If a player is receiving two instances of the same healing effect, like Lucio's aura, Mercy's beam, Soldier: 76's zone, or Zenyatta's orb, do they stack?
What if a team had six Lucios standing in a point? Would they all be getting 6x healing?
Overwatch – Do Multiple Healing Effects Stack
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Best Answer
Does not stack. You can have both speed boost and healing songs at the same time though, and Amp it Up can be staggered by different Lucio to provided the stronger heal for longer period of times.
Yep, stacks.
Does not stack. Again, it's better to stagger them to provide a longer lasting Biotic Field.
Does not stack.
Any two different kinds of healing stack, and basically only Mercy's Caduceus staff stacks with itself, healing-wise.
I tested the Lucio, Mercy, and Soldier: 76 interactions myself during normal play. Also helps that my own observations and the Wiki's do not conflict with each other.