A320 pilot reported a HYD Y SYS LO ECAM message on takeoff. After trouble shooting; the flight crew elected to perform an air turn back and make a precautionary landing at departure airport.

Narrative

On the takeoff roll; we received a caution and ECAM message 'HYD Y RES LO.' We elected to continue the take off as this was the safe option. We cleaned up and completed the after takeoff checklist. We ran the ECAM and QRH procedures uneventfully. After a SATCOM patch was initiated with Dispatch and Maintenance Control and in concurrence with all concerned parties; we elected to return to ZZZ. We were heavy weight so we had to burn down gas. Based on available landing distance and landing weight considerations; we elected to burn fuel down and land at a 158;000 pounds gross weight. Subsequent approach and landing were uneventful. We requested priority handling so that Crash Fire Rescue could be present and check the brake temperatures. Landing vertical speed was no more than 200 FPS. After landing; the brake temperatures never went above 500 degrees C. We taxied on our own power to local Gate X. Subsequent walk around inspection by both pilots revealed a blown hydraulic line in the Number 2 engine.