Before I had the gear to outgear him and just nuke, it was mostly spread (it's a low radius aoe) and self heal (all shaman were elemental, if I had a resto I'd do dedicated healing instead). I've always used mana totems instead, as long as I have mana I can heal myself. Refresh shield very important too.
I also taunt the boss as much as possible so most damage goes to tank.

He was never a real problem this way.