We use between 7 and 10 healers, with 8-9 being the most common. 7 Akama, 8 on Supremus/Teron/RoS, 9 on Illidan/Council/Najentus, and 10 on Gurtogg/Shahraz.

Edit: Whoa being stupid, sorry. 8 for Rage, Anetheron, Kaz and Azgalor. 9-10 for Archimonde. Sometimes roll with 9 on Azgalor.

I'd love to see your Black Temple some day then .

To answer the question, we've been using 7 healers, but swap in 1 more for Archi.

7 in Hyjal mostly... we always make our Feral go healing, and sometimes our Enh Shammy too, generally someone will d/c or have to go towards the end (Az/Archi) where we get +1.

Would say for the most part; running 8 for MH and BT with the option of having a Hybrid switching gear on the few encounters which need it is the easiest setup to follow with from experience, despite us generally running 7.

I'ld recommend recruiting another healer or two if the most you have is 5-7.

Several servers including mine was restarted some minutes ago, probably due to this issue.

We only got into BT a week or so ago and only have Najentus, Supremus, Akama and also rage of course in hyjal down and we go with 7 healers. Usually two priests, two paladins, 2 shamans, 1 restodruid, sometimes three shamans instead of resto, sometimes three palidans. Fights like najentus though at least first night became a bit of a drain on our healers when we brought no shadowpriests.

Akama behaved normally on yesterday's run. Also, there were a couple of wipes on Teron due to some people not getting the new main action bar change, me included. I didn't even get a pet bar like I used to, but it could be an UI issue. It's a shame that issues like this can lead to instant wiping.

I prefer to run a heavy DPS raid where I can. The normal amount of healers is 6-8. We use 6 for Rage, Anetheron, Kazgoral, Supremus, RoS and Akama; 7 for Naj'entus, Teron and Azgalor; and 8 for the rest.

Anetheron with 6 healers sounds painful. All the others, I concur: 6 is plenty for Akama, Supremus, and Rage; 7 is plenty for Naj and Teron. Mostly we tend to run 7 for Naj->Teron, just because it's easier than sitting one, and lowering your dps by one on Sup or Akama is not really a big deal. Not like they're hard fights.

I'm also curious as to how Anethron is handled with so few healers, we've taken no less than 8 on any of our kills, and whenever we attempted with with less, our healers were over-whelmed and we lost too many people.
I can imagine however, it being possible with an extremely aware raid, but I wouldn't like to take chances on something like that.

Our first ever kill was with 6 and we've done it with 6 quite a few times. Usually do something like 2 healers MT, 1 healer on infernal tank, 3 on raid. We have all the ranged stay way back out of carrion swarm range and just kill internals, meele will kill him.

We regularly do him with 6 healers, and have killed him with 5 healers before, of course with 5 healers it isn't easy.

It seems like people run with a lot fewer healers then we do. 8 is our standard for most things, we've used 7 for vashj and kael, but 9 for HWN. I bet anetheron with 6 wouldn't be too unreasonable if everyone broke our their SR stuff like Maurador mentioned.

You're hurting yourself if you're going to be bringing that many healers for RoS. It's a huge DPS race and you are most likely going to find yourself short DPS learning RoS with that number of healers. I personally suggest 7 healers, it seems to be the perfect number for that fight.

We learned RoS with 9 healers, and until last week every kill was 9 healers (our only shaman specced enhancement last week for fun, I guess).

In the end, it's probably best to feel out what works for you. Some guilds prefer more DPS and less healers, some guilds prefer more healers and less DPS. I've always felt that more healing gives you more control, and I suspect that's my guilds reason for bringing 8-9 healers to every boss fight.

9 on Najentus and 10 on Gurtogg/Sharhraz is really overdoing it. We did Gurtogg once with 11 healers and it was more painful than the usual 8 healer set up we use.

Aside from Essence, everything is doable and probably optimal to have 8 healers in. a 9th wouldn't hurt on Gurtogg/Council and dropping to 7 helps some of the easier boss, but they're so easy it doesn't even matter. Our raids always include 8 healers with an elemental shaman healing on Gurtogg and Council. Completely eliminates the need to sub so many times during a night. We used to start with 7 until essence then 8 for the rest, but we outgear it now that our dps meets the required level even with 8 healers.

For learning, though, it would make sense to change the setup per boss since the boss will take a few hours instead of the 10 minutes it takes for farming guilds. And I'd recomment 8 for Azgalor/Archimonde/Illidan/Naj'entus and 9 for Council/Gurtogg/Shahraz. 7 for the rest.

akama was still bugged for us yesterday evening - Drak'thul -EU

edit:
7 healers for BT (2 resto shammy, 2 resto druid, 2 holy pala, 1 holy priest)
1 more maybe for heal heavy fights (or ele shamy switching to heal duty)

We killed both Anatheron and Teron gorefiend with 7 healers, 2 priest, 2 shammy-3 shammy, 2 paladin and a druid when not 3 shammy.

We had our first attempts on ROS, 53% phase3 in 3 attempts with 7 healers so I don't think we'll be adding more healers to that fight. We do though have an ele-shaman in raid that can help heal, and next week we will be going back to two shadowpriests instead of 1 since he's back from haiatus.

Looking forward to learning Kaz'rogal, what is a bit annoying is that we had a couple tries on Kaz'rogal trash in Hordecamp and it seemed harder than both Supremus, akama and even teron. But I'm looking more forward to that than gurtogg which I feel will become a major cockblock for us, time will tell.

I think we use an unconventional approach on this encounter. As someone mentioned we have primarily melee DPS on Anetheron and ranged on infernals. Ranged do DPS on the boss whenever there are no infernals up, but they are told to take care of themselves (they wear a bit SR and step OOR each time they take a CS). This leaves us with 4 healers on MT/melee and 2 on OT/ranged. MT healers also wear SR gear.

That's not very unconventional unless there is something hidden in your post I'm failing to grasp. It is how we learned the encounter aswell though we had 7 healers. We still have ranged on infernals bandage, hs etc and generally manage their own HP.

Our first RoS kill was with 24 in raid and 8 healers. I'm not sure why everyone say that this is huge dps race. Phase went much better for us with additional healer.

We found that 8 healers was a much more stable phase 3 also. Dead dps is a wasted spot, adding an extra 1-2 healers helped us keep 20-25 people alive til ROS was dead and a much cleaner kill.

You can actually pretty much substitute healers for shadowpriests in p.3, our ve healing at that point is totally unreal. I bet that if you had 5 spriests you wouldn't need more than 3-4 healers, mostly for the mt at early p.3.

I'm saying more on the end of 9 healers just really seems like overkill for RoS but each to their own I suppose. Different things are going to work with different guilds, so there is no perfect right number as some guilds have stronger healers then others allowing them to comfortably do things with less.

@ AriasImmortal: That's pretty crazy man! You guys must have had some tip top DPS to learn RoS with 9 healers. I couldn't imagine learning it with 9, we could do it now easily because we've been farming for a while and our DPS geared out, but learning with 9 would have been rough. I guess it just goes to show that there's no magical number for every encounter, take what works best for you.

We one nighted pre-nerf Shaz with 7 healers, so I guess we're just one of those guilds that prefers to roll light on healing.
For our typical BT/Hyjal clearing I'll bring 7 healers for everything up to BB, swap in one more healer for BB>Illidan making it 8 to clear the zone. Hyjal we do with 7 all the way through, possibly swapping in one more shaman for archimonde if the stars align and we somehow don't have 5 in the raid (having 6 raiding shaman is amazing, our typical raid comp includes 5 shaman in the raid).

In the end of the day though, It's not a bad idea that when trying to learn the majority of BT/Hyjal content, if you have the extra healers handy, it's generally always a good idea to bring them in and if you find you need more DPS then sub out healing as you need. Aside from RoS nothing has a very steep dps requirement.

Yeah and then between seal of light and leader of the pack, meele will heal themselves for a lot here too.