At level 27 I have:
http://www.dbocom.com/skills.php?id=39
heals around 300 over 7 seconds.
cooldown: 8 sec
http://www.dbocom.com/skills.php?id=28
heals around 450
cooldown: 20sec
thats the 2 single target heals, now AOE:
http://www.dbocom.com/skills.php?id=35
heals around 400 everyone in some area
cooldown 14sec
http://www.dbocom.com/skills.php?id=36
heals something like 400 over 7-8sec
cooldown 10sec
if you don't know how long is 14 seconds, get a clock, time it.
ooh, see? I can't do **** if you pull 5 mobs, that includes the ones hitting myself
and that's about it. if you pull 5 mobs, don't have tanking skills, you will get everyone dead and its NOT A MANA ISSUE ITS A COOLDOWN ISSUE.
learn to pull or to keep your mouth shut. or at least apologize to your party.