The Truma 3002 is a gas heater, totally room sealed and will have automatic ignition as you turn it on and press the control down.
It will have a blown air unit fitted to it with the controls for the fan on the top of the fire.
The Ultraheat is an additional 2kw electric heater mounted behind the gas fire and controlled from a wall switch, if the Ultraheat is fitted tothe Adria.(a lot of european vans do not come with the Ultraheat as standard fitting)
The blown air unit already fitted will also work with the Ultraheat.