Binding Heal

Binding Heal is a priest holy healing spell that heals the priest and the friendly player he/she has targeted for an amount. It heals for less than a Flash Heal per target, but cost the same mana and is an excellent spell to cast if both you and your target is in dire need of healing.

Numbers
Learned at level 48 for.

Binding Heal has a spell power coefficient of 40.3% per target.

Talent improvements
Holy tree talents:
 * Inspiration, reduces physical damage taken by 3/7/10% for 15 seconds after critically healed from Binding Heal.
 * Empowered Healing increase the healing done by Binding Heal by 5/10/15%
 * Serendipity, when you heal with Binding Heal, the cast time of your next Greater Heal or Prayer of Healing is reduced, and cost decreased.
 * Test of Faith, increases healing by 4/8/12% on targets below 50% health.

Discipline tree talents:
 * Twin Disciplines reduce the cost of Binding Heal by up to 10%.
 * Inner Focus, the spell costs no mana, and increases it's critical strike chance by 25%.
 * Divine Aegis procs off Binding Heal.
 * Borrowed Time affects the cast time of Binding Heal.

Tips and tactics
This spell is similar to a "double Flash Heal". It costs as much as a Flash Heal, has less throughput per target, but more combined throughput. As such, with its combined effects Binding Heal surpasses Flash Heal both in terms of throughput (HPS) and efficiency (HPM).

While Binding Heal and Flash Heal are very similar in terms of which effects they can trigger, there are a few talents which can only be triggered by Flash Heal (e.g. Grace). However, Binding Heal can trigger effects on both targets, which is particularly interesting in PvP, where it can apply Inspiration to both players.

If three or more targets are injured, multi-target spells like Prayer of Healing or Circle of Healing may be preferable.

Finding the perfect spot for Binding Heal can be difficult. In general, its high HPS and HPM makes it a good choice when both you and another target need healing. However, there are a few things to keep in mind:
 * If one of you is critically low, Binding Heal's comparably low single-target throughput can be a serious risk and a single-target heal may be the better option.
 * If the situation is safe, it can be better to wait for further targets to be hit, thus allowing the use of (more efficient) multi-target heals.

This spell causes half the threat per point of healing of other healing spells. If your tank has some major threat generation issues, healing him with Binding Heal is a viable way to reduce threat generation (since overhealing does not generate any threat). However, this is very mana intense.