Resto shaman have riptide, earth shield and you have 3/4 healing stream totems, depending if you drop a mana spring totem.

If you cast riptide and earthshield at the beginning of each pull, you don't have to do much healing beyond that so the resto can contribute to dps with lightning bolt whilst regaining mana if you spec for it.

Oh and PTR 4.10 says healing buff to resto shaman