User blog comment:Spartian300/Why Titans are the best class/@comment-32856285-20140918210056/@comment-24057866-20140929160551

Sunsingers don't heal anyone any more than any other class does. The Radiance grenade and melee cooldown buffs can be modified to extend to nearby allies, but that's it.

If anything Defender is more of a healer class, since Ward of Dawn can be modified to grant a shield to any ally who steps in it.