Miele H6500BM Operating And Installation Instructions page 110

Microwave defrosting, reheating and cooking
Tips on reheating

Danger of burning. Food for
babies and children must not be too
hot.
Heat baby food for only approx.
30-60 seconds at 450 W. You can
also use the food probe for
temperature controlled heating.
Pressure can build up when
reheating in sealed containers,
causing the container to explode.
Do not cook or reheat food or liquids
in sealed containers, jars or bottles.
With baby bottles, the screw top and
teat must be removed. Otherwise
pressure builds up which can cause
the bottle or container to explode,
posing a severe risk of injury.
Never reheat hard boiled eggs using
the Microwave solo function 
even without the shell. The eggs can
explode.
110
When heating liquids, milk, sauces
etc, using microwave power, the
boiling point of the liquid may be
reached without the production of
typical bubbles. The liquid does not
boil evenly throughout.
This so-called 'boiling delay' can
cause a sudden build-up of bubbles
when the container is removed from
the oven or shaken, which can lead
to the liquid boiling over suddenly
and explosively. The formation of
bubbles can be so strong that the
pressure forces the oven door open.
To avoid this, stir liquid before
heating it up. After heating it up wait
for at least 20 seconds before
removing the container from the
oven. Placing a suitable glass rod or
similar utensil in the container can
help prevent it from boiling over.