The Striker finalised his loan move until the end of the season from Reggina yesterday.
Hearts then have first option to buy the striker for around €650,000.
Tullberg played only 5 games in Serie A but feels the SPL will suit is style. He said "My game is to hold the ball up and make space for the other striker. Before I have played with a smaller striker and that has worked well".
Tullberg becomes Manager Csaba Laszlo's second signing of the summer after the capture of David Obua.