Webasto DBW 2010 Mode D'emploi page 22

The heater must not be operated:
All manuals and user guides at all-guides.com
GB
Danger of fire,
explosion and suffocation
The heater must not:
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! in filling stations and tank farms.
! in places where explosive vapours or dust may
build up (e.g. near fuel, coal, wood dust or cereal
stores).
! close to inflammable materials such as: Dry
grass and leaves, cardboard packaging, paper,
etc.
! in enclosed rooms (e.g. garages), not even via
the timer or Telestart.
! be exposed to temperatures of more than 110 °C
(storage temperature), otherwise the electronics
may suffer permanent damage.
! be operated without at least 20 % brandname
anti-freeze in the water of the heating circuit.