Bosch Series 4 Built-In Under Counter Fridge

A fully integrated built-under fridge holding 134 litres behind your own cabinet door, with VitaFresh storage, SuperCooling and a notably quiet 35 dB running noise.

The KUR21VFE0G is Bosch's Series 4 built-under fridge, designed to disappear into an 82 by 60 cm niche behind a matching furniture door. There is no freezer compartment at all, so the full 134 litres goes to fresh food, which suits kitchens where a separate freezer or a fridge freezer elsewhere already covers frozen storage.

Two things stand out. VitaFresh gives fruit, vegetables and fresh produce conditions aimed at keeping them in good order for longer, and at 35 dB(A), noise class B, this is a quiet appliance by the standards of an under counter fridge. Three shelves, two of them adjustable, sit above two door bins, and the LED lighting uses a soft start so it does not dazzle.

Ideal for

Fitted kitchens

Fully integrated behind a furniture door in an 82 by 60 cm niche, with a flat hinge, it keeps a run of cabinetry unbroken rather than announcing itself as an appliance.

Second fridge

With no freezer taking up space, all 134 litres are usable chilled storage, which makes it a good island or utility fridge alongside a main fridge freezer elsewhere in the house.

Quiet kitchens

Noise class B at 35 dB(A) puts it among the quieter under counter fridges, which matters in an open-plan room where the kitchen and living space share the same air.

Key features

134 L of fridge

The whole cabinet is chilled storage, split across three shelves, two of them adjustable, and two door bins, with no freezer compartment eating into the volume.

VitaFresh storage

Bosch's freshness system creates better conditions for fruit, vegetables and other perishables, so a weekly shop holds its condition rather than wilting by Thursday.

35 dB(A) noise class B

Among the quieter appliances of its type, which is worth having when the fridge is only a couple of metres from where you sit and talk.

93 kWh per year

Bosch's stated annual consumption on the current EU label, placing the appliance in energy class E for a 134 litre integrated fridge.

SuperCooling and door alarm

SuperCooling drops the temperature to chill a fresh shop faster, while the door open alarm tells you if the fridge has been left ajar behind a closed cabinet front.

Flat hinge fitting

The flat hinge system fixes a furniture door directly to the appliance, and the hinge side can be swapped from right to left to suit your layout.

More to know

Fitting an 82 cm niche

Built-under appliances live in a 82 by 60 by 55 cm opening beneath the worktop, and this one measures 82 by 59.8 by 54.8 cm. That leaves the standard clearances Bosch expects, and the flat hinge takes a furniture door on the front so the fridge reads as another cupboard. Plan the door and handle with the rest of the run, because the appliance carries no finish of its own. A stainless steel attachment door, KUZ20SX0, is available as an option.

Why no freezer can help

Plenty of kitchens already have frozen storage covered, whether by a tall freezer in the utility or a fridge freezer in the main run. In that situation a freezer compartment in an under counter appliance is dead space. Giving all 134 litres to chilled storage means three full-width shelves, two of them adjustable, and two door bins, which is a more useful arrangement for daily cooking than a small ice box you rarely open.

Freshness, noise and running cost

VitaFresh is Bosch's name for the storage conditions inside the fridge, aimed at holding fruit and vegetables in better shape for longer than an ordinary shelf. On the running side, the appliance is rated at energy class E and 93 kWh a year, and at 35 dB(A) it falls into noise class B. That combination matters most in an open-plan kitchen: a fridge you cannot hear, tucked under the worktop, with a weekly shop that stays usable to the end of the week.

Specifications

What's in the box

• Built-under fridge x1
• Installation/user manual x1