Praise be to Allah the Lord of the Worlds.
If the university`s administration bans using electrical appliances that consume a great deal of electricity, then it isn`t permissible for you to violate the university`s policy in this regard and transgress against its property. The evidence on this is that Allah says, "O ye who believe! Eat not up your property among yourselves in vanities: But let there be amongst you Traffic and trade by mutual good-will: Nor kill (or destroy) yourselves: for verily God hath been to you Most Merciful! If any do that in rancour and injustice,- soon shall We cast them into the Fire: And easy it is for God."{An-Nisa`, 29-30}.
However, if the university`s administration doesn`t object to that, then there is nothing wrong with your using that heater. And Allah the Almighty knows best.