As the question says. What build is the best healer in the game? Generally the life cleric seems to be the best (low levels healing feat is great).
I'm not 100% sure how disciple of life works though for multiclass clerics. For example a MB lore Bard6/Life Cleric one picks up goodberry and aura of vitality via the magical secrets ability. IN theory you gain +2 hp healing per level of the spell.
Good berry gives you 10 berries at 1/hp each per berry, RAW it now seems to give you 3 hp per berry. Aura of Vitality gives you 2d6 healing per round for 10 rounds, with the life cleric level that would seem to be 2d6+6 roughly doubling the spells hit points of healing.
So if correct would a lore bard who keeps stealing cleric spells be a better healer than an actual life cleric? Or some weird Druid/Cleric/Lore Bard be even better as you copuld get goodberry via a single level of Druid and take Aura of Vitality and Prayer of Healing as your bard magical secret spells at level 6?
Disciple of Life gives you a bonus of 2+Spell Level to your healing spells (of 1st level or higher). It doesn't specify any particular class' spell list, so it still functions with multiclass spells (by RAW anyway).
Goodberry gives 1 hp normally. With DoL it would give 4 hp per berry (1 + 2 + spell level).
Aura of Vitality gives you 2d6 normally. When boosted with DoL, it would give 2d6+5 (2d6+2+spell level).
Personally, I have no problem with this. If the character wants to multiclass into a specific build to be awesome at something, then they should be awesome at it. But also keep in mind that the character went 6 levels into Bard when they could have taken 6 more levels into Cleric. Preserve Life (Life Domain ability) works off of CLERIC level. And the level 6 Life Cleric ability is nice too. It lets you heal yourself for free when you heal someone else.
Another method: Instead of taking Bard to get Aura of Vitality, it might be better to take levels in Paladin instead. Yes, you have to wait a few more levels for the spell, but you get Lay On Hands and Aura of Protection in the meantime. Imagine having Lay on Hands AND Preserve Life....that's a LOT of healing.
don't forget by multiclassing more then just a lvl dip, you will miss the higher level spell (spell lvl 8-9), yes you can still cast cure wound as a spell lvl 9 but you will not get true ressurection or miracle, or heal.
Asking for a miracle to bring all your ally (even the fallen one) back to 100%HP and cure all ailment can be risky, but will beat any other healing spell.
Are you talking in-combat, or out of combat?
All I know is that I find playing a "healer" extremely boring! 
I never do when I'm a player (and I like paying Clerics in 2e and 3e but I seldom memorize many healing spells), and when DMing my players almost never do either. Having a couple healing spells at hand happens often in our games, but people never actually play a "healer", meaning a guy that focus on healing others almost all the time.
Frankly, if the party is needing that much healing they're likely doing something weird.
If you play your combats smartly even a cleric is more useful helping with other sorts of spells or attacking.
While healing is more useful for when things go wrong for some reason.
Rastapopoulos wrote:
mellored wrote:
Channel Dvinity: Preserve Life, and also Blessed Healer, are both very useful for the healer. Not saying they are more useful than the two spells you mention, and personally I think the Bard is more fun to play than the Cleric often in this game. Just noting both are good. Preseve Life in particular has saved our groups butt multiple times, since it can be done at range during combat to revive multiple people who just went down. Aura of Vitality can do that as well, but obviously not until later level, and uses a 3rd level slot.
Sorxores wrote:
Zardnaar wrote:
mellored wrote:
Regeneration can be pretty amazing if you count how much damage is negated by the death rules.
i.e.
you have 5 hit points,
your hit for 20 and drop,
regeneration puts you at 1
= 15 HP "healed".
Similar with death ward.
You take 100000 damage, and end up with 1 HP.
It also depends if your talking about a 1 time heal, mass heal, or heal over time.
i.e. the healer feat can heal 27.5 per turn, at will, at level 1. As long as you have a continuous supply of wounded level 20 creatures and healing kits.
Edit: Or 37.5, if you can a continus stream of wounded terrasques.
FFSAA wrote:
I feel focusing on just healing is a mistake. If the character isn’t dealing damage, buffing, or otherwise helping out the party then the extra healing isn’t making up for the extra attacks the party will be taking because their “down” one character.
I’m not saying that making a life cleric is wrong, but it’s important to have secondary and tertiary strategies as well.
Theros wrote:
I am a fan of life cleric 1 / lore bard 19. That gives more than just healing benefits to the bard while increasing healing a lot, allows for the strongest spell list, and doesn't cost an ABI. Edit: human variant to pick up healer at first level and inspiring leader at the 3rd ABI after CHA increases twice.
There is Song of Rest as well, which adds something to this build in a minor way.
If the best healer =/= the caster with the highest healing per round then I would go with a Ranger and a butt load of Cure Wounds scrolls. I dunno, I like the idea of keeping your teammates free of damage in the first place. But whatever.
This thread still alive lol. Kind of continued here.
http://www.enworld.org/forum/showthread.php?386717-How-to-Heal-Uber-Damage&p=6448424#post6448424
Ashrym wrote: