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Orestis,
Living in the same area as you do, I have battled dew for over 20years.
I used to use a hair dryer which meant running a 240v ext, cable to the scope. This is not the best arrangement. Then I bought a 12v hair dryer. Used early and often it would work, but also drains the battery quickly.
Now I use Kendricks, and set up at the beginning of a session, these heater straps are great, and the figure of the lens is not affected.
Having a 12" reflector, heater straps may either be expensive or not available for such a big mirror. You could try to make some yourself out of velcro and resistors.
Am not sure if a tube fan would do any good for a reflector, but be sure to place your scope pointing to horizon whenever you take even the shortest break away from the eyepiece. Do not leave it pointing to the zenith - the quickest way for dew to accumulate!
John
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