Offensive Heroes and Healing

Let's say I give a hero three offensive skills (searing flames, glowing gaze, etc) and three Heal Other spells (Heal Other, Jameis Gaze, Dwaynas Kiss). The Offensive skills are on the left part of the bar.

Will the hero switch to healing when the party health is low? Will he ever heal? Just wondering...

You might as well just disable the healing skills and then use them yourself. I findthat they won't use the skills to the right unless the ones on the left are recharging