To tear up a tiled floor by hand is not to be recommended. A demolition hammer makes it a lot easier. It runs on a cord, which means you always have a steady and constant energy supply.
From Machine Mart
Machine Mart Xtra Bosch GSH 5 CE 8.3J SDS-Max Professional Demolition Hammer (230V)
Kelvin Power Tools
Bosch GSH 5 CE SDS-Max Breaker