Draining The Heating System - Vaillant ecoTEC pro Operating Instructions Manual

5 Operation
5.7.2

Draining the heating system

Another way to protect the heating system and the boiler
from frost when they are switched off for a very long time
is to drain them. You must ensure that the heating installa-
tion and boiler are completely drained.
All the cold and hot water pipes in the house and in the
boiler must also be drained.
> Ask your heating engineer to drain the heating installa-
tion.
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Operating instructions ecoTEC pro 0020129673_00