Guild Wars 2

Does Mantra of Recovery proc a rune effect ability that triggers when you use a healing ability (like runes of Dwana or air) every time you activate it or only when you charge it?

Activates, not Charges. However, most on-heals have a cooldown, so keep that in mind.

Actually, both the charge and activation will proc on heal effects. Esplen’s point about CD’s is valid as well.

Well, in regards to runes, you are correct, in regards to traits (Mender’s Purity) it’s activates, not charges. Silly ANet being inconsistent.

Here are two specifics. With Menders Purity, it removes one condition each time you use a charge (but not on charging). With Restorative Mantras, it heals all when you charge it (but not when you use a charge). With 6 Centaur Runes, it gives swiftness to those near year both on the re-charge and when using the charge. This rune gives 10 seconds of swiftness with a 15 second cooldown by default. The runes give 20% longer swiftness. So, with no other affects active, you get 12 seconds of swiftness – then you need to wait three seconds before using a charge again or just recharge the mantra (which takes 3.25 seconds).