Buy the thermal KBGT unless you brew a full pot and finish it within the hour. Technivorm sells the same brewer with two carafes, and because the numbers come from one manufacturer for two versions of one machine, this is the cleanest way to see what a carafe choice actually costs. Both hold 1.25 liters — 40 oz, ten Moccamaster cups. The glass one sits on a heated plate; the thermal one does not, and that single difference reorganizes the whole machine.
The thermal version is two inches taller, an inch and a quarter narrower, 136 grams heavier, draws 75 fewer watts and switches itself off 12 minutes after brewing rather than after 100. It also costs slightly less than the glass one. The trade you are making is not really thermal against glass; it is a hotplate against no hotplate, and the hotplate is the thing that ruins coffee.
The exception is real, though. A glass carafe on a plate keeps coffee drinkable-hot indefinitely, which suits a household that empties the pot over ten minutes and wants the last inch as hot as the first. If that is you, the glass one is genuinely the better buy — and you can see how much is left.
Better for almost everyone
Image: Moccamaster USA
Moccamaster KBGT
Taller, cooler-running, no hotplate
Model
KBGT (79312)
Size
16.00 H × 11.50 W × 6.75 D in
Carafe
1.25 L thermal, no hotplate
Power
1400 W · off 12 min after brewing
Reasons to buy
No hotplate, so the coffee stops cooking the moment the brew finishes — the single biggest difference between a pot that tastes the same at 8:40 as it did at 8:10 and one that does not
1400 watts against the glass version's 1475, because there is no plate to keep warm, and it shuts itself down 12 minutes after brewing rather than running for 100
11.50 inches wide is an inch and a quarter narrower than the glass machine, which is the dimension a cramped counter usually cares about
The same brewer above the carafe, with a brewing temperature Technivorm publishes at 196 to 205°F and an automatic drip-stop basket
Handmade in the Netherlands with the same parts availability as the rest of the range, and the thermal carafe is sold separately as a spare
Reasons to avoid
16.00 inches tall, two inches more than the glass version, which is the wrong direction under a wall cabinet
A steel carafe hides how much coffee is left and shows nothing about the brew
4332 g against 4196, so it is the heavier machine to lift for descaling
Technivorm has published the argument for you. The thermal machine needs less power and shuts off sooner because it is not heating anything after the brew, and the coffee inside it is simply held rather than slowly reduced.
Two inches of extra height is the price, and it is a real one on a counter under a cabinet — the carafe is a vacuum flask standing where a glass jug used to sit. Measure the gap before you decide anything else.
Not the right fit if you empty the pot in one go and want to watch the level — see the KBGV.
14.00 inches tall, two inches shorter than the thermal machine, which is the version that fits under a cabinet
Glass, so you can see exactly how much is left and watch the pot fill, which sounds trivial until you have owned the steel one
The hotplate holds the pot at drinking temperature for the full 100 minutes before the machine switches itself off, which is what a household of four emptying a carafe over an hour actually wants
Technivorm's SCA and ECBC certification, an automatic drip-stop brew basket, and replacement glass carafes and lids sold as ordinary spare parts
Reasons to avoid
The hotplate keeps extracting and evaporating after brewing, and a Moccamaster pot left on it for an hour is measurably flatter than one poured into a flask
12.75 inches wide, the wider of the two, and 1475 watts drawn for as long as the plate is on
Costs slightly more than the thermal version despite the cheaper carafe
The glass machine is not the compromise version; it is the right machine for a specific pattern. If the carafe is emptied within twenty minutes by several people, the plate never gets long enough to do damage and the visibility is worth having.
For one or two people brewing a full pot, it is the wrong one. The coffee sits on a heater for an hour, and by the last cup the difference is not subtle.
Not the right fit if you drink a pot slowly, alone — see the KBGT.
Nobody brewed side by side for this page. Both machines' figures come from Technivorm's own US store, linked in Sources, and they are quoted in the units Technivorm publishes.
The comparison works because it is the same manufacturer describing two versions of one brewer: same 1.25 liter volume, same brew basket, same published brewing temperature. Every difference in the table is a difference the maker created.
Both product pages were checked for a live US cart on the day this was written, and both were buyable directly from Moccamaster USA.
The verdict
Buy the KBGT if one or two of you drink a pot over an hour or more. No hotplate means the coffee you pour at the end is the coffee that was brewed at the start, and the machine draws less power and switches off sooner doing it.
Buy the KBGV if a full carafe disappears quickly, if you want to see the level, or if your cabinet gap is under 16 inches. Two inches of clearance is a hard constraint and taste is a soft one.
Either way you are buying the same brewer. If you have not decided between a Moccamaster and something cheaper yet, our small-kitchen drip guide is the place to start.
The same: 1.25 liters, which Technivorm publishes as 40 oz or ten Moccamaster cups. A Moccamaster cup is 4 oz, so ten of them is about five ordinary mugs.
Does a thermal carafe keep coffee hot as long as a hotplate?
No, and it is not trying to. A hotplate holds the pot at serving temperature for the full 100 minutes the KBGV runs; a vacuum flask loses heat slowly from the moment it is filled. The point of the flask is that it holds without heating, so the coffee stops changing.
Why is the thermal machine taller?
Because a vacuum flask has double walls and a lid, and it sits where a thin glass jug used to. Technivorm publishes 16.00 inches for the KBGT and 14.00 for the KBGV, with everything above the carafe identical.
Which is cheaper to run?
The thermal one, on both counts Technivorm publishes: 1400 watts against 1475, and a shutdown 12 minutes after brewing instead of 100 minutes. That is roughly an hour and a half less heating every time you make coffee.
Can I put a thermal carafe on the glass machine?
Technivorm sells 1.25 L thermal carafes as separate accessories, and they are the right volume, but the two machines have different bodies and different brew-basket heights. Buy the machine you want rather than planning to convert one.
