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Much of the layout and content taken directly from Formulas:Mana Regen

The rate at which health points regenerate is referred to as health regeneration. Akin to mana regeneration, there are many sources and characteristics of health regeneration.

Spirit-based Regeneration

Every two seconds, there is one tick of health regeneration, the value of depending on class and spirit:

Class	Health gained per tick
Druid	Spirit * 0.09 + 6.5
Hunter	Spirit * 0.25 + 6
Mage	Spirit * 0.10 + ?
Paladin	Spirit * 0.25 + ?
Priest	Spirit * 0.10 + ?
Rogue	Spirit * 0.50 + 2 Confirmed at level 60 patch 1.09
Shaman	Spirit * 0.11 + 7
Warlock	Spirit * 0.07 + 6
Warrior Pre-BC	Spirit * 0.80 + 6
Warrior BC	Spirit * 0.50 + 6

• At level 70, Warriors gain 1.1 spirit per point of spirit from an item/effect. This may or may not apply in full or part at lower levels, most likely not below 60.
• Health Regeneration is increased by 33% while sitting.
• Trolls regenerate 110% of this amount while out of combat, and 10% of this amount while in combat.

Combat

No health regeneration from spirit occurs during combat, with the exception of the troll (10% mentioned above).

Despite this, items either say "Restores X health [every|per] 5 sec." or "+X Health Regeneration" (some TBC items) will regenerate health at all times (even during combat). One point of "Health Regeneration" is the same as 1 health every 5 seconds.