How to Heal Efficiently:
There are three basic healing styles for discipline which depend on the type of incoming damage, and are as follows. If you cannot heal the encounter with these strategies, you cannot heal that encounter at your current gear level OR you have DPS taking unnecessary damage. These rotations are produced by examining the efficiency of each heal in your repertoire, and considering the types of raid damage.
Efficiency (highest -> lowest; no overheal):
Divine Hymn > Prayer of Mending > Prayer of Healing > Penance > Smite (i346+) > Greater heal = Heal = Binding Heal = Smite (i333) > Binding Heal > PW:S >
Smite scales very well with gear, and at raid quality gear outstrips Greater Heal and Heal.
heals which have very poor mana efficiency given the spec and glyphs listed include flash heal, renew, and holy nova. These can be used situationally, but there are often better choices.
1. Low, predictable damage:
Main heal: Smite (Atonement) + Penance + PW:S for Rapture ONLY. + PoM if sufficient AoE to benefit. At high gear levels, Smite will outstrip Heal in efficiency when combined with effective Evangelism management (see bottom of post)
2. High, single target damage (3 or fewer targets in raids):
Main heal: Greater heal (making use of Train of Thought for reduced Inner Focus) + Penance + PW:S for Rapture ONLY, + PoM
3. AoE Raid damage:
Main heal: Prayer of Healing (Inner Focus) + PW:S for Rapture ONLY + PoM. This is a good time to use Power Infusion.
Inner Fire vs. Inner Will
Because the above healing strategies utilize very few instant heals (PW:S every 12 seconds, PoM in AoE situations, and the very occasional renew) Inner Fire provides superior efficiency compared to inner will and should be used in almost all situations. Inner will can be situationally useful for the movement speed, and in fights with a large amount of movement, however.