We can keep Burning Rush up indefinitely now for old dungeons.

[Lime]

Fighter Chow was recently changed to a static value. It recovers 1942 HP every 5 second regardless of max HP. Burning Rush is still percentage based.

If you take off your gear, it will keep you topped off. While not useful for current content, it greatly offsets the nerf to bear tartare with the prepatch.

You need to be at about ~15,500 HP to ignore the Rush.

Edit - That HP value is for Demo, which gets passive healing from having a pet out. Destro seems a bit lower. Still testing values.

Edit 2 - It seems that it does scale with your HP or some stat to some degree, but it will not override itself. If you get the buff with your gear on, then take you gear off, it retains the high regen value. That said, even without that method, it still provides way more than enough HP regen while undergeared. Corrects itself upon zoning. Still, it's 1883 HP at 10.7k HP. More than enough to sustain it indefinitely.