When you cast Healing Wave, Greater Healing Wave, Healing Surge, or Chain Heal, your Healing Rain's duration is increased by 4.00 sec.
When you cast Lightning Bolt, Chain Lightning, Earth Shock, or use Stormstrike, your Healing Rain's duration is increased by 4.00 sec.
This cannot cause Healing Rain to last longer than 40 sec.
Conductivity is a passive shaman talent available at level 75.
Patch 5.4.0 (10-Sep-2013) Conductivity has been redesigned.
Patch 5.2.0 (5-Mar-2013): Conductivity no longer requires that the target be within the area of effect of Healing Rain.; Conductivity now shares 30% (was 20%) of the healing received from Healing Wave, Greater Healing Wave, or Healing Surge.