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Well the reasoning to include it would be that if the tank was the lowest on hp then the bounce would go to him, giving a 60% free crit heal on the tank greatly increases the amount healed and the mana efficiency per point healed. Especially when considering all the crit talents taken by a shaman for HW in this case.
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With 10% base critical, and +3000 healing Healing Wave will heal (3250 + (1.1071 * 3000)) * 1.1 * 1.18 * (1 + (0.24 * 1.4)) assuming the free crit heal lands on the tank. The total is 11395 healing.
With the same stats, Greater Heal will heal (4270 + (1.0571 * 3000) * 1.1 * 1.15 * (1 + (0.24 * 0.5)) assuming that the tank is low enough to trigger Test of Faith (almost certain given our assumption that he can usefully receive a 240% Healing Wave critical and is the lowest health in the raid when it lands). The total is 10543 healing.
Healing Wave has a cast time of 2.5s and a post-talent cost of 1520. Greater Heal has an effective cast time of 1.64s (given IHC haste up-time based on Greater Heal cycle) and a post-talent cost of 921.
That gives Healing Wave 4558 hps @ 7.49 hpm while Greater Heal has 6429 hps @ 11.45 hpm.
I'm not trying to get into a "Priests roxxor, Shaman suxxor" debate here. I'm trying to illustrate that what people are assuming about the nature of the talents has to be taken in the context of what all the various healers get.
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I'm not sure if the increase in +healing is a additive or multiplicative, though i am certain that someone here does, and will leave the math equations to those whom actually know what they are.
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Right now, empowerment talents are additive with coefficient. What they will probably do is change the base coefficients of healing spells to being around 60% more than they are now. Note also that pre-existing Empowerment talents appear to be getting buffed - in all likelihood, we're a build or two away from the Priest's Empowerment talent being raised to 40% empowerment (as they have already done with the Druid empowerment talents).
With 24% critical (10% base + 14% talents), the cost reduction on Elemental Focus for heals is approximately 16.89%. This would raise the hpm in the above example to around 8.76 (still substantially lower than 11.45 hpm from Greater Heal).