Page EN-11
The hob
Operating principle of an
induction hob
Located beneath the glass ceramic surface
is a coil, through which current flows. This
coil generates an alternating magnetic field.
This induces eddy currents in a metallic pot
placed above it, which heat up the metal of
the pot and from there, heat the contents of
the pot through heat induction. The induction
currents therefore make the pot itself a heat
transmitter. Although the surface of the glass
ceramic hob heats up, this is not as a result
of the electric field, but as a result of the heat
that emanates from the pot.
Induction technology has two main advantag-
es:
– Since heat is generated exclusively in the
pot, maximum heat utilization is ensured.
– There is no heat inertia effect: The cooking
process begins as soon as a pot is placed
on a cooking zone, and it ends when the
pot is removed from the cooking zone. In
this way, the cooking process is much fast-
er, which saves energy.
Noise emission with hob use
Induction-heating technology relies on the
property of certain metals that allows them to
vibrate when high-frequency waves are ap-
plied to them. In some circumstances these
vibrations can generate sounds. None of
these sounds arise from any technical fault,
nor do they indicate poor quality. They are
simply related to the induction technology.
They will have no negative impact on the pots
or the hob.
Possible noises:
– Low humming noise like a transformer
This sound may occur when a high heat
setting has been selected. The cause of
this is that a large amount of energy is
transferred from the hob to the cooking
device. The sound will disappear or be re-
duced as soon as the heat setting is re-
duced.
– Quiet whistling
Quiet whistling can occur when empty
cookware is placed on a cooking zone.
It disappears as soon as water or food is
placed in the cooking device.
– Crackling
This noise can occur when cooking appli-
ances have layers made of different mate-
rials. The noise is caused by vibrations at
the joints of the different material layers.
This noise occurs in the cooking device
itself. The sound may change depending
on the type and quantity of the food being
cooked.
– High-pitched whistling sounds
These noises may arise primarily with
cooking devices that are made of different
materials and specifically in the event that
these materials are used at maximum heat
setting on two adjacent cooking zones. The
noise will decrease as soon as the heat
setting is reduced.
– Whirring
Depending on the pot, volume or temper-
ature, a slight whirring noise may occur
when cooking on the induction hob.
With some pots, this noise may only arise
while they are heating up, and with others,
only once they are warm; in some, the
noise will arise only when the fill level is
very low and in others, only when they are
completely filled. The noise may be contin-
uous or may occur at intervals. It can occur
in the same pot on one cooking zone, but
not on another. Even when using the same
pot on the same cooking zone, the noise
may not occur every time. It may occur
when a specific pot is in a certain position
on the cooking zone – and may not occur
again the next time.
– Fan noise
A certain ambient temperature must not be
exceeded in order for the electronics inside
the hob to work properly. For this reason the
hob is equipped with a fan, which switches
The hob
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