Vaillant aroTHERM plus Quick Manual page 8

Installation and R290 clearances
Protective zone
There must be no ignition sources, such as plug sockets,
lamps or rotary insolation switches in the protective zone.
Air vents to void areas and air tight drains can be within the
protective zone.
8 8
A
B
When placing the unit you must be aware of drains and
openings.
In the unlikely event of a refrigerant leak the gas needs to be
allowed to disperse to stop the risk of the gas igniting.
Follow the diagrams below to ensure adequate clearance.
Minimum clearances
A
B
C
D
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A
B
Unit Dimension
mm 2100
mm 3100
mm 200/250
mm 1000