LogFAQs > #951713556

Also not just for heals but for any AoE, you can figure out if it is 'worth it' to cast an AoE vs multiple regular heals by simply multiplying the potency by the number of targets, if any of the newer people here don't know.

So like if a single target is 240 potency and an AoE ability is 100 potency, it's worth it to start AoEing at 3 targets being hit because 100 x 3 = 300 potency, which is a 60 potency gain over using the single target.

For healing it can be a little more complicated than just an if=then situation since you can need to prioritize based on who is in danger, but for DPS its 99.9% of the time simply 'if there are X amount of enemies, use the AoE'. Generally the magic number is 3, but there are a few cases where 2 or 4+ are when you start AoEing so refer to your own abilities for that.