month before this page was last checked: at least 5,000.

The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.

Sources

Specifications: the manufacturer sheet for coffee equipment and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.

The way we judge these coffee machines