Thanks for clearing this one out for me.
Apparently the guys at the store knew nothing about what they were talking...or knew something but were not just so sure. :-?

Cuz they said the transformator they had gave out 24V@6amp but wanted me to check how many Volt-amperes or Watts it should output.

Can´t they count?(24V at 6A = 144VA/144Watts) , they should know this i guess..

Or maybe they played a trick on me.. ..i´m going to another store.