Thermal Carafe or Glass Jug? Choosing a Wilfa Coffee Maker

A thermal carafe used to mean the top of the range. Wilfa now makes two of them at quite different prices, so the choice is worth thinking about rather than assuming.

A thermal carafe keeps coffee hot for up to three and a half hours with no heat applied. A glass jug sits on a warming plate that switches itself off after 40 minutes by law. Wilfa makes two thermal machines: the Zense Alux Thermo at £249 and the Performance Thermo at £330.

The Wilfa range by carafe type

Every machine in that table brews at 92-96°C from the first drop to the last and is ECBC approved. The carafe decides what happens after that.

What a warming plate actually does

A warming plate doesn't preserve coffee. It carries on cooking it.

Coffee that sits on a hot plate keeps extracting and keeps oxidising. The bright, sweet notes go first, and what's left is the heavier, more bitter compounds. After half an hour you can taste the difference, and after an hour most people would rather make a fresh pot.

That's the real reason the 40-minute cut-off exists. It's an EU energy regulation and it applies to every machine sold here, but the coffee has usually stopped being worth keeping before the plate stops heating it. We've explained the rule in full in why your coffee maker switches off after 40 minutes.

A thermal carafe works differently. It's a vacuum flask, so it slows heat loss rather than replacing it. The coffee stays hot and stays as it was when it was brewed. Three hours later it's cooler than it was, but it tastes like coffee rather than like something that's been simmering.

The Zense Alux Thermo

The Zense Alux Thermo brews directly into a stainless steel thermo jug, and Wilfa says it keeps coffee hot for up to three and a half hours. It's £249 in black or silver, which puts it £81 below the Performance Thermo for the same three and a half hours.

The two-lid system is the detail worth knowing. A brewing lid sits on the jug during the brew to minimise heat loss while the coffee is arriving, and you swap it for a serving lid afterwards, which is designed to hold the heat better once you start pouring. Most thermal machines use one lid for both jobs.

Like the rest of the Zense and Performance range it uses pump technology, so the water system is emptied completely after every brew rather than leaving water standing inside between uses.

The Performance Thermo

The Performance Thermo at £330 is the larger, more powerful thermal machine.

For the extra £81 over the Zense Alux Thermo you get 1800W rather than 1650W, two heating elements, and a published 4-6 minute brew time. If you want the thermal carafe on its own, as a spare, the 1.25L Thermo Jug is £75.

Getting the best out of a thermal carafe

Three things make a real difference, and the first is the one everybody skips.

Preheat it. A cold stainless carafe pulls a surprising amount of heat out of the first coffee to arrive. Rinse it with hot water, empty it, then brew straight away. If your coffee has ever seemed not quite hot enough from a thermal machine, this is almost always why.

Learn the lid. The arrow lines up with Unlock to fit the lid, then turns to Lock to seal it. To pour, turn from Lock round to the spout symbol. If the lid won't come off, wiggle it gently side to side to break the vacuum rather than pulling harder.

Dry it properly. This is behind the most common "fault" reported on thermal carafes. Water gets trapped in the groove between the carafe's inner and outer sections after washing, then runs down the outside when you pour, which looks precisely like a leak. It isn't. Dry the seam and it stops.

Can you use a thermal carafe on a glass-jug machine?

Not during brewing. The dimensions differ, and a machine built around a warming plate expects a jug that sits on it.

You can use a thermal carafe as a serving vessel with any machine: brew into the glass jug, decant into the thermal carafe, and take it to the table. It's a reasonable halfway house if you already own a glass machine and the pot keeps going cold.

So which should you buy?

A glass jug, if the pot doesn't last

The Zense at £159 is the cheapest way into the range, and if you drink your coffee within the hour the carafe type is irrelevant. Glass also lets you see how much is left, which thermal doesn't. You're not buying worse coffee, because every machine here brews to the same standard.

The Zense Alux Thermo, if it has to last the morning

At £249 it's a £50 step up from the glass Zense Alux, and that £50 buys three and a half hours instead of forty minutes. If you brew a full pot in the morning and come back to it, work from home, or have a household that drinks at different times, that's the trade worth making. It's also £81 less than the Performance Thermo for the same time in the jug.

The Performance Thermo, if you want the bigger machine

At £330 it's the most powerful brewer Wilfa makes, at 1800W with two heating elements and a published 4-6 minute brew time. If you're brewing full pots daily and want the most capable machine rather than the best value, this is it.

Frequently asked questions

Is there a Wilfa Zense with a thermal carafe?

Yes. The Zense Alux Thermo brews directly into a stainless steel thermo jug and keeps coffee hot for up to three and a half hours. It's £249 in black or silver. The standard Zense, Zense White and Zense Alux all use a glass jug with a warming plate.

How long does a Wilfa thermal carafe keep coffee hot?

Up to around three and a half hours, on both the Zense Alux Thermo and the Performance Thermo. Preheating the carafe with hot water before brewing makes a noticeable difference to how long it holds.

What's the difference between the Zense Alux and the Zense Alux Thermo?

The carafe, and £50. The Zense Alux at £199 uses a glass jug on a warming plate that switches off after 40 minutes. The Zense Alux Thermo at £249 brews into a stainless steel thermo jug that keeps coffee hot for up to 3.5 hours and comes with separate brewing and serving lids. Both are 1.25 litres, ECBC approved and brew at 92-96°C.

Why does my Wilfa thermal carafe seem to be leaking?

It almost certainly isn't. Water gets trapped in the groove between the carafe's inner and outer sections after washing, then runs down the outside when you pour. Dry the carafe thoroughly, including the seam, and it will stop.

Can I use the Performance Thermo carafe with another Wilfa coffee maker?

Only as a serving carafe, not during brewing. The dimensions differ and machines with warming plates are designed around a glass jug. You can brew into your existing jug and decant into the thermal carafe.

Next

Every Wilfa filter machine holds water between 92 and 96°C from the first drop to the last, and every one is ECBC approved. The carafe only decides what happens afterwards, and how long you need the pot to last is the only question that matters.

Shop the Zense Alux Thermo · Browse all Wilfa coffee makers · What ECBC approval means